Images:
https://www.flickr.com/photos/mooregenealogy/sets/721576818807665041920 U.S. Census, Baltimore City, Maryland
Enumeration District 255, Sheet 16B
2811 Windsor Avenue
Kopp, Charles M., head, owner, mortgaged, male, white, 33, married, can read and write, born in Maryland, both parents born in Maryland, speaks English, salesman in upholstery, wage worker
Kopp, Clara E., wife, female, white, 33, married, can read and write, born in Pennsylvania, both parents born in Pennsylvania, speaks English, no occupation
Koons, Minnie E., sister-in-law, female, white, 40, single, can read and write, born in Pennsylvania, both parents born in Pennsylvania, speaks English, no occupation
1930 U.S. Census, Baltimore City, Maryland
15th Ward, Block 437, Enumeration District 4-291, Supervisor’s District 4, Sheet 9A
Enumerated on 9 and 10 April 1930
2811 Windsor Avenue
Dwelling 29, Household 110
Kopp, Charles N., head, owner, $4,500 in real estate, owns radio set, not on farm, male, white, age 42, married, first married at age 25, not in school, can read and write, born in Maryland, both parents born in Maryland, occupation dispatcher for taxi company, wage worker, at work previous day, not a veteran
Kopp, Clara E., wife, female, white, age 42, married, first married at age 25, not in school, can read and write, born in Pennsylvania, both parents born in Pennsylvania, no occupation
Koons, Minnie, sister-in-law, female, white, age 55, single, not in school, can read and write, born in Pennsylvania, both parents born in Pennsylvania, no occupation
1940 U.S. Census, Baltimore City, Maryland
15th Ward, Enumeration District 6-489, Sheet 8B
2811 Windsor Avenue, household 191, owned, value $3,000
Kopp, Charles M., head, male, white, 53, married, not in school, highest level of education 6th grade, born in Maryland, living in same house in 1935, at work week of March 24–30, worked 60 hours that week, dispatcher for public utility, wage worker, employed 52 weeks in 1939, income in 1939 $1,000, no other source of income
Kopp, Clare, wife, female, white, 53, married, not in school, highest level of education 8th grade, born in Pennsylvania, living in same house in 1935, not at work, not seeking work, engaged in housework, no other sources of income
Koons, Minnie, sister-in-law, female, white, 63, single, not in school, highest level of education 8th grade, born in Pennsylvania, living in same house in 1935, not at work, not seeking work, engaged in housework, no other sources of income