1900 NY CENSUS - Ismond E. Knapp, age 6, b. Sep 1893 in New York, is enumerated with Ismond E., age 58, occupation farmer, b. Mar 1842 in New York, and his wife of 8 years, Elizabeth S., age 35, mother of 1 child, b. Mar 1865 in New York.
1st MARRIAGE – Ismond E. Knapp & Ruth M. Brace md 30 Nov 1916, Queens, New York City, New York
WWI Draft Registration Card – Ismond E. Knapp, 24y, of 1232 Highland Ave, Coraopolis, Allegheny co, Pennsylvania; born 21 Sept 1893, Lodi, New York; occupation chemist; married; dependents: wife
1920 NJ CENSUS - I. E. Knapp, age 26, occupation dye shop chemist, b. New York, is enumerate with his wife Ruth, age 26, b. New York, along with Elizabeth, age 2, b. Pennsylvania, and Brace (male), age 1, b. New Jersey.
1930 FL CENSUS – Ismond C. Knapp (36y, b New York, married at age 23y, occupation chemist) enumerated with wife Ruth M. (36y, b New York, married at age 23y), 3 children, Elizabeth L. (12y, b Pennsylvania), Brace I. (10y, b New Jersey) and Doris R. (8y, b New Jersey) and mother Elizabeth (65y, b New York, widowed)
1940 MS CENSUS – I.E. Knapp (48y, b New York, occupation chemist) enumerated with wife Ruth (44y, b New York) and 2 children, Elizabeth (25y, b New York) and Brace (22y, b New York); family was living at Pensacola, Florida in 1935
2nd MARRIAGE - Marie