Rockville, MD Area Codes
Rockville is served by area codes 227, 240 and 301. It is in Maryland, Montgomery County. About 145,330 people live in its 8 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 227, 240, 301 |
| State / province | Maryland |
| County | Montgomery County |
| Population | 145,330 |
| ZIP codes | 8 |
| Time zone | Eastern |
| Coordinates | 39.0896, -77.1482 |
What area code is Rockville 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
20847, 20848, 20849, 20850, 20851, 20852, 20853, 20857
Nearby towns and their area codes
Derwood 227, 240, 301Potomac 227, 240, 301Gaithersburg 227, 240, 301Bethesda 227, 240, 301Kensington 227, 240, 301Olney 227, 240, 301Germantown 227, 240, 301Montgomery Village 227, 240, 301
How to dial
Dial 227 + 7 digits for a number in Rockville, or +1 227 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.