JK
John Kozlowski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Hudson, New Jersey
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Hudson, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 9-person household.
Age 21
b. ~1909
Male
Son
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Hudson, New Jersey |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Chair Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Carpenter |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1909 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kozlowski | Son | — | 21 | ~1909 |
| Julia Kozlowski | Daughter | — | 13 | ~1917 |
| Mary Kozlowski | Spouse | — | 43 | ~1887 |
| Samuel Kozlowski | Head | — | 42 | ~1888 |
| Mary Kozlowski | Daughter | — | 15 | ~1915 |
| Sigmund Kozlowski | Son | — | 19 | ~1911 |
| Victoria Kozlowski | Daughter | — | 7 | ~1923 |
| Henry Kozlowski | Son | — | 3 | ~1927 |
| Raymond Kozlowski | Son | — | 10 | ~1920 |
Census Appearances
1930
Hudson, New …
Son, age 21
Hudson, New Jersey · implied b. ~1909 — 9 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Carpenter |
| Industry | Chair Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Head, age 32
Hudson-County, New Jersey · implied b. ~1908 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlow |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Occupation | Shipping Clerk |
| Industry | Warehouse |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1400 |
| Highest Grade | 8 |
| 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.
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 · 1930 · age 21 · b. ~1909 · New Jersey
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Sibling
Sigmund Kozlowski
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victoria Kozlowski
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kozlowski
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Kozlowski
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Kozlowski
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Kozlowski
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 — Hudson, New Jersey
Open full size
1930 US Federal Census — Hudson, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1354:0242)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Corcoran | 15 | Daughter | — | New Jersey |
| 2 | Daniel Corcoran | 13 | Son | — | New Jersey |
| 3 | Elizabeth Corcoran | 11 | Daughter | — | New Jersey |
| 4 | William Corcoran | 9 | Son | — | New Jersey |
| 5 | Madeline Corcoran | 5 | Daughter | — | New Jersey |
| 6 | Gertrude Corcoran | 3 | Daughter | — | New Jersey |
| 7 | John A. Hansen | 53 | Head | Foreman | Holland |
| 8 | Adele Hansen | 44 | Wife | — | Germany |
| 9 | Madeline Hansen | 19 | Daughter | Dispenser | Holland |
| 10 | Walter Hansen | 13 | Son | — | New Jersey |
| 11 | Harold Hansen | 9 | Son | — | New Jersey |
| 12 | Martin Berkowitz | 40 | Head | Hull Weight | Russia |
| 13 | Pauline Berkowitz | 39 | Wife | — | Russia |
| 14 | George Berkowitz | 14 | Son | — | New Jersey |
| 15 | Elsie Berkowitz | 13 | Daughter | — | New Jersey |
| 16 | Minnie Berkowitz | 7 | Daughter | — | New Jersey |
| 17 | Charles Moffett | 28 | Head | Teamster | New York |
| 18 | May Moffett | 26 | Wife | — | New Jersey |
| 19 | Daniel Deamer | 34 | Head | Laborer | New Jersey |
| 20 | Louise Deamer | 32 | Wife | — | Germany |
| 21 | Helen Deamer | 12 | Daughter | — | New Jersey |
| 22 | Stephen Lageder | 27 | Head | Chauffeur | New Jersey |
| 23 | Alice Lageder | 23 | Boarder | — | New Jersey |
| 24 | James Lageder | 25 | Boarder | — | New Jersey |
| 25 | Samuel Milby | 42 | Head | Laborer | New York |
| 26 | Mary A. Milby | 37 | Wife | — | New Jersey |
| 27 | Aloysius Milby | 12 | Son | — | New Jersey |
| 28 | Francis Milby | 9 | Son | — | New Jersey |
| 29 | Edward Sullivan | 28 | Head | Chauffeur | New Jersey |
| 30 | Winifred Sullivan | 27 | Wife | — | New Jersey |
| 31 | Edward Sullivan | 6 | Son | — | New Jersey |
| 32 | Raymond Sullivan | 5 | Son | — | New Jersey |
| 33 | Mary Sullivan | 65 | Mother | — | Irish Free State |
| 34 | Frank Goerbert | 32 | Head | Laborer | New Jersey |
| 35 | Margaret Goerbert | 35 | Wife | — | Irish Free State |
| 36 | Thomas Goerbert | 9 | Son | — | New Jersey |
| 37 | Theresa Goerbert | 7 | Daughter | — | New Jersey |
| 38 | Samuel Kozlowski | 42 | Head | Laborer | Poland |
| 39 | Mary Kozlowski | 43 | Wife | — | Poland |
| 40 | John Kozlowski THIS PERSON | 21 | Son | Carpenter | New Jersey |
| 41 | Sigmund Kozlowski | 19 | Son | Packer | New Jersey |
| 42 | Mary Kozlowski | 15 | Daughter | — | New Jersey |
| 43 | Julia Kozlowski | 13 | Daughter | — | New Jersey |
| 44 | Raymond Kozlowski | 10 | Son | — | New Jersey |
| 45 | Victoria Kozlowski | 7 | Daughter | — | New Jersey |
| 46 | Henry Kozlowski | 3 | Son | — | New Jersey |
| 47 | Vincent Kagan | 32 | Head | Riveter | Russia |
| 48 | Stella Kagan | 25 | Wife | — | New Jersey |
| 49 | Florence Kagan | 5 | Daughter | — | New Jersey |
| 50 | Clara Kagan | 3 | Daughter | — | New Jersey |
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)