Westminster is a Home Rule Municipality in Adams and Jefferson counties in the U.S. state of Colorado. Westminster is a northwest suburb of Denver. The Westminster Municipal Center is located 9 miles (14 km) north-northwest of the Colorado State Capitol. The United States Census Bureau that the city population was 106,114 on April 1, 2010 Census. Westminster is the ninth most populous city in the state of Colorado and the 237th most populous city in the United States.