The City of Greeley is a Home Rule Municipality that is the county seat and the most populous city of Weld County, Colorado, United States.. Greeley is situated 50 miles North of the Colorado State Capitol in Denver. It is known as the 50 mile city, as it is also: •  50 miles from the capital of Wyoming (Cheyenne). The only City in the USA to be 50 miles from TWO State Capitals. •  50 miles from Estes Park in the Rocky Mountain National Forest. •  50 miles from Fort Morgan, the last of the plains cities on the prairie. The majority of the state is dominated by the mountain ranges and range lands of the Rocky Mountain West, while the Eastern most section of the state includes part of a high altitude prairie region known as the High Plains. According to 2006 Census Bureau estimates, the population of the city is 87,596.  Greeley is the 12th most populous city in the State of Colorado and the most populous city of Weld County .