FK
Frank Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Frank Kowalski across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 10-person household.
Age 12
b. ~1928
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1928 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Joseph Kowalski | Son | — | 22 | ~1918 |
| Steve Kowalski | Son | — | 21 | ~1919 |
| Frank Kowalski | Son | — | 12 | ~1928 |
| Mary Kowalski | Daughter | — | 18 | ~1922 |
| Casimir Kowalski | Son | — | 26 | ~1914 |
| Stella Kowalski | Daughter | — | 24 | ~1916 |
| Frances Kowalski | Daughter | — | 16 | ~1924 |
| Frank Kowalski | Head | — | 51 | ~1889 |
| Helen Kowalski | Daughter | — | 14 | ~1926 |
| Stella Kowalski | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 2
Allegheny, Pennsylvania · implied b. ~1928 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 12
Allegheny-County, Pennsylvania · implied b. ~1928 — 10 household members
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Highest Grade | No 5 |
| 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 Frank Kowalski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Frank Kowalski
Son · 1940 · age 12 · b. ~1928 · Pennsylvania
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Sibling
Joseph Kowalski
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Casimir Kowalski
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stella Kowalski
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Kowalski
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Steve Kowalski
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kowalski
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kowalski
Sibling · 1940 · age 18
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-t0627-03665-00169)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Kowalski | 51 | Head | Laborer | Poland |
| 2 | Stella Kowalski | 46 | Wife | — | Poland |
| 3 | Casimir Kowalski | 26 | Son | Brewer | Pennsylvania |
| 4 | Stella Kowalski | 24 | Daughter | Housework | Pennsylvania |
| 5 | Joseph Kowalski | 22 | Son | Laborer | Pennsylvania |
| 6 | Steve Kowalski | 21 | Son | Waiter | Pennsylvania |
| 7 | Mary Kowalski | 18 | Daughter | New Worker | Pennsylvania |
| 8 | Frances Kowalski | 16 | Daughter | — | Pennsylvania |
| 9 | Helen Kowalski | 14 | Daughter | — | Pennsylvania |
| 10 | Frank Kowalski THIS PERSON | 12 | Son | — | Pennsylvania |
| 11 | Ignacy Milinski | 61 | Head | Shearman | Poland |
| 12 | Josephine Milinski | 58 | Wife | — | Poland |
| 13 | Stanley Milinski | 18 | Son | New Worker | Pennsylvania |
| 14 | Mile Stanich | 42 | Head | Laborer | Yugoslavia |
| 15 | Rudy Stanich | 12 | Son | — | Pennsylvania |
| 16 | Rose Marie Stanich | 10 | Daughter | — | Pennsylvania |
| 17 | Steve Pust | 59 | Roomer | Laborer | Yugoslavia |
| 18 | Frank Milinski | 34 | Head | Laborer | Poland |
| 19 | Bertha Milinski | 24 | Wife | — | Pennsylvania |
| 20 | Ruth Milinski | 1 | Daughter | — | Pennsylvania |
| 21 | Carl Sells | 39 | Head | Speed Operator | Ohio |
| 22 | Ella Sells | 60 | Mother | — | Ohio |
| 23 | Margaret Sells | 14 | Niece | — | Ohio |
| 24 | Isidor Petraitis | 61 | Head | Laborer | Lithuania |
| 25 | Mary Petraitis | 53 | Wife | — | Lithuania |
| 26 | Joseph Petraitis | 26 | Son | Clerk | Pennsylvania |
| 27 | Raymond Davidson | 35 | Head | Postal Clerk | Pennsylvania |
| 28 | Mary Davidson | 31 | Wife | — | Pennsylvania |
| 29 | Mary C. Davidson | 3 | Daughter | — | Pennsylvania |
| 30 | Paul Davidson | 12 | Son | — | Pennsylvania |
| 31 | Arthur A. Ferry | 51 | Head | Laborer | Pennsylvania |
| 32 | Ida Ferry | 49 | Wife | — | Pennsylvania |
| 33 | Arthur A. Jr. Ferry | 28 | Son | Junior Inspector | Pennsylvania |
| 34 | Raymond Ferry | 20 | Son | New Worker | Pennsylvania |
| 35 | Catherine Daidam | 78 | Head | New Worker | Scotland |
| 36 | Thomas Daidam | 49 | Son | Craneman | Pennsylvania |
| 37 | Zygmont Kwiatkowski | 60 | Head | Laborer | Poland |
| 38 | Katherine Kwiatkowski | 50 | Wife | — | Poland |
| 39 | Mona Flowers | 27 | Daughter | Telephone Operator | Pennsylvania |
| 40 | Adolph Flowers | 24 | Son | Mechanic | Pennsylvania |
Related Census Records
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)