lakewood co is in what county
Lakewood, CO. Online Offers. Lakewood is a Home Rule Municipality that is the most populous city in Jefferson County, Colorado, United States. Lakewood is the fifth most populous city in the State of Colorado and the 172nd most populous city in the United States. The United States Census Bureau estimates that in April 1, 2010 census the population of the City of Lakewood was 142,980 .