Baytown is a city in the U.S. state of Texas, within Harris and Chambers counties. Located in the Houston–The Woodlands–Sugar Land metropolitan statistical area, it lies on the northern side of the Galveston Bay complex near the outlets of the San Jacinto River and Buffalo Bayou. It is the sixth-largest city within this metropolitan area and seventh largest community. Major highways serving the city include State Highway 99, State Highway 146 and Interstate 10. At the 2020 U.S. census, Baytown had a population of 83,701, and it had an estimated population of 84,324 in 2022.

Harris County is a county located in the U.S. state of Texas; as of the 2020 census, the population was 4,731,145, making it the most populous county in Texas and the third-most populous county in the United States. Its county seat is Houston, the most populous city in Texas and fourth-most populous city in the United States. The county was founded in 1836 and organized in 1837. It is named for John Richardson Harris, who founded the town of Harrisburg on Buffalo Bayou in 1826. According to the July 2022 census estimate, Harris County's population has shifted to 4,780,913 comprising over 16% of Texas's population. Harris County is included in the nine-county Houston–The Woodlands–Sugar Land metropolitan statistical area, which is the fifth-most populous metropolitan area in the United States.