JK
John Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lackawanna-County, Pennsylvania
Our Model Tree links this John Kowalski across the 1930 and 1940 US Censuses in Lackawanna-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 13-person household.
Age 12
b. ~1928
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lackawanna-County, Pennsylvania |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Scranton |
| 1935 Residence (County) | Lackawanna |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Scranton |
| 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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lydia Kowalski | Spouse | — | 54 | ~1886 |
| Stanley Kowalski | Son | — | 17 | ~1923 |
| Frank Kowalski | Son | — | 3 | ~1937 |
| John Kowalski | Other | — | 1 | ~1939 |
| Helen Kowalski | Daughter | — | 14 | ~1926 |
| Frank Kowalski | Head | — | 55 | ~1885 |
| John Kowalski | Son | — | 12 | ~1928 |
| Chester Kowalski | Son | — | 26 | ~1914 |
| Anthony Kowalski | Son | — | 20 | ~1920 |
| Joseph Kowalski | Son | — | 11 | ~1929 |
| Anna Kowalski | Daughter | — | 21 | ~1919 |
| Edward Kowalski | Son | — | 9 | ~1931 |
| Regina Kowalski | Daughter | — | 19 | ~1921 |
Census Appearances
1930
Lackawanna, Pennsylvania
Son, age 1
Lackawanna, Pennsylvania · implied b. ~1929
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Czechoslovakia |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lackawanna-County, Pennsylvania
Son, age 12
Lackawanna-County, Pennsylvania · implied b. ~1928 — 13 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Scranton |
| 1935 Residence (County) | Lackawanna |
| Highest Grade | No 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 John Kowalski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1940 · age 12 · b. ~1928 · Pennsylvania
★ You are viewing this record
Sibling
Edward Kowalski
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Regina Kowalski
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kowalski
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Kowalski
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony Kowalski
Sibling · 1940 · age 20
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
Chester Kowalski
Sibling · 1940 · age 26
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 — Lackawanna-County, Pennsylvania
Open full size
1940 US Federal Census — Lackawanna-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03687-00287)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frederick Yablonsky | 2 | Daughter | — | Pennsylvania |
| 42 | Carl A Sladock | 58 | Head | Miner | Poland |
| 43 | Bernice Sladock | 21 | Daughter | Shipping Clerk | Pennsylvania |
| 44 | Edward Sladock | 16 | Son | — | West Virginia |
| 45 | Frank Sladock | 15 | Son | — | West Virginia |
| 46 | Fred Shemin | 45 | Head | Miner | Latvia |
| 47 | Mary Shemin | 31 | Wife | — | Poland |
| 48 | Richard Shemin | 8 | Son | — | New York |
| 49 | Joseph Rutkowski | 62 | Head | Miner | Poland |
| 50 | Pauline Rutkowski | 55 | Wife | — | Poland |
| 51 | Martin Rutkowski | 31 | Son | Miner | Pennsylvania |
| 52 | Henry R Rutkowski | 21 | Son | — | Pennsylvania |
| 53 | Edward Rutkowski | 17 | Son | — | Pennsylvania |
| 54 | Frank Kowalski | 55 | Head | Miner | Poland |
| 55 | Lydia Kowalski | 54 | Wife | — | Poland |
| 56 | Chester Kowalski | 26 | Son | Laborer | Pennsylvania |
| 57 | Anna Kowalski | 21 | Daughter | Housework | Pennsylvania |
| 58 | Anthony Kowalski | 20 | Son | Second Cook | Pennsylvania |
| 59 | Regina Kowalski | 19 | Daughter | Seamstress | Pennsylvania |
| 60 | Stanley Kowalski | 17 | Son | — | Pennsylvania |
| 61 | Helen Kowalski | 14 | Daughter | — | Pennsylvania |
| 62 | John Kowalski THIS PERSON | 12 | Son | — | Pennsylvania |
| 63 | Joseph Kowalski | 11 | Son | — | Pennsylvania |
| 64 | Edward Kowalski | 9 | Son | — | Pennsylvania |
| 65 | Frank Kowalski | 3 | Son | — | Pennsylvania |
| 66 | John Joseph Kowalski | 1 | Grandson | — | Pennsylvania |
| 67 | Alex Kowalski | 24 | Head | Laborer | Pennsylvania |
| 68 | Mary Kowalski | 23 | Wife | — | New York |
| 69 | Alice Kowalski | 4 | Daughter | — | Pennsylvania |
| 70 | John F Gostek | 55 | Head | Miner | Poland |
| 71 | Josephine Gostek | 47 | Wife | — | Pennsylvania |
| 72 | Althea Gostek | 23 | Daughter | Coner | Pennsylvania |
| 73 | John Gostek | 17 | Son | Helper-Truck | Pennsylvania |
| 74 | Joseph Yablonski | 30 | Head | Laborer | Pennsylvania |
| 75 | Evelyn Yablonski | 23 | Wife | — | Pennsylvania |
| 76 | Alice Yablonski | 4 | Daughter | — | Pennsylvania |
| 77 | Joseph Stachowicz | 49 | Head | Miner | Poland |
| 78 | Josephine Stachowicz | 46 | Wife | — | Poland |
| 79 | Anthony Stachowicz | 23 | Son | Laborer | Pennsylvania |
| 80 | Regina R Stachowicz | 19 | Daughter | Seamstress | 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)