| Radio Callsign as of: | Rig. | Name of vessel. | Signal letters. | |||
|---|---|---|---|---|---|---|
| 6/30/1911 | 1/1/1912 | 6/30/1912 | 7/1/1913 | |||
| KD | KD | WNO | WNO | St. s. | A. G. Lindsay. | ---- |
| A2 | A2 | WWO | WWO | St. s. | Acapulco. | JMBP |
| UV | UV | KUV | KUV | St. s. | Admiral Dewey. | KNRS |
| UW | UW | KUW | WAF | St. s. | Admiral Farragut. | KNSW |
| AS | AS | WAS | WAS | St. s. | Admiral Sampson. | KNSB |
| UG | UG | KUX | KUX | St. s. | Admiral Schley. | KNSQ |
| MV | MV | KMV | KMV | St. s. | Advance. | KBDJ |
| AB | AB | --- | --- | St. s. | Alabama. | ---- |
| XG | XG | KSX | KSX | St. s. | Alabama. | ---- |
| HD | HD | WAA | WAA | St. s. | Alameda. | KBML |
| AJ | AJ | KAJ | KEJ | St. s. | Alamo. | KBQR |
| VG | VG | KVG | KVG | St. s. | Algonquin. | KHNP |
| -- | -- | WNK | WNK | St. s. | Al-Ki. | KCJT |
| Q5 | Q5 | KQA | KQA | St. s. | Alleghany. | JVMG |
| MA | MA | KMA | KMA | St. s. | Allianca. | KDNC |
| BW | BW | WRV | WRV | St. s. | Alliance. | KMVD |
| -- | -- | KYH | KYH | St. y. | Aloha. | LBKS |
| MAV | MAV | --- | --- | St. s. | Alva. | ---- |
| AM | AM | KNZ | KNZ | St. p. | America. | ---- |
| MS | MS | KMS | KMS | St. s. | Ancon. | KRNT |
| A3 | A3 | --- | WDN | St. s. | Ann Arbor No. 3. | ---- |
| A4 | A4 | --- | WDO | St. s. | Ann Arbor No. 4. | ---- |
| A5 | A5 | --- | WDP | St. s. | Ann Arbor No. 5. | ---- |
| KA | KA | KKA | KKA | St. s. | Antilles. | KWBN |
| VA | VA | KVA | KVA | St. s. | Apache. | KQVN |
| VB | VB | KVB | KVB | St. s. | Arapahoe. | KRBV |
| UV | UV | WTB | WTB | St. s. | Argyll. | KQGP |
| HC | HC | --- | WFG | St. s. | Arizona. | ---- |
| KY | KY | --- | --- | St. s. | Arundell. | ---- |
| GS | GS | KTO | KTO | St. s. | Astral. | KSRN |
| GM | GM | WTX | WTX | St. s. | Asuncion. | KQLW |
| -- | MAT | KYA | KYA | St. y. | Atalanta. | KVQL |
| GN | GN | WTT | WTT | St. s. | Atlas. | KNTW |
| DAB | DAB | --- | --- | St. s. | Augustus B. Wolvin. | ---- |
| X2 | X2 | WWQ | WWQ | St. s. | Aztec. | KPWD |
| -- | -- | KCZ | KDX | St. s. | Bayamon. | LCJF |
| WD | WD | WWD | WWD | St. s. | Bear. | LBHM |
| WB | WB | WWB | WWB | St. s. | Beaver. | LBHN |
| -- | RD | KRD | KRD | St. s. | Belfast. | LBCQ |
| QH | QH | KQB | KQB | St. s. | Berkshire. | JVNR |
| P9 | P9 | WBR | WBR | St. s. | Bertha. | KPCW |
| -- | -- | KCW | KDW | St. s. | Borinquen. | LCFS |
| BN | BN | KXA | KXA | St. s. | Boston. | KTDG |
| AZ | AZ | KAZ | KEZ | St. s. | Brazos. | KWJN |
| EK | EK | WBK | WBK | St. s. | Breakwater. | JTRS |
| -- | -- | KOS | KOS | St. s. | Brunswick. | JSHT |
| P7 | P7 | WAB | WAB | St. s. | Buckman. | KRGC |
| JB | JB | KJB | KJB | St. s. | Bunker Hill. | KWDT |
| BV | BV | WBV | WBV | St. s. | Cabrillo. | KTFD |
| -- | -- | WNB | --- | St. s. | California. | ---- |
| RN | RN | KRN | KRN | St. s. | Calvin Austin. | KSNB |
| RC | RC | KRC | KRC | St. s. | Camden. | KWCG |
| -- | -- | WQC | WQC | St. s. | Camino. | LCND |
| GB | GB | WTV | WTV | St. s. | Captain A. F. Lucas. | KTNW |
| DB | DB | KDB | KDB | St. s. | Caracas. | KGMT |
| NC | NC | WNC | WNC | St. s. | Carlos. | KWRT |
| NC | NC | --- | WFE | St. s. | Carolina. | ---- |
| CB | CB | KCB | KGB | St. s. | Carolina. | KMTB |
| -- | -- | KNF | KNF | St. s. | Carolyn. | LCMN |
| -- | -- | WTI | WTI | St. s. | Catania. | KNLC |
| -- | SD | WSN | WSN | St. s. | Centralia. | KSFD |
| KC | KC | KKC | KKC | St. s. | Chalmette. | JTNB |
| NV | NV | --- | --- | St. s. | Charles Nelson. | KNLF |
| NA | NA | WSH | WSH | St. s. | Chehalis. | KQSP |
| VK | VK | KVK | KVK | St. s. | Cherokee. | KDNP |
| HN | HN | KXQ | KXQ | St. s. | Chester W. Chapin. | ---- |
| HO | HO | --- | WFI | St. p. | Chicago. | ---- |
| AB | AB | WAC | WAC | St. s. | Chicago. | ---- |
| MCI | MCI | --- | --- | St. s. | Chili. | ---- |
| WA | WA | WWA | WWA | St. s. | China. | KNLT |
| BH | BH | WBH | WBH | St. s. | Chippewa. | KVRW |
| KC | KC | --- | WFJ | St. s. | Christopher Columbus. | ---- |
| FB | FB | KFB | KFB | St. s. | City of Atlanta. | KTFN |
| FJ | FJ | KFJ | KFJ | St. s. | City of Augusta. | JVBF |
| XO | XO | KRY | KRY | St. s. | City of Baltimore. | LBTG |
| AQ | AQ | --- | WDV | *St. p. | City of Benton Harbor. | ---- |
| CF | CF | --- | WFQ | St. p. | City of Buffalo. | ---- |
| PQ | PQ | --- | WDT | St. s. | City of Chicago. | ---- |
| CO | CO | --- | WEA | St. p. | City of Cleveland. | ---- |
| FA | FA | KFA | KFA | St. s. | City of Columbus. | KTBS |
| CD | CD | --- | WEC | St. p. | City of Detroit. | ---- |
| CP | CP | --- | WFP | St. s. | City of Erie. | ---- |
| GF | GF | KTQ | KTQ | St. s. | City of Everett. | KMCQ |
| WE | WE | KXB | KXB | St. s. | City of Lowell. | KLWV |
| FC | FC | KFC | KFC | St. s. | City of Macon. | KSLD |
| FD | FD | KFD | KFD | St. s. | City of Memphis. | KRPQ |
| FY | FY | KFY | KFY | St. s. | City of Montgomery. | LBKQ |
| XN | XN | KRZ | KRZ | St. s. | City of Norfolk. | LBTM |
| M2 | M2 | WWP | WWP | St. s. | City of Panama. | JNTF |
| R2 | R2 | WWF | WWF | St. s. | City of Para. | JSWK |
| GQ | GQ | WGQ | WGQ | St. s. | City of Puebla. | JVRN |
| FK | FH | KFK | KFK | St. s. | City of Savannah. | KWGQ |
| GA | GA | WGA | WGA | St. s. | City of Seattle. | KHLJ |
| BX | BX | --- | WDI | St. s. | City of South Haven. | ---- |
| CG | CG | --- | WEG | St. p. | City of St. Ignace. | ---- |
| FX | FX | KFX | KFX | St. s. | City of St. Louis. | LBKR |
| S2 | S2 | WWG | WWG | St. s. | City of Sydney. | JRMP |
| -- | Q | KXL | KXL | St. p. | City of Taunton. | --- |
| GY | GY | WGY | WGY | Ga. s. | City of Topeka. | KCPL |
| WQ | WQ | --- | --- | St. s. | City of Traverse. | ---- |
| CA | CA | KCA | KGA | St. s. | Coamo. | KQGB |
| P4 | P4 | WTS | WTS | St. s. | Col. E. L. Drake. | KSJN |
| MX | MX | KMX | KMX | St. s. | Colon. | KPBW |
| AF | AF | KAF | --- | St. s. | Colorado. | JTKC |
| XC | XC | KRO | KRO | St. s. | Columbia. | KWBD |
| -- | -- | WHC | WHC | St. s. | Columbia. | LCMQ |
| AM | AM | KAM | KEM | St. s. | Comal. | KDFC |
| VC | VC | KVC | KVC | St. s. | Comanche. | KMLR |
| CW | CW | KXC | KXC | St. p. | Commonwealth. | KWPJ |
| KD | KD | KKD | KKD | St. s. | Comus. | KPSB |
| AC | AC | KAC | KEC | St. s. | Concho. | KJHD |
| AF | AF | KNC | KNC | St. s. | Concord. | KJCV |
| -- | -- | KXO | KXO | St. p. | Connecticut. | ---- |
| -- | -- | WAR | WAR | St. s. | Cordova. | LCHP |
| NR | NR | WSO | WSO | St. s. | Coronado. | KQHT |
| -- | -- | KYC | KYC | St. y. | Corsair. | KNWS |
| HO | HO | WNN | WNN | St. s. | Corwin. | ---- |
| KR | KR | KKR | KKR | St. s. | Creole. | KWDR |
| QZ | QZ | KQC | KQC | St. s. | Cretan. | JWBH |
| MD | MD | KMD | KMD | St. s. | Cristobal. | KRSV |
| -- | -- | KUC | KUC | St. s. | Cuba. | KQSM |
| GK | GC | --- | WGK | St. s. | Curaçao. | KMNJ |
| CV | CV | KNU | KNU | St. s. | Currier. | LBRF |
| DGK | DGK | --- | --- | St. s. | D. G. Kerr. | ---- |
| -- | -- | KTW | KTW | Sch. | Delaware Sun. | KSRL |
| -- | -- | WGD | WGD | St. s. | Delhi. | KVPJ |
| AD | AD | KAD | KED | St. s. | Denver. | KRFN |
| NL | NL | WNL | WNL | Bk. | Diamond Head. | KPWH |
| -- | -- | WAO | WAO | St. s. | Dirigo. | KNGW |
| AU | AU | WAU | WAU | St. s. | Dolphin. | KLHD |
| AT | AT | WAH | WAH | St. s. | Dora. | ---- |
| QD | QD | KQD | KQD | St. s. | Dorchester. | KGDQ |
| CD | CD | KNA | KNA | St. s. | Dorothy Bradford. | KGPQ |
| CS | OS | --- | WEE | St. p. | Eastern States. | ---- |
| ES | ES | --- | --- | St. s. | Easton. | ---- |
| -- | -- | WAE | WAE | St. s. | Edith. | KQNL |
| -- | -- | KKL | KKL | St. s. | El Alba. | KRLC |
| -- | -- | KKT | KKT | St. s. | El Cid. | KPMH |
| -- | -- | KKY | KKY | St. s. | El Dia. | KRDQ |
| -- | -- | KKU | KKU | St. s. | El Mundo. | LBQK |
| -- | EN | KKN | KKN | St. s. | El Norte. | KPJC |
| -- | -- | KKX | KKX | St. s. | El Occidente. | LBRM |
| -- | -- | KKV | KKV | St. s. | El Oriente. | LBRC |
| -- | -- | KKZ | KKZ | St. s. | El Rio. | KPJW |
| -- | -- | KKS | KKS | St. s. | El Siglo. | KRHL |
| -- | -- | KKB | KKB | St. s. | El Sol. | LBPK |
| -- | -- | KKQ | KKQ | St. s. | El Sud. | KPGH |
| -- | -- | KKW | KKW | St. s. | El Valle. | KQTV |
| ME | ME | --- | --- | St. y. | Electra. | KCMN |
| -- | -- | KVU | --- | St. s. | Elmer A. Keeler. | KTMR |
| -- | -- | KTK | KTK | St. s. | Elsegundo. | ---- |
| P1 | P1 | WMN | WMN | St. s. | Enterprise. | KQRD |
| -- | -- | KTM | KTM | St. s. | Eocene. | LCFV |
| WZ | WZ | KWZ | KWZ | St. s. | Esperanza. | KQRN |
| QE | QE | KQE | KQE | St. s. | Essex. | KJLW |
| -- | -- | KNE | KNE | St. s. | Evelyn. | LCKQ |
| KO | KO | KKO | KKO | St. s. | Excelsior. | JWNR |
| SK | SK | WRU | WRW | St. s. | F. A. Kilburn. | KSVR |
| FBS | FBS | --- | --- | St. s. | F. B. Squire. | ---- |
| GF | GF | WRK | WRK | St. s. | Falcon. | KWPF |
| ID | ID | WSU | --- | St. s. | Fearless. | ---- |
| -- | -- | WPF | --- | St. s. | Fearless. | ---- |
| RF | RF | WRF | WRF | St. s. | Fifield. | KWQP |
| -- | MTK | KYF | KYF | St. y. | Florence. | KRMT |
| XF | XF | KSY | KSY | St. s. | Florida. | KWJF |
| ST | ST | --- | --- | St. s. | Fort Bragg. | LBQP |
| -- | -- | WSB | WSB | St. s. | Francis H. Leggett. | KSHC |
| DAN | DAN | --- | --- | St. s. | Frank H. Peavey. | ---- |
| DHN | DHN | --- | --- | St. s. | Frank T. Heffelfinger. | ---- |
| QK | QK | KQF | KQF | St. s. | Frederick. | JPRK |
| -- | -- | KFF | KFF | St. s. | Frieda. | ---- |
| DFB | DFB | --- | --- | St. s. | Frederick B. Wells. | ---- |
| AY | AY | WRT | WRT | St. s. | Geo. W. Elder. | JPHT |
| F2 | -- | WNG | WNG | St. s. | George W. Fenwick. | KWLS |
| DUF | DUF | --- | --- | St. s. | George W. Peavey. | ---- |
| GC | GC | --- | WFA | St. s. | Georgia. | ---- |
| -- | -- | WBZ | WBZ | Bge. | Glory of the Seas. | ---- |
| QY | QY | KQG | KQG | St. s. | Gloucester. | KLTC |
| B3 | B3 | WPG | WPG | St. s. | Goliah. | KWLP |
| GV | GV | WGV | WGR | St. s. | Governor. | KWFN |
| RB | RB | KRB | KRB | St. s. | Governor Cobb. | KVQJ |
| RV | RV | KRV | KRV | St. s. | Governor Dingley. | KPLG |
| HV | HV | --- | --- | St. s. | Grant. | KVTL |
| -- | -- | KCV | KDV | St. s. | Grayson. | LCFT |
| QG | QG | KQR | KQR | St. s. | Grecian. | KPSF |
| -- | -- | WQG | WQG | St. s. | Greenwood. | ---- |
| -- | -- | KTG | KTG | St. s. | Gulfoil. | LCNR |
| GY | CY | --- | --- | St. s. | Gypsy III. | ---- |
| DBO | DBO | --- | --- | St. s. | H. P. Bope. | ---- |
| OA | OA | KOA | KOA | St. s. | Hamilton. | KNWT |
| HN | HN | WHN | WHN | St. s. | Hanalei. | KQNW |
| -- | -- | KCT | KDT | St. s. | Harry Luckenbach. | KPQT |
| RH | RH | WRH | WRH | St. s. | Harvard. | KWGD |
| WH | WH | KWH | KWH | St. s. | Havana. | KVST |
| UHF | UHF | KFH | KFH | St. s. | Herman Frasch. | LBJP |
| BP | BP | WBP | WBP | St. s. | Hermosa. | KRPV |
| P2 | P2 | WMM | WMM | St. s. | Hilonian. | KVFD |
| NQ | NQ | --- | WDW | St. s. | Holland. | ---- |
| NW | NW | WKH | WKH | St. s. | Honolulan. | LBQT |
| QJ | QJ | KQH | KQH | St. s. | Howard. | KMHN |
| HX | HX | WHX | WHX | St. s. | Humboldt. | KMWP |
| VH | VH | KVH | KVH | St. s. | Huron. | KSDT |
| BT | BT | WMK | WMK | St. s. | Hyades. | KPVW |
| UHG | UHG | KFI | KFI | *Sch. | I. D. Fletcher. | LBFT |
| RQ | RQ | KRQ | KRQ | St. s. | I. J. Merritt. | KPML |
| YN | YN | --- | WCZ | St. s. | Illinois. | ---- |
| Q1 | Q1 | KQI | KQI | St. s. | Indian. | KGVF |
| SC | SC | --- | WFC | St. s. | Indiana. | ---- |
| DC | DC | --- | WFD | St. s. | Iowa. | ---- |
| VF | VF | KVF | KVF | St. s. | Iroquois. | KGCN |
| BG | BG | WBG | WBG | St. s. | Iroquois. | KVSB |
| QI | QI | KQU | KQU | St. s. | Itasca. | JKTD |
| NU | NU | WTK | WTK | St. s. | J. A. Chanslor. | LBJN |
| SC | SC | WSC | WRC | St. s. | J. B. Stetson. | KVDP |
| QF | QF | KTF | KTF | St. s. | J. M. Guffey. | KRNL |
| DJC | DJC | --- | --- | St. s. | James C. Wallace. | ---- |
| DAM | DAM | --- | --- | St. s. | James H. Hoyt. | ---- |
| DJR | DJR | --- | --- | St. s. | James H. Reed. | ---- |
| OC | OC | KOC | KOC | St. s. | Jamestown. | KLVJ |
| OD | OD | KOD | KOD | St. s. | Jefferson. | KPCM |
| HM | HM | WAJ | WAJ | St. s. | Jefferson. | KSTP |
| RE | -- | --- | --- | Bkn. | John S. Emery. | KGTS |
| -- | -- | WSJ | WSJ | St. s. | John A. Hooper. | ---- |
| BI | BI | WPZ | WPZ | Ga. s. | Joseph Pulizer. | ---- |
| JO | -- | --- | --- | St. s. | Josephine. | ---- |
| -- | -- | KCU | --- | St. s. | Julia Luckenbach. | KSCP |
| QN | QN | KQJ | KQJ | St. s. | Juniata. | KNFH |
| AX | AX | WWS | WWS | St. s. | Kansas City. | KGRV |
| --- | MTJ | KYR | KYR | Sch. y. | Karina. | LBVN |
| QL | QL | KQK | KQK | St. s. | Kershaw. | KNWB |
| DH | DH | WPK | WPK | St. s. | Kingfisher. | KRWC |
| YA | KSM | KYK | KYK | St. y. | Kismet. | KRTD |
| NI | NI | WSX | WSX | St. s. | Klamath. | LBGP |
| WK | WK | WWK | WWK | St. s. | Korea. | KRNC |
| NS | NS | WNS | WNS | St. s. | Kvichak. | KPSM |
| AP | AP | KAP | KEP | St. s. | Lampasas. | KBNT |
| UD | UD | WTC | WTC | St. s. | Lansing. | KSVF |
| QA | QA | KTA | KTA | St. s. | Larimer. | KSML |
| AI | AI | WAI | WAI | St. s. | Latouche. | LBQM |
| --- | L2 | WNI | WNI | St. s. | Leelanaw. | KNGR |
| --- | --- | WNH | WNH | St. s. | Lewis Luckenbach. | KSTB |
| QX | QX | KQL | KQL | St. s. | Lexington. | JSPT |
| AS | AS | KNB | KNB | St. s. | Lexington. | KJBV |
| QO | QO | KTD | KTD | St. s. | Ligonier. | KSLC |
| XQ | XQ | KRL | KRL | St. p. | Louise. | JCMW |
| IU | IN | KNQ | KNQ | St. s. | Lucy Neff. | ---- |
| U2 | U2 | WML | WML | St. s. | Lurline. | KWMR |
| --- | MGB | KYL | KYL | St. y. | Lysistrata. | ---- |
| P3 | NY | --- | --- | St. s. | M. F. Plant. | KNMV |
| HW | HW | WHW | WHW | St. s. | Mackinaw. | KLBC |
| OG | OG | KOG | KOG | St. s. | Madison. | LBSP |
| MA | MA | KXD | KXD | St. s. | Maine. | KLDB |
| WE | WE | WWE | WWE | St. s. | Manchuria. | KSWC |
| MN | MN | --- | WFW | St. s. | Manitou. | ---- |
| DM | DM | KDM | KDM | St. s. | Maracaibo. | KPLQ |
| HK | HK | WHK | WHK | St. s. | Mariposa. | KBGT |
| OW | OW | KOW | KOW | St. s. | Mascotte. | KDGQ |
| JM | JM | KJM | KJM | St. s. | Massachusetts. | KWBM |
| MW | MW | --- | --- | Ga. y. | Maurence. | ---- |
| GH | GH | WTW | WTW | St. s. | Maverick. | KHBS |
| QM | QM | KQM | KQM | St. s. | Merrimack. | JTMH |
| WX | WX | KWX | KWX | St. s. | Mexico. | KVJR |
| OZ | OZ | KOZ | KOZ | St. s. | Miami. | KNGB |
| MK | MK | KNM | KNM | St. s. | Millinocket. | LBNM |
| PJ | -- | KRR | KRR | St. s. | Mills. | KQSR |
| MIN | MIN | --- | WEK | St. s. | Minnesota. | ---- |
| MI | MI | WMI | WMI | St. s. | Minnesota. | KTDS |
| HN | HN | --- | WFX | St. s. | Missouri. | ---- |
| MK | MO | KXE | KXE | St. s. | Mohawk. | KMQC |
| VM | VM | KVM | KVM | St. s. | Mohawk. | KWRL |
| -- | MQ | KXM | KXM | St. s. | Mohegan. | KMRC |
| KM | KM | KKM | KKM | St. s. | Momus. | KVRL |
| WN | WN | WWN | WWN | St. s. | Mongolia. | KSTH |
| OM | OM | KOM | KOM | St. s. | Monroe. | KSGN |
| MG | MG | KNT | KNT | St. p. | Montauk. | ---- |
| WY | WY | KWY | KWY | St. s. | Monterey. | KQVM |
| WC | WC | KWC | KWC | St. s. | Morro Castle. | KQFG |
| FP | FP | KFP | KFP | St. s. | Nacoochee. | JWVM |
| BO | BQ | WBO | WBO | St. s. | Nann Smith. | KWLJ |
| QU | QU | KQN | KQN | St. s. | Nantucket. | KPBJ |
| G2 | G2 | WNJ | WNJ | St. s. | Navajo. | LBVC |
| -- | -- | KNL | KNL | St. s. | Nelson. | ---- |
| NS | NS | KXF | KXF | St. s. | New Hampshire. | KLFC |
| -- | MV | KXN | KXN | St. s. | New Haven. | KWDL |
| NJ | NJ | KNJ | KNJ | St. s. | New Jersey. | KSCW |
| Q9 | Q9 | KQV | KQV | St. s. | New Orleans. | JLSC |
| -- | N2 | WWH | WWH | St. s. | Newport. | JTVP |
| MNK | MNK | KSN | KSN | St. s. | New York. | KLPB |
| NK | NK | KNK | KNK | St. s. | New York. | KNBM |
| N2 | N2 | --- | WWH | St. s. | Newport. | JTVP |
| MAN | MAN | KYN | KYN | St. y. | Niagara. | KNHR |
| MJS | MJS | KYO | KYO | St. y. | Noma. | KRVB |
| SN | SN | WRN | WRN | St. s. | Nome City. | KPVF |
| NX | NX | WNX | WNX | St. s. | Northland. | KTDR |
| ND | ND | --- | WCN | St. s. | North Land. | ---- |
| JD | JD | KJD | KJD | St. s. | North Land. | LBJT |
| JS | JS | KJS | KJS | St. s. | North Star. | KQVW |
| AN | AN | WAN | WAN | St. s. | Northwestern. | KGVM |
| SG | SG | WSG | WSG | St. s. | Norwood. | KTLB |
| AH | AH | KAH | KEH | St. s. | Nueces. | KDSM |
| NE | NE | WNE | WNE | St. s. | Nushagak. | KTCB |
| QB | QB | KTB | KTB | St. s. | Oklahoma. | KWNH |
| JO | JO | KJO | KJO | St. s. | Old Colony. | KWHQ |
| UK | UK | WTD | WTD | St. s. | Oleum. | KQMJ |
| OV | OV | KOV | KOV | St. s. | Olivette. | KDQR |
| --- | --- | WPX | WPX | St. s. | Oneonta. | ---- |
| Q2 | Q2 | KQO | KQO | St. s. | Ontario. | KTGJ |
| MH | MH | KMH | KMH | St. s. | Panama. | KNTV |
| YA | YA | KTT | KTT | St. s. | Paraguay. | KQLB |
| Q3 | Q3 | KQP | KQP | St. s. | Parthian. | KDVH |
| V2 | V2 | WWI | WWI | St. s. | Pennsylvania. | JMQL |
| -- | NK | KXP | KXP | St. s. | Pequonnock. | KVGT |
| -- | -- | KTN | KTN | St. s. | Perfection. | LCBV |
| 15 | 15 | --- | WDA | St. s. | Pere Marquette. | ---- |
| 17 | 17 | --- | WDC | St. s. | Pere Marquette 17. | ---- |
| 18 | 18 | --- | WDD | St. s. | Pere Marquette 18. | ---- |
| 19 | 19 | --- | WDB | St. s. | Pere Marquette 19. | ---- |
| 20 | 20 | --- | WDE | St. s. | Pere Marquette 20. | ---- |
| QR | QR | KQX | KQX | St. s. | Persian. | JWNG |
| B2 | B2 | WWJ | WWJ | St. s. | Peru. | KLJD |
| DA | DA | KDA | KDA | St. s. | Philadelphia. | KCWD |
| MPH | MPH | KSM | KSM | St. s. | Philadelphia. | KLPC |
| GM | GM | KXG | KXG | St. p. | Pilgrim. | KBDV |
| I2 | I2 | WNP | WNP | St. s. | Pleiades. | KPSL |
| HY | HY | KXH | KXH | St. p. | Plymouth. | KHQS |
| CP | CP | KCP | KGP | St. s. | Ponce. | KPJD |
| -- | P3 | WNV | WNV | St. s. | Portland. | KQFP |
| QP | QP | KQY | KQY | St. s. | Powhatan. | KLVM |
| GW | GW | WGW | WGP | St. s. | President. | KVTF |
| OB | OB | KOB | KOB | St. s. | Princess Anne. | KNBV |
| CA | CA | KXI | KXI | St. p. | Priscilla. | KLWJ |
| KP | KP | KKP | KKP | St. s. | Proteus. | KPTR |
| PV | PV | KXJ | KXJ | St. p. | Providence. | KTQP |
| SQ | SQ | --- | WDU | St. s. | Puritan. | ---- |
| RN | RN | KXK | KXK | St. p. | Puritan. | KGJQ |
| QV | QV | KQQ | KQQ | St. s. | Quantico. | JWRL |
| GX | GX | WGX | WGX | St. s. | Queen. | JVWG |
| GO | GO | --- | --- | St. s. | Ramona. | KRWP |
| SU | SU | WBM | WBM | St. s. | Redondo. | KRPW |
| --- | RX | KVZ | KVZ | St. s. | Relay. | ---- |
| RJ | RJ | KRJ | KRJ | St. s. | Relief. | KWBH |
| IB | IB | --- | --- | St. s. | Resolute. | ---- |
| -- | -- | WSR | WSR | Shp. | Reuce. | JVPM |
| -- | RP | KXR | KXR | St. s. | Richard Peck. | KLGF |
| AG | AG | KAG | KEG | St. s. | Rio Grande. | JSDV |
| AM | AM | WRM | WRM | St. s. | Riverside. | KWPM |
| AQ | AQ | WRR | WRR | St. s. | Roanoke. | JVTN |
| UN | UN | WTE | WTE | St. s. | Roma. | KRTC |
| RK | RK | --- | --- | St. s. | Roosevelt. | KTWC |
| H2 | H2 | WWR | WWR | St. s. | Rose City. | KGTR |
| BM | BM | WTL | --- | St. s. | Rosecrans. | KNTC |
| CD | GD | WTU | WTU | *Sch. | S. O. Co. No. 91. | KSBP |
| P5 | P5 | WTY | WTY | *Sch. | S. O. Co. No. 93. | KSCL |
| GK | GH | KTP | KTP | *Sch. | S. O. Co. No. 94. | KTBG |
| GP | GP | WTZ | WTZ | *Sch. | S. O. Co. No. 95. | KTDJ |
| YA | YA | KCS | KDS | St. s. | S. V. Luckenbach. | KVCF |
| AB | AB | KAB | KEB | St. s. | Sabine. | KGNS |
| NY | NY | WNY | WNY | St. s. | St. Helens. | KWGT |
| MSL | MSL | KSL | KSL | St. s. | St. Louis. | HSPT |
| -- | -- | WSS | WSS | Shp. | St. Nicholas. | JHDG |
| MSP | MSP | KSO | KSO | St. s. | St. Paul. | HPTS |
| AS | AS | KAS | KES | St. s. | San Jacinto. | KSRV |
| O2 | O2 | WWL | WWL | St. s. | San Jose. | JWDV |
| CJ | CJ | KCJ | KGJ | St. s. | San Juan. | KPNW |
| J2 | J2 | WWM | WWM | St. s. | San Juan. | JWHL |
| AK | AK | KAK | KEK | St. s. | San Marcos. | JVSF |
| -- | -- | WNW | WNW | St. s. | San Ramon. | ---- |
| -- | -- | WAL | WAL | St. s. | Santa Ana. | KPRF |
| AK | AK | WRS | WRS | St. s. | Santa Clara. | KQGC |
| KS | KS | WPA | WPA | St. s. | Santa Cruz. | JBWH |
| UM | UM | WTF | WTF | St. s. | Santa Maria. | KRJH |
| US | US | WTG | WTG | St. s. | Santa Rita. | KRPL |
| GI | -- | --- | WGN | St. s. | Santa Rosa. | KCDR |
| WS | WS | KWS | KWS | St. s. | Saratoga. | KWDB |
| SAT | SAT | --- | --- | St. s. | Satellite. | ---- |
| HS | HS | KRS | KRS | St. s. | Savage. | KPNM |
| -- | WY | KYS | KYS | Ga. y. | Sea Otter. | KWDQ |
| -- | -- | WSV | --- | St. s. | Sea Rover. | KSBH |
| WG | WG | KWG | KWG | St. s. | Seguranca. | KHLT |
| VJ | VJ | KVJ | KVJ | St. s. | Seminole. | KDNS |
| GS | GS | WGS | WGS | St. s. | Senator. | KNJF |
| AV | AV | WAV | WAV | St. s. | Seward. | KWHD |
| MC | MC | --- | --- | St. p. | Sheboygan. | ---- |
| QC | QC | KTC | KTC | *Sch. | Shenango. | KSLR |
| MD | MD | KNS | KNS | St. p. | Shinnecock. | ---- |
| WU | WU | WWU | WWU | St. s. | Siberia. | KRWG |
| SM | SM | WHJ | WHJ | St. s. | Sierra. | KQHP |
| Q4 | Q4 | KQS | KQS | St. s. | Somerset. | LBVG |
| -- | -- | WHI | WHM | St. s. | Sonoma. | KQLV |
| GE | GE | WGE | WGE | St. s. | Spokane. | KRLV |
| D2 | -- | WSD | WSD | St. s. | Stanley Dollar. | KWNM |
| GL | GL | WGL | WGL | St. s. | State of California. | JTGP |
| -- | -- | WPS | WPS | St. s. | Starr. | LCPF |
| UDS | UDS | KTU | KTU | St. s. | Sun. | KVWH |
| QS | QS | KQZ | KQZ | St. s. | Suwannee. | LBTH |
| SC | SC | KFT | KFT | St. s. | Tasco. | LBHT |
| MG | MG | WPE | WPE | St. s. | Tatoosh. | ---- |
| TN | TN | --- | --- | St. s. | Tennessee. | ---- |
| SV | SV | --- | WCT | St. s. | Theodore Roosevelt. | ---- |
| UDG | YD | KTV | KTV | St. s. | Toledo. | KSBT |
| Q7 | Q7 | KQT | KQT | St. s. | Tuscan. | KVSW |
| A3 | A3 | WPC | WPC | St. s. | Tyee. | ---- |
| IA | IA | WPB | WPB | St. s. | Tyee Junior. | ---- |
| GU | GU | WGU | WGU | St. s. | Umatilla. | JVKF |
| FA | SA | --- | --- | St. s. | United States. | ---- |
| UN | UN | --- | --- | Ga. y. | Unome. | ---- |
| -- | -- | WNZ | WNZ | St. s. | Vanguard. | KTMJ |
| -- | -- | WHL | WHL | St. s. | Ventura. | KQML |
| AD | AD | WAD | WAD | St. s. | Victoria. | KNRM |
| WV | WV | KWV | KWV | St. s. | Vigilancia. | KHSN |
| BC | BC | --- | WFH | St. s. | Virginia. | ---- |
| XH | XK | KSZ | KSZ | St. s. | Virginia. | ---- |
| BVA | BVA | --- | --- | St. y. | Virginia. | KPMW |
| BD | BD | WTM | WTM | St. s. | W. S. Porter. | KVRD |
| -- | -- | WPY | WPY | St. s. | Wallula. | ---- |
| DWA | DWA | --- | --- | St. s. | Ward Ames. | ---- |
| -- | -- | KYW | KYW | St. y. | Warrior. | KVHJ |
| UG | UG | WTH | WTH | St. s. | Washtenaw. | KMFJ |
| P8 | P8 | WAW | WAW | St. s. | Watson. | KRGF |
| WS | WS | --- | WED | St. p. | Western States. | ---- |
| UH | UN | WUH | WHT | St. s. | Whittier. | KSJL |
| NH | NR | WMO | WMO | St. s. | Wilhelmina. | LBHF |
| SW | SW | WSW | WSW | St. s. | Willamette. | LCDV |
| WB | WB | --- | --- | St. s. | William B. Davock. | ---- |
| NF | NF | WTN | WTN | St. s. | Wm. F. Herrin. | LBTD |
| MFD | CMI | --- | --- | St. s. | William H. Gratwick. | ---- |
| WHM | WHM | --- | --- | St. s. | William Henry Mack. | ---- |
| SND | SND | --- | WER | St. s. | William P. Snyder. | ---- |
| SNW | SNW | --- | WEU | St. s. | Wilpen. | ---- |
| -- | -- | WND | WND | St. s. | Windber. | KTWF |
| QW | QW | KTE | KTE | St. s. | Winifred. | KNRC |
| MJ | MJ | KNW | KNW | St. s. | Wyandotte. | ---- |
| -- | -- | KCY | KDY | St. s. | Yaguez. | LCJB |
| RY | RY | WRY | WRY | St. s. | Yale. | KWBR |
| SY | SY | WSY | WQY | St. s. | Yosemite. | KVFM |
| AG | AG | WAG | WMY | St. s. | Yucatan. | KHNF |
| -- | -- | WBS | WBQ | St. s. | Yukon. | KNMV |
| -- | -- | WPQ | WPQ | St. s. | Zapora. | ---- |
| MZA | MZA | KNR | KNR | St. s. | Zealandia. | KNLM |
| DZ | DZ | KDZ | KDZ | St. s. | Zulia. | KQWV |