Its post office is assigned ZIP code 97722 .
Diamond is west of Oregon Route 205 and south of Malheur Lake , 52 miles ( 84 km ) south - southeast of Burns by highway .
Diamond 's post office is assigned ZIP code 97722 .
Diamond is west of Oregon Route 205 and south of Malheur Lake , 52 miles ( 84 km ) south - southeast of Burns by highway .