District of Columbia
| Area Code | Phone Number | City | State |
| 240 | 327-0089 | Gaithersburg | DC |
| 240 | 239-0089 | Leonardtown | DC |
| 202 | 360-4308 | Washington | DC |
| 202 | 294-0012 | Washington | DC |
| 202 | 360-4014 | Washington | DC |
| 202 | 294-0044 | Washington | DC |
| 202 | 464-1376 | Washington | DC |
| 202 | 360-4450 | Washington | DC |
| 202 | 521-3411 | Washington | DC |
| 202 | 360-4055 | Washington Zone 01 | DC |
| 202 | 552-0108 | Wshngtnzn1 | DC |
