John Henthorn/Hinthorn married Margaret Downard about 1776. The two moved to Ohio at some point, lived a long life and died in Licking County, Ohio; John 19 Nov 1820, his loving wife Mary 6 Nov 1827.
All the sources I've seen (Only sources on the Internet, I admit) agree on those facts. However, opinion is divided on some other things.
Was John born in Frederick County Virginia, Frederick County Maryland, or Pennsylvania?
His wife, Margaret Downard, is born in 1752 in Ohio on a lot of sources. The first permanent (European) settlement in Ohio was Marietta, founded in 1788. Either colonists were sneaking across the river 36 years ahead of time, or she was at least half Indian, or someone made a mistake and a lot of people copied it. Any thoughts?
Their children are shown born in Pennsylvania, Ohio, Virginia and West Virginia. If John and Margaret settled in that little spit of Virginia (Now WV) that sticks up between Ohio and Pennsylvania, then moved west after the kids were born, that might explain the confusion. It still doesn't forgive anyone who puts "West Virginia" as a state before 1863.
Here are the children, gleaned primarily from the LDS sources and RootsWeb World Connect. I realize neither is infallible.
1 M William H. Hinthorn Birth: 16 Nov 1777Pennsylvania Death: 10 Nov 1860McLean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-NV Spouse: Nancy Fisher (m 31 Jul 1822)
2 F Mary Hinthorn Birth: 17 Aug 1780Virginia Death: 25 Oct 1848Licking County, Ohio Burial:Evans Cem, Saint Louisville, Licking, Oh AFN:Q50K-P2 Spouse: George W. D. Archer(m 23 Sep 1801)
3 M Isaac Hinthorn Birth: 12 Mar 1783Virginia Death: 15 Dec 1848McLean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-Q7 Spouse: Hannah Wilson (m 8 Sep 1808) Spouse: Margaret Moats (m 17 Oct 1820)
4 F Rebecca Hinthorn Birth: 18 Sep 1785Virginia Death: 18 Feb 1864McLean County, Illinois Burial:West Hudson Cem, Hudson Township, Mclean, Il AFN:Q50K-RD Spouse: Jesse Havens (m 19 Sep 1805)
5 M John Hinthorn Birth: 1787 Death: 1837McLean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-SK Spouse: Elizabeth Carter (m 5 Feb 1818)
6 F Sarah Hinthorn Birth: 4 May 1790 Death: 16 Jul 1873McLean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-TQ Spouse: Jacob Moats (m 17 Dec 1809)
7 M Stephen Downard Hinthorn Birth: 19 Nov 1792Virginia Death: 19 Dec 1838McLean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-VW Spouse: Nancy Neighbarger (m 25 Aug 1825)
8 M Adam Hinthorn Birth: 17 Apr 1794 Death: 13 Sep 1857Hudson Township, Mclean County, Illinois Burial:Hinthorn Cem, Money Creek Twp, McLean, Il AFN:Q50K-W3 Spouse: Cerena Patrick (m 28 Mar 1833)