John Bomhoff was born in Cotton Hill, Sangamon County, Illinois. He was the son of Henry Bomhoff and Susan Watson. He married Sara Foltz 10 Feb 1874 in Sangamon County. Their children included: Phoebe, Luther James, Viola, Allice, Roy, Harry R. Julia, Martin, Coral E. and Charles.
His siblings were William, George Moses, Salome, Mary E. and Laura.