Population Demographics
Population, household and median age statistics are based primarily on the 2000 US Census data projected forward to the present day. Some of the factors considered in this projection are:

• historical patterns of population growth and migration
• independent collection of population counts
• the latest Census age distributions

The result is a comprehensive set of population estimates and projections which includes the knowledge of State, County, and private agencies about their detailed areas but also ensures that the total population is consistent with the Census Bureau estimates, which have proved extremely reliable over time.

Household counts and median age statistics undergo a similarly rigorous procedure.

How often is the data updated?
This content is updated every year after the release of interim statistics by the Census Bureau and other agencies. This process generally happens over the summer and is released in the fall.