The U.S. Census Bureau estimates that the nation’s population increased from 325.1 million (July 2017) to 327.1 million (July 2018) — adding 2.0 million new residents. On average, the U.S. population has increased about 0.7 percent per year since 2013 or a 3.5 percent change over the past five years.
Nevada and Idaho had the fastest rate of growth (both at 2.1 percent) over the past year. Rounding out the list of most rapidly growing states are Utah (1.9 percent), Arizona (1.7), Florida (1.5 percent) and Washington (1.5 percent). Population totals decreased in eight states: Mississippi (-0.1), Wyoming (-0.2), Louisiana (-0.2), New York (-0.2), Hawaii (-0.3 percent), Alaska (-0.3 percent), Illinois (-0.4 percent), and West Virginia (-0.6 percent).
The most populous states in the US are California (39.5 million), Texas (28.7), Florida (21.2), New York (19.5), Pennsylvania (12.8) and Illinois (12.7). States with the largest one-year, July-to-July, population gains were Texas (+379,100), Florida (+322,500), California (+157,600), and Arizona (+122,700).
Missouri ranked 18th by population size with 6,126,452 residents. The state gained 17,840 new residents between July 2017 and July 2018. Neighboring Tennessee added 61,216 residents; neighboring Illinois lost 45,116 residents. Tennessee and Nebraska had the largest one-year percentage increases among states that surround Missouri: 0.9 and 0.6 percent, respectively. Oklahoma, Missouri, and Kentucky each grew by 0.3 percent and Kansas maintained it population from the previous year.