Indiana counties are 92 in total and each county serves as the local level of government within its borders.
As of 2019, Indiana’s population was 6.732 million and the most populous county is Marion County with a population of 964,582. The least populous county is Ohio County with a population of 5,875.
The largest county in Indiana by area is Allen County which covers 657 square miles while the smallest county by area is Ohio County which covers 86 square miles.
Table of Contents
Indiana Counties – List of Counties in Indiana (in Alphabetical Order)
|County||County Seat||Year Established||Population (2019)|
|Allen County||Fort Wayne||1823||379,299|
|Blackford County||Hartford City||1838||12,013|
|Floyd County||New Albany||1819||78,522|
|Henry County||New Castle||1821||47,972|
|Lake County||Crown Point||1837||485,493|
|Ohio County||Rising Sun||1844||5,875|
|Perry County||Tell City||1814||19,102|
|Posey County||Mount Vernon||1814||25,427|
|St. Joseph County||South Bend||1830||271,826|
|Vigo County||Terre Haute||1818||107,038|
|Whitley County||Columbia City||1835||33,964|
Top 10 Most Populous Counties in Indiana
Marion County, home of Indianapolis, is the most populous Indiana County which as of 2019 had an estimated population of 964,582.
It was April 1, 1822, and named for Francis Marion a military officer who served in the American Revolution war (1775-1783).
2. Lake County
As of 2019, Lake County’s population was 485,493, making it the second-most populous county in Indiana. Its county seat is Crown Point.
Lake County is part of Northwest Indiana and the Chicago Metropolitan Area as well as contains a mix of urban, suburban, and rural areas.
The county was established February 16, 1837 and named for Lake Michigan.
3. Allen County
Allen County’s population was estimated to be 379,299 in 2019, making it the third-most populous Indiana County. Its county seat and largest city is Fort Wayne which is the second-largest city in Indiana.
Allen County was established April 1, 1824, and was named for John Allen a U.S. politician and army officer who was killed in the war of 1812.
Hamilton County was founded in 1823 and named for Alexander Hamilton, one of the founding fathers of the United States.
It is the fourth most populous county in Indiana with an estimated population of 338,011 and the second-most populous county in Central Indiana.
This county is commonly known as St. Joe County. It is the fifth most populous county in Indiana with a population of 271,826 (as of 2019).
St. Joseph County was founded in 1830 and was named for the St. Joseph River which flows through it to Lake Michigan.
Elkhart County’s population as of 2019 was 206,341, making it the sixth most populous county in the U.S. state of Indiana.
It is part of the Elkhart-Goshen Metropolitan Statistical Area. Its county seat is Goshen and its largest city is Elkhart.
This county is located in the west central part of Indiana approximately 22 miles east of the Illinois state line.
Tippecanoe County is the seventh most populous county in the U.S. state of Indiana with an estimated population of 195,732 inhabitants.
It was formed in 1826 and named for “Kethtippecanoogi” – a Miami people term which means a “place of the Succor Fish People”.
Its county seat and largest city is Lafayette.
Vanderburgh County’s population as of 2019 was 181,451, making it the eighth most populous county in Indiana.
It was formed January 7, 1818 and named for Henry Vanderburgh an American military officer and jurist (1760 -1812).
Its county seat and largest city is Evansville.
Porter County was established on February 7, 1835, and was named for David Porter. It is the ninth most populous county in the U.S state of Indiana with an estimated population of 170,389.
Porter County is also part of Northwest Indiana and the Chicago Metropolitan area. Its county seat is Valparaiso while its largest city is Portage.
10. Hendricks County
Hendricks County is the tenth most populous county in Indiana with a population of 170,311 (as of 2019). Its county seat is Danville and largest town Plainfield.
It was formed on the 20th of December 1823 and named for William Hendricks – a Democratic-Republican member of the House of Representatives (1816-1822), third governor of Indiana (1822-1825, and an Anti-Jacksonian member of the U.S. Senate ( 1825-1837).
The list above clearly shows the 92 Indiana Counties with the most populous being Marion County (with 964,582 inhabitants) and the least populous Ohio County (with 5,875 inhabitants).