Post Offices in Westminster, Colorado, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Harris Park Post Office No Reviews Favorite Fax: (303) 430-7508Phone: (303) 487-0620Retail Hours Westminster Post Office No Reviews Favorite Fax: (303) 464-0396Phone: (303) 464-9941Retail Hours