The 2010 U. S. Census counted 12,702,379 people in Pennsylvania, making it the 6th-largest U. S. state by population.

Between the 2000 U. S. Census and the 2010 U. S. Census, the population of South Carolina grew 15.29% from 4,012,012 to 4,625,364. South Carolina ranks 10th for population growth rate among U. S. states for that period.

Between the 2000 U. S. Census and the 2010 U. S. Census, the population of Arizona grew 24.59% from 5,130,632 to 6,392,017. Arizona ranks 2nd for population growth among U. S. states for that period (Nevada's population grew 35.15%).

Between the 2000 U. S. Census and the 2010 U. S. Census, the population of North Carolina grew 18.46% from 8,049,313 to 9,535,483. North Carolina ranks 6th for population growth rate among U. S. states for that period.

According to the 2010 U. S. Census, Seattle's population rank is #1 in Washington and #23 in the U. S.