227
Area code
MD
United States geographic area code, in service since 2023-06-14. Part of the 227/240/301 overlay complex — ten-digit dialing required.
Statusin service
Introduced2023-06-14
JurisdictionMD, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 19.2% of assignable prefixes assigned
As of 09/17/2026
0%152 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2023-07-27, most recent 2026-09-04.
Area codes serve rate-center geographies, not municipal boundaries. “MD” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC - MD | 38 | 25% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - DC | 37 | 24.3% |
| 03 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 22 | 14.5% |
| 04 | MULTIPLE OCN LISTING | 9 | 5.9% |
| 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 9 | 5.9% |
| 06 | COMMIO, LLC | 7 | 4.6% |
| 07 | WIDE VOICE, LLC - MD | 5 | 3.3% |
| 08 | ONVOY SPECTRUM, LLC | 5 | 3.3% |
| 09 | BANDWIDTH.COM CLEC, LLC - MD | 5 | 3.3% |
| 10 | 5 | 3.3% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2022-09-27 NPA 227 to Overlay NPA 240/301 (Maryland)
- 2023-06-14Area code 227 entered service (created from 301).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2022-09-27 | PL-603 ↗ | NPA 227 to Overlay NPA 240/301 (Maryland) |