The most recent census shows that overall the population of Colorado increased 16.9% (to 5, 029,196), while the City of Boulder specifically increased nominally 2.9% (to 97,385 people) over the last 10 years (from 2000 - 2010). Other communities of Boulder County that had significant growth are Longmont +21.3% and Superior +38.5%, while Erie (which straddles Boulder & Weld Counties) increased by 94% and Broomfield (which straddles Boulder & Broomfield Counties) increased by 46%.

Boulder County Cities/Towns: Boulder: 97,385, up 2.9 percent. Longmont: 86,270, up 21.3 percent. Broomfield: 55,889, up 46 percent. Lafayette: 24,453, up 5.4 percent. Louisville: 18,376, down 3.1 percent Superior: 12,483, up 38.5 percent Niwot: 4,006, down 3.7 percent. Allenspark: 528, up 6.5 percent Jamestown: 274, up 33.7 percent Gold Hill: 230, up 9.5 percent Ward: 150, down 11.2 percent.