Amateur Radio Callsigns in ZIP Code: 21660
| Callsign | Name | City | State | Country |
|---|---|---|---|---|
| K1VUV | GIAIMO JR, ROSARIO A | RIDGELY | MD | United States |
| KA3DDV | VOSHELL, JOHN E | RIDGELY | MD | United States |
| KN3K | CLARK, CALVERT L | RIDGELY | MD | United States |
| KG3AA | Groves, Kenneth F | Ridgely | MD | United States |
| KC3FZM | Lockhart Sr., Daniel J | Ridgely | MD | United States |
| KC3LGF | Lockhart, Ginger M | Ridgely | MD | United States |
| KC3PKT | Briguglio, Davide L | Ridgely | MD | United States |