What is the largest city in Washington County, OH?

Marietta is the largest city or town in Washington County, with about 13,203 residents.

How many ZIP codes are in Washington County?

Washington County includes 15 ZIP Code Tabulation Areas, including 45714, 45721, 45724, 45729, 45742.

What is the population of Washington County, OH?

About 58,978 people live in Washington County, based on American Community Survey 5-year estimates.

What counties border Washington County?

Washington County borders Wood County, WV, Athens County, Noble County, Morgan County, Monroe County, Tyler County, WV, Pleasants County, WV.

Washington County, OH: Cities, ZIP Codes & Local Data

Population

58,978

Land area

632sq mi

People per sq mi

93

ZIP codes

15

Washington County at a glance

Washington County is 68% less dense than Ohio as a whole.
The median household income is $63,603, 11% below the Ohio median of $71,389.
A typical owner-occupied home is valued at $185,600 (14% below Ohio) and median rent is $852 a month.
Its largest cities are Marietta (13,203), Belpre (6,654) and Devola (2,688).

Local data for Washington County, OH

Counts from official public data

Housing and community stats

Washington County, OH, American Community Survey 2020-2024

Full profile

Median household income

$63,603

Poverty rate

13.7%

Median home value

$185,600

Prices +6.4% in a year

Median rent

$852/mo

Homeownership

75.4%

Bachelor's or higher

21.9%

Median age

44.0

Average commute

23.5 min

Largest reported origins and ancestries: German Americans (13,357), Irish Americans (8,041), Italian Americans (1,647).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.8%

Sep 2026, -0.4 pts in a year

Average annual pay

$61,409

25,437 jobs, 2025

Income per person

$57,485

BEA, 2024

Federal spending

$429M

FY 2026, $7,171 per person

PPP loans

$118M

1,196 loans, 12,790 jobs reported

Campaign donations

$333K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Washington County, OH, workers 16 and older. American Community Survey 5-year estimates

Drove alone81.1%
Carpooled6.9%
Public transit0.4%
Walked1.9%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other0.5%
Worked from home9.1%

Average one-way commute: 23.5 minutes for people who do not work from home.

Environment and hazard risk

Washington County, OH, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: landslide

Storm events since 1996

648

Most often flood

Flood insurance policies

278

1.2% of homes, county

July high / Jan low

85° / 23°F

45.3 inches of rain a year

Hazards, floods and storm history Check a flood zone 30 historic places

Health statistics

Share of adults in Washington County, OH, CDC PLACES estimates

All 40 measures

Obesity

43.7%

U.S. 33.3% +10.4 pts

Diabetes

13.8%

U.S. 12.1% +1.7 pts

Smoking

17.0%

U.S. 12.8% +4.2 pts

Uninsured (18-64)

7.7%

U.S. 11.1% -3.4 pts

Cities, towns and ZIP codes in Washington County

Population shown

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Frequently asked questions

What is the largest city in Washington County, OH?: Marietta is the largest city or town in Washington County, with about 13,203 residents.
How many ZIP codes are in Washington County?: Washington County includes 15 ZIP Code Tabulation Areas, including 45714, 45721, 45724, 45729, 45742.
What is the population of Washington County, OH?: About 58,978 people live in Washington County, based on American Community Survey 5-year estimates.
What counties border Washington County?: Washington County borders Wood County, WV, Athens County, Noble County, Morgan County, Monroe County, Tyler County, WV, Pleasants County, WV.