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John Kozlowski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, New Jersey
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Middlesex, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 6-person household.
Age 0
b. ~1930
Male
Son
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, New Jersey |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Additional Details | |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Carteret Borough |
| Est. Birth Year | ~1930 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Stephen Kozlowski | Head | — | 36 | ~1894 |
| Frances Kozlowski | Daughter | — | 11 | ~1919 |
| Stephen Kozlowski | Son | — | 1 | ~1929 |
| John Kozlowski | Son | — | ~1930 | |
| Helen Kozlowski | Daughter | — | 8 | ~1922 |
| Mary Kozlowski | Spouse | — | 32 | ~1898 |
Census Appearances
1930
Middlesex, New …
Son, age
Middlesex, New Jersey · implied b. ~1930 — 6 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Union-County, New …
Son, age 11
Union-County, New Jersey · implied b. ~1929 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlow |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Plainfield |
| 1935 Residence (County) | Union |
| Highest Grade | No 5 |
| 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 0 · b. ~1930 · New Jersey
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Sibling
Stephen Kozlowski
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Kozlowski
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kozlowski
Sibling · 1930 · age 8
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 — Middlesex, New Jersey
Open full size
1930 US Federal Census — Middlesex, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1366:0016)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Violet Handel | 8 | Daughter | — | New York |
| 52 | Carl Handel | 3 | Son | — | New Jersey |
| 53 | Paul Leich | 45 | Head | Foreman | New Jersey |
| 54 | Anna Leich | 40 | Wife | — | New Jersey |
| 55 | Catherine Leich | 20 | Daughter | — | New Jersey |
| 56 | Mary Leich | 18 | Daughter | — | New Jersey |
| 57 | John Leich | 12 | Son | — | New Jersey |
| 58 | John Shorty | 26 | Head | Truck Driver | New Jersey |
| 59 | Elizabeth Shorty | 24 | Wife | — | New Jersey |
| 60 | Janet Shorty | 3 | Daughter | — | New Jersey |
| 61 | Alex Ireland | 30 | Head | Machinist | New Jersey |
| 62 | Nellie Ireland | 21 | Wife | — | New Jersey |
| 63 | Alex Ireland | 3 | Son | — | New Jersey |
| 64 | Stephen Kozlowski | 36 | Head | Laborer | New Jersey |
| 65 | Mary Kozlowski | 32 | Wife | — | New Jersey |
| 66 | Frances Kozlowski | 11 | Daughter | — | New Jersey |
| 67 | Helen Kozlowski | 8 | Daughter | — | New Jersey |
| 68 | Stephen Jr. Kozlowski | 1 | Son | — | New Jersey |
| 69 | John Kozlowski THIS PERSON | 0 | Son | — | New Jersey |
| 70 | James Burns | 26 | Head | Sample | New Jersey |
| 71 | Nell Burns | 24 | Wife | — | New Jersey |
| 72 | Bruce Roop | 17 | Boarder | Laborer | New Jersey |
| 73 | Nick Naby | 18 | Boarder | Laborer | New Jersey |
| 74 | James Dick | 44 | Head | Manager | Scotland |
| 75 | Marion Dick | 47 | Wife | — | Scotland |
| 76 | Caroline Dick | 16 | Daughter | — | Scotland |
| 77 | Louise Dick | 11 | Daughter | — | New Jersey |
| 78 | Charles Bacon | 23 | Head | Laborer | New Jersey |
| 79 | Douglas Bacon | 21 | Brother | Clerk | New Jersey |
| 80 | Walter Ohler | 42 | Head | Cook | France |
| 81 | Anna Ohler | 26 | Wife | — | New Jersey |
| 82 | Gilbert Ohler | 14 | Son | — | New Jersey |
| 83 | Rita Ohler | 13 | Daughter | — | New Jersey |
| 84 | Marion Ohler | 12 | Daughter | — | New Jersey |
| 85 | Dorothy Ohler | 10 | Daughter | — | New Jersey |
| 86 | Harold Wood | 35 | Head | Conductor | New Jersey |
| 87 | Bernice Wood | 31 | Wife | — | New Jersey |
| 88 | Nelson Wood | 9 | Son | — | New Jersey |
| 89 | June Wood | 7 | Daughter | — | New Jersey |
| 90 | Marjorie Wood | 6 | Daughter | — | New Jersey |
| 91 | George Wood | 4 | Son | — | New Jersey |
| 92 | George Wood | 2 | Son | — | New Jersey |
| 93 | Andrew Wood | 1 | Son | — | New Jersey |
| 94 | Andrew Melrose | 20 | Head | Laborer | New Jersey |
| 95 | Michael Melrose | 19 | Brother | Shipper Clerk | New Jersey |
| 96 | Andrew Melrose | 52 | Father | — | New Jersey |
| 97 | Andrew Ludowich | 52 | Head | Machinist | New Jersey |
| 98 | Mary Ludowich | 47 | Wife | — | New Jersey |
| 99 | Mary Ludowich | 21 | Daughter | Stenographer | New Jersey |
| 100 | Julia Ludowich | 23 | 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)