Kentucky

Adair formed 11 Dec 1801 from Green; Russell (1825) and Metcalfe (1860) formed from it. Toward Tennessee, 1 county up, above Cumberland

Allen formed 1815 from Barren and Warren Counties; Simpson (1819) formed from it.

Anderson formed 16 Jan 1827 from Franklin, Mercer, Washington

Ballard formed 15 Feb 1842 from Hickman and McCracken; Carlisle formed from it in 1886
1850 census - online thanks to Bob Kipke

Barren formed 20 Dec 1798 from Warren and Green; Allen 1798, Hart 1819, Monroe 1820 and Metcalfe 1860 formed from it.

Bath formed 15 Jan 1811 from Montgomery; Morgan 1822 and Menifee 1869 formed from it.

Bell formed 1867 from Knox and Harlan Counties.

Boone formed 13 Dec 1798 from Campbell.

Bourbon formed 17 Oct 1785 from Fayette; Mason 1788, Clark 1792, Harrison 1793, Nicholas 1799 formed from it

Boyd formed 16 Feb 1860 from Carter, Lawrence and Greenup.

Boyle formed 15 Feb 1842 from Lincoln and Mercer

Bracken formed 14 Dec 1796 from Campbell and Mason Counties.Pendleton 1797, Meade 1823, Robertson 1867 formed from it.On Ohio River, 2 counties east of Cincinnati.

Breathitt formed 13 Dec 1796 from Estil, Clay, Perry; Owsley 1843, Wolfe 1860, Lee 1873, Knott 1884 formed from it.

Breckinridge formed 9 Dec 1799 from Hardin; Meade 1823, Hancock 1829 formed from it.

Bullitt formed 13 Dec 1796 from Jefferson, Nelson; Spencer 1824 formed from it.

Butler formed 18 Jan 1810 from Logan and Ohio.

Caldwell formed 31 Jan 1809 from Livingston County; Trigg (1820), Hickman (1821) and Lyon (1854) formed from it

Calloway formed 19 Dec 1821 from Hickman; Marshall 1842 formed from it.

Campbell formed 17 Dec 1794 from Scott, Harrison and Mason Counties; Bracken (1796), Boone (1798) and Kenton (1840) formed from it.

Carlisle formed 3 April 1886 from Ballard.

Carroll formed 9 Feb 1838 from Gallatin, Henry and Trimble

Carter formed 9 Feb 1838 from Greenup and Lawrence; Boyd 1860 and Elliott 1869 formed from it.

Casey formed 14 Nov 1806 from Lincoln. Pretty central.

Christian formed 13 Dec 1796 from Logan; Henderson, Livingston, Muhlenburg Counties formed from it in 1798; Todd (1819) and Trigg (1820) also formed from it. On Tennessee border, toward the west.

Clark formed 6 Dec 1792 from Bourbon, Fayette; Montgomery 1796, Estill 1808, Powell 1852 formed from it.

Clay formed 2 Dec 1806 form Madison, Knox, Floyd; Pendleton 1787, Breathitt 1796, Clay 1820, Laurel 1825, Owsley 1843, Jackson 1858, Leslie 1878 formed from it.

Clinton formed 20 Feb 1836 from Wayne and Cumberland Counties. On Tennessee border, sort of central.

Crittenden formed 26 Jan 1842 from Livingston.

Cumberland formed 14 Dec 1798 from Green; Wayne (1800), Monroe (1820), Russell (1825), Clinton (1836) and Metcalfe (1860) formed from it. On Tennessee border, pretty central.

Daviess formed 14 Jan 1815 from Ohio; Hancock (1829) and McLean (1854) formed from it. On Ohio River, just south of Warrick County, Indiana.

Edmonson formed 12 Jan 1869 from Hart, Grayson, Warren.

Elliott formed 27 Jan 1869 from Lawrence, Morgan, Carter.

Estill formed 27 Jan 1808 from Madison and Clark; Pendleton 1787, Breathitt 1796, Owsley 1843, Powell 1852, Jackson 1858, Lee 1873 formed from it.

Fayette formed 1 May 1780 from Kentucky County (which was originally part of Virginia; Kentucky County was divided up into the first three Kentucky Counties: Fayette, Jefferson, and Lincoln.) Woodford (1788), Clark (1792), Bourbon (1798) and Jessamine (1798) formed from it. Centralish. Lexington is in this county.

Fleming formed 10 Feb 1798 from Mason; Floyd (1799) and Rowan (1856) formed from it. 1 county south of river; south of Mason.

Floyd formed 13 Dec 1799 from Fleming, Mason, Montgomery; Clay 1806, Perry 1820, Pike and Lawrence 1821, Johnson 1843, Magoffin 1860, Martin 1870, Knott 1884 formed from it.

Franklin formed 7 Dec 1794 from Woodford, Mercer and Shelby Counties; Gallatin (1798), Owen (1819) and Anderson (1827) formed from it. Not on river. Frankfort in this county.

Fulton formed 15 Jan 1845 from Hickman.

Gallatin formed 14 Dec 1798 from Franklin and Shelby Counties; Owen (1819), Trimble (1837) and Carroll (1838) formed from it. On Ohio River, across from Switzerland County, Indiana.

Garrard formed 17 Dec 1796 from Madison, Lincoln and Mercer Counties. Pretty central

Grant formed 12 Feb 1820 from Pendleton

Graves formed 19 Dec 1821 from Hickman

Grayson formed 25 Jan 1810 from Hardin and Ohio Counties; Edmonson (1869) formed from it. Fairly central; 1 county down from river. (lots of Deweeses here)

Green formed 20 Dec 1792 from Lincoln and Nelson; Barren, Cumberland, Pulaski 1798, Adair 1801, Taylor 1848, Metcalfe 1860 formed from it.

Greenup formed 12 Dec 1803 from Mason; Lawrence (1821), Carter (1838), and Boyd (1860) formed from it. On the Ohio River up near West Virginia.

Hancock formed 3 Jan 1829 from Breckenridge, Ohio, and Daviess Counties. On the Ohio River, east of Daviess County.

Hardin formed 1792 from Nelson; Mercer (1785), Ohio (1798), Breckenridge (1799), Grayson (1810), Hart (1819) and LaRue (1843) formed from it.

Harlan formed 21 Dec 1819 from Knox; Letcher (1842), Bell (1867) and Leslie (1878) formed from it.

Harrison formed 21 Dec 1793 from Bourbon and Scott; Campbell 1794, Robertson 1867 formed from it.

Hart formed 28 Jan 1819 from Hardin and Barren Counties; Edmonson (1869) formed from it.

Henderson formed 21 Dec 1798 from Christian; Wayne (1800), Hopkins (1806), Union (1811) and Webster (1860) formed from it. On the Ohio River, right across from Evansville, Indiana (Vanderburgh County).

Henry formed 14 Dec 1798 from Shelby; Oldham 1823, Trimble 1827, Carroll 1838 formed from it.

Hickman formed 19 Dec 1821 from Caldwell and Livingston; Calloway, Graves 1821, McCracken 1824, Ballard 1842, Fulton 1845 formed from it.

Hopkins formed 9 Dec 1806 from Henderson; Wayne 1800, Webster 1860 formed from it.

Jackson formed 2 Feb 1858 from Madison, Owsley, Rockcastle, Clay, Estill and Laurel Counties.

Jefferson formed 1 May 1780 from Kentucky County; Nelson (1784), Shelby (1792), Bullett (1796) and Oldham (1823) formed from it. Louisville is in this county.

Jessamine formed 19 Dec 1798 from Fayette. Central; southwest of Lexington.

Johnson formed 24 Feb 1843 from Lawrence, Floyd, Morgan; Magoffin 1860, Martin 1870 formed from it.

Kenton formed 29 Jan 1840 from Campbell. On the Ohio River, directly across from Cincinnati.

Kentucky (originally part of Kentucky County, VA, and was later divided into the first three counties of Kentucky) formed 1776 from Fincastle Co, VA; Fayette, Lincoln, Jefferson formed from it in 1780.

Knox formed 19 Dec 1825 from Lincoln; Clay (1806), Rockcastle (1810), Whitley (1818), Harlan (1819), Laurel (1825) and Bell (1867) formed from it. East side of state, down toward Tennessee.

LaRue formed 4 March 1843 from Hardin.

Laurel formed 12 Dec 1825 from Rockcastle, Knox, Clay, Whitley; Jackson formed from it in 1856.

Lawrence formed 14 Dec 1821 from Floyd and Greenup Counties; Carter (1838), Johnson (1843), Boyd (1860), Elliott (1869), and Mason (1870) formed from it. Over by West Virginia.

Lee formed 29 Jan 1873 from Owsley, Breathitt, Estill, and Wolf.

Leslie formed 22 March 1878 from Clay, Harlan and Perry.

Letcher formed 3 March 1842 from Harlan and Perry; Knott formed from it in 1884.

Lewis formed 2 Dec 1806 from Mason.

Lincoln formed 1 May 1780 from Kentucky County; Madison and Mercer (1785), Green and Logan (1792), Garrard (1796), Pulaski (1798), Casey (1806), Rockcastle (1810), Knox (1825) and Boyle (1842) formed from it.

Livingston County formed 13 Dec 1798 from Christian County; Caldwell (1809), Hickman (1821), Crittenden (1842) formed from it.

Logan formed 28 June 1792 from Lincoln; Warren and Christian formed from it in 1796; Muhlenburg (1798), Butler (1810), Todd and Simpson (1819) formed from it. On Tennessee border, next to Christian.

Lyon formed 14 Jan 1854 from Caldwell

Madison formed 17 Oct 1785 from Lincoln; Garrard (1796), Nicholas (1799), Clay (1806), Estill (1808), Rockcastle (1810) and Jackson (1858) formed from it. Central. South of Lexington.

Magoffin formed 22 Feb 1860 from Floyd, Johnson, and Morgan.

Marion formed 1834 from Washington.

Marshall formed 12 Feb 1842 from Calloway.

Martin formed 10 March 1870 from Johnson, Pike, Floyd and Lawrence.

Mason formed 5 Nov 1788 from Bourbon; Campbell (1794), Bracken (1796), Fleming (1798), Floyd (1799), Greenup (1803), Lewis (1806) and Robertson (1867) formed from it. On the Ohio River, 3 counties east of Cincinnati.

McCracken formed 17 Dec 1824 from Hickman; Ballard (1842) formed from it. On the Ohio River, east of Ballard.

McCreary formed 17 Dec 1824 from Pulaski, Wayne and Whitley Counties.

McLean formed 6 Feb 1854 from Daviess, Ohio and Muhlenburg.

Meade formed 17 Dev 1823 from Breckenridge and Bracken.

Menifee formed 10 March 1869 from Bath, Montgomery and Morgan.

Mercer formed 17 Oct 1785 from Hardin and Lincoln; Franklin 1794, Garrard 1796, Anderson 1827, Boyle 1842 formed from it.

Metcalfe formed 1 Feb 1860 from Adair, Barren, Green and Cumberland.

Monroe formed 19 Jan 1820 from Barren and Cumberland.

Montgomery formed 14 Dec 1796 from Clark; Floyd 1799, Bath 1811, Powell 1852, Menifee 1869 formed from it.

Morgan formed 7 Dec 1822 from Bath; Rowan 1856, Magoffin and Wolfe 1860, Elliott and Menifee 1869 formed from it.

Muhlenburg formed 14 Dec 1798 from Christian and Logan; McLean 1854 formed from it.

Nelson formed 1784 from Jefferson; Green, Hardin and Washington (1792), Bullitt (1796) and Spencer (1824) formed from it. 2 counties south of Louisville.

Nicholas formed 18 Dec 1799 from Bourbon and Madison; Robertson 1867 formed from it.

Ohio formed 17 Dec 1798 from Hardin; Butler and Grayson 1810, Daviess 1815, Hancock 1829, and McLean 1854 formed from it.

Oldham formed 1823 from Jefferson, Shelby and Henry Counties; Trimble 1837 formed from it. On the Ohio River, east of Louisville.

Owen formed 6 Feb 1819 from Scott, Gallatin, Franklin and Pendleton Counties. 1 county south of river, by the hump.

Owsley formed 23 Jan 1843 from Clay, Estill and Breathitt; Jackson 1859, Powell 1860 and Lee 1873 formed from it.

Pendleton formed 4 Dec 1787 from Clay, Estill, Bracken; Owen 1819, Grand 1820 formed from it.

Perry formed 2 Nov 1820 from Clay and Floyd; Breathitt 1796, Letcher 1842, Leslie 1878, Knott 1884 formed from it.

Pike formed 19 Dec 1821 from Floyd; Martin (1870) formed from it. East by Virginia & West Virginia.

Powell formed 7 Jan 1852 from Montgomery, Clark, Estill; Wolfe 1860 formed from it.

Pulaski formed 10 Dec 1798 from Lincoln and Green Counties; Wayne (1800), Rockcastle (1810) and McCreary (1824) formed from it. Down toward Tennessee.

Robertson formed 11 Feb 1867 from Nicholas, Harrison, Mason, Bracken.

Rockcastle formed 8 Jan 1810 from Lincoln, Pulaski, Madison, Knox; Laurel 1825, Jackson 1858 formed from it.

Rowan formed 15 March 1856 from Fleming and Morgan.

Russell formed 14 Dec 1825 from Wayne, Adair and Cumberland Counties. Toward Tennessee, SW of Pulaski.

Scott formed 22 Jan 1792 from Woodford; Harrison (1793), Campbell (1794) and Owen (1819) formed from it. Pretty central, not on river, east of Frankfort.

Shelby formed 1792 from Jefferson; Franklin (1794), Gallatin and Henry (1798), Oldham (1803) and Spencer (1824) formed from it. Just east of Louisville, not on river

Simpson formed 28 Jan 1819 from Logan, Warren, Allen.

Spencer formed 7 Jan 1824 from Nelson, Shelby, Breathitt.

Taylor formed 13 Jan 1848 from Green.

Todd formed 30 Dec 1819 from Logan and Christian.

Trigg formed 27 Jan 1820 from Christian and Caldwell.

Trimble formed 9 Feb 1836 from Gallatin, Oldham and Henry Counties; Carroll (1838) formed from it. On the Ohio River, east of Louisville.

Union formed 15 Jan 1811 from Henderson; Wayne (1800) and Webster (1860) formed from it.

Warren formed 14 Dec 1796 from Logan; Barren (1798), Allen (1815), Simpson (1819) and Edmonson (1869) formed from it.

Washington formed 22 June 1792 from Nelson; Anderson 1827, Marion 1834 formed from it.

Wayne formed 18 Dec 1800 from Pulaski, Cumberland, Hopkins, Union and Henderson Counties; McCreary (1824), Russell (1825) and Clinton (1836) formed from it. Tennessee border, east of Clinton County.

Webster formed 29 Feb 1860 from Henderson, Hopkins, Union.

Whitley fomred 17 Jan 1818 from Knos; McCreary 1824 and Laurel 1825 formed from it.

Wolfe formed 5 Mar 1860 from Breathitt, Morgan, Powell, Owsley; Lee 1873 formed from it.

Woodford formed 12 Nov 1788 from Fayette; Scott 1792 and Franklin 1794 formed from it.