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John Kozlowski — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Essex-County, New Jersey

Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 8-person household.

Age 16 b. ~1924 Male Son Born: New Jersey Single

1940 Census Record Details

Census Year1940
LocationEssex-County, New Jersey
SurnameKozlowski
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age16
Marital StatusSingle
BirthplaceNew Jersey
1935 Residence (City)W. Orange
1935 Residence (County)Essex
Additional Details
Highest GradeHs 3
1935 ResidenceSame place
Birth StateNew Jersey
Birth CountryUnited States
Birthplace (normalized)new jersey
Township / WardW Orange
Est. Birth Year~1924

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 1940 census.

Name Relation to head Relative to John Age Birth yr
John Kozlowski Son — 16 ~1924
Catherine Kozlowski Spouse — 42 ~1898
George Kozlowski Son — 18 ~1922
Joseph Kozlowski Head — 49 ~1891
Joseph Kozlowski Son — 19 ~1921
William Kozlowski Son — 14 ~1926
Robert Kozlowski Son — 17 ~1923
Dolores Kozlowski Daughter — 13 ~1927

Census Appearances

1930
Essex, New …
Son, age 5
Essex, New Jersey · implied b. ~1925 — 9 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Kozlowski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 5
Marital Status Single
Birthplace New Jersey
Father's Birthplace Austria
Mother's Birthplace New Jersey
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey
1940
Essex-County, New …
Son, age 16
Essex-County, New Jersey · implied b. ~1924 — 8 household members
Surname Kozlowski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 16
Marital Status Single
Birthplace New Jersey
1935 Residence (City) W. Orange
1935 Residence (County) Essex
Highest Grade Hs 3
1935 Residence Same place
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey

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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kozlowski
Son · 1940 · age 16 · b. ~1924 · New Jersey
★ You are viewing this record
Sibling
Robert Kozlowski
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kozlowski
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Kozlowski
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolores Kozlowski
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Kozlowski
Sibling · 1940 · age 14
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 — Essex-County, New Jersey Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02341-00680)

Line Name Age Relation Occupation Birthplace
1 Martha Paulsen 40 Wife — New Jersey
2 Vincent Wistowski 34 Head Clerk New Jersey
3 Elsie Wistowski 29 Wife Lampworker New Jersey
4 James Cosgrove 53 Head Janitor New Jersey
5 Adeline Cosgrove 57 Wife — New Jersey
6 James Cosgrove 21 Son Machinist New Jersey
7 George Cosgrove 17 Son — New Jersey
8 Ruth Cosgrove 16 Daughter — New Jersey
9 Thomas Robinson 32 Head Helper England
10 Frances Robinson 24 Wife — New Jersey
11 Frances Robinson 2 Daughter — New Jersey
12 Edward Rappaport 37 Head Lineman New York
13 Catherine Rappaport 37 Wife — New York
14 Edward Rappaport 15 Son New Worker New Jersey
15 Anna Rappaport 14 Daughter — New Jersey
16 Charles Rappaport 13 Son — New Jersey
17 Margaret Rappaport 14 Daughter — New Jersey
18 Dorothy Rappaport 12 Daughter — New Jersey
19 Richard Smith 34 Head Route Salesman New York
20 Elsie Smith 33 Wife — New Jersey
21 Richard Jr. Smith 13 Son — New Jersey
22 Patricia Smith 10 Daughter — New Jersey
23 Raymond Smith 4 Son — New Jersey
24 Nancy Smith 3 Daughter — New Jersey
25 Peter Smith 1 Son — New Jersey
26 George Desanza 35 Son-in-law Loader New Jersey
27 Leslie Parker 30 Head Bookkeeper New York State
28 Evelyn Parker 26 Wife — New Jersey
29 Nancy Parker 3 Daughter — New Jersey
30 Arthur Peter 53 Father-in-law Shipping Clerk New York
31 Charlotte Peter 55 Mother-in-law — Maryland
32 Gail P. Peter 20 Sister-in-law — New Jersey
33 Joseph Kozlowski 49 Head Mail Carrier Austria
34 Catherine Kozlowski 42 Wife — New Jersey
35 Joseph Kozlowski 19 Son — New Jersey
36 George Kozlowski 18 Son New Worker New Jersey
37 Robert Kozlowski 17 Son New Worker New Jersey
38 John Kozlowski THIS PERSON 16 Son — New Jersey
39 William Kozlowski 14 Son — New Jersey
40 Dolores Kozlowski 13 Daughter — New Jersey

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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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