Youth Organization All Locations... City of Diamond BarCommunity of Hacienda HeightsSurrounding Areas go Results Found: 2 Button group with nested dropdown YMCA of Orange County Civic Groups/Churches YMCA of Orange County 22600 Sunset Crossing Road Diamond Bar CA 91765 (714) 549-9622 Youth Science Center Youth Science Center 16949 Wedgeworth Dr. Hacienda Heights CA 91745 (626) 854-9825 Visit Website