Whoopsies, it looks like you typed the letter O Instead of Zero.
Remember, Amateur Radio Callsigns consist of: a Prefix, a Single Number, & a Suffix.
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Learn More about Amateur Radio Callsign prefixes, numerals and suffixes below.
CALL SIGN PREFIX:
All U.S. amateur radio call signs contain one or two prefix letters beginning with K, N, W, AA-AL, KA- KZ, NA-NZ or WA-WZ. By agreement, these prefix letters are allocated to the United States by the International Telecommunication Union (ITU.)
CALL SIGN NUMERAL:
This digit is always a single numeral, 0 (zero) through 9 which usually indicates a geographical area within the continental (lower 48 contiguous) United States. For initially issued call signs, the mailing address of the licensee determines the numeral. Area digits (also between 0 and 9) of ham stations outside of the contiguous U.S. are arbitrarily assigned by the FCC. For example the area digit for American Samoa is the number 8.
The regions and numerals in a U.S. amateur station call sign are: (States are indicated as two letter state postal codes. The regions and call sign digits are the same for Regions 1 through 9.)
For stations located within the continental United States:
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
CALL SIGN SUFFIX:
The suffix can be one, two or three alphabet letters. Single-letter suffixes are all letters A through Z. Two-letter combinations are all between AA and ZZ. Three letter combinations are AAA through ZZZ. Some letter combinations are not used such as common Q-signals (example: QST), distress symbols (like SOS) and certain other combinations. The letter X also may not be the first of three suffix letters in Group D (two-by-three) call sign. By law, those suffixes go to Experimental rather than Amateur radio stations.
When all call signs within a block have been assigned, the next assignment is made from the next consecutive block within a group. When all blocks assigned to a group have been allocated, call signs from the next lower group are assigned. This system is known as the Sequential Amateur Station Call Sign System.
Thanks to W5YI for such a great explanation.
Learn more about Call Signs at their website.
Topics such as:
Types of radio stations in the Amateur Service
Operation in U.S. by foreign licensed amateurs
International aspect of radio station call signs
License class determines call sign group
Initial station call sign issued to new amateur
Station call sign assignment systems
Vanity call signs available for assignment
When can I request a Vanity Call Sign?