This is a list of radio and television broadcasting stations in the United States that are currently assigned three-letter

call sign In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique identifier for a transmitter station. A call sign can be formally assigne ...

Overview

In the United States, all radio and television broadcasting stations that are licensed by the

Federal Communications Commission The Federal Communications Commission (FCC) is an independent agency of the United States federal government that regulates communications by radio, television, wire, satellite, and cable across the United States. The FCC maintains jurisdiction ...

(FCC) are assigned official, and unique,

s. Organized broadcasting began in the U.S. in the early 1920s on the

AM band Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytim ...

— FM and television did not exist yet. Initially most broadcasting stations were assigned three-letter calls; however, a switch was made in April 1922 to primarily four-letter calls, after the number of stations had increased into the hundreds. For a few years thereafter a small number of new three-letter calls continued to be issued. Although most of the original three-letter calls were randomly assigned, these later calls were often specially requested to match station slogans. The last new three-letter call was assigned to station WIS (now WVOC) in Columbia, South Carolina on January 23, 1930. Since then, three-letter calls have only been assigned to stations, including FM (beginning in 1943) and TV (beginning in 1946),"Call Letter Style Adopted For Video"
''Broadcasting'', August 19, 1946, page 82. which are historically related to an AM station that was originally issued that call sign. This review only includes FCC-licensed stations. Not included are unlicensed operations, such as carrier current, cable TV, and Internet stations — for example, San Diego State University's "KCR" — which have adopted call-letter-like identifiers that are not officially issued by the FCC. Also not included are stations which use, as slogans, three-letter truncations of their official four-letter call signs; for example, the full call sign for radio station "KOH" in Reno, Nevada is actually KKOH, and "WTN" in Nashville, Tennessee is actually WWTN. In addition, stations which formerly had three letters but have since changed (such as Albuquerque, New Mexico's KKOB, formerly KOB) are not listed. , there are a total of 104 AM, FM and TV stations in the United States that are assigned three-letter call signs. This is divided between only 68 different three-letter calls, because in many cases the same call sign is used by more than one station, although a given call sign is never assigned to more than one AM, FM or TV station. These 68 different three-letter call signs are currently grouped as follows: *26 assigned only to an AM station *8 assigned only to an FM station *6 assigned only to a TV station *13 assigned to both an AM and an FM station *7 assigned to both an AM and a TV station *8 assigned to an AM, FM, and TV station

Assignments

Listed below are all the assignments :

AM radio (54 stations)

FM radio (29 stations)

In cases where an AM station exists with the same "base" call letters as an FM station, the FM station is required to include an "-FM"

suffix In linguistics, a suffix is an affix which is placed after the stem of a word. Common examples are case endings, which indicate the grammatical case of nouns, adjectives, and verb endings, which form the conjugation of verbs. Suffixes can carry ...

as part of its call sign. If no AM station is currently using the same base call sign, then the "-FM" suffix is optional.

Television (21 stations)

As with FM stations, if an AM station currently exists with the same "base" call, a TV station must include a suffix to differentiate itself, but this suffix is optional if no AM station currently exists. TV stations may select either "-TV" or "-DT" as their suffix.

Other stations of note

* WWV -

Fort Collins, Colorado Fort Collins is a home rule municipality that is the county seat and the most populous municipality of Larimer County, Colorado Larimer County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 359 ...

—

shortwave Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 me ...

time signal A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks; however, audi ...

data

radio clock A radio clock or radio-controlled clock (RCC), and often (incorrectly) referred to as an atomic clock is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time st ...

service operated by the

National Institute of Standards and Technology The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical sci ...

* KPH -

Bolinas, California Bolinas is an unincorporated coastal community and census-designated place in Marin County, California, United States. As of the 2020 census it had a population of 1,483. It is located on the California coast, approximately (straight line dist ...

—

morse code Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...

data service operated by radiomarine.org under the auspices of the

National Park Service The National Park Service (NPS) is an agency of the United States federal government within the U.S. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational propertie ...

References

External links

Media Bureau Call Sign Actions
(Monthly U.S. Federal Communications Commission Public Notices)

(FCC Licensing and Management System)