• county
  • FIPS 18057
  • Largest town: Fishers

Hamilton County, Indiana

Hamilton County had 379,704 residents in the Census Vintage 2024 estimate, on 394.4 square miles of land. It ranks 4th of 92 in Indiana by population and 50th by land area.

Population
379,704
#4 of 92 in Indiana · #201 in US
Area
394.4 sq mi
#50 of 92 in Indiana · #2,553 in US
Density
963 / sq mi
#3 of 92 in Indiana · #168 in US
Median household income
$121,231
#1 of 92 in Indiana · #35 in US

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

Hamilton County within Indiana. Pin: Indianapolis.

Measure from here

Tools and pages that start from Hamilton County

Hamilton County population, land area and income

Hamilton County had 379,704 residents in the Census Vintage 2024 estimate, on 394.4 square miles of land. It ranks 4th of 92 in Indiana by population and 50th by land area. That works out to 962.8 people per square mile, 10.0 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Indiana has 34,874 residents, so Hamilton County is 10.9 times that size.

Its SAIPE 2023 median household income of $121,231 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

379,704

3144th1st

201st of 3,144 (US)

Land area

394 sq mi

3144th1st

2553rd of 3,144 (US)

Density

962.8 / sq mi

3144th1st

168th of 3,144 (US)

Median household income

$121,231

3143rd1st

35th of 3,143 (US)

Rank within Indiana (92)

Population

379,704

92nd1st

4th of 92 (IN)

Land area

394 sq mi

92nd1st

50th of 92 (IN)

Density

962.8 / sq mi

92nd1st

3rd of 92 (IN)

Median household income

$121,231

92nd1st

1st of 92 (IN)

How Hamilton County's population changed since 2020

Hamilton County gained 30,673 residents between the July 2020 and July 2024 estimates, a rise of 8.8%. That ranks 3rd 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, Hamilton County recorded 16,461 births and 10,026 deaths, a natural change of +6,435. Net international migration added +7,686 and net domestic migration, people moving to or from other US counties, came to +18,260. The largest single component was domestic migration, which added 18,260 people.

349.0k2020357.7k2021366.3k2022372.6k2023379.7k2024
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
16,461
Deaths
10,026
Net international migration
+7,686
Net domestic migration
+18,260
Change, July 2023 to July 2024
+7,116

Where Hamilton County is

The Census internal point of Hamilton County is at 40.053500, -86.021700. 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 Hamilton 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: Hamilton County internal point. Dark pin: Indianapolis.

Internal point

Decimal
40.053500, -86.021700
DMS
40°03'12.60"N 86°01'18.12"W
UTM
16N 583442.9E 4434153.7N
Geohash
dp4gfe8bt
Plus code
86GM3X3H+98

Towns in Hamilton County

7 incorporated places of 1,000+ people have residents in Hamilton County, 356,383 people together, or 94% of the county. Each figure counts only the part of the town inside Hamilton County; towns marked "part" extend into another county. The largest is Fishers with 103,986.

  1. 01Fishers103,986
  2. 02Carmel103,606
  3. 03Noblesville75,239
  4. 04Westfield62,994
  5. 05Cicero5,607
  6. 06Sheridan3,487
  7. 07Arcadia1,464
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Hamilton County

The Census 2024 county adjacency file lists 6 neighbors for Hamilton County. The most populous is Marion County, IN, with 981,628 residents. Distances run between Census internal points in a straight line.

Distance to Indianapolis and the nearest big city

Indianapolis is 20.9 miles SSW of Hamilton County's internal point in a straight line. The nearest place of 100,000 or more is Fishers, IN (population 103,986), 7.0 miles away. The nearest place of 10,000 or more is Noblesville, IN (population 75,239), 1.4 miles away.

Hamilton County FIPS code

The FIPS code of Hamilton County is 18057: state code 18 for Indiana plus county code 057. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $121,231.

Questions people ask

What is the population of Hamilton County, Indiana?

The Census Vintage 2024 estimate for July 1, 2024 is 379,704. That is up 30,673 people (8.8%) from the July 2020 estimate of 349,031.

What is the FIPS code of Hamilton County?

18057. The first two digits (18) are Indiana; the last three (057) identify the county.

What is the largest town in Hamilton County?

Fishers, with 103,986 residents inside Hamilton County in 2024.

Which counties border Hamilton County?

6 county-equivalents border it in the Census 2024 adjacency file: Marion County, IN; Madison County, IN; Hancock County, IN; Boone County, IN; Clinton County, IN; Tipton County, IN.

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.