William was born at
South Carolina on 27 November 1801. He was the son of
John Millen and
Martha Moffett. He married
Martha Jane Bonner at
South Carolina circa 1830. He married
Eleanor McDill at
Preble Co., Ohio, on 21 November 1844. William was listed as the head of a family on the 1850 Census at
Bloomington Twp., Monroe Co., Indiana. 1850 Indiana, Monroe Co., Bloomington Twp. taken 17 Sept 1850 lists the following family at household and family # 245: William Millen, age 48, male, farmer, real estate valued at $4000, born in South Carolina; Ellianor Millen, age 38, female, born in Ohio; Eliza Millen, age 18, female; James Millen, age 16, male; William Millen, age 11, male; Nancy Glenn, age 24, female.. William was listed as the head of a family on the 1860 Census at
Bloomington Twp., Monroe Co., Indiana. 1860 Indiana, Monroe Co., Bloomington Twp. lists the following family at dwelling # 374: Wm. M. Millen, age 59, male, white, farmer, born in South Carolina; Elanor Millen, age 49, female, white, born in Ohio; Eliza H. Millen, age 28, female, white, born in South Carolina; Wm. B. Millen, age 20, male, white, born in Indiana; Hannah L. Stiner, age 14, female, white, born in Indiana; J. Baltenhous, age 12, male, white, apprentice farmer, born in Indiana; M. McDill, age 82, female, white, born in South Carolina; David Quick, age 19, male, white, laborer, born in Indiana.. William was listed as the head of a family on the 1870 Census at
Bloomington Twp., Monroe Co., Indiana. 1870 Indiana, Monroe Co., Bloomington Twp. lists the following family: Wm. Millen, age 69, born in South Carolina; Ellen Millen, age 59, born in Ohio; Eliza Millen, age 35, born in South Carolina; Mary McDill, age 94, born in South Carolina.. William died on 5 January 1892 at age 90. His body was interred in January 1892 at
Bloomington, Monroe Co., Indiana, at United Presbyterian Cemetery.