What is the largest city in Frederick County, MD?

Frederick is the largest city or town in Frederick County, with about 83,395 residents.

How many ZIP codes are in Frederick County?

Frederick County includes 28 ZIP Code Tabulation Areas, including 21701, 21702, 21703, 21704, 21705.

What is the population of Frederick County, MD?

About 287,048 people live in Frederick County, based on American Community Survey 5-year estimates.

What counties border Frederick County?

Frederick County borders Montgomery County, Loudoun County, VA, Howard County, Carroll County, Franklin County, PA, Washington County, Adams County, PA.

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

Population

287,048

Land area

661sq mi

People per sq mi

435

ZIP codes

28

Frederick County at a glance

Frederick County is 32% less dense than Maryland as a whole.
It is the 7th most populous of 24 counties in Maryland.
Households here earn a median of $122,002 a year, 18% more than the Maryland figure of $103,678.
A typical owner-occupied home is valued at $464,600 (11% above Maryland) and median rent is $1,774 a month.
The biggest population centers are Frederick (83,395), Ballenger Creek (26,390) and Linganore (14,444).

Local data for Frederick County, MD

Counts from official public data

Housing and community stats

Frederick County, MD, American Community Survey 2020-2024

Full profile

Median household income

$122,002

Poverty rate

6.0%

Median home value

$464,600

Prices +0.9% in a year

Median rent

$1,774/mo

Homeownership

77.0%

Bachelor's or higher

45.8%

Median age

39.0

Average commute

33.1 min

Largest reported origins and ancestries: German Americans (53,633), Irish Americans (37,104), Italian Americans (16,872).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.1%

Sep 2026, -0.8 pts in a year

Average annual pay

$70,784

106,962 jobs, 2025

Income per person

$78,929

BEA, 2024

Federal spending

$3.1B

FY 2026, $11,490 per person

PPP loans

$644M

6,999 loans, 72,770 jobs reported

Campaign donations

$1.4M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

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

Drove alone67.5%
Carpooled7.2%
Public transit1.1%
Walked1.8%
Bicycle0.3%
Taxi, ride-hailing, motorcycle or other1.0%
Worked from home21.2%

Average one-way commute: 33.1 minutes for people who do not work from home.

Environment and hazard risk

Frederick County, MD, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: winter weather

Storm events since 1996

1,546

Most often thunderstorm wind

Flood insurance policies

501

0.6% of homes, county

July high / Jan low

89° / 27°F

43.5 inches of rain a year

Hazards, floods and storm history Check a flood zone 45 historic places

Health statistics

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

All 40 measures

Obesity

34.7%

U.S. 33.3% +1.4 pts

Diabetes

10.6%

U.S. 12.1% -1.5 pts

Smoking

9.2%

U.S. 12.8% -3.6 pts

Uninsured (18-64)

7.7%

U.S. 11.1% -3.4 pts

Cities, towns and ZIP codes in Frederick County

Population shown

Frequently asked questions

What is the largest city in Frederick County, MD?: Frederick is the largest city or town in Frederick County, with about 83,395 residents.
How many ZIP codes are in Frederick County?: Frederick County includes 28 ZIP Code Tabulation Areas, including 21701, 21702, 21703, 21704, 21705.
What is the population of Frederick County, MD?: About 287,048 people live in Frederick County, based on American Community Survey 5-year estimates.
What counties border Frederick County?: Frederick County borders Montgomery County, Loudoun County, VA, Howard County, Carroll County, Franklin County, PA, Washington County, Adams County, PA.