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Joseph Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Joseph Kowalski across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Frank & Joseph — first a son (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kowalski |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Clerk |
| Industry | Office Work |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1488 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1912 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joseph | Age | Birth yr |
|---|---|---|---|---|
| Joseph Kowalski | Son | — | 28 | ~1912 |
| Peter Kowalski | Son | — | 23 | ~1917 |
| Helen Kowalski | Daughter | — | 25 | ~1915 |
| Frank Kowalski | Head | — | 51 | ~1889 |
| Katherine Kowalski | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Allegheny, Pennsylvania
Son, age 7
Allegheny, Pennsylvania · implied b. ~1913 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Son, age 17
Allegheny, Pennsylvania · implied b. ~1913 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Joseph Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Labor |
| Industry | Cork Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 28
Allegheny-County, Pennsylvania · implied b. ~1912 — 5 household members
| Surname | Kowalski |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Clerk |
| Industry | Office Work |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1488 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Joseph 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 Joseph Kowalski (~0.92 confidence) and father William Kowalski (~0.92 confidence) and mother Katherine Kowalski (~0.92 confidence) and mother Pauline Kowalski (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Kowalski
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Joseph Kowalski
b. ~1875
Source father
● Household
· direct · ~0.92
Father
William Kowalski
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Katherine Kowalski
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Pauline Kowalski
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Joseph Kowalski
Son · 1940 · age 28 · b. ~1912 · Pennsylvania
★ You are viewing this record
Sibling
Peter Kowalski
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1940 · age 25
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03657-00389)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gennieve Bazalewski | 16 | Lodger | Domestic | Pennsylvania |
| 42 | Eleanor Brick | 20 | Lodger | Waitress | Pennsylvania |
| 43 | Margaret Butki | 29 | Lodger | Laundry | Austria |
| 44 | Sophie Bazalewski | 22 | Lodger | Domestic | Pennsylvania |
| 45 | Violet Bienick | 22 | Lodger | Laundry | Pennsylvania |
| 46 | Helen Kubowich | 27 | Lodger | Domestic | Pennsylvania |
| 47 | Anthony Steppling | 42 | Head | Layer Out | Germany |
| 48 | Helen Steppling | 41 | Wife | — | Pennsylvania |
| 49 | Raymond Steppling | 20 | Son | Draftsman | Pennsylvania |
| 50 | Mary Steppling | 18 | Daughter | — | Pennsylvania |
| 51 | John Steppling | 16 | Son | — | Pennsylvania |
| 52 | Donald Steppling | 10 | Son | — | Pennsylvania |
| 53 | Florence Steppling | 8 | Daughter | — | Pennsylvania |
| 54 | Norbert Steppling | 3 | Son | — | Pennsylvania |
| 55 | Ann Marie Steppling | 0 | Daughter | — | Pennsylvania |
| 56 | Peter Bock | 51 | Head | Clerk | Pennsylvania |
| 57 | Agnes Bock | 48 | Wife | — | Pennsylvania |
| 58 | George Bock | 23 | Son | — | Pennsylvania |
| 59 | Genevieve Bock | 22 | Daughter | New Worker | Pennsylvania |
| 60 | Robert Bock | 19 | Son | New Worker | Pennsylvania |
| 61 | Walter Bock | 13 | Son | — | Pennsylvania |
| 62 | Kenneth Bock | 10 | Son | — | Pennsylvania |
| 63 | Alfred Bridge | 65 | Head | Watchman | Pennsylvania |
| 64 | Mary Bridge | 60 | Wife | — | Pennsylvania |
| 65 | Alice Bridge | 36 | Daughter | — | Pennsylvania |
| 66 | Edward Bridge | 15 | Son | — | Pennsylvania |
| 67 | Jacob Wertz | 54 | Head | Plumber | Pennsylvania |
| 68 | Anna Agnes Wertz | 54 | Wife | — | Pennsylvania |
| 69 | Frank Kowalski | 51 | Head | Labor | Pennsylvania |
| 70 | Katherine Kowalski | 48 | Wife | — | Pennsylvania |
| 71 | Joseph Kowalski THIS PERSON | 28 | Son | Clerk | Pennsylvania |
| 72 | Helen Kowalski | 25 | Daughter | Messenger | Pennsylvania |
| 73 | Peter Kowalski | 23 | Son | Clerk-File | Pennsylvania |
| 74 | Elmer Bridge | 39 | Head | Reader | Pennsylvania |
| 75 | May Bridge | 39 | Wife | — | Pennsylvania |
| 76 | John Shaughnessy | 37 | Brother-in-law | Clerk-Court | Pennsylvania |
| 77 | Mildred Shaughnessy | 26 | Sister-in-law | — | Pennsylvania |
| 78 | James J. Curley | 62 | Head | Bartender | New Jersey |
| 79 | Catherine C. Curley | 64 | Wife | — | Pennsylvania |
| 80 | Bridget Reynolds | 60 | Lodger | — | Eire |
Pedigree Summary
Joseph + 2 siblings
Gen 1 · 5 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)