Maryland Area Codes
9 active area codes · Baltimore · Population around 4,754,303
Maryland has 9 active area codes, serving cities like Baltimore, Columbia, and Frederick. Some of them are overlays that share the same territory, so local calls there use all ten digits. Each code below links to its cities, carriers, timezone, and coverage map.
Maryland Area Code Map
What area codes does Maryland have?
- 227OverlayColumbiaVaries · 314 cities · 2,453,634
- 240OverlayGermantownEastern Time (ET) · 314 cities · 2,453,634
- 301OverlayGermantownEastern Time (ET) · 314 cities · 2,453,634
- 302WilmingtonEastern Time (ET) · 77 cities · 431,918
- 304OverlayCharlestonEastern Time (ET) · 403 cities · 766,579
- 410OverlayBaltimoreEastern Time (ET) · 208 cities · 2,468,985
- 443OverlayBaltimoreEastern Time (ET) · 208 cities · 2,468,985
- 667OverlayBaltimoreEastern Time (ET) · 208 cities · 2,468,985
- 681OverlayCharlestonEastern Time (ET) · 403 cities · 766,579
Which cities are the largest in Maryland?
| # | City | Area Codes | Population |
|---|---|---|---|
| 1 | Baltimore | 410 / 443 / 667 | 568,271 |
| 2 | Columbia | 227 / 240 / 301 / 410 / 443 / 667 | 99,615 |
| 3 | Ellicott City | 410 / 443 / 667 | 65,834 |
| 4 | Frederick | 227 / 240 / 301 | 89,537 |
| 5 | Gaithersburg | 227 / 240 / 301 | 70,686 |
| 6 | Germantown | 227 / 240 / 301 | 86,395 |
| 7 | Glen Burnie | 410 / 443 / 667 | 67,639 |
| 8 | Rockville | 227 / 240 / 301 | 68,417 |
| 9 | Silver Spring | 227 / 240 / 301 | 71,452 |
| 10 | Waldorf | 227 / 240 / 301 | 67,752 |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Frequently Asked Questions
How many area codes does Maryland have?
Maryland has 9 active area codes: 227, 240, 301, 302, 304, 410, 443, 667, 681.
What is the main area code for Maryland?
The 227 area code is among the primary area codes for Maryland, serving Columbia and surrounding communities.
What are the largest cities in Maryland?
The largest cities in Maryland include Baltimore, Columbia, Frederick, Germantown, Silver Spring.
What is the total population of Maryland?
Maryland has an estimated total population of 4,754,303 based on US Census PEP 2024 data.