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John Kowalski — 1930 US Census Record

Model Tree available

1930 United States Federal Census · Mercer, New Jersey

Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Mercer, New Jersey (XGBoost, ~Confirmed), with identified parents Peter & John — first a son (b.~1919), then head of a 8-person household.

Age 11 b. ~1919 Male Son Born: New Jersey Single

1930 Census Record Details

Census Year1930
LocationMercer, New Jersey
SurnameKowalski
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age11
Marital StatusSingle
BirthplaceNew Jersey
Father's BirthplaceAustria
Mother's BirthplaceAustria
Additional Details
Can Read/WriteYes
Birth StateNew Jersey
Birth CountryUnited States
Birthplace (normalized)new jersey
Township / WardHamilton Township
Est. Birth Year~1919

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 1930 census.

Name Relation to head Relative to John Age Birth yr
Joseph Kowalski Son — 13 ~1917
Helen Kowalski Daughter — 18 ~1912
Johnnie Kowalski Daughter — 16 ~1914
John Kowalski Son — 11 ~1919
Stanley Kowalski Son — 8 ~1922
Peter Kowalski Head — 55 ~1875
Mary Kowalski Other — 44 ~1886
Michael Kowalski Son — 20 ~1910

Census Appearances

1920
Mercer, New …
Son, age 1
Mercer, New Jersey · implied b. ~1919 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Kowalski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 1
Marital Status Single
Birthplace New Jersey
Father's Birthplace Austria
Mother's Birthplace Austria
Mother Tongue Polish
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey
1930
Mercer, New …
Son, age 11
Mercer, New Jersey · implied b. ~1919 — 8 household members
Surname Kowalski
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 11
Marital Status Single
Birthplace New Jersey
Father's Birthplace Austria
Mother's Birthplace Austria
Can Read/Write Yes
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey
1940
Mercer-County, New …
Son, age 21
Mercer-County, New Jersey · implied b. ~1919 — 4 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Kowalsky
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 21
Marital Status Single
Birthplace New Jersey
1935 Residence (City) Trenton City
1935 Residence (County) Mercer
Occupation Helper
Industry Trucking Co.
Class of Worker PW
Hours Worked 3
Income (1939) 300
Highest Grade Hs 4
1935 Residence Same House
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.
Model Tree available
Our Model Tree links John Kowalski across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Kowalski (~0.92 confidence) and father John Kowalski (~0.92 confidence) and mother Mary Kowalski (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1 Parents confidence ≈ 0.92
Father
Peter Kowalski
b. ~1875
Source father
● Household · direct · ~0.92
Father
John Kowalski
b. ~1896
Source father
● Household · direct · ~0.92
Mother
Mary Kowalski
b. ~1899
Source mother
● Household · direct · ~0.92
This person
Anchor record
John Kowalski
Son · 1930 · age 11 · b. ~1919 · New Jersey
★ You are viewing this record
Sibling
Stanley Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Johnnie Kowalski
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1930 · age 13
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 — Mercer, New Jersey Open full size

Page Contents

50 people indexed on this census page (ia:1930:newjerseycensus00reel1362:0094)

Line Name Age Relation Occupation Birthplace
51 James F Barnes 19 Son Helper New Jersey
52 Janet Barnes 13 Daughter — New Jersey
53 John H Barnes 24 Head Roofer England
54 Anna W Barnes 23 Wife-H — New Jersey
55 Arthur Barnes 2 Son — New Jersey
56 Margaret E Barnes 0 Daughter — New Jersey
57 Edward Barnes 47 Head Carpenter Helper England
58 Florence Barnes 46 Wife-H — England
59 Leroy H Barnes 13 Son — New Jersey
60 Jean Barnes 3 Daughter — New Jersey
61 Thomas Davidson 26 Head Horse Maker New Jersey
62 Hannah Davidson 24 Wife-H — England
63 William Barnes 26 Head Rubber Worker England
64 Elizabeth Barnes 26 Wife-H — New Jersey
65 Ada Bergen 43 Head — New Jersey
66 Martin Bergen 20 Son — New Jersey
67 Richard Bergen 19 Son Laborer New Jersey
68 Mary Bergen 16 Daughter Silk Mill New Jersey
69 Eulalia Bergen 14 Daughter Cigar New Jersey
70 James Bergen 12 Son — New Jersey
71 Veronica Bergen 7 Daughter — New Jersey
72 Paul Telesco 45 Head Carpenter Italy
73 Catharine Telesco 31 Wife-H — New York
74 Minnie Telesco 16 Daughter — New York
75 Michael Telesco 15 Son — New York
76 John Telesco 11 Son — New Jersey
77 Charles Telesco 9 Son — New Jersey
78 Margaret Telesco 7 Daughter — New Jersey
79 William H Dayton 57 Head — Pennsylvania
80 Monroe M Dayton 20 Son Laborer Pennsylvania
81 Jean Dayton 18 Daughter — New Jersey
82 Jean Dayton 2 Daughter — New Jersey
83 Charles Hamilton 48 Head Millwright Maryland
84 Cecelia Hamilton 43 Wife-H — Dist. of Columbia
85 Loretta Hamilton 22 Daughter Linoleum Worker Washington D.C.
86 Charles Hamilton 16 Son — Washington D.C.
87 Daisy Hamilton 14 Daughter — Washington D.C.
88 Ralph Hamilton 4 Son — New Jersey
89 Catharine Baus 7 Granddaughter — New Jersey
90 Robert Austin 43 Head Repair Man Pennsylvania
91 Catharine Austin 42 Wife-H — New Jersey
92 Donald Austin 11 Son — New Jersey
93 Peter Kowalski 55 Head Laborer Austria
94 Mary Kowalski 44 Wife-H — Austria
95 Michael Kowalski 20 Son Laborer Pennsylvania
96 Helen Kowalski 18 Daughter Laborer New Jersey
97 Johnnie Kowalski 16 Daughter — New Jersey
98 Joseph Kowalski 13 Son — New Jersey
99 John Kowalski THIS PERSON 11 Son — New Jersey
100 Stanley Kowalski 8 Son — New Jersey

Search for John Kowalski

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Pedigree Summary

John + 5 siblings
Gen 1 · 3 parents ~0.92
Max depth 4 (1900–1950 window)

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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