The U.S. Census Bureau has released July 1, 2007, estimates of the voting-age population in each state. The Census Bureau is required by law to produce these estimates annually for the Federal Election Commission.

The estimates show the total number of residents in each state, the total population age 18 and older, and the percentage of the total population 18 and older. They do not reflect citizenship status or voting eligibility. According to the estimates, California had the largest adult population, at 27.2 million, while Vermont had the highest percentage adult population, at 78.9 percent. There were 227.7 million U.S. residents 18 and older, comprising 75.5 percent of the total population.

North Carolina has an estimated 9,061,032 residents, with 6,843,352 ages 18 and older — 75.5 percent.