Sachse is a city in Collin and Dallas counties in the U.S. state of Texas and is part of the DFW metroplex. A northeastern suburb of Dallas, the city population was 27,103, as of the 2020 census with an estimated population of 33, 768 people today. Sachse is located off Texas State Highway 78 and President George Bush Turnpike and is approximately 1 mile (1.6 km) north of the Firewheel Town Center.

Collin County is located in the U.S. state of Texas. It is part of the Dallas-Fort Worth-Arlington metropolitan statistical area, and a small portion of the city of Dallas is in the county. At the 2020 United States census, the county's population is 1,064,465, making it the sixth-most populous county in Texas and the 43rd-largest county by population in the United States. Its county seat is McKinney.