The nation's Hispanic population increased 1.4 million to reach 45.5 million on July 1, 2007, or 15.1 percent of the estimated total U.S. population of 301.6 million.

National and state estimates by race, Hispanic origin, sex and age released by the U.S. Census Bureau also show that the Hispanic population exceeded 500,000 in 16 states. The U.S. Census Bureau statistics were released May 1, 2008.

Iowa’s population grew to an estimated 2.98 million residents. Hispanic population grew by an estimated 4.7 percent to 111,247 residents, while the black population grew 3.8 percent, to an estimated 77,477 residents.

Counties around Iowa's urban centers continued to grow, while the state saw its population grow by just one-half a percentage point last year, according to U.S. Census Bureau estimates released March 20, 2008.

Dallas County was the only county in Iowa to crack the Top 100 fastest growing counties. The majority of Iowa's rural counties continued to see their populations shrink. Use the search below to look for population estimates for all states and counties in the United States.