Gaithersburg, MD Area Codes
Gaithersburg is served by area codes 227, 240 and 301. It is in Maryland, Montgomery County. About 143,733 people live in its 9 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 227, 240, 301 |
| State / province | Maryland |
| County | Montgomery County |
| Population | 143,733 |
| ZIP codes | 9 |
| Time zone | Eastern |
| Coordinates | 39.1508, -77.1956 |
What area code is Gaithersburg in?
| Area code | Main state | Population covered | Overlap |
|---|---|---|---|
| 227 | Maryland | 2,624,790 | Yes |
| 240 | Maryland | 2,823,102 | — |
| 301 | Maryland | 2,823,102 | Yes |
ZIP codes in the code footprint
20877, 20878, 20879, 20882, 20883, 20884, 20885, 20898, 20899
Nearby towns and their area codes
Montgomery Village 227, 240, 301Germantown 227, 240, 301Derwood 227, 240, 301Potomac 227, 240, 301Rockville 227, 240, 301Olney 227, 240, 301Boyds 227, 240, 301Clarksburg 227, 240, 301
How to dial
Dial 227 + 7 digits for a number in Gaithersburg, or +1 227 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.