The 2020 United States census places Warren County within the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area with a population of 40,727.

The Iroquois formally sold their entire claim east of the Alleghenies to the Virginia Colony at the Treaty of Lancaster in 1744.

[4]: 289  Wedding records show marriages of people born in the 1770s marrying in the 1800s who head households of four to eight "free colored" so the early demographics of the population are unclear.

This line was soon extended to Strasburg in time to become a factor in the Battle of Front Royal on May 23, 1862, and throughout the Civil War.

Lumber, agriculture, manufacturing and grain mills provided employment in the region for decades after the Civil War.

[8]: 368  On September 23, 1864, William Thomas Overby and five others of then Lt. Col. John S. Mosby's 43rd Virginia Battalion of Partisan Rangers were captured by cavalry troops under the command of then Brig.

[9] In 2017, questions were raised about the validity of an alleged $40 million economic development deal that had been brought to the community by Curt Tran, the owner of a company called IT Federal, over the redevelopment of the Avtex Superfund site.

[10] In 2018, Warren County Economic Development Authority executive director Jennifer McDonald was charged with filing false police reports about an alleged rock-throwing incident that she claimed had occurred at her home.

[11] In 2019, McDonald and other parties were embroiled in a massive financial scandal that some observers have characterized as the largest embezzlement scheme in the history of the state of Virginia.

For many years, Avtex Fibers (formerly known as the American Viscose Corporation from 1910 to 1976), was the county's largest employer and taxpayer.

The purpose of the WCEDA is to foster and stimulate industry and economic development within Warren County and the town of Front Royal.