Resident Population Estimates Sorted for the Largest-to-Smallest U.S. Counties Based on July 1, 2012 Population Estimates: April 1, 2010 to July 1, 2012 - This table is now accessible through American FactFinder. Click on the link above for "Annual Population Estimates" and select the link to "All States." This will bring you to the 2012 Population Estimates table "PEPANNRES, Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2012." Select the Action "Modify Table." In the 2012 Population Estimates column, click on the down arrow to sort the column in descending order. Click "OK." Estimates for all U.S. counties will be sorted from the largest to smallest 2012 population estimates.