As of the 2010 census, the population was 316,236, making it the third-most populous county in Virginia (behind Fairfax County and Prince William County, respectively), in July 2014, the population was estimated to be 330,043.
The population was estimated to be 330,043. The population was 316,236. This was of the 2010 census. The population was making it the third-most populous county in Virginia (behind Fairfax County). This was in July 2014. This was of the 2010 census. This was respectively. The population was making it the third-most populous county in Virginia (behind Prince William County). This was in July 2014. This was of the 2010 census. This was respectively.