Area code 227: where it is and who calls from it
Area code 227 is in Maryland.
Western Maryland (Washington, D.C., suburbs; all counties which touch the Potomac River; Silver Spring, Hagerstown, Frederick, Rockville, Cumberland)
| Where | Maryland |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 2023 |
| Overlay | Yes, with 240, 301 |
| Prefixes assigned | 142 of 792 possible (18%) |
Overlay: 227 covers the same area as 240, 301. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 227 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 227, with how many prefixes each has.
Who holds 227 numbers
- Mobile carrier 51%
- Local phone company 1%
- Internet / business phone carrier 42%
- Phone company 6%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Onvoy | Internet / business phone carrier | 44 | 31% |
| AT&T Mobility | Mobile carrier | 41 | 29% |
| T-Mobile (including Sprint) | Mobile carrier | 21 | 15% |
| Verizon Wireless | Mobile carrier | 9 | 6% |
| Commio | Internet / business phone carrier | 7 | 5% |
| Wide Voice | Phone company | 5 | 4% |
| Bandwidth | Internet / business phone carrier | 5 | 4% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 3 | 2% |
| AT&T (local phone) | Local phone company | 2 | 1% |
| Callworks | Phone company | 1 | <1% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Maryland.
Other area codes in Maryland
Got a call from 227?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 227 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.