Dallas is the largest city in Dallas County and the third-largest in the US state of Texas. Portions of the city extend to other neighboring counties, including Rockwall, Kaufman, Denton, and Collin. With an estimated population of about 1.3 million, Dallas is the ninth most populous city in the United States. Dallas is located in northern Texas and is the core of the metropolitan area in the southern region of the United States. Additionally, it is the country’s largest inland metropolitan area without a navigable link to the sea. The city’s population is multi-ethnic with a myriad of religious backgrounds.