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John Kozlowski — 1920 US Census Record

Linked across censuses

1920 United States Federal Census · Erie, New York

Our Model Tree links this John Kozlowski across the 1910 and 1920 US Censuses in Erie, New York (XGBoost, ~Confirmed) — first a son (b.~1900), then head of a 8-person household.

Age 20 b. ~1900 Male Son Born: Austria Single

1920 Census Record Details

Census Year1920
LocationErie, New York
SurnameKozlowski
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age20
Marital StatusSingle
BirthplaceAustria
Year of Immigration1901
Father's BirthplaceAustria
Mother's BirthplaceAustria
Additional Details
OccupationMachinist
IndustryMachine Shop
Class of WorkerW
Can ReadYes
Can WriteYes
Speaks EnglishYes
Mother TongueGerman
Birth CountryAustria
Birthplace (normalized)austria
OccupationMachinist
Township / WardBuffalo
Est. Birth Year~1900

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.

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

Name Relation to head Relative to John Age Birth yr
Walter Kozlowski Son — 7 ~1913
Frank Kozlowski Son — 24 ~1896
Martha Kozlowski Daughter — 26 ~1894
Martha Kozlowski Daughter — 16 ~1904
Mary Kozlowski Spouse — 46 ~1874
Anthony Kozlowski Head — 63 ~1857
John Kozlowski Son — 20 ~1900
Edward Kozlowski Son — 22 ~1898

Census Appearances

1910
Erie, New …
Son, age 10
Erie, New York · implied b. ~1900 — 4 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Kozlowski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 10
Marital Status Single
Birthplace Austria
Year of Immigration 1902
Father's Birthplace Austria
Mother's Birthplace Austria
Occupation Laborer
Industry Rail Road
Can Read Yes
Can Write Yes
Speaks English Polish
Birth Country Austria
Birthplace (normalized) austria
1920
Erie, New …
Son, age 20
Erie, New York · implied b. ~1900 — 8 household members
Surname Kozlowski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 20
Marital Status Single
Birthplace Austria
Year of Immigration 1901
Father's Birthplace Austria
Mother's Birthplace Austria
Occupation Machinist
Industry Machine Shop
Class of Worker W
Can Read Yes
Can Write Yes
Speaks English Yes
Mother Tongue German
Birth Country Austria
Birthplace (normalized) austria

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links John Kozlowski across 2 US Census years (1910 and 1920) in Erie, New York, using XGBoost record linkage.
Show:
This person
Anchor record
John Kozlowski
Son · 1920 · age 20 · b. ~1900 · New York
★ You are viewing this record
Sibling
Martha Kozlowski
Sibling · 1920 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Kozlowski
Sibling · 1920 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kozlowski
Sibling · 1920 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kozlowski
Sibling · 1920 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Kozlowski
Sibling · 1920 · age 16
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

49 people indexed on this census page (ia:1920:14thcensusofpopu1102unit:0835)

Line Name Age Relation Occupation Birthplace
52 Joseph Kozlowski 42 Head Salesman Posen Co-P
53 Mary Kozlowski 34 Wife — Posen G.P
54 Helen Kozlowski 15 Daughter — New York
55 Edward Kozlowski 12 Son — New York
56 Anna Kozlowski 10 Daughter — New York
57 Sophie Kozlowski 8 Daughter — New York
58 Martin Kozlowski 30 Head Machinist New York
59 Sophie Kozlowski 25 Wife — New York
60 Edward Kozlowski 3 Son — New York
61 Helen Kozlowski 1 Daughter — New York
62 Joseph Kozlowski 20 Brother Helper New York
63 Anthony Kozlowski 63 Head Gardener Austria
64 Mary Kozlowski 46 Wife — Austria
65 Martha Kozlowski 26 Daughter Bookkeeper Austria
66 Frank Kozlowski 24 Son Woodworker Austria
67 Edward Kozlowski 22 Son Clerk Austria
68 John Kozlowski THIS PERSON 20 Son Machinist Austria
69 Martha Kozlowski 16 Daughter Stenographer New York
70 Walter Kozlowski 7 Son — New York
71 Albert Kozlowski 27 Head Machinist New York
72 Mary Kozlowski 22 Wife — New York
73 Florence Kozlowski 2 Daughter — New York
74 Eleanor Kozlowski 0 Daughter — New York
75 John Kozlowski 60 Head Retired Posen G.P
76 Mary Kozlowski 56 Wife — Posen G.P
77 Frank Kozlowski 19 Son Labourer New York
78 Frank Kozlowski 28 Head Blacksmith Galicia
79 Mary Kozlowski 26 Wife — New York
80 Helen Kozlowski 5 Daughter — New York
81 Alice Kozlowski 3 Daughter — New York
82 Joseph Kozlowski 26 Head Machinist New York
83 Mary Kozlowski 26 Wife — New York
84 Dorothy Kozlowski 7 Daughter — New York
85 Alice Kozlowski 2 Daughter — New York
86 John Kozlowski 33 Head Carpenter New York
87 Mary Kozlowski 33 Wife — New York
88 John Kozlowski 6 Son Machinist New York
89 Edward Kozlowski 3 Son Riveter New York
90 Stanley Kozlowski 61 Head Helper Pennsylvania
91 Josephine Kozlowski 57 Wife — Pennsylvania
92 Anna Kozlowski 30 Daughter Labeler Pennsylvania
93 Joseph Kozlowski 11 Son — New York
94 Frank Kozlowski 39 Head Toolmaker New York
95 Mary Kozlowski 32 Wife — New York
96 Frank Kozlowski 11 Son — New York
97 Joseph Kozlowski 23 Head Machinist New York
98 Mary Kozlowski 22 Wife — New York
99 Joseph Kozlowski 5 Son — New York
100 Stanley Kozlowski 2 Son Repairman 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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