| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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| 1 | C D C C | K0AD | 49 | 42.24 % | | 55 | 43.65 % | | | 2 | C D C C C | K0PEA | 24 | 20.69 % | | 24 | 19.05 % | | | 3 | C C D C | AA3B | 17 | 14.66 % | | 18 | 14.29 % | | | 4 | C C D C C | AB9PN | 15 | 12.93 % | | 15 | 11.90 % | | | 5 | C D C | K1C | 6 | 5.17 % | | 7 | 5.56 % | | | 6 | C C D C C C | KB0IWW | 5 | 4.31 % | | 5 | 3.97 % | |
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