Census U.S. Intercensal County Population Data, 1970-2014
The Census Bureau's Population Estimates Program publishes population estimates each year.
Spreadsheets and statistical software can read the comma-separated CSV file.
To download files in Internet Explorer, right click on them and select "Save Target As...".
National data users might find the national-level file easier to work with:
E-mail Jean Roth to report errors or problems.