As of the 2010 census, the county had a population of 4.1 million, making it the most populous county in Texas and the third most populous county in the United States.
The county had a population of 4.1 million. This was as of the 2010 census. The county was making it the most populous county in Texas. This was as of the 2010 census. The county was making it the third most populous county in the United States. This was as of the 2010 census.