Waco is a city in central Texas and is the county seat and largest city of McLennan County, Texas, United States. It is situated along the Brazos River and I-35, halfway between Dallas and Austin. The city had a 2010 population of 124,805, making it the 22nd-most populous city in the state. The 2018 US Census population estimate is 138,183. Amazing bodyrub providers, nuru massage Waco, TX directory.