Denver is the central city of a conurbation region in the U.S. state of Colorado. The conurbation includes one continuous region consisting of the six central counties of Adams, Arapahoe, Broomfield, Denver, Douglas and Jefferson. The Denver region is part of the Front Range Urban Corridor. The Office of Management and Budget also delineated the more extensive Denver-Aurora Combined Statistical Area comprising the Denver-Aurora-Lakewood Metropolitan Statistical Area, the Boulder Metropolitan Statistical Area, and the Greeley Metropolitan Statistical Area.