Post Offices in Commerce City, Colorado, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Adams City Post Office No Reviews Favorite Fax: (303) 287-1862Phone: (303) 227-7381Retail Hours Commerce City Post Office No Reviews Favorite Fax: (303) 287-1862Phone: (303) 227-7381Retail Hours Dupont Post Office No Reviews Favorite Phone: (303) 287-4296Retail Hours