Missouri had a population of 5,988,927, according to the 2010 Census; an increase of 392,369 (7.0 percent) since the year 2000. From 2000 to 2007, this includes a natural increase of 137,564 people since the last census (480,763 births less 343,199 deaths), and an increase of 88,088 people due to net Human migration into the state. Immigration to the United States from outside the United States resulted in a net increase of 50,450 people, and migration within the country produced a net increase of 37,638 people. Over half of Missourians (3,294,936 people, or 55.0%) live within the states two largest metropolitan areas-Missouri census statistical areas. The states population density 86.9 in 2009, is also List of U.S. states by population density.. How many people made up the population of Missouri in 2000 if the population is now 5,988,927 and there's been a 7% increase?