1833 Birth:821,826 Birth year of 1833 estimated from age (17 years) in 1850 census enumeration. Birth place is unproven. Birth place of Preble County, Ohio is assumed as parents William McCoy and Margaret Frame were married there on 23 September 1830 and are believed to have come to Porter County, Indiana in 1834. However their arrival date has not been definitively established and it is possible they arrived in time for Jeremiah's birth in 1833. Birth place given in 1850 census enumeration was Indiana.

1840 U.S. Census:2276 Jeremiah enumerated in the household of his father William McCoy in Porter County, Indiana as one of three males between the ages of 5 and 10; younger brother William was age 5, Jeremiah was age 7, and older brother John was age 9.

1850 U.S. Census:821 Jeremiah enumerated in the household of his widowed mother Margaret McCoy in Porter Township, Porter County, Indian as a male, age 17, farmer, born in Indiana, in school.

1860 U.S. Census: Jeremiah McCoy not located; Jeremiah expected to be age 27 and born in either Indiana or Ohio.
• Jeremiah S. McCoy in Fabius Township, Marion County, Missouri, p. 960, was age 37 and born in Kentucky. (Ancestry.com: image 3)
• Jeremiah McCoy in Harrison Township, Knox County, Indiana, p. 1035, was age 22, born in Indiana, and was in one of several large McCoy families enumerated in succession on the same page (Ancestry.com: image 245)