The 240 area code is located in the state of Maryland, and according to Intelius data, covers roughly 457,348 phone numbers and 574,160 listings across 788 prefixes.
This is a General Purpose Code, in service since June 1, 1997.
Area code 240 is part of an overlay complex shared with:
Area code 240 was split from area code 301.
Local calls within area code 240 require 10 digits dialing, while long-distance calls require 1 plus 10 digits dialing.
Have you received a call from a number with a 240 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 603,380 |
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| County Population (2025) | 339,183 |
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| County Population (2025) | 1,074,582 |
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| County Population (2025) | 970,374 |
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