| General Information | |
|---|---|
| Country | United States |
| State/Province | Maryland |
| Major City | Gaithersburg |
| Time Zone | Eastern (UTC-05:00) |
| Current Local Time | 01:44 |
| Prefix | County | Primary City |
|---|---|---|
| 240-200 | Prince Georges | Brentwood |
| 240-201 | Saint Marys | Ridge |
| 240-203 | Washington | Hagerstown |
| 240-204 | Montgomery | Chevy Chase |
| 240-205 | Montgomery | Glen Echo |
| 240-206 | Prince Georges | Bowie |
| 240-207 | Frederick | Monrovia |
| 240-208 | Charles | Port Tobacco |
| 240-209 | Charles | Indian Head |
| 240-210 | Charles | Waldorf |
| 240-212 | Garrett | Oakland |
| 240-213 | Charles | Waldorf |
| 240-214 | Saint Marys | Charlotte Hall |
| 240-215 | Frederick | Frederick |
| 240-216 | Charles | Waldorf |
| 240-217 | Washington | Hagerstown |
| 240-218 | Charles | Nanjemoy |
| 240-219 | Saint Marys | Ridge |
| 240-220 | Montgomery | Poolesville |
| 240-221 | Montgomery | Rockville |
| 240-222 | Charles | Waldorf |
| 240-223 | Prince Georges | Brentwood |
| 240-224 | Montgomery | Gaithersburg |
| 240-225 | Frederick | Frederick |
| 240-228 | Anne Arundel | Laurel |
| 240-229 | Charles | Waldorf |
| 240-230 | Charles | Hughesville |
| 240-231 | Washington | Hagerstown |
| 240-232 | Prince Georges | Brentwood |
| 240-233 | Charles | Issue |
| 240-234 | Prince Georges | Brentwood |
| 240-235 | Montgomery | Chevy Chase |
| 240-236 | Frederick | Frederick |
| 240-237 | Saint Marys | Callaway |
| 240-238 | Montgomery | Rockville |
| 240-239 | Saint Marys | Leonardtown |
| 240-241 | Montgomery | Bethesda |
| 240-242 | Montgomery | Bethesda |
| 240-243 | Montgomery | Gaithersburg |
| 240-244 | Montgomery | Bethesda |
| 240-245 | Prince Georges | Bowie |
| 240-246 | Montgomery | Gaithersburg |
| 240-247 | Prince Georges | Brentwood |
| 240-248 | Saint Marys | Ridge |
| 240-249 | Saint Marys | Charlotte Hall |
| 240-250 | Prince Georges | Brandywine |
| 240-251 | Washington | Cascade |
| 240-252 | Montgomery | Gaithersburg |
| 240-253 | Prince Georges | Cheltenham |
| 240-254 | Charles | Hughesville |