In the 1850 US Census for Carlton, Barry, Michigan the family of Alonzo Barnum was enumerated as follows:
Household #859; Family #878
Barnum, Alonzo; 40; M; Farmer; real estate value $1,000; b. N York
Barnum, Sophia; 42; F; b. N York
Barnum, Squires C; 15; M; Laborer; b. N York
Barnum, Rachel H; 13; F; b. N York; attended school during the previous year
Barnum, Esther H; 11; F; b. N York; attended school during the previous year
Barnum, Andrew L; 10; M; b. Mich; attended school during the previous year
Barnum, George R; 8; M; b. Mich; attended school during the previous year
Barnum, Alonzo B; 6; M; b. Mich; attended school during the previous year
Barnum, Milo S; 4; M; b. Mich
Barnum, Raba A; 2; M; b. Mich; Given name could be Rasa A.
Barnum, Ezra C; 6/12; M; b. Mich
The Thomas Barnum Genealogy [Source] gives a birth date of 11 OCT 1815
He was buried in Woodland Cemetery.