Kegley 1980:307 identifies a David Porter owning land in Botetourt County in 1788, on Little River, and again in 1799 (p319). Little River is SE of Radford, running SE-NW into the New River at the Claytor Lake Dam. The following from Descendants of Joshua Howell, ephemeral Website identifies a David Porter in this same area as marrying the daughter of Joshua Howell. Joshua Howell also lived on the Little River. Little River is formed from three main forks: West Fork, Howell Creek (Middle) and Dodds Creek (east fork). Most likely South Fork corresponds to Howell's Creek, and it is probably along this stream that Joshua Howell and David Porter both lived, or reasonably close to it. The modern community of "Floyd" is about 5 miles east of Howell's Creek.
1. Joshua1 HOWELL; born 1745;  married Mary ? circa 1765.
A single family tree on Ancestry identifies David who married Abigail Howell, as the son of a William Porter (1745-1787) and Mary McKay, but gives no further information about Williams parents.
WVA Genealogy Data Warrants from RW and Records and Pension and bounty lands....David Porter lived in Guyan Ohio in 1816 in 1828 he moved to Muncie IN. He was born in Christianburg VA Md Abigail
David is listed on1830 census for Lawrence county Ohio..the above book said he was in IN in 1828? Maybe he came back to Ohio for a short while. According to a family history from his daughter Priscilla's line David died in Muncie IN abt 1840
He was listed in Lawrence co on 1818 and 1821 tax list also the 1820 census in Union twp Lawrence co Ohio
Further evidence show him still alive in 1850 living with his daughter and son in law John and Sarah Porter Keen
Listed on Tax Records/Personal Property Lawrence Co., Ohio 1826/1827
Unsourced information from Carl Murdock--Miscellaneus postings on GenForum in various lists; presented as an interim measure:
Early Porters in Montgomery co
Source not stated:
Executor William Porter Jr., Mary's brother = Mary Bowen. Children of William Porter Sr. per his will
____ Apparently from "Dictional (sic) of American Biography", by Virkus volume 7, page 30, and information from Bertini Talbot, as collectd by Newell Joyner, deceased." I believe that this was referring to "the Compendium of American Biography", a seven volume set published between 1928 and 1936 by Frederick A. Virkus Company. "Dictionary of American Biography" is a similar work.
The following suggests that when David Porter relocated ultimately to Indiana, he moved along with several of his fatherinlaws children or relations
From Nuck141 Notes
[NI54630] Record Book 24, Page 262 — Filed 18 December 1850 — In Chancery Isaac N. Shidler vs John Howell & Others Lot Number 28 in Addison was sold 8 February 1832 to Jonathan Ruggles, who in turn sold it on 31 May 1834 to Abiel Smith. Smith sold the land on 12 July 1847 tot Isaac N. Shidler; Shidler sold it 29 March 1849 to John W. Matthews; Matthews re—sold it 23 October 1849 to Shidler. The original deed was in error. The persons named within the suit: John Howell of Indiana; Jeremiah Howell deceased, father of Mary Deweese, Elizabeth McGinnis, Rhoda Ann Custar and others, all of Indiana; James Howell, deceased, father of N. Hamilton Howell, Johnston Howell, Lemuel Howell, John Howell, George S. Howell of Indiana, David Howell of Virginia, Nancy Howell married . .. Hannah, Abigail Howell married David Porter of Indiana, Joshua Howell of Michigan and Daniel Howell of Champaign County; and Thomas Howell, deceased.