Area Code 443

Maryland

Area code 443 serves Maryland, primarily Baltimore, in the Eastern Time (ET) time zone. It is an overlay area code sharing territory with area code 410.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 667 (Baltimore).

In service since: 01-Jun-1997

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 4,332,726
Population Density: 610 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $90,904
above U.S. median (U.S.: $75,144)
Poverty Rate: 10.9%
near U.S. average (U.S.: 11.5%)
Unemployment Rate: 4.9%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
40.5%
above U.S. average (U.S.: 33.7%)
High School or Lower
28.4%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

Eastern Time (ET)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Eastern Time (ET)

Prefix Utilization

Geographic Coverage

State

Major Cities

Baltimore
Columbia
Ellicott City
Glen Burnie
Dundalk
Severn
Bel Air South
Towson
Odenton
Catonsville
Annapolis
Essex
Severna Park
Randallstown
Owings Mills
Pikesville
Salisbury
Pasadena
Milford Mill
Middle River
Bel Air North
Eldersburg
Parkville
Crofton

and 195 more cities

Area Code 443 geographic coverage map (light mode)

History

Area code 443 serves as an overlay for the same territory as area code 410. It was introduced in 1997 to provide additional phone number capacity for the region. It shares its territory with area codes area code 410 and area code 667.

Demographics

The estimated population served by area code 443 is approximately 4,332,726. The population density is 610 people per square mile, which is higher than the national average of 93. The median household income is $90,904, which is higher than the national median of $75,144. Approximately 40.5% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is higher than the national average. The poverty rate stands at 10.9%, which is near the national rate of 11.5%.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 443).

County	Population	Share
Baltimore, MD	1,222,634	28.2%
Baltimore city, MD	998,461	23.0%
Anne Arundel, MD	638,570	14.7%
Howard, MD	314,714	7.3%
Harford, MD	278,258	6.4%
Carroll, MD	211,304	4.9%
Wicomico, MD	105,474	2.4%
Cecil, MD	104,366	2.4%
Worcester, MD	95,422	2.2%
Calvert, MD	88,995	2.1%
Queen Anne's, MD	66,003	1.5%
Dorchester, MD	42,345	1.0%
Talbot, MD	38,649	0.9%
Caroline, MD	36,137	0.8%
Somerset, MD	33,104	0.8%
Kent, MD	24,053	0.6%
Frederick, MD	22,188	0.5%
Montgomery, MD	8,772	0.2%
Sussex, DE	1,847	0.0%
New Castle, DE	1,430	0.0%

Area Code 443 Family Tree

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Total Codes

Splits

Overlays

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All Descendants

Code ▲	State	Type	In Service	Parent
667	MD	overlay	24-Mar-2012	443

Area code 443 was originally assigned in 01-Jun-1997 to serve MD. Over the years, it has generated 1 descendant area code through a combination of geographic splits and overlays as demand for telephone numbers grew.