1860 U.S. Census:416 David enumerated in the household of his father Cyrus Bay in Union Township, Porter County, Indiana as a male, age 8, born in Indiana, in school within the year.

1870 U.S. Census:1297 David enumerated in the household of his father Cyrus Bay in Portage Township, Porter County, Indiana as a male, age 16, white, born in Indiana, can read and write.

1890 Voter Registration:2238, David S. Bay, p. 184. Congressional District 1, Ward 30, Precinct 13, Morgan St. between 56th and 57th, David S. Bay, born in Indiana, white, lived in precinct 30 days, lived in county 3 years, lived in state 3 years, not naturalized citizen, qualified voter, registration application dated 14 October 1890, voted, ballot number 281.

1892 Voter Registration:2239, D. S. Bay, p. 282. Congressional District 1, Ward 31, Precinct 11, 8815 Goodspeed Ave., D. S. Bay, born in Indiana, lived in precinct 2 months, lived in county 5 years, lived in state 5 years, native citizen, qualified voter, registration application dated 18 October 1892, voted.

1899 Pension Circular of Cyrus Bay:173 David S. listed among "still living" children of Cyrus Bay.

Descendants:1498
Gladys Bay Patterson
Grace Bay
Earl Bay
Arthur Bay
Elizabeth Bay
Ethel Bay Stokes
Dessie bay