United States Population Data
2010 populations categorized by age group for each county in the United States were obtained from the Census Bureau and saved in the file populations_by_age.cas.
The file consists of 4 fields: state and county name, 5-digit state and county code, population, and age group.
Age groups are numbered 1-18 where:
The file includes 50 states and the District of Columbia but excludes Puerto Rico and island territories.zip file, < 1 mb