Caller ID for
Area code 443
Area code 443 Baltimore, Maryland
Area code 443 is in Maryland, with numbers assigned in Baltimore, Annapolis, Towson and 61 more places. It’s 12:12 AM there now.
- State
- Maryland6 area codes in Maryland
- Time zone
- Eastern12:12 AM there now
- Exchanges
- 78564 places
- Overlay
- 410 and 667Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 443 is
Numbers in 443 are assigned to 64 places in 17 counties: Baltimore city, Baltimore County, Anne Arundel County, Harford County, Howard County, Carroll County, plus 11 more.
Baltimore has the most, 24% of the exchanges; the rest are spread across 63 other places.
- Baltimore185
- Annapolis39
- Towson33
- Columbia31
- Glen Burnie26
- Catonsville22
- Pikesville21
- Salisbury20
- Bel Air19
- Westminster15
- Aberdeen15
- Elkton14
- Parkville14
- Essex14
- Cockeysville14
- Woodlawn13
- Dundalk10
- Severna Park10
- Fallston10
- Arbutus10
- Easton9
- Randallstown9
- Severn9
- Sykesville9
Phone companies in 443
785 blocks of numbers in 443 are held by 22 phone companies. The most belong to Paetec Itel (153), Verizon Wireless (121) and T-Mobile (120).
A large share, about 52%, belongs to competitive and internet phone carriers; wireless networks hold 40% and local phone and cable companies 8%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
443 went into service in 1997, added to the area of 410.
410 (since 1991) and 667 (since 2012) share the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
2 new exchanges were assigned since 2021, the latest in November 2023.
Calling 443
It’s 12:12 AM Eastern time in 443 right now.
From elsewhere in the U.S., dial 1, 443 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
Maryland has 6 area codes: 227, 240, 301, 410, 443 and 667.
- 202 · Washington, DC · about 35 mi
- 771 · Washington, DC · about 35 mi
- 240 · Frederick, MD · about 52 mi
- 302 · Wilmington, DE · about 54 mi
- 227 · Myersville, MD · about 54 mi
- 703 · Herndon, VA · about 54 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 443 area code
Map of the 443 area code around Baltimore, Annapolis and Towson, Maryland.
Cities on the map
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Questions about 443
Where is area code 443?
In Maryland, covering Baltimore, Annapolis and Towson and other places across 17 counties.
What time zone is 443 in?
Eastern time. It was 12:12 AM there when this page loaded.
Is 443 an overlay?
Yes. 410 and 667 serve the same area, so dial all 10 digits for local calls.
Which phone companies have 443 numbers?
22 companies hold blocks; the most belong to Paetec Itel, Verizon Wireless and T-Mobile. About 40% of blocks are wireless.
Is 443 running out of numbers?
Not on record. 2 new exchanges have been assigned since 2021.