John Kozlowski — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Erie-County, New York

Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 5-person household.

Age 22 b. ~1918 Male Son Born: New York Single

1940 Census Record Details

Census Year	1940
Location	Erie-County, New York
Surname	Kozlowski
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	22
Marital Status	Single
Birthplace	New York
1935 Residence (City)	Buffalo City
1935 Residence (County)	Erie
Additional Details
Occupation	New Worker
Class of Worker	180
Highest Grade	H 4
1935 Residence	Same house
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Occupation	New Worker
Township / Ward	Buffalo City
Est. Birth Year	~1918

Household Members

Census records only state relationship to the household head. Pairwise kinship is derived (~90–95% accurate), not recorded. Step/blended families and boarders can break it.

5 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to John	Age	Birth yr
Geneveve Kozlowski	Daughter	—	20	~1920
Daniel Kozlowski	Son	—	14	~1926
Lawrence Kozlowski	Head	—	59	~1881
John Kozlowski	Son	—	22	~1918
Rose Kozlowski	Spouse	—	45	~1895

Census Appearances

1930

Erie, New …

Son, age 13

Erie, New York · implied b. ~1917 — 8 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Kozlowski
Given Name	John Jr
Relationship to Head	Son
Sex	M
Color / Race	White
Age	13
Marital Status	Single
Birthplace	New York
Father's Birthplace	Poland
Mother's Birthplace	New York
Can Read/Write	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1940

Erie-County, New …

Son, age 22

Erie-County, New York · implied b. ~1918 — 5 household members

Surname	Kozlowski
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	22
Marital Status	Single
Birthplace	New York
1935 Residence (City)	Buffalo City
1935 Residence (County)	Erie
Occupation	New Worker
Class of Worker	180
Highest Grade	H 4
1935 Residence	Same house
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

Our Model Tree links John Kozlowski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Kozlowski

Son · 1940 · age 22 · b. ~1918 · New York

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Sibling

Daniel Kozlowski

Sibling · 1940 · age 14

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Geneveve Kozlowski

Sibling · 1940 · age 20

Source co-child of head (derived)

● Co-child · derived · ~0.88

Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Erie-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02827-00139)

Line	Name	Age	Relation	Occupation	Birthplace
41	Jean Torzewski	15	Daughter	—	New York
42	Marie Torzewski	13	Daughter	—	New York
43	Frank Malachowski	45	Head	Machinist	New York
44	Mary Malachowski	44	Wife	—	New York
45	Richard Malachowski	25	Son	—	New York
46	Lorraine Malachowski	12	Daughter	—	New York
47	Boleslaw Przeziuk	47	Head	Car Repair	Poland
48	Constance Przeziuk	44	Wife	—	Poland
49	Raymond Przeziuk	26	Son	Handy Man	New York
50	Sigmund Garems	30	Head	Handy Man	New York
51	Jean Garems	24	Wife	—	Massachusetts
52	Howard Garems	11	Son	—	New York
53	Ada B. Borowski	35	Head	Char Woman	New York
54	Joseph Borowski	11	Son	—	New York
55	John Kozlowski	47	Head	Packer	Poland
56	Bertha Kozlowski	47	Wife	—	Poland
57	Harry Kozlowski	21	Son	Laborer	New York
58	Chester Kozlowski	19	Son	New Worker	New York
59	Anthony Nowak	45	Head	Assembly	New York
60	Lottie Nowak	40	Wife	Filter Woman	New York
61	Edward Nowak	20	Son	Printer	New York
62	Francis Nowak	17	Daughter	—	New York
63	John Nowak	15	Son	—	New York
64	Walter Nowak	13	Son	—	New York
65	Lawrence Kozlowski	59	Head	Car Man	New York
66	Rose Kozlowski	45	Wife	—	New York
67	John Kozlowski THIS PERSON	22	Son	New Worker	New York
68	Geneveve Kozlowski	20	Daughter	New Worker	New York
69	Daniel Kozlowski	14	Son	—	New York
70	John Thola	60	Head	Car Inspector	New York
71	Daniel Thola	17	Son	—	New York
72	Vincent Wank	51	Head	Fireman	Poland
73	Mary Wank	48	Wife	—	Poland
74	Geneveve Wank	21	Daughter	Machine Operator	New York
75	Stanley Wank	19	Son	New Worker	New York
76	Alex Wank	14	Son	—	New York
77	Tessie Wank	12	Daughter	—	New York
78	Telesfor Rutkowski	33	Head	Oiler	Ohio
79	Emily Rutkowski	34	Wife	Packer	New York
80	Eugenie Rutkowski	8	Daughter	—	New York

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.

Source: National Archives and Records Administration (NARA)

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