Apache County is in the northeast corner of the U.S. state of Arizona. Shaped in a long rectangle running north to south, as of the 2020 census, its population was 66,021. The county seat is St. Johns.

St. Johns is the county seat of Apache County, Arizona, United States. It is located along U.S. Route 180, mostly west of where that highway intersects with U.S. Route 191. As of the 2010 census, the population of the city was 3,480.