Note: 1830 U.S. Federal Census [see father's listing]
1840 U.S. Federal Census [see father's listing]
1850 U.S. Federal Census [see father's listing]
1860 U.S. Federal Census searching....
He was one of the appraisers of the estate of George W. Nickols in February 1870. https://familysearch.org/pal:/MM9.3.1/TH-1-18272-68321-32?cc=1909099&wc=M6DN-1N5:179689901,179717401
1870 U.S. Federal Census Fayette County, West Virginia Dempsey, Wm 41 Dempsey, Melvina 47 Dempsey, Joseph L. 18 Dempsey, John A. 16 Dempsey, Thomas H. 12 Dempsey, Mary S. 9 Dempsey, William S. 67 (106A in file)
1880 U.S. Federal Census Fayette County, West Virginia Kanawha Dempsey, W. H. 57 Dempsey, Melvina 57 wife Dempsey, Joseph L. 27 son Dempsey, Thomas H. 22 son Dempsey, Mary S. 19 daughter Hendricks, George 10 hired Owens, John 1 adopted
Last Will and Testament West Virginia Will Books, 1756-1971 Fayette Will book, v. 03 1885-1901 Page 100 (image 82 at FamilySearch) Mentions his wife Melvina, neighbor and friend Eden Nugen Written 5 April 1888 Probated 17 Sep 1888 https://familysearch.org/pal:/MM9.3.1/TH-1-18272-69407-41?cc=1909099&wc=10916503