Barbour County is a county in north central West Virginia, United States. At the 2020 census, the population was 15,465. The county seat is Philippi, which was chartered in 1844. Both county and city were named for Philip P. Barbour, a U.S. Congressman from Virginia and Associate Justice of the U.S. Supreme Court. The county was formed in 1843 when the region was still part of the state of Virginia. In 1871, a small part of Barbour County was transferred to Tucker County, West Virginia.