what county is northglenn co in
Homefacts City Report. Northglenn is located in Adams County, CO. The population is 36,366, making Northglenn the 3rd largest city in Adams County. There are 16 public schools in Northglenn with an average Homefacts rating of C. The total crime rate for Northglenn is moderate, and there are 58 registered sex offenders residing in the city.