Ongo is an unincorporated community in northwestern Douglas County, Missouri, United States. Ongo is located on Missouri Route UU, on the north bank of Swan Creek. The Douglas-Christian county line is approximately one mile to the west. Missouri Route 14 is about two miles to the north and Honey Branch Cave, about one mile north.Keltner, Missouri, 7.5 Minute Topographic Quadrangle, USGS, 2004Arthur Paul Moser, A Directory of Towns, Villages, and Hamlets Past and Present of Douglas County, Missouri
Ongo had a post office from 1897 until 1949.Jim Forte, Postal History: Post offices of Douglas County, Missouri
References