443 is an in-service United States area code assigned to Maryland. It identifies a numbering region, not a caller’s current location.
NANPA assigns 443 to Maryland. Area code 443 was introduced in 1997 as an overlay to area code 410 in eastern and central Maryland, joined by area code 667 in 2012. Browse other codes in Maryland
Additional area detail: Maryland Public Service Commission.
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, 667 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 +1 443 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 785 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 | 185 |
| ANNAPOLIS | 39 |
| TOWSON | 33 |
| COLUMBIA | 31 |
| GLENBURNIE | 26 |
| Assignment company | Assigned prefixes |
|---|---|
| PAETEC ITEL, LLC | 153 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 121 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 94 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 71 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 69 |
785 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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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.
Area code 443 is located in eastern and central Maryland (including Baltimore and Annapolis), sharing the exact numbering area with 410 and 667.
443 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.