What is the largest city in Monroe County, MI?

Monroe is the largest city or town in Monroe County, with about 20,320 residents.

How many ZIP codes are in Monroe County?

Monroe County includes 18 ZIP Code Tabulation Areas, including 48117, 48131, 48133, 48140, 48144.

What is the population of Monroe County, MI?

About 155,505 people live in Monroe County, based on American Community Survey 5-year estimates.

What counties border Monroe County?

Monroe County borders Wayne County, Lucas County, OH, Washtenaw County, Lenawee County.

Monroe County, MI: Cities, ZIP Codes & Local Data

Population

155,505

Land area

549sq mi

People per sq mi

283

ZIP codes

18

Monroe County at a glance

Monroe County is 59% denser than Michigan as a whole.
It is the 15th most populous of 83 counties in Michigan.
Households here earn a median of $77,335 a year, 6% more than the Michigan figure of $72,875.
A typical owner-occupied home is valued at $228,900 and median rent is $1,059 a month.
The biggest population centers are Monroe (20,320), Lambertville (9,955) and Temperance (8,914).

Local data for Monroe County, MI

Counts from official public data

Housing and community stats

Monroe County, MI, American Community Survey 2020-2024

Full profile

Median household income

$77,335

Poverty rate

10.5%

Median home value

$228,900

Prices +6.3% in a year

Median rent

$1,059/mo

Homeownership

81.7%

Bachelor's or higher

23.3%

Median age

42.8

Average commute

26.2 min

Largest reported origins and ancestries: German Americans (38,314), Irish Americans (17,887), Polish Americans (15,514).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.3%

Sep 2026, -0.3 pts in a year

Average annual pay

$62,304

40,577 jobs, 2025

Income per person

$61,697

BEA, 2024

Federal spending

$1.1B

FY 2026, $7,327 per person

PPP loans

$229M

2,683 loans, 28,003 jobs reported

Campaign donations

$491K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Monroe County, MI, workers 16 and older. American Community Survey 5-year estimates

Drove alone81.5%
Carpooled7.0%
Public transit0.2%
Walked1.3%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other1.0%
Worked from home8.8%

Average one-way commute: 26.2 minutes for people who do not work from home.

Environment and hazard risk

Monroe County, MI, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: strong wind

Storm events since 1996

546

Most often thunderstorm wind

Flood insurance policies

822

1.4% of homes, county

July high / Jan low

84° / 17°F

34.8 inches of rain a year

Hazards, floods and storm history Check a flood zone 11 historic places

Health statistics

Share of adults in Monroe County, MI, CDC PLACES estimates

All 40 measures

Obesity

40.6%

U.S. 33.3% +7.3 pts

Diabetes

12.3%

U.S. 12.1% about the same

Smoking

15.2%

U.S. 12.8% +2.4 pts

Uninsured (18-64)

6.7%

U.S. 11.1% -4.4 pts

Cities, towns and ZIP codes in Monroe County

Population shown

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Frequently asked questions

What is the largest city in Monroe County, MI?: Monroe is the largest city or town in Monroe County, with about 20,320 residents.
How many ZIP codes are in Monroe County?: Monroe County includes 18 ZIP Code Tabulation Areas, including 48117, 48131, 48133, 48140, 48144.
What is the population of Monroe County, MI?: About 155,505 people live in Monroe County, based on American Community Survey 5-year estimates.
What counties border Monroe County?: Monroe County borders Wayne County, Lucas County, OH, Washtenaw County, Lenawee County.