From page 9 of the Atlas of Indiana by Robert C. Kingsbury

Adams
County Seat: Decatur
Date Established: 1836
Allen
County Seat: Fort Wayne
Date Established: 1824
Bartholomew
County Seat: Columbus
Date Established: 1821
Benton
County Seat: Parish Grove
Date Established: 1838
County Seat: Oxford
Date Established: 1843
County Seat: Fowler
Date Established: 1874
Blackford
County Seat: Hartford City
Date Established: 1840
Boone
County Seat: Jamestown
Date Established: 1930
County Seat: Lebanon
Date Established: 1832
Brown
County Seat: Nashville
Date Established: 1836
Original Town Name when designated county seat: Jacksonburg
Carroll
County Seat: Delphi
Date Established: 1821
Original Town Name when designated county seat: Carrollton
Cass
County Seat: Logansport
Date Established: 1829
Clark
County Seat: Jeffersonville
Date Established: 1802, 1873
County Seat: Charlestown
Date Established: 1810
Clay
County Seat: Bowling Green
Date Established: 1825
County Seat: Brazil
Date Established: 1877
Clinton
County Seat: Jefferson
Date Established: 1830
County Seat: Frankfurt
Date Established: 1831
Crawford
County Seat: Mt. Sterling
Date Established: 1818
County Seat: Leavenworth
Date Established: 1843
County Seat: English
Date Established: 1894
Daviess
County Seat: Washington
Date Established: 1817
Original Town Name when designated county seat: Liverpool
Dearborn
County Seat: Lawrenceburg
Date Established: 1803
Decatur
County Seat: Greensburg
Date Established: 1822
DeKalb
County Seat: Auburn
Date Established: 1837
Delaware
County Seat: Muncie
Date Established: 1827
Original Town Name when designated county seat: Munseytown
DuBois
County Seat: Portersville
Date Established: 1818
County Seat: Jasper
Date Established: 1830
Elkhart
County Seat: Dunlap
Date Established: 1830
County Seat: Goshen
Date Established: 1831
Fayette
County Seat: Connersville
Date Established: 1819
Floyd
County Seat: New Albany
Date Established: 1819
Fountain
County Seat: Covington
Date Established: 1826
Franklin
County Seat: Brookville
Date Established: 1811
Fulton
County Seat: Rockester
Date Established: 1836
Gibson
County Seat: Princeton
Date Established: 1813
Grant
County Seat: Marion
Date Established: 1831
Greene
County Seat: Burlington
Date Established: 1821
County Seat: Bloomfield
Date Established: 1824
Hamilton
County Seat: Noblesville
Date Established: 1823
Hancock
County Seat: Greenfield
Date Established: 1828
Harrison
County Seat: Corydon
Date Established: 1808
Hendricks
County Seat: Danville
Date Established: 1824
Henry
County Seat: New Castle
Date Established: 1822
Howard
County Seat: Kokomo
Date Established: 1844
Huntington
County Seat: Huntington
Date Established: 1834
Jackson
Vallonia
Date Established: 1816
County Seat: Seymour
Date Established: 1816
Jasper
County Seat: Renesselear
Date Established: 1839
Jay
County Seat: Portland
Date Established: 1836
Jefferson
County Seat: Madison
Date Established: 1811
Jennings
County Seat: Vernon
Date Established: 1817
Johnson
County Seat: Franklin
Date Established: 1823
Knox
County Seat: Vincennes
Date Established: 1790
Kosciusko
County Seat: Warsaw
Date Established: 1837
LaGrange
County Seat: Howe
Date Established: 1832
Original Town Name when designated county seat: Lima
County Seat: Lagrange
Date Established: 1844
Lake
County Seat: Crown Point
Date Established: 1838, 1839
Original Town Name when designated county seat: 1838 Lake Co. Court House
County Seat: Liverpool
Date Established: 1838
LaPorte
County Seat: LaPorte
Date Established: 1832
Lawrence
County Seat: Palestine
Date Established: 1818
County Seat: Bedford
Date Established: 1825
Madison
County Seat: Pendleton
Date Established: 1823
County Seat: Anderson
Date Established: 1828
Original Town Name when designated county seat: Andersontown
Marion
County Seat: Indianapolis
Date Established: 1822
Marshall
County Seat: Plymouth
Date Established: 1836
Martin
County Seat: Hindostan
Date Established: 1820
County Seat: Mt. Pleasant
Date Established: 1822?
County Seat: Shoals
Date Established: 1844
Original Town Name when designated county seat: Memphis
County Seat: Harrisonville
Date Established: 1844
County Seat: Dover Hill
Date Established: 1845
County Seat: Shoals
Date Established: 1869
Miami
County Seat: Miamisport
Date Established: 1834
County Seat: Peru
Date Established: 1841
Monroe
County Seat: Bloomington
Date Established: 1818
Montogomery
County Seat: Crawfordsville
Date Established: 1823
Morgan
County Seat: Martinsville
Date Established: 1822
Newton
County Seat: Spitler
Date Established: 1838
County Seat: Kentland
Date Established: 1859
Noble
County Seat: Sparta
Date Established: 1836
County Seat: Port Mitchell
Date Established: 1844
County Seat: Albion
Date Established: 1846
Ohio
County Seat: Rising Sun
Date Established: 1844
Orange
County Seat: Paoli
Date Established: 1816
Owen
County Seat: Lancaster
Date Established: 1819
County Seat: Spencer
Date Established: 1820
Parke
County Seat: Armiesburg
Date Established: 1821
County Seat: Rockville
Date Established: 1823
Perry
County Seat: Troy
Date Established: 1814
County Seat: Rome
Date Established: 1819
County Seat: Cannelton
Date Established: 1859
County Seat: Tell City
Date Established: 1995?
Pike
County Seat: Petersburg
Date Established: 1817
Porter
County Seat: Valparaiso
Date Established: 1836
Original Town Name when designated county seat: Portersville
Posey
County Seat: Blackford
Date Established: 1814
County Seat: Springfield
Date Established: 1817
County Seat: Mt. Vernon
Date Established: 1825
Pulaski
County Seat: Winamac
Date Established: 1840
Putnam
County Seat: Greencastle
Date Established: 1822
Randolph
County Seat: Winchester
Date Established: 1818
Ripley
County Seat: Marion
Date Established: 1818
County Seat: Versailles
Date Established: 1819
Rush
County Seat: Rushville
Date Established: 1822
St. Joseph
County Seat: St. Joseph
Date Established: 1830
County Seat: South Bend
Date Established: 1831
Scott
County Seat: Lexington
Date Established: 1820
County Seat: Scottsburg
Date Established: 1871
Shelby
County Seat: Shelbyville
Date Established: 1822
Spencer
County Seat: Rockport
Date Established: 1818
Starke
County Seat: Knox
Date Established: 1850
Steuben
County Seat: Angola
Date Established: 1837
Sullivan
County Seat: Carlisle
Date Established: 1817
County Seat: Meron
Date Established: 1819
County Seat: Sullivan
Date Established: 1843
Switzerland
County Seat: Vevay
Date Established: 1814
Tippecanoe
County Seat: Lafayette
Date Established: 1826
Tipton
County Seat: Tipton
Date Established: 1844
Original Town Name when designated county seat: Tiptontown
Union
County Seat: Brownsville
Date Established: 1821
County Seat: Liberty
Date Established: 1823
Vanderburgh
County Seat: Evansville
Date Established: 1818
Vermillion
County Seat: Newport
Date Established: 1824
Vigo
County Seat: Terre Haute
Date Established: 1818
Wabash
County Seat: Wabash
Date Established: 1835
Warren
County Seat: Warrentown
Date Established: 1827
County Seat: Williamsport
Date Established: 1829
Warrick
County Seat: Evansville
Date Established: 1813
County Seat: Darlington
Date Established: 1814
County Seat: Boonville
Date Established: 1818
Washington
County Seat: Salem
Date Established: 1824
Wayne
County Seat: Centerville
Date Established: 1811
Original Town Name when designated county seat: Salisbury
County Seat: Richmond
Date Established:1873
Wells
County Seat: Bluffton
Date Established: 1837
White
County Seat: Monticello
Date Established: 1834
Whitley
County Seat: Columbia City
Date Established: 1839
Original Town Name when designated county seat: Columbia

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