FK
Frank Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Frank Kowalski across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Frank & Tony — first a head (b.~1904), then head of a 3-person household.
Age 36
b. ~1904
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Beautician |
| Industry | Beaut shop |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 700 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Beautician |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1904 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Frank Kowalski | Head | — | 36 | ~1904 |
| Mary Kowalski | Spouse | — | 26 | ~1914 |
| Diana Kowalski | Daughter | — | 7 | ~1933 |
Census Appearances
1920
Cook, Illinois
Son, age 14
Cook, Illinois · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 25
Cook, Illinois · implied b. ~1905 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Printer |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 36
Cook-County, Illinois · implied b. ~1904 — 3 household members
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Beautician |
| Industry | Beaut shop |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 700 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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. Identified parents: father Frank Kowalski (~0.92 confidence) and father Tony Kowalski (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Kowalski
b. ~1876
Source father
● Household
· direct · ~0.92
Father
Tony Kowalski
b. ~1880
Source father
● Household
· direct · ~0.92
This person
Anchor record
Frank Kowalski
Head · 1940 · age 36 · b. ~1904 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00936-00650)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy Kowalaski | 17 | daughter | None | Illinois |
| 2 | Sylvia Kowalaski | 17 | daughter | None | Illinois |
| 3 | Frank Kowalski THIS PERSON | 36 | Head | Beautician | Illinois |
| 4 | Mary Kowalski | 26 | wife | Butcher | Illinois |
| 5 | Diana Marie Kowalski | 7 | daughter | — | Illinois |
| 6 | Joseph Kozubowski | 61 | Head | Chipper | Poland |
| 7 | Joseph Janich | 45 | partner | — | Poland |
| 8 | Sophie Zachocki | 65 | Head | — | Poland |
| 9 | Alec Zachocki | 36 | son | Laborer | Illinois |
| 10 | Dorothy Zachocki | 15 | daughter | — | Illinois |
| 11 | Edward Zachocki | 13 | son | — | Illinois |
| 12 | Raymond Zachocki | 12 | son | — | Illinois |
| 13 | Frank Kowalski | 55 | Head | Laborer | Poland |
| 14 | Francis Kowalski | 54 | wife | — | Poland |
| 15 | Emily Kowalski | 25 | daughter | Housework | Illinois |
| 16 | Joseph Kowalski | 24 | son | Laborer | Illinois |
| 17 | Stanley Kowalski | 21 | son | Laborer | Illinois |
| 18 | Mary Kowalski | 20 | daughter | Machine Operator | Illinois |
| 19 | Virginia Kowalski | 16 | daughter | — | Illinois |
| 20 | John Kowalski | 13 | son | — | Illinois |
| 21 | Rudolph Szewczyk | 24 | Head | Scrap Hoist Operator | Texas |
| 22 | Chester Szewczyk | 23 | wife | Curtain Maker | Illinois |
| 23 | John Glowacki | 40 | Head | Gas Operator | Poland |
| 24 | Wanda Glowacki | 30 | wife | — | Illinois |
| 25 | Kasimir Glowacki | 67 | Head | — | Poland |
| 26 | Michalena Glowacki | 67 | wife | — | Poland |
| 27 | Stella Glowacki | 30 | daughter | Folder | Illinois |
| 28 | Micky Glowacki | 28 | son | Chipper | Illinois |
| 29 | Walter Glowacki | 26 | son | Chipper | Illinois |
| 30 | Cecilia Glowacki | 25 | daughter | — | Illinois |
| 31 | Mitchell Mihaljevich | 23 | Head | Tube Cutter | Minnesota |
| 32 | Sophie Mihaljevich | 23 | wife | Label Pieces | Illinois |
| 33 | Stephen Adams | 33 | Head | Rougher | Illinois |
| 34 | Anastasia Adams | 33 | wife | Packer | Illinois |
| 35 | Andrew Adams | 7 | son | — | Illinois |
| 36 | Alvin Szajkowski | 30 | Head | Crane Operator | Wisconsin |
| 37 | Lottie Szajkowski | 33 | wife | — | Illinois |
| 38 | Robert Szajkowski | 0 | son | — | Illinois |
| 39 | Michal Siutka | 49 | Head | Conductor | Poland |
| 40 | Mary Siutka | 44 | wife | — | Poland |
Pedigree Summary
Frank
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)