The City of Evans is a home rule municipality located in Weld County, Colorado, United States. The city population was 22,165 at the 2020 …The City of Evans is a home rule municipality located in Weld County, Colorado, United States. The city population was 22,165 at the 2020 United States Census, a 19.57% increase since the 2010 United States Census. Evans is a part of the Greeley, CO Metropolitan Statistical Area and the Front Range Urban Corridor.