FM Broadcast Zones

FCC divides the territory of the United States on three zones: I, I-A, and II.

The table below shows relation between FM station classes and FM broadcast zones.

FM Station Classes and FM Broadcast Zones
FM Station Class FM Broadcast Zone
A All
B1 I & I-A
B I & I-A
C3 II
C2 II
C1 II
C0 II
C II


To determine the zone of the particular coordinate, use FM Broadcast Zone Lookup by Coordinate .

FCC definition of the zones is based on NAD27:

Zone I

Zone I consists of that portion of the United States located within the confines of the following lines drawn on the United States Albers Equal Area Projection Map (based on standard parallels 291/2° and 451/2°):

  • Beginning at the most easterly point on the State boundary line between North Carolina and Virginia;
  • Thence in a straight line to a point on the VirginiaWest Virginia boundary line located at north latitude 37°49' and west longitude 80°12'30";
  • Thence westerly along the southern boundary lines of the States of West Virginia, Ohio, Indiana, and
  • Illinois to a point at the junction of the Illinois, Kentucky, and Missouri State boundary lines;
  • Thence northerly along the western boundary line of the State of Illinois to a point at the junction of the Illinois, Iowa, and Wisconsin State boundary lines;
  • Thence easterly along the northern State boundary line of Illinois to the 90th meridian;
  • Thence north along this meridian to the 43.5° parallel;
  • Thence east along this parallel to the United States-Canada border;
  • Thence southerly and following that border until it again intersects the 43.5° parallel;
  • Thence east along this parallel to the 71st meridian;
  • Thence in a straight line to the intersection of the 69th meridian and the 45th parallel;
  • Thence east along the 45th parallel to the Atlantic Ocean."


Zone I-A

Zone I-A consists of Puerto Rico, the Virgin Islands and that portion of the State of California which is located south of the 40th parallel.

Zone II

Zone II consists of Alaska, Hawaii and the rest of the United States which is not located in either Zone I or Zone I-A.

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