• county
  • FIPS 18083
  • Largest town: Vincennes

Knox County, Indiana

Knox County had 35,872 residents in the Census Vintage 2024 estimate, on 515.8 square miles of land. It ranks 44th of 92 in Indiana by population and 6th by land area.

Population
35,872
#44 of 92 in Indiana · #1,295 in US
Area
515.8 sq mi
#6 of 92 in Indiana · #2,022 in US
Density
70 / sq mi
#60 of 92 in Indiana · #1,186 in US
Median household income
$57,242
#84 of 92 in Indiana · #2,106 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Knox County within Indiana. Pin: Indianapolis.

Measure from here

Tools and pages that start from Knox County

Knox County population, land area and income

Knox County had 35,872 residents in the Census Vintage 2024 estimate, on 515.8 square miles of land. It ranks 44th of 92 in Indiana by population and 6th by land area. That works out to 69.5 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Indiana has 34,874 residents, about the same as Knox County.

Its SAIPE 2023 median household income of $57,242 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

35,872

3144th1st

1295th of 3,144 (US)

Land area

516 sq mi

3144th1st

2022nd of 3,144 (US)

Density

69.5 / sq mi

3144th1st

1186th of 3,144 (US)

Median household income

$57,242

3143rd1st

2106th of 3,143 (US)

Rank within Indiana (92)

Population

35,872

92nd1st

44th of 92 (IN)

Land area

516 sq mi

92nd1st

6th of 92 (IN)

Density

69.5 / sq mi

92nd1st

60th of 92 (IN)

Median household income

$57,242

92nd1st

84th of 92 (IN)

How Knox County's population changed since 2020

Knox County lost 385 residents between the July 2020 and July 2024 estimates, a drop of 1.1%. That ranks 87th of 92 in Indiana for growth. The median Indiana county changed by +0.8%, and the state as a whole by +2.0%.

Since the April 2020 estimates base, Knox County recorded 1,618 births and 2,169 deaths, a natural change of -551. Net international migration added +358 and net domestic migration, people moving to or from other US counties, came to -219. The largest single component was natural change, which removed 551 people.

36.3k202036.0k202135.9k202236.0k202335.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
1,618
Deaths
2,169
Net international migration
+358
Net domestic migration
-219
Change, July 2023 to July 2024
-155

Where Knox County is

The Census internal point of Knox County is at 38.688400, -87.420400. It sits in UTM zone 16N. The map shades Indiana's 92 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Knox County outlined. Dots are towns of 1,000+ people with residents in it.

Vigo County: +0.0%Fayette County: -0.1%Grant County: -0.1%Noble County: +0.7%Clay County: -0.0%Fulton County: -2.3%Henry County: +0.3%Jasper County: +1.5%Carroll County: +2.0%Huntington County: +0.8%Howard County: +0.6%Tipton County: -0.4%Starke County: +0.3%Lawrence County: +0.4%Jennings County: +0.2%Jay County: -1.5%Greene County: +1.3%Blackford County: -2.4%Madison County: +3.1%Parke County: +2.1%DeKalb County: +2.4%Scott County: +1.5%Benton County: +1.7%Wells County: +2.3%Wabash County: -0.5%Union County: -2.8%Marshall County: +0.8%Putnam County: +3.1%Clinton County: -0.8%Hamilton County: +8.8%Hancock County: +10.8%Jackson County: +2.0%Hendricks County: +8.5%Johnson County: +5.1%Decatur County: -0.2%Lake County: +0.8%Newton County: +2.5%Fountain County: +2.1%Crawford County: +0.0%Perry County: +0.9%Martin County: +0.6%Dearborn County: +1.3%Morgan County: +2.8%Monroe County: +0.0%Switzerland County: +2.5%Ohio County: +1.2%Sullivan County: -0.2%Franklin County: +1.5%Adams County: +2.0%Jefferson County: -0.5%Knox County: -1.1%Ripley County: +0.8%Vanderburgh County: +0.0%Gibson County: -0.1%LaGrange County: +1.5%Dubois County: -0.0%Harrison County: +0.8%Randolph County: -0.3%Brown County: +1.1%Shelby County: +1.3%Tippecanoe County: +2.8%Daviess County: +2.2%Delaware County: +1.1%Elkhart County: +0.2%Whitley County: +1.6%Allen County: +3.4%Montgomery County: +1.8%Miami County: -0.8%St. Joseph County: +0.4%Kosciusko County: +0.6%Floyd County: +1.8%Rush County: -0.1%Wayne County: -0.2%Posey County: -0.5%Clark County: +5.0%Orange County: -0.1%Marion County: +0.5%Boone County: +10.7%Porter County: +1.5%Steuben County: +1.2%Vermillion County: +0.8%Cass County: -0.6%Owen County: +2.5%White County: +0.6%Washington County: +0.4%Pulaski County: -0.8%Pike County: -1.1%Warren County: +0.3%Warrick County: +3.7%Spencer County: +1.8%LaPorte County: -0.8%Bartholomew County: +3.1%
Change 2020 to 2024
  1. < -0.2%
  2. < +0.4%
  3. < +1.2%
  4. < +2.1%
  5. ≥ +2.1%
no data

Orange pin: Knox County internal point. Dark pin: Indianapolis.

Internal point

Decimal
38.688400, -87.420400
DMS
38°41'18.24"N 87°25'13.44"W
UTM
16N 463437.6E 4282282.8N
Geohash
dncu4en2m
Plus code
86CJMHQH+9R

Towns in Knox County

2 incorporated places of 1,000+ people have residents in Knox County, 19,505 people together, or 54% of the county. Each figure counts only the part of the town inside Knox County; towns marked "part" extend into another county. The largest is Vincennes with 16,506.

  1. 01Vincennes16,506
  2. 02Bicknell2,999
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Knox County

The Census 2024 county adjacency file lists 8 neighbors for Knox County, including 3 across a state line. The most populous is Daviess County, IN, with 34,097 residents. Distances run between Census internal points in a straight line.

Distance to Indianapolis and the nearest big city

Indianapolis is 100.7 miles NE of Knox County's internal point in a straight line. The nearest place of 100,000 or more is Evansville, IN (population 115,395), 48.8 miles away. The nearest place of 10,000 or more is Vincennes, IN (population 16,506), 4.9 miles away.

Knox County FIPS code

The FIPS code of Knox County is 18083: state code 18 for Indiana plus county code 083. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $57,242.

Questions people ask

What is the population of Knox County, Indiana?

The Census Vintage 2024 estimate for July 1, 2024 is 35,872. That is down 385 people (1.1%) from the July 2020 estimate of 36,257.

What is the FIPS code of Knox County?

18083. The first two digits (18) are Indiana; the last three (083) identify the county.

What is the largest town in Knox County?

Vincennes, with 16,506 residents inside Knox County in 2024.

Which counties border Knox County?

8 county-equivalents border it in the Census 2024 adjacency file: Daviess County, IN; Gibson County, IN; Greene County, IN; Sullivan County, IN; Crawford County, IL; Lawrence County, IL; Pike County, IN; Wabash County, IL.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.