Diamond Bend Apartments Share: Apartment & Home Rental Diamond Bend Apartments Visit Website Request Info 4430 21st Street SE Mandan, ND 58554 (701) 551-2410 About Map About Spacious apartments, community room, pool table, fitness center, heated underground parking, elevator, and washer & dryers. Diamond Bend has all the latest amenities! What's Nearby? Distance: 5 10 15 20 25 50 mi.