JK
John Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Milwaukee-County, Wisconsin
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Milwaukee-County, Wisconsin (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 6-person household.
Age 59
b. ~1881
Male
Head
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Milwaukee-County, Wisconsin |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | City of Milwaukee |
| 1935 Residence (County) | Milwaukee |
| Naturalization Status | First papers filed |
| Additional Details | |
| Occupation | laborer |
| Industry | railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 884 |
| Highest Grade | No 1 |
| 1935 Residence | Same house |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Occupation | Laborer |
| Township / Ward | City Of Milwaukee |
| Est. Birth Year | ~1881 |
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 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Jadwiga Kozlowski | Spouse | — | 52 | ~1888 |
| Dolores Kozlowski | Daughter | — | 11 | ~1929 |
| Walter Kozlowski | Son | — | 23 | ~1917 |
| John Kozlowski | Head | — | 59 | ~1881 |
| Joseph Kozlowski | Son | — | 26 | ~1914 |
| Raymond Kozlowski | Son | — | 19 | ~1921 |
Census Appearances
1930
Milwaukee, Wisconsin
Head, age 48
Milwaukee, Wisconsin · implied b. ~1882 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1900 |
| Age at First Marriage | 26 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Laborer |
| Industry | Steam Railway |
| Class of Worker | W |
| Can Read/Write | No |
| Mother Tongue | Polish |
| Home Owned/Rented | O |
| Home Value / Rent | 7250 |
| Radio Set | R |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Milwaukee-County, Wisconsin
Head, age 59
Milwaukee-County, Wisconsin · implied b. ~1881 — 6 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | City of Milwaukee |
| 1935 Residence (County) | Milwaukee |
| Naturalization Status | First papers filed |
| Occupation | laborer |
| Industry | railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 884 |
| Highest Grade | No 1 |
| 1935 Residence | Same house |
| 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 · 1940 · age 59 · b. ~1881 · Wisconsin
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Milwaukee-County, Wisconsin
Open full size
1940 US Federal Census — Milwaukee-County, Wisconsin
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-04548-00324)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Woeste | 16 | son | — | Wisconsin |
| 42 | Mary Joan Woeste | 14 | daughter | — | Wisconsin |
| 43 | David Woeste | 3 | son | — | Wisconsin |
| 44 | Martin Sum | 47 | Head | Tavern Keeper | Poland |
| 45 | Katherine Sum | 44 | wife | — | Poland |
| 46 | Harry Sum | 19 | son | — | Wisconsin |
| 47 | Helen Sum | 11 | daughter | — | Wisconsin |
| 48 | Fred Tora | 39 | Head | Laborer | Wisconsin |
| 49 | Helen Tora | 39 | wife | — | Wisconsin |
| 50 | Jack Mantel | 21 | son | Shipping Clerk | Wisconsin |
| 51 | Bernard Knitter | 33 | Head | Retail Grocery | Wisconsin |
| 52 | Ann Knitter | 33 | wife | — | Wisconsin |
| 53 | Anthony Skrobiszewski | 40 | Head | Machinist | Wisconsin |
| 54 | Regina Skrobiszewski | 34 | wife | — | Poland |
| 55 | Dorothy Skrobiszewski | 14 | daughter | — | Wisconsin |
| 56 | Delphine Skrobiszewski | 12 | daughter | — | Wisconsin |
| 57 | Raymond Skrobiszewski | 9 | son | — | Wisconsin |
| 58 | Richard Skrobiszewski | 1 | son | — | Wisconsin |
| 59 | Frank Krzyzanowski | 66 | Head | — | Poland |
| 60 | Josephine Krzyzanowski | 60 | wife | — | Poland |
| 61 | Alex Krzyzanowski | 26 | son | Truck Driver | Wisconsin |
| 62 | Lillian Krzyzanowski | 17 | daughter | — | Wisconsin |
| 63 | Theodore Badura | 44 | Head | Bowling Alley Operator | Wisconsin |
| 64 | Esther Badura | 34 | wife | Machine Operator | Wisconsin |
| 65 | George Waletzko | 41 | Head | Polisher | Wisconsin |
| 66 | Katherine Waletzko | 37 | wife | — | Wisconsin |
| 67 | Marian Waletzko | 15 | daughter | — | Wisconsin |
| 68 | Joseph Waletzko | 12 | son | — | Wisconsin |
| 69 | John Kozlowski THIS PERSON | 59 | Head | Laborer | Poland |
| 70 | Jadwiga Kozlowski | 52 | wife | — | Poland |
| 71 | Joseph Kozlowski | 26 | son | Laborer | Wisconsin |
| 72 | Walter Kozlowski | 23 | son | Machine Operator | Wisconsin |
| 73 | Raymond Kozlowski | 19 | son | — | Wisconsin |
| 74 | Dolores Kozlowski | 11 | daughter | — | Wisconsin |
| 75 | Frank Burnside | 29 | Head | Laborer | Canada |
| 76 | Verna Burnside | 21 | wife | — | Michigan |
| 77 | Gary Burnside | 2 | son | — | Wisconsin |
| 78 | Gloria Burnside | 0 | daughter | — | Wisconsin |
| 79 | Bernard Zanaki | 54 | Head | Fireman | Poland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)