US Call Sign Information
United States Call sign information
The terms of 1 by 2, 2 by 1, 2 by 2, 1 by 3, and 2 by 3 are talking about the positioning of letters in the call sign as with reference to the regional number.
The regional number separates the 2 sets of letters.
Geographical Area for the region numbers.
1 -- CT, ME, MA, NH, RI, and VT
2 -- NJ and NY
3 -- DE, DC, MD, and PA
4 -- AL, FL, GA, KY, NC, SC, TN, and VA
5 -- AR, LA, MS, NM, OK, and TX
6 -- CA
7 -- AZ, ID, MT, NV, OR, UT, WA, and WY
8 -- MI, OH, and WV
9 -- IL, IN and WI
0 -- CO, IA, KS, MN, NE, MO, ND, and SD