 As of the 2010 census, there were about 6.2 same-sex couples per 1,000 households in the county.As of the census of 2000, 3,400,578 people, 1,205,516 households, and 834,217 families resided in the county, making it the largest county by population in Texas.The population density was 1,967 people per square mile (759/km²).