Clarence Wilbur Maxim was born on February 17, 1849, in New Castle, Pennsylvania, to Marcus and Rebecca Maxim. His father was a “master farmer” who owned $1,500 of real estate and $400 of personal property by 1860. He grew up and attended school in Rochester, Massachusetts, and by 1870, he was working as a farm laborer.
He married Lucy Fuller Clark on August 23, 1874, and their daughter Mary was born around 1876. They lived in Rochester, and Maxim worked as a farmer. An early biographer described him as “one of the well-known men of Rochester and a prominent farmer and small fruit grower.” He specialized in growing cranberries. He supported the Republican Party, and he served as selectman in Rochester for several years. His wife died on January 20, 1920. By 1930, he was living with a 75-year-old housekeeper named Sarah Cobb in Rochester. He died in Rochester on July 2, 1931. In his will, he bequeathed around $80,000 to “several hospitals, the Red Cross, the Boy Scouts, the Salvation Army and several other organizations.”