JK
John Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Connecticut
Our Model Tree links this John Kowalski across the 1930 and 1940 US Censuses in Middlesex-County, Connecticut (XGBoost, ~Confirmed) — first a son (b.~1916), then head of a 10-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Connecticut |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Middletown City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Drill Press Operator |
| Industry | Typewriter Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Drill Press Operator |
| Township / Ward | Middletown City |
| Est. Birth Year | ~1916 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Rose Kowalski | Spouse | — | 44 | ~1896 |
| Rose Kowalski | Daughter | — | 19 | ~1921 |
| Josephine Kowalski | Daughter | — | 23 | ~1917 |
| Stanley Kowalski | Son | — | 20 | ~1920 |
| Theresa Kowalski | Daughter | — | 12 | ~1928 |
| Edward Kowalski | Son | — | 14 | ~1926 |
| Walter Kowalski | Son | — | 6 | ~1934 |
| Charles Kowalski | Son | — | 16 | ~1924 |
| John Kowalski | Son | — | 24 | ~1916 |
| Peter Kowalski | Head | — | 45 | ~1895 |
Census Appearances
1930
New London, …
Son, age 14
New London, Connecticut · implied b. ~1916 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalsky |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Connecticut
Son, age 24
Middlesex-County, Connecticut · implied b. ~1916 — 10 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Middletown City |
| 1935 Residence (County) | Middlesex |
| Occupation | Drill Press Operator |
| Industry | Typewriter Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 24 · b. ~1916 · Connecticut
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Sibling
Edward Kowalski
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Kowalski
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Kowalski
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Kowalski
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Kowalski
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Kowalski
Sibling · 1940 · age 19
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 — Middlesex-County, Connecticut
Open full size
1940 US Federal Census — Middlesex-County, Connecticut
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00512-00938)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth J. Sauer | 65 | Head | Bookkeeper | Connecticut |
| 2 | Charles M. Sauer | 63 | Brother | Wholesale Oil Salesman | Connecticut |
| 3 | Howard Young | 55 | Head | Fireman | Connecticut |
| 4 | Margaret S. Young | 53 | Wife | — | Connecticut |
| 5 | Agnes M. Young | 26 | Daughter | Audit Clerk | Connecticut |
| 6 | Irene Young | 24 | Daughter | — | Connecticut |
| 7 | Leroy Wilcox | 41 | Head | — | Connecticut |
| 8 | John J. Dougherty | 44 | Head | Cutting Supervisor | Connecticut |
| 9 | Elsie S. Dougherty | 39 | Wife | Inspector | Connecticut |
| 10 | Rose D. Emanuele | 30 | Head | Office Clerk | Connecticut |
| 11 | Elizabeth Emanuele | 21 | Sister | Nurse'S Aid | Connecticut |
| 12 | Joseph Emanuele | 71 | Father | — | Italy |
| 13 | William W. Miller | 49 | Head | Paper Box Manufacturer | New Jersey |
| 14 | Lillian M. Miller | 38 | Wife | — | Connecticut |
| 15 | John Hyznar | 46 | Head | Weaver | Poland |
| 16 | Gloria Hyznar | 48 | Wife | — | Poland |
| 17 | Frederick J. Hyznar | 25 | Son | Packer | Connecticut |
| 18 | Mary J. Hyznar | 23 | Daughter | Tennis Shoe Maker | Connecticut |
| 19 | Joseph E. Hyznar | 19 | Son | Apprentice Tool Maker | Connecticut |
| 20 | Charles E. Kane | 70 | Head | — | New York |
| 21 | Alice M. Smith | 71 | Housekeeper | Housekeeper | Connecticut |
| 22 | Joseph Jurczak | 68 | Head | — | Poland |
| 23 | Julia Jurczak | 67 | Wife | — | Poland |
| 24 | Robert Jurczak | 39 | Son | — | Connecticut |
| 25 | Rose D. Jurczak | 36 | Daughter | Office Clerk | Connecticut |
| 26 | Lawrence Jurczak | 27 | Son | Tavern Keeper | Connecticut |
| 27 | Edward B. Jurczak | 25 | Son | Bootmaker | Connecticut |
| 28 | Joseph F. Pukel | 53 | Head | Shipping Clerk | New York |
| 29 | Mary E. Pukel | 51 | Wife | Cook | Irish Free State |
| 30 | Herbert J. Pukel | 21 | Son | Bus Boy | Connecticut |
| 31 | Peter P. Kowalski | 45 | Head | Janitor | Poland |
| 32 | Rose Kowalski | 44 | Wife | — | Poland |
| 33 | John Kowalski THIS PERSON | 24 | Son | Drill Press Operator | Massachusetts |
| 34 | Josephine Kowalski | 23 | Daughter | Assembler | Massachusetts |
| 35 | Stanley J. Kowalski | 20 | Son | Assembler | Massachusetts |
| 36 | Rose B. Kowalski | 19 | Daughter | Head Waitress | Massachusetts |
| 37 | Charles P. Kowalski | 16 | Son | New Worker | Massachusetts |
| 38 | Edward Kowalski | 14 | Son | — | Massachusetts |
| 39 | Theresa Kowalski | 12 | Daughter | — | Massachusetts |
| 40 | Walter Kowalski | 6 | Son | — | Connecticut |
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)