JK
John Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Fairfield-County, Connecticut
Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Fairfield-County, Connecticut (XGBoost, ~Confirmed), with identified parents Walter & Charlotte — first a son (b.~1907), then head of a 4-person household.
Age 33
b. ~1907
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Fairfield-County, Connecticut |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Bridgeport City |
| 1935 Residence (County) | Fairfield |
| Additional Details | |
| Occupation | Plumber |
| Industry | Bldg. Constr. |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Plumber |
| Township / Ward | Bridgeport City |
| Est. Birth Year | ~1907 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bernard Kowalski | Son | — | 35 | ~1905 |
| Walter Kowalski | Head | — | 64 | ~1876 |
| Charlotte Kowalski | Spouse | — | 63 | ~1877 |
| John Kowalski | Son | — | 33 | ~1907 |
Census Appearances
1920
Hartford, Connecticut
Son, age 11
Hartford, Connecticut · implied b. ~1909 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Fairfield, Connecticut
Son, age 22
Fairfield, Connecticut · implied b. ~1908 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Connecticut |
| Mother's Birthplace | Connecticut |
| Occupation | Inspector |
| Industry | Dept of Agriculture |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Fairfield-County, Connecticut
Son, age 33
Fairfield-County, Connecticut · implied b. ~1907 — 4 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Bridgeport City |
| 1935 Residence (County) | Fairfield |
| Occupation | Plumber |
| Industry | Bldg. Constr. |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Kowalski across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Walter Kowalski (~0.92 confidence) and mother Charlotte Kowalski (~0.92 confidence) and father John Kowalski (~0.92 confidence) and father John Kowalski (~0.92 confidence) and mother Annie Kowalski (~0.92 confidence) and mother Wanda Kowalski (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Walter Kowalski
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Charlotte Kowalski
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
John Kowalski
b. ~1880
Source father
● Household
· direct · ~0.92
Father
John Kowalski
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Annie Kowalski
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Wanda Kowalski
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Kowalski
Son · 1940 · age 33 · b. ~1907 · Connecticut
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Sibling
Bernard Kowalski
Sibling · 1940 · age 35
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
1940 US Federal Census — Fairfield-County, Connecticut
Open full size
1940 US Federal Census — Fairfield-County, Connecticut
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00533-01125)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Q. Weber | 35 | Head | Mach. Operator | New York |
| 2 | Malvina Swank | 52 | Mother | — | New York |
| 3 | Edward Rameika | 25 | Head | Truck Driver | Conn |
| 4 | Constance Rameika | 22 | Wife | — | Italy |
| 5 | Edward Rameika | 1 | Son | — | Conn |
| 6 | Robert Rameika | 0 | Son | — | Conn |
| 7 | Walter R. Ellison | 22 | Head | Laborer | Conn |
| 8 | Ella Ellison | 21 | Wife | — | Conn |
| 9 | Beverley Ellison | 2 | Daughter | — | Conn |
| 10 | Bertha Ellison | 61 | Mother | — | Conn |
| 11 | Jessie Bell | 52 | Head | — | N.Y. |
| 12 | George Foulk | 47 | Head | Machinist | Penn |
| 13 | Frances Foulk | 33 | Wife | — | Penn |
| 14 | Orville Foulk | 5 | Son | — | N.Y. |
| 15 | Helen Foulk | 3 | Daughter | — | Conn |
| 16 | Alicia Foulk | 1 | Daughter | — | Conn |
| 17 | Ruby Helen Foulk | 16 | Daughter | Domestic | Conn |
| 18 | Henry Geissler | 32 | Head | Aircraft Mechanic | Germany |
| 19 | Irma Geissler | 30 | Wife | — | Germany |
| 20 | Lehnert Geissler | 2 | Son | — | Conn |
| 21 | Walter Kowalski | 64 | Head | Heat Treating | Poland |
| 22 | Charlotte Kowalski | 63 | Wife | — | Poland |
| 23 | John Kowalski THIS PERSON | 33 | Son | Plumber | New York |
| 24 | Bernard Kowalski | 35 | Son | Guard | New York |
| 25 | Rollin Macginniss | 51 | Head | Newsdealer | Conn |
| 26 | Ethel Macginniss | 50 | Wife | — | Mass |
| 27 | Wm. R. Nolan | 23 | Head | Apprentice Plasterer | Conn |
| 28 | Jean Nolan | 21 | Wife | Packing | Conn |
| 29 | Patricia Nolan | 1 | Daughter | — | Conn |
| 30 | Walter Malec | 25 | Head | Truck Driver | Conn |
| 31 | Lottie Malec | 23 | Wife | — | Conn |
| 32 | Joseph Sachi | 48 | Head | Mech. Engineer | Austria |
| 33 | Wanda Sachi | 41 | Wife | — | Conn |
| 34 | Wanda Sachi | 12 | Daughter | — | Conn |
| 35 | Lawrence Sachi | 10 | Son | — | Conn |
| 36 | Helen Simard | 51 | Head | — | Conn |
| 37 | Leon Simard | 18 | Son | Shipping Clerk | Conn |
| 38 | Catherine Hearn | 26 | Daughter | School Teacher | Conn |
| 39 | William Fanat | 20 | Head | Machinist | Penn |
Pedigree Summary
John + 1 sibling
Gen 1 · 6 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)