Waco is the county seat of McLennan County, Texas. As of the 2000 census, the city had a total population of 113,726. It is the 26th largest city by population in Texas, and 195th in the US. The Waco MSA consists of McLennan County and has a population of 226,189. It is served by Waco Regional Airport. Waco apartments for rent comparison page shows most up to date rent information on Waco apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.