Fayetteville is a city in Washington County, Arkansas, United States, and its county seat. The population was 93,949 at the 2020 census, and was estimated at 106,623 in 2025, making it the second-most populous city in Arkansas and the most populous city in Northwest Arkansas. Fayetteville is on the outskirts of the Boston Mountains, within the Ozarks. It is included in the three-county Northwest Arkansas metropolitan area, with 546,725 residents in 2020.