region 3 overview is comprised of adams arapahoe boulder broomfield clear creek denver douglas gilpin and jefferson counties it accounts for 4 9 colorado total land area the population 2 47 million or approximately 56 state s per capita income exceeds average every county in except home to two msas longmont capital also largest city has most highly developed infrastructure international airport located within an hour drive there are several general aviation reliever airports furthermore lies at important national transportation crossroads intersection interstate 25 north south with 70 east west 76 numerous higher education opportunities available university campuses school mines regis some nationally recognized universities military bases