Est. in 1846.
Denton County is located in the U.S. state of Texas. As of the 2020 census, its population was 906,422, making it the seventh-most populous county in Texas. The county seat is Denton. The county, which was named for John B. Denton, was established in 1846. Denton County constitutes part of the Dallas–Fort Worth metroplex. In 2007, it was one of the fastest-growing counties in the United States.
Before the arrival of settlers, various Native American peoples, including the Kichai and the Lenape, infrequently populated the area. The area was settled by Peters Colony landowners in the early 1840s. Until the annexation of Texas, the area was considered part of Fannin County. On April 11, 1846, the First Texas Legislature established Denton County. The county was named for John B. Denton, who was killed while raiding a Native American village in Tarrant County in 1841. Originally, the county seat was set at Pinckneyville. This was later changed to Alton, where the Old Alton Bridge currently stands, and then moved finally to Denton.
By 1860, the population of the county had increased to 5,031. On March 4, 1861, residents of the county narrowly voted for secession from the Union, with 331 votes cast for and 264 against. The Missouri–Kansas–Texas Railroad reached Lewisville, located in the southern portion of the county, by the early 1880s. The Denton County Courthouse-on-the-Square was built in 1896, and currently houses various government offices, as well as a museum.