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Mary Kozlowski — 1920 US Census Record

Linked across censuses

1920 United States Federal Census · Erie, New York

Our Model Tree links this Mary Kozlowski across the 1920 and 1930 US Censuses in Erie, New York (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 9-person household.

Age 0 b. ~1920 Female Daughter Born: New York Single

1920 Census Record Details

Census Year	1920
Location	Erie, New York
Surname	Kozlowski
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	0
Marital Status	Single
Birthplace	New York
Father's Birthplace	Poland
Mother's Birthplace	Poland
Additional Details
Mother Tongue	Polish
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Township / Ward	Depew Village
Est. Birth Year	~1920

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.

9 people recorded at the same address in the 1920 census.

Name	Relation to head	Relative to Mary	Age	Birth yr
Frank Kozlowski	Son	—	2	~1918
John Kozlowski	Son	—	6	~1914
Joseph Kozlowski	Son	—	4	~1916
Angeline Kozlowski	Daughter	—	8	~1912
Helen Kozlowski	Daughter	—	10	~1910
Martha Kozlowski	Daughter	—		~1920
Stanley Kozlowski	Head	—	34	~1886
Mary Kozlowski	Spouse	—	31	~1889
Mary Kozlowski	Daughter	—		~1920

Census Appearances

1920

Erie, New …

Daughter, age

Erie, New York · implied b. ~1920 — 9 household members

Surname	Kozlowski
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	0
Marital Status	Single
Birthplace	New York
Father's Birthplace	Poland
Mother's Birthplace	Poland
Mother Tongue	Polish
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1930

Erie, New …

Daughter, age 10

Erie, New York · implied b. ~1920 — 9 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Kozlowska
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	10
Marital Status	Single
Birthplace	New York
Father's Birthplace	Poland
Mother's Birthplace	Poland
Can Read/Write	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

Our Model Tree links Mary Kozlowski across 2 US Census years (1920 and 1930) in Erie, New York, using XGBoost record linkage.

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This person

Anchor record

Mary Kozlowski

Daughter · 1920 · age 0 · b. ~1920 · New York

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Sibling

Frank Kozlowski

Sibling · 1920 · age 2

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Angeline Kozlowski

Sibling · 1920 · age 8

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Joseph Kozlowski

Sibling · 1920 · age 4

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Martha Kozlowski

Sibling · 1920 · age

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

John Kozlowski

Sibling · 1920 · age 6

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Helen Kozlowski

Sibling · 1920 · age 10

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

1920 US Federal Census — Erie, New York Open full size

Page Contents

50 people indexed on this census page (ia:1920:14thcensusofpopu1109unit:0992)

Line	Name	Age	Relation	Occupation	Birthplace
1	John Kozlowski	55	Head	—	New York
2	Rose Kozlowski	51	Wife	—	New York
3	Frank Kozlowski	25	Son	Laborer	Poland
4	Stella Kozlowski	22	Daughter-in-law	—	Poland
5	Edward Kozlowski	7	Grandson	—	Poland
6	Bernice Kozlowski	4	Daughter	—	New York
7	Martha Kozlowski	2	Daughter	—	New York
8	Cecelia Kozlowski	0	Daughter	—	New York
9	John Kozlowski	25	Son	Laborer	Poland
10	Leander Brack	52	Head	Laborer	New York
11	Eva Brack	49	Wife	Boiler Maker	Poland
12	Jerome Brack	21	Son	—	New York
13	Valeria Brack	17	Daughter	Bookkeeper	New York
14	Leonard Brack	15	Son	Laborer	New York
15	Monica Brack	13	Daughter	—	New York
16	Bruno Brack	9	Son	—	New York
17	Stella Brack	5	Daughter	—	New York
18	Peter Coyer	26	Head	Machinist	New York
19	Antoinette Coyer	19	Wife	—	Poland
20	Ann Coyer	0	Daughter	—	New York
21	John Coyer	41	Son	—	Poland
22	Mary Coyer	38	Wife	—	Poland
23	John Coyer	13	Son	—	New York
24	John Kozlowski	39	Head	Laborer	Poland
25	Martha Kozlowski	30	Wife	Laborer	Poland
26	Alice Kozlowski	4	Daughter	—	New York
27	John Kozlowski	2	Son	—	New York
28	Stanley Kozlowski	34	Head	Machinist	Poland
29	Mary Kozlowski	31	Wife	—	New York
30	Helen Kozlowski	10	Daughter	—	New York
31	Angeline Kozlowski	8	Daughter	—	New York
32	John Kozlowski	6	Son	—	New York
33	Joseph Kozlowski	4	Son	—	New York
34	Frank Kozlowski	2	Son	—	New York
35	Martha Kozlowski	0	Daughter	—	New York
36	Mary Kozlowski THIS PERSON	0	Daughter	—	New York
37	John Kozlowski	55	Head	Laborer	Poland
38	Rose Kozlowski	51	Wife	—	Poland
39	Frank Kozlowski	25	Son	Laborer	Poland
40	Stella Kozlowski	22	Daughter-in-law	—	Poland
41	Edward Kozlowski	7	Grandson	—	Poland
42	Bernice Kozlowski	4	Daughter	—	New York
43	Martha Kozlowski	2	Daughter	—	New York
44	Cecelia Kozlowski	0	Daughter	—	New York
45	John Kozlowski	25	Son	Laborer	Poland
46	Stella Kozlowski	22	Daughter-in-law	—	Poland
47	Edward Kozlowski	7	Grandson	—	Poland
48	Bernice Kozlowski	4	Daughter	—	New York
49	Martha Kozlowski	2	Daughter	—	New York
50	Cecelia Kozlowski	0	Daughter	—	New York

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1920 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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