Waco is located in and the county seat of McLennan County, Texas. It is situated along the Brazos River and on the I-35 corridor, halfway between Dallas and Austin. The city had a 2010 population of 124,805, an increase of almost 10 percent since the 2000 census, making it the twenty-second most populous city in the state. The Waco Metropolitan Statistical Area consists of just McLennan County, which had a 2010 population of 234,906.

The median income for a household in the city is $26,264, and the median income for a family is $33,919. Males have a median income of $26,902 versus $21,159 for females. The per capita income for the city is $14,584. 26.3% of the population and 19.3% of families are below the poverty line. Out of the total population, 30.9% of those under the age of 18 and 13.0% of those 65 and older are living below the poverty line.