Map - Henry County, Virginia (Henry County)

Henry County is a county located in the U.S. state of Virginia. As of the 2020 census, the population was 50,948. The county seat is usually identified as Martinsville; however, the administration building (where county offices are located and where the board of supervisors holds meetings), county courthouse, and Henry County Sheriff's Office are located on Kings Mountain Road (SR 174) in Collinsville.The Henry County Adult Detention Center is located on DuPont Road in Martinsville.

Henry County is part of the Martinsville, VA Micropolitan Statistical Area.

The county was established in 1777 when it was carved from Pittsylvania County. The new county was initially named Patrick Henry County in honor of Patrick Henry, who was then serving as the first Governor of Virginia, and some of whose relatives had settled in the area. Governor Henry also had a 10000 acre plantation called "Leatherwood plantation" (for Leatherwood Creek) in the newly named county (where he ended up spending 5 years between his third and fourth gubernatorial terms).

In 1785 the northern part of Patrick Henry County was combined with part of Bedford County to form Franklin County. In 1790, Patrick Henry County was split again: the western part became Patrick County and the rest remained Henry County.

Other notable early settlers included: George Waller, Captain George Hairston and Major John Redd, all of whom were present at the surrender of General Cornwallis at Yorktown; Col. Abram Penn, a native of Amherst County, Virginia, who led his Henry County militia troops with the intention of joining General Nathanael Greene at the Battle of Guilford Courthouse during the Revolutionary War; and Brigadier General Joseph Martin, for whom Martinsville is named. Also prominent were Mordecai Hord, a native of Louisa County and explorer, who lived on his plantation called Hordsville; and Col. John Dillard, born in Amherst County, Virginia in 1751, wounded at the Battle of Princeton during the Revolution, and later a member of the Committee of Safety. Captain Robert Hairston, a noted politician in the Colony of Virginia, owned Marrowbone plantation, commanded a militia company and served as Henry County's first high sheriff.

During the War of 1812, the 64th Virginia Militia, under Captain Graves, was formed in 1815 from Henry County. Benjamin Dyer was a lieutenant, then later a captain, of the 5th company of the 64th Virginia Militia.Private Alexander Hunter Bassett would later work large tobacco plantations in the county, and Wyatt Jarrett. Tavner Hailey (b.1793) of Martinsville became an early pioneer in Tennessee and served in the War of 1812. He was 1st Cpl. in Captain Brice Edward's Company, 64th Regiment, Virginia Militia."

During the American Civil War, the 42nd Virginia Infantry was formed in part from Henry County volunteers. Its state senator, Christopher Y. Thomas, owned Henry's former Leatherwood plantation and would later briefly serve in the U.S. House of Representatives after the war. He was succeeded by George Cabell, a Confederate army veteran (38th Virginia Infantry) born in nearby Danville and from a family long prominent in the area.

In 1902, the Henry County Historical Society was incorporated at Martinsville with its first officers being John W. Carter, J. Harrison Spencer and C. B. Bryant.