Amateur Radio Callsigns in ZIP Code: 21837
| Callsign | Name | City | State | Country |
|---|---|---|---|---|
| KA3UMM | AYERS, DONALD E | MARDELA SPRINGS | MD | United States |
| KC2EPY | ROBERTS, HAROLD J | Mardela Springs | MD | United States |
| N3RKZ | LITTLE, JOE W | MARDELA | MD | United States |
| KB3LEF | Waller, Adam | MARDELA SPRINGS | MD | United States |
| KU3N | Bradley, Michelle A | Mardela Springs | MD | United States |