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John Kowalski — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Essex, New Jersey

Our Model Tree links this John Kowalski across the 1920 and 1930 US Censuses in Essex, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 11-person household.

Age 12 b. ~1918 Male Son Born: New Jersey Single

1930 Census Record Details

Census Year1930
LocationEssex, New Jersey
SurnameKowalski
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age12
Marital StatusSingle
BirthplaceNew Jersey
Father's BirthplacePoland
Mother's BirthplacePoland
Additional Details
Can Read/WriteYes
Birth StateNew Jersey
Birth CountryUnited States
Birthplace (normalized)new jersey
Township / WardLivingston Town
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.

11 people recorded at the same address in the 1930 census.

Name Relation to head Relative to John Age Birth yr
Mary Kowalski Daughter — 1 ~1929
John Kowalski Son — 12 ~1918
Frank Kowalski Son — 8 ~1922
Helen Kowalski Daughter — 14 ~1916
Stanley Kowalski Son — 17 ~1913
Sophie Kowalski Daughter — 1 ~1929
Mary Kowalski Spouse — 45 ~1885
Joseph Kowalski Son — 20 ~1910
Edward Kowalski Son — 10 ~1920
Joseph Kowalski Head — 50 ~1880
Walter Kowalski Son — 5 ~1925

Census Appearances

1920
Essex, New …
Son, age 2
Essex, New Jersey · implied b. ~1918 — 10 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Kowalski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 2
Marital Status Single
Birthplace New Jersey
Father's Birthplace Poland
Mother's Birthplace Poland
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey
1930
Essex, New …
Son, age 12
Essex, New Jersey · implied b. ~1918 — 11 household members
Surname Kowalski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 12
Marital Status Single
Birthplace New Jersey
Father's Birthplace Poland
Mother's Birthplace Poland
Can Read/Write Yes
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 Kowalski across 2 US Census years (1920 and 1930) in Essex, New Jersey, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1930 · age 12 · b. ~1918 · New Jersey
★ You are viewing this record
Sibling
Walter Kowalski
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kowalski
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sophie Kowalski
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kowalski
Sibling · 1930 · 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

1930 US Federal Census — Essex, New Jersey Open full size

Page Contents

50 people indexed on this census page (ia:1930:newjerseycensus00reel1330:0573)

Line Name Age Relation Occupation Birthplace
51 Raymond 21 Son — New Jersey
52 Edna 18 Daughter — New Jersey
53 Mildred 16 Daughter — New Jersey
54 John Hess 32 Head — Ireland
55 Mary Hess 32 Wife — New York
56 John Hess 7 Son — New Jersey
57 Mary Hess 5 Daughter — New Jersey
58 Margaret Hess 0 Daughter — New Jersey
59 John Hess 45 Head Laborer New Jersey
60 Mary Hess 40 Wife — New Jersey
61 John Hess 19 Son — New Jersey
62 Mary Hess 15 Daughter — New Jersey
63 Joseph Kowalski 50 Head Laborer Poland
64 Mary Kowalski 45 Wife — Poland
65 Joseph Kowalski 20 Son Laborer New Jersey
66 Stanley Kowalski 17 Son Laborer New Jersey
67 Helen Kowalski 14 Daughter — New Jersey
68 John Kowalski THIS PERSON 12 Son — New Jersey
69 Edward Kowalski 10 Son — New Jersey
70 Frank Kowalski 8 Son — New Jersey
71 Walter Kowalski 5 Son — New Jersey
72 Sophie Kowalski 1 Daughter — New Jersey
73 Mary Kowalski 1 Daughter — New Jersey
74 John Kowalski 45 Head Laborer Poland
75 Mary Kowalski 40 Wife — Poland
76 John Kowalski 19 Son Laborer New Jersey
77 Mary Kowalski 17 Daughter — New Jersey
78 Stanley Kowalski 15 Son — New Jersey
79 Helen Kowalski 12 Daughter — New Jersey
80 Edward Kowalski 10 Son — New Jersey
81 Joseph Kowalski 45 Head Wood Working Poland
82 Mary Kowalski 40 Wife — Poland
83 John Kowalski 19 Son Wood Working New Jersey
84 Mary Kowalski 17 Daughter — New Jersey
85 Stanley Kowalski 15 Son — New Jersey
86 John Kowalski 45 Head Laborer New Jersey
87 Mary Kowalski 40 Wife — New Jersey
88 John Kowalski 19 Son — New Jersey
89 Mary Kowalski 17 Daughter — New Jersey
90 Stanley Kowalski 15 Son — New Jersey
91 John Kowalski 45 Head Laborer New Jersey
92 Mary Kowalski 40 Wife — New Jersey
93 John Kowalski 19 Son — New Jersey
94 John Kowalski 45 Head Laborer New Jersey
95 Mary Kowalski 40 Wife — New Jersey
96 John Kowalski 19 Son — New Jersey
97 Mary Kowalski 17 Daughter — New Jersey
98 John Kowalski 45 Head Laborer Poland
99 Mary Kowalski 40 Wife — Poland
100 John Kowalski 19 Son Laborer New Jersey

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1930 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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