Windom was married to Carol Keyser from 1947 until they divorced in 1955. Secondly he married Barbara Joyce from 1958 until they divorced in 1963. Thirdly he married Barbara Goetz from 1963 until they divorced in 1968. Fourthly he married Jacqulyn Hopkins from 1969 until they divorced in 1974. Lastly he married Patricia Tunder from 1975 until his death in 2012.