Area code 410: where it is and who calls from it
Area code 410 is in Maryland.
Maryland (Baltimore, Annapolis, Columbia, and all counties and cities which touch the Chesapeake Bay, the Atlantic Ocean, or Delaware, except for St. Mary's County (in 301))
| Where | Maryland |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 1991 |
| Overlay | Yes, with 443, 667 |
| Prefixes assigned | 783 of 792 possible (99%) |
Overlay: 410 covers the same area as 443, 667. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 410 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 410, with how many prefixes each has.
Plus 40 smaller rate centers.
Who holds 410 numbers
- Mobile carrier 17%
- Local phone company 65%
- Internet / business phone carrier 13%
- Paging service 4%
- Phone company 1%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Verizon (local phone) | Local phone company | 507 | 65% |
| Verizon Wireless | Mobile carrier | 53 | 7% |
| AT&T Mobility | Mobile carrier | 51 | 7% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 47 | 6% |
| Spok | Paging service | 28 | 4% |
| T-Mobile (including Sprint) | Mobile carrier | 22 | 3% |
| Level 3 (Lumen) | Internet / business phone carrier | 15 | 2% |
| Teleport Communications America | Internet / business phone carrier | 15 | 2% |
| Windstream (PAETEC) | Internet / business phone carrier | 12 | 2% |
| MetroPCS (T-Mobile) | Mobile carrier | 6 | <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 410?
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 410 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.