What is the largest city in Knox County, IN?

Vincennes is the largest city or town in Knox County, with about 16,586 residents.

How many ZIP codes are in Knox County?

Knox County includes 12 ZIP Code Tabulation Areas, including 47512, 47516, 47524, 47528, 47535.

What is the population of Knox County, IN?

About 36,007 people live in Knox County, based on American Community Survey 5-year estimates.

What counties border Knox County?

Knox County borders Daviess County, Gibson County, Greene County, Sullivan County, Crawford County, IL, Lawrence County, IL, Pike County, Wabash County, IL.

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

Population

36,007

Land area

516sq mi

People per sq mi

70

ZIP codes

12

Knox County at a glance

Knox County is 63% less dense than Indiana as a whole.
The median household income is $61,237, 15% below the Indiana median of $71,957.
A typical owner-occupied home is valued at $137,700 (37% below Indiana) and median rent is $796 a month.
Its largest cities are Vincennes (16,586), Bicknell (3,017) and Oaktown (860).

Local data for Knox County, IN

Counts from official public data

Housing and community stats

Knox County, IN, American Community Survey 2020-2024

Full profile

Median household income

$61,237

Poverty rate

13.7%

Median home value

$137,700

Prices +3.3% in a year

Median rent

$796/mo

Homeownership

67.8%

Bachelor's or higher

19.1%

Median age

39.0

Average commute

19.7 min

Largest reported origins and ancestries: German Americans (8,053), Irish Americans (3,192), French Americans (1,270).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.5%

Sep 2026, +0.2 pts in a year

Average annual pay

$53,538

16,811 jobs, 2025

Income per person

$59,222

BEA, 2024

Federal spending

$264M

FY 2026, $7,278 per person

PPP loans

$69.6M

1,134 loans, 9,622 jobs reported

Campaign donations

$200K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

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

Drove alone84.5%
Carpooled8.5%
Public transit0.3%
Walked3.8%
Bicycle0.3%
Taxi, ride-hailing, motorcycle or other0.2%
Worked from home2.3%

Average one-way commute: 19.7 minutes for people who do not work from home.

Environment and hazard risk

Knox County, IN, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: earthquake

Storm events since 1996

638

Most often thunderstorm wind

Flood insurance policies

59

0.4% of homes, county

July high / Jan low

89° / 22°F

46.8 inches of rain a year

Hazards, floods and storm history Check a flood zone 8 historic places

Health statistics

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

All 40 measures

Obesity

36.8%

U.S. 33.3% +3.5 pts

Diabetes

13.2%

U.S. 12.1% +1.1 pts

Smoking

17.5%

U.S. 12.8% +4.7 pts

Uninsured (18-64)

8.3%

U.S. 11.1% -2.8 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, IN?: Vincennes is the largest city or town in Knox County, with about 16,586 residents.
How many ZIP codes are in Knox County?: Knox County includes 12 ZIP Code Tabulation Areas, including 47512, 47516, 47524, 47528, 47535.
What is the population of Knox County, IN?: About 36,007 people live in Knox County, based on American Community Survey 5-year estimates.
What counties border Knox County?: Knox County borders Daviess County, Gibson County, Greene County, Sullivan County, Crawford County, IL, Lawrence County, IL, Pike County, Wabash County, IL.