667 is an in-service United States area code assigned to Maryland. It identifies a numbering region, not a caller’s current location.
NANPA assigns 667 to Maryland. Maryland’s 667 code overlays the 410/443 numbering area and can serve Baltimore. It is not limited to Baltimore; the assignment does not identify a caller’s current location. Browse other codes in Maryland
Additional area detail: AT&T 667 coverage guide.
View the official area-code maps ↗. Maps show numbering areas, not a caller’s location.
NANPA lists Eastern for this numbering area. These are numbering-region time zones, not a caller’s current location.
An area code can span more than one time zone. Local daylight-saving rules may differ.
The NANPA source lists 410, 443 in the same overlay complex. An overlay can serve the same broad numbering area; individual numbers still do not prove where a person is.
Use the North American country calling code +1 followed by the three-digit area code and seven-digit local number. For example, write the pattern as +1 667 XXX XXXX. Local dialing rules and charges depend on your location and provider. Check a supported dialing format or check NANPA’s 10-digit dialing list.
NANPA’s US report listed 440 assigned prefixes on 2026-09-29. These are code assignments, not a count of active phone numbers or proof of a caller’s current carrier. Search any US area code and prefix.
| Rate center | Assigned prefixes |
|---|---|
| BALTIMORE | 73 |
| PIKESVILLE | 24 |
| ABERDEEN | 23 |
| SALISBURY | 23 |
| ANNAPOLIS | 15 |
| Assignment company | Assigned prefixes |
|---|---|
| ONVOY, LLC - MD | 81 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 55 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 54 |
| CORE COMMUNICATIONS, INC.- MD | 41 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 24 |
440 assigned prefixes are listed for this area code. Search NANPA’s US central-office code assignments. The listed company and rate center describe an assignment; number portability means they cannot identify the current carrier, subscriber, or caller.
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Enter the full ten-digit number to see its structure and formatting. The check stays in your browser.
Enter a 10-digit +1 North American number. We check its structure and area-code record, not the caller’s identity or whether the line is active.
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The displayed number may be spoofed. Do not rely on an area code as proof of caller identity. If the caller claims to represent a business, end the call and contact that business using a number you found independently.
Yes. AT&T and the Maryland PSC list Baltimore within the 667 numbering area. It also covers the broader 410/443 overlay region in eastern Maryland.
667 is assigned to Maryland, and the NANPA record associates it with Eastern time. A phone number does not reveal its owner’s current time zone. The clock above uses a representative time zone for the numbering area.
No. An area code is an assignment, and a person can travel, move, use internet calling, or display a spoofed number.
No. OfficialAreaCode has no live subscriber directory or spam-report database.