What is the largest city in Knox County, OH?

Mount Vernon is the largest city or town in Knox County, with about 17,052 residents.

How many ZIP codes are in Knox County?

Knox County includes 11 ZIP Code Tabulation Areas, including 43005, 43011, 43014, 43019, 43022.

What is the population of Knox County, OH?

About 63,142 people live in Knox County, based on American Community Survey 5-year estimates.

What counties border Knox County?

Knox County borders Delaware County, Licking County, Richland County, Ashland County, Holmes County, Coshocton County, Morrow County.

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

Population

63,142

Land area

525sq mi

People per sq mi

120

ZIP codes

11

Knox County at a glance

Knox County is 58% less dense than Ohio as a whole.
Households here earn a median of $73,878 a year, 3% more than the Ohio figure of $71,389.
A typical owner-occupied home is valued at $239,400 (11% above Ohio) and median rent is $950 a month.
The biggest population centers are Mount Vernon (17,052), Apple Valley (5,548) and Fredericktown (2,652).

Local data for Knox County, OH

Counts from official public data

Housing and community stats

Knox County, OH, American Community Survey 2020-2024

Full profile

Median household income

$73,878

Poverty rate

11.6%

Median home value

$239,400

Prices +4.6% in a year

Median rent

$950/mo

Homeownership

75.5%

Bachelor's or higher

24.7%

Median age

39.4

Average commute

25.7 min

Largest reported origins and ancestries: German Americans (14,583), Irish Americans (7,863), Italian Americans (2,276).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.3%

Sep 2026, -0.5 pts in a year

Average annual pay

$57,796

20,365 jobs, 2025

Income per person

$58,293

BEA, 2024

Federal spending

$381M

FY 2026, $6,067 per person

PPP loans

$73.8M

1,318 loans, 10,010 jobs reported

Campaign donations

$415K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

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

Drove alone73.8%
Carpooled6.9%
Public transit0.2%
Walked4.0%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other1.2%
Worked from home13.7%

Average one-way commute: 25.7 minutes for people who do not work from home.

Environment and hazard risk

Knox County, OH, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: hail

Storm events since 1996

405

Most often thunderstorm wind

Flood insurance policies

118

0.5% of homes, county

July high / Jan low

82° / 17°F

42.4 inches of rain a year

Hazards, floods and storm history Check a flood zone 35 historic places

Health statistics

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

All 40 measures

Obesity

37.1%

U.S. 33.3% +3.8 pts

Diabetes

12.6%

U.S. 12.1% +0.5 pts

Smoking

15.5%

U.S. 12.8% +2.7 pts

Uninsured (18-64)

7.6%

U.S. 11.1% -3.5 pts

Cities, towns and ZIP codes in Knox County

Population shown

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Frequently asked questions

What is the largest city in Knox County, OH?: Mount Vernon is the largest city or town in Knox County, with about 17,052 residents.
How many ZIP codes are in Knox County?: Knox County includes 11 ZIP Code Tabulation Areas, including 43005, 43011, 43014, 43019, 43022.
What is the population of Knox County, OH?: About 63,142 people live in Knox County, based on American Community Survey 5-year estimates.
What counties border Knox County?: Knox County borders Delaware County, Licking County, Richland County, Ashland County, Holmes County, Coshocton County, Morrow County.