FK
Frank Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Milwaukee-County, Wisconsin
Our Model Tree links this Frank Kowalski across the 1920, 1930 and 1940 US Censuses in Milwaukee-County, Wisconsin (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 6-person household.
Age 58
b. ~1882
Male
Head
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Milwaukee-County, Wisconsin |
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Milwaukee |
| 1935 Residence (County) | Milwaukee |
| Additional Details | |
| Occupation | Molder |
| Industry | Mfg. |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 338 |
| Highest Grade | No 0 |
| 1935 Residence | Same House |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Molder |
| Township / Ward | Milwaukee |
| Est. Birth Year | ~1882 |
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 Frank | Age | Birth yr |
|---|---|---|---|---|
| Mary Kowalski | Spouse | — | 58 | ~1882 |
| Alfred Kowalski | Son | — | 17 | ~1923 |
| Frank Kowalski | Head | — | 58 | ~1882 |
| Albert Kowalski | Son | — | 23 | ~1917 |
| Ann Kowalski | Daughter | — | 27 | ~1913 |
| Raymond Kowalski | Son | — | 20 | ~1920 |
Census Appearances
1920
Milwaukee, Wisconsin
Head, age 36
Milwaukee, Wisconsin · implied b. ~1884 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Wisconsin |
| Birth Country | United States |
| Year of Naturalization | F |
| Birthplace (normalized) | wisconsin |
1930
Milwaukee, Wisconsin
Head, age 47
Milwaukee, Wisconsin · implied b. ~1883 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalsky |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 30 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Proprietor |
| Industry | Drugstore |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | $5000 |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Milwaukee-County, Wisconsin
Head, age 58
Milwaukee-County, Wisconsin · implied b. ~1882 — 6 household members
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Milwaukee |
| 1935 Residence (County) | Milwaukee |
| Occupation | Molder |
| Industry | Mfg. |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 338 |
| Highest Grade | No 0 |
| 1935 Residence | Same House |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 Frank Kowalski across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Frank Kowalski
Head · 1940 · age 58 · b. ~1882 · 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
18 people indexed on this census page (nara:1940:m-t0627-04564-00143)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rose Pope | 41 | Wife | Sales Lady | Wisconsin |
| 2 | Laverne Pope | 19 | Daughter | Sales Lady | Wisconsin |
| 3 | William Statt | 72 | Father-in-law | — | Wisconsin |
| 4 | Herman Nanke | 36 | Brother-in-law | Yard Collector | Wisconsin |
| 5 | Frank Kowalski THIS PERSON | 58 | Head | Molder | Wisconsin |
| 6 | Mary Kowalski | 58 | Wife | — | Wisconsin |
| 7 | Ann Kowalski | 27 | Daughter | Sales Clerk | Wisconsin |
| 8 | Albert Kowalski | 23 | Son | Machinist | Wisconsin |
| 9 | Raymond Kowalski | 20 | Son | Machinist | Wisconsin |
| 10 | Alfred Kowalski | 17 | Son | — | Wisconsin |
| 11 | Michael Zachowski | 73 | Head | — | Poland |
| 12 | Catherine Zachowski | 66 | Wife | — | Poland |
| 13 | Stanley Butkowski | 32 | Head | Core Maker | Wisconsin |
| 14 | Frances Butkowski | 25 | Wife | — | Wisconsin |
| 15 | Gordon Butkowski | 2 | Son | — | Wisconsin |
| 16 | John Mrotek | 34 | Head | Maintenance | Wisconsin |
| 17 | Vanda Mrotek | 30 | Wife | — | Wisconsin |
| 18 | Ronald Mrotek | 9 | Son | — | Wisconsin |
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)