Area Code 667

Maryland

Area code 667 serves Maryland, primarily Baltimore, in the Eastern Time (ET) time zone. It is an overlay area code sharing territory with area code 410.

Published: February 17, 2026Verified against NANPA and FCC records

Overlay Area Code

This area code shares its geographic footprint with an overlay code, so the same cities are served by two area codes. Because overlays leave existing numbers untouched, this region's relief planning favors adding codes over redrawing boundaries.

The codes serving this same region: area code 410 (Baltimore).

In service since: 24-Mar-2012

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 4,332,726
Population Density: 614 people/sq mi
above U.S. average (U.S.: 95 people/sq mi)
Median Household Income: $91,768
above U.S. median (U.S.: $80,734)
Poverty Rate: 10.8%
below U.S. average (U.S.: 12.5%)
Unemployment Rate: 4.9%
near U.S. average (U.S.: 5.2%)
Education Attainment: Bachelor's Degree+
41.2%
above U.S. average (U.S.: 35.7%)
High School or Lower
28.1%

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 income ranking and density ranking.

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 667 geographic coverage map (light mode)

Demographics

The estimated population served by area code 667 is approximately 4,332,726. The population density is 614 people per square mile, which is higher than the national average of 95. The median household income is $91,768, which is higher than the national median of $80,734. Approximately 41.2% of adults hold a bachelor's degree or higher, compared to the national rate of 35.7%. This rate is higher than the national average. The poverty rate stands at 10.8%, which is lower than the national rate of 12.5%.

History

Area code 667 serves as an overlay for the same territory as area code 410. It was introduced in 2012 to provide additional phone number capacity for the region. It shares its territory with area codes area code 410 and area code 443.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 667).

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%