Antoine & Domithilde Daoust emigrated to US ca.1876, and in 1880 they were in Defiance twp, Defiance Co., OH. You can see the info., free, at www.familysearch.org. Click census on left side bar, use box to scroll & click on 1880 us, put in only daoust for last name and ohio for census state, then hit search. Happy hunting.
J.R. Maxwell (whose distant Bunts "cousin" married Edward Chellis Daoust)