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John Kozlowski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · None, New York
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in New York (XGBoost, ~Confirmed) — first a head (b.~1902), then head of a 15-person household.
Age 28
b. ~1902
Male
Head
Born: Poland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | None, New York |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1924 |
| Age at First Marriage | 22 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Home Owned/Rented | R |
| Home Value / Rent | 25.00 |
| Veteran | No |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | New York City |
| Est. Birth Year | ~1902 |
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.
15 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Helen Kozlowski | Daughter | — | 1 | ~1929 |
| Helen Kozlowski | Daughter | — | 4 | ~1926 |
| Edward Kozlowski | Son | — | 1 | ~1929 |
| Frank Kozlowski | Son | — | 1 | ~1929 |
| Stella Kozlowski | Daughter | — | 1 | ~1929 |
| John Kozlowski | Son | — | 5 | ~1925 |
| Mary Kozlowski | Spouse | — | 22 | ~1908 |
| Mary Kozlowski | Other | — | 40 | ~1890 |
| Antoinette Kozlowski | Daughter | — | 11 | ~1919 |
| Mary Kozlowski | Daughter | — | 1 | ~1929 |
| John Kozlowski | Son | — | 1 | ~1929 |
| John Kozlowski | Head | — | 28 | ~1902 |
| Joseph Kozlowski | Son | — | 4 | ~1926 |
| Stella Kozlowski | Daughter | — | 1 | ~1929 |
| Frank Kozlowski | Son | — | 3 | ~1927 |
Census Appearances
1930
None, New …
Head, age 28
None, New York · implied b. ~1902 — 15 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1924 |
| Age at First Marriage | 22 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Home Owned/Rented | R |
| Home Value / Rent | 25.00 |
| Veteran | No |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Niagara-County, New …
Head, age 37
Niagara-County, New York · implied b. ~1903 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kuzlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Niagara Falls |
| 1935 Residence (County) | Niagara |
| Naturalization Status | Naturalized |
| Occupation | Laborer |
| Industry | Mfg Chemical |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 600 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
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.
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This person
Anchor record
John Kozlowski
Head · 1930 · age 28 · b. ~1902 · New York
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — None, New York
Open full size
1930 US Federal Census — None, New York
Page Contents
50 people indexed on this census page (ia:1930:newyorkcensus00reel1587:0326)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Mulligan | 56 | Head | — | New York |
| 2 | Alice Mulligan | 14 | Daughter | — | New York |
| 3 | Eileen Mulligan | 12 | Daughter | — | New York |
| 4 | Andrew Mulligan | 10 | Son | — | New York |
| 5 | John Kasper | 35 | Head | Manager | New York |
| 6 | Julia Kasper | 33 | Wife | — | Poland |
| 7 | John Kasper | 11 | Son | — | New York |
| 8 | Edward Kasper | 9 | Son | — | New York |
| 9 | Robert Kasper | 4 | Son | — | New York |
| 10 | Frank Kozlowski | 40 | Head | Organist | Poland |
| 11 | Stella Kozlowski | 34 | Wife | — | Poland |
| 12 | Julia Kozlowski | 5 | Daughter | — | Massachusetts |
| 13 | Matthew Dabrowski | 14 | Step-son | Gen. Clerk | Connecticut |
| 14 | Walter Wasielewski | 23 | Head | — | Poland |
| 15 | Alice Wasielewski | 23 | Wife | — | New York |
| 16 | Joseph Wasielewski | 24 | Head | — | Poland |
| 17 | Mary Wasielewski | 21 | Wife | — | New York |
| 18 | Joseph Wasielewski | 1 | Son | — | New York |
| 19 | John Kozlowski THIS PERSON | 28 | Head | — | Poland |
| 20 | Mary Kozlowski | 22 | Wife | — | Poland |
| 21 | John Kozlowski | 5 | Son | — | New York |
| 22 | Helen Kozlowski | 4 | Daughter | — | New York |
| 23 | Frank Kozlowski | 3 | Son | — | New York |
| 24 | Stella Kozlowski | 1 | Daughter | — | New York |
| 25 | Mary Kozlowski | 40 | Mother | Laborer | Poland |
| 26 | Antoinette Kozlowski | 11 | Daughter | — | New York |
| 27 | Joseph Kozlowski | 4 | Son | — | New York |
| 28 | John Kozlowski | 1 | Son | — | New York |
| 29 | Stella Kozlowski | 1 | Daughter | — | New York |
| 30 | Mary Kozlowski | 1 | Daughter | — | New York |
| 31 | Frank Kozlowski | 1 | Son | — | New York |
| 32 | Helen Kozlowski | 1 | Daughter | — | New York |
| 33 | Edward Kozlowski | 1 | Son | — | New York |
| 34 | John Kozlowski | 35 | Head | Janitor | Poland |
| 35 | Mary Kozlowski | 30 | Wife | — | Poland |
| 36 | Walter Kozlowski | 11 | Son | — | New York |
| 37 | Edward Kozlowski | 10 | Son | — | New York |
| 38 | Eleanor Kozlowski | 8 | Daughter | — | New York |
| 39 | John Kozlowski | 6 | Son | — | New York |
| 40 | Frank Kozlowski | 4 | Son | — | New York |
| 41 | Joseph Kozlowski | 1 | Son | — | New York |
| 42 | John Kozlowski | 42 | Head | Operator | Poland |
| 43 | Sophie Kozlowski | 40 | Wife | — | Poland |
| 44 | John Kozlowski | 14 | Son | — | New York |
| 45 | Helen Kozlowski | 10 | Daughter | — | New York |
| 46 | Stella Kozlowski | 8 | Daughter | — | New York |
| 47 | Walter Kozlowski | 37 | Head | Laborer | Poland |
| 48 | Stella Kozlowski | 34 | Wife | — | Poland |
| 49 | Stanley Kozlowski | 7 | Son | — | New York |
| 50 | Jennie Kozlowski | 5 | Daughter | — | New York |
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)