79. DIANE HENDRICKS

$7 BILLION  SELF-MADE SCORE: ( SOURCE: ROOFING AGE: 72 RESIDENCE: AFTON, WI PHILANTHROPY SCORE: America’s richest self-made woman grew up on a Wisconsin dairy farm and did stints as a waitress and as a pen-factory worker before meeting her roofer husband, Ken Hendricks (d. 2007), while selling custom homes. Together, the couple renovated and rented out apartments. They founded ABC Supply in Beloit, Wisconsin, in 1982. It’s now the nation’s largest distributor of roofing. Under Hendricks, who is chairperson, the business surpassed $10 billion in annual sales for the first time in 2018.