Male Orchard Oriole is quite distictive. Female Baltimore and Bullock's Orioles have grayer bellies than female Orchard Orioles. Female Hooded Oriole very similar but has a decurved bill.
Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.