Unison is an unincorporated village in Loudoun County, Virginia, United States.
In 1813 Virginia's General Assembly chartered the village as the Town of Union. That same year the federal government established the Union Post Office, discontinued twice in its early years, from 1820 to 1824, and in 1828. The post office was reestablished in 1829 under Union's new name of Unison which was forced on the town largely because Monroe Court House in Monroe County, Virginia had taken the name Union a few years prior, even though its own post office had been established 4 years after Loudoun's Union post office. Unfortunately for Loudoun's Union, Monroe County got preferred treatment because their courthouse was situated in their town of Union.
By the 1830s Unison was the 4th largest town in Loudoun County. Yardley Taylor, writing for Joseph Martin's Gazetteer of Virginia in 1835, used the old name "Union" to identify Unison and counted 25 dwellings, 3 houses of worship, a school, 2 general stores, a blacksmith, and a tavern. Among the 135 inhabitants there were a number of professionals including a lawyer and 3 physicians.
In 2001 the vacant Unison Store building was being considered by a buyer as a tear down. This news prompted a local gathering of residents to attempt to save the building. They formed a 501[c]3 non-profit group, incorporated as "The Unison Preservation Society", their stated goal to help protect and preserve the historic village and surrounding countryside of Unison. As a result of their efforts Unison was placed on the Virginia Landmarks Register in 2002 as the Unison Historic District, and on the National Register of Historic Places in 2003. The store was purchased at highest bid by a local business at a public auction in 2001, and the building subsequently renovated. It was used as an office business until April 2013 when the building was again sold. It was purchased this time by a local philanthropist, Dr. Betsee Parker, owner of Huntlands, who then gifted the building to the Unison Preservation Society.
On Sept. 22, 2011, due to the successful efforts of the Unison Preservation Society's research and documentation into the important historical significance of the battles and skirmishes that took place in and around the Unison area, Virginia added further buildings and acreage to the Virginia Landmarks register and nominated the 8,000-acre Unison Battlefield Historic District for inclusion on the National Register of Historic Places.
The population count of Unison is now about 30, greatly outnumbered by the horses in the surrounding farms. The village contains a single United Methodist Church, and a number of private home businesses.