1930 U.S. Census, Baltimore City, Maryland
26th Ward, Enumeration District 4-410, Sheet 25A
3522 Elliott Street, Dwelling 277, Family 297
Smit, John O., head, owns, $2,500, owns radio set, male, white, 43, married, age at first marriage 27, not in school, can read and write, born in Maryland, father born in Germany, mother born in Maryland, electrician at chemical factory, wage worker, at work previous day, not a veteran
Smit, Marie, white, female, white, 34, married, age at first marriage 18, not in school, can read and write, born in Maryland, born parents born in Germany, no occupation
Smit, John O., Jr., son, male, white, 14, single, in school, can read and write, both parents born in Maryland, no occupation
Smit, Henry, son, male, white, 7, single, in school, both parents born in Maryland, no occupation
Smit, Catherine, daughter, female, white, 3, single, not in school, both parents born in Maryland, no occupation
Katop[?], Katherine, boarder, female, white, 30, single, not in school, can read and write, born in Maryland, both parents born in Germany, presser for pajama factory, wage worker

1940 U.S. Census, Baltimore City, Maryland
26th Ward, Enumeration District 4-760, Sheet 3B
3416 O’Donnell Street, household 41, rents, $20, not on farm
Davis, Emmett Sr., head, male, white, 45, married, not in school, highest level of education completed 8th grade, born in Virginia, lived in same house in 1935, at work week of March 24–30, worked 48 hours that week, conductor for railroad, works on own account, worked 45 weeks in 1939, income in 1939 $1,500, no other sources of income
Davis, Ida, wife, female, white, 42, married, not in school, highest level of education completed 8th grade, born in Virginia, lived in same house in 1935, not at work, not seeking work, engaged in housework, no other sources of income
Davis, Emmett Jr., son, male, white, 22, single, not in school, highest level of education completed 8th grade, born in Maryland, lived in same house in 1935, not at work, not seeking work, listed as “other” (not in school), no other sources of income
Davis, Joseph, son, male, white, 17, single, in school, highest level of education complete 12th grade, born in Maryland, lived in same house in 1935, not at work, not seeking work, in school, no other sources of income
Davis, Arlene, daughter, female, white, 6, single, in school, highest level of education complete 1st grade, born in Maryland, lived in same house in 1935, not at work, not seeking work, in school, no other sources of income
3416 O’Donnell Street, household 41, rents, $18, not on farm
Smit, John Sr., head, male, white, 24, married, not in school, highest level of education 2 years of high school, born in Maryland, lived in same house in 1935, at work week of March 24–30, worked 40 hours that week, laborer in brewery, wage worker, 52 weeks worked in 1939, income in 1939 $1,300, no other sources of income
Smit, Esther, wife, female, white, 23, married, not in school, highest level of education 4 years of high school, born in Maryland, lived in same house in 1935, not at work, not seeking work, engaged in housework, no other sources of income
Smit, John Jr., son, male, white, 1, single, not in school, born in Maryland, lived in same house in 1935 [sic], not at work, not seeking work, no other sources of income

On 16 October 1940, John Onnas Smit, Jr., registered for the World War II draft. He give his address as 3416 O’Donnell Street, Baltimore, Maryland; no telephone; 25 years old; born 3 June 1915 in Baltimore, Maryland; citizen of United States; name of person who will always know your address is Mrs. Virginia Smit, wife, of 3416 O’Donnell Street, Baltimore, Maryland; employer was Gunther Brewing Company of 1211 Conkling Street, Baltimore, Maryland. Signed John O Smit Jr. He was white; 6 feet tall; 180 pounds; blue eyes; brown hair; ruddy complexion. [The National Archives in St. Louis, Missouri; St. Louis, Missouri; Draft Registration Cards for Maryland, 10/16/1940 - 03/31/1947; Record Group: 147, Records of the Selective Service System; Box: 481.]