Amateur Radio Callsigns in ZIP Code: 20818
| Callsign | Name | City | State | Country |
|---|---|---|---|---|
| N3JMM | MARCUS, MICHAEL J | Cabin John | MD | United States |
| N3VNY | LEVIN, ALAN C | CABIN JOHN | MD | United States |
| KC3HEL | Henderson, Douglas O | Cabin John | MD | United States |
| KC3THP | Harrison, Dallas | Cabin John | MD | United States |
| KC3UQI | Brown, Ian J | Cabin John | MD | United States |
| KC3WUO | Cook, Jonathan M | Cabin John | MD | United States |