Aurora is a Home Rule Municipality spanning Arapahoe, Adams, and Douglas counties in Colorado. The city is the third most populous city in the state of Colorado and the 59th most populous city in the United States. It is one of the principal cities of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area (Metro Denver). The city of Aurora manages more than 100 parks, more than 6,000 acres (24 km2) of open space and natural areas, and six award-winning municipal golf courses (Aurora Hills, Meadow Hills, Murphy Creek, Saddle Rock, Springhill and Fitzsimons). Aurora also is home to several privately owned golf courses including CommonGround Golf Course, Heather Ridge Country Club, Heritage Eagle Bend Golf Club, John F. Kennedy Golf Course and Valley Country Club.