What is the largest city in Baltimore County, MD?

Dundalk is the largest city or town in Baltimore County, with about 65,969 residents.

How many ZIP codes are in Baltimore County?

Baltimore County includes 43 ZIP Code Tabulation Areas, including 21013, 21023, 21030, 21031, 21051.

What is the population of Baltimore County, MD?

About 850,796 people live in Baltimore County, based on American Community Survey 5-year estimates.

What counties border Baltimore County?

Baltimore County borders Anne Arundel County, Baltimore city, York County, PA, Howard County, Harford County, Carroll County.

Baltimore County, MD: Cities, ZIP Codes & Local Data

Population

850,796

Land area

598sq mi

People per sq mi

1,422

ZIP codes

43

Baltimore County at a glance

Baltimore County is about 2.2 times as dense as Maryland as a whole.
It is the 3rd most populous of 24 counties in Maryland.
Households here earn a median of $91,768 a year, 11% less than the Maryland figure of $103,678.
A typical owner-occupied home is valued at $349,300 (17% below Maryland) and median rent is $1,627 a month.
The biggest population centers are Dundalk (65,969), Towson (58,679) and Catonsville (43,368).

Local data for Baltimore County, MD

Counts from official public data

Housing and community stats

Baltimore County, MD, American Community Survey 2020-2024

Full profile

Median household income

$91,768

Poverty rate

9.8%

Median home value

$349,300

Prices +2.9% in a year

Median rent

$1,627/mo

Homeownership

66.4%

Bachelor's or higher

42.3%

Median age

39.7

Average commute

28.0 min

Largest reported origins and ancestries: German Americans (117,573), Irish Americans (89,170), Italian Americans (45,251).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.6%

Sep 2026, -0.8 pts in a year

Average annual pay

$74,175

369,662 jobs, 2025

Income per person

$78,953

BEA, 2024

Federal spending

$8.5B

FY 2026, $9,937 per person

PPP loans

$2.2B

27,447 loans, 237,161 jobs reported

Campaign donations

$5.9M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Baltimore County, MD, workers 16 and older. American Community Survey 5-year estimates

Drove alone69.5%
Carpooled7.8%
Public transit2.5%
Walked1.9%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other1.7%
Worked from home16.5%

Average one-way commute: 28.0 minutes for people who do not work from home.

Environment and hazard risk

Baltimore County, MD, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: winter weather

Storm events since 1996

2,155

Most often thunderstorm wind

Flood insurance policies

3,097

1.2% of homes, county

July high / Jan low

87° / 27°F

Hazards, floods and storm history Check a flood zone 46 historic places

Health statistics

Share of adults in Baltimore County, MD, CDC PLACES estimates

All 40 measures

Obesity

34.0%

U.S. 33.3% +0.7 pts

Diabetes

13.1%

U.S. 12.1% +1.0 pts

Smoking

11.1%

U.S. 12.8% -1.7 pts

Uninsured (18-64)

8.1%

U.S. 11.1% -3.0 pts

Cities, towns and ZIP codes in Baltimore County

Population shown

Frequently asked questions

What is the largest city in Baltimore County, MD?: Dundalk is the largest city or town in Baltimore County, with about 65,969 residents.
How many ZIP codes are in Baltimore County?: Baltimore County includes 43 ZIP Code Tabulation Areas, including 21013, 21023, 21030, 21031, 21051.
What is the population of Baltimore County, MD?: About 850,796 people live in Baltimore County, based on American Community Survey 5-year estimates.
What counties border Baltimore County?: Baltimore County borders Anne Arundel County, Baltimore city, York County, PA, Howard County, Harford County, Carroll County.