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Mary Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Passaic-County, New Jersey
Our Model Tree links this Mary Kowalski across the 1920, 1930 and 1940 US Censuses in Passaic-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 5-person household.
Age 42
b. ~1898
Female
Spouse
Born: Austria
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Passaic-County, New Jersey |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Austria |
| 1935 Residence (City) | Pompton Lakes |
| 1935 Residence (County) | Passaic |
| Naturalization Status | First papers filed |
| Additional Details | |
| Occupation | Household |
| Industry | Housework |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 104 |
| Highest Grade | 6 |
| 1935 Residence | Same Place |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
| Occupation | Household |
| Township / Ward | Pompton Lakes |
| Est. Birth Year | ~1898 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Kowalski | Daughter | — | 14 | ~1926 |
| Mary Kowalski | Spouse | — | 42 | ~1898 |
| Roman Kowalski | Head | — | 56 | ~1884 |
| Stanley Domaracki | Other | — | 25 | ~1915 |
| Joseph Domaracki | Other | — | 20 | ~1920 |
Census Appearances
1920
Mercer, New …
Spouse, age 21
Mercer, New Jersey · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Austria |
| Year of Immigration | 1915 |
| Naturalization Status | Alien |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Mother Tongue | Polish |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
1930
Union, New …
Spouse, age 31
Union, New Jersey · implied b. ~1899 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Austria |
| Naturalization Status | Alien |
| Year of Immigration | 1915 |
| Age at First Marriage | 16 |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Can Read/Write | Yes |
| Mother Tongue | Ukrainian |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
1940
Passaic-County, New …
Spouse, age 42
Passaic-County, New Jersey · implied b. ~1898 — 5 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Austria |
| 1935 Residence (City) | Pompton Lakes |
| 1935 Residence (County) | Passaic |
| Naturalization Status | First papers filed |
| Occupation | Household |
| Industry | Housework |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 104 |
| Highest Grade | 6 |
| 1935 Residence | Same Place |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
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 Mary Kowalski across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Kowalski
Spouse · 1940 · age 42 · b. ~1898 · New Jersey
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Passaic-County, New Jersey
Open full size
1940 US Federal Census — Passaic-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02379-00060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Conrad Lyman | 6 | Head | — | New Jersey |
| 42 | Agnes Lockwood | 38 | Head | Secretary | New York |
| 43 | William Lockwood | 17 | Son | — | New Jersey |
| 44 | Minnie Huber | 66 | Lodger | — | Ohio |
| 45 | William Benjamin | 33 | Head | Dealer | New Jersey |
| 46 | Elizabeth Benjamin | 32 | Wife | — | New Jersey |
| 47 | William Benjamin | 13 | Son | — | New Jersey |
| 48 | Allan Benjamin | 12 | Son | — | New Jersey |
| 49 | Richard Benjamin | 10 | Son | — | New Jersey |
| 50 | William Hansen | 35 | Head | Insulator | Alabama |
| 51 | Alice Hansen | 30 | Wife | Insulator | New Jersey |
| 52 | Martha Hansen | 7 | Daughter | — | New Jersey |
| 53 | Hubert Klein | 29 | Head | Salesman | New York |
| 54 | Bertha Klein | 30 | Wife | — | Poland |
| 55 | Roman Kowalski | 56 | Head | — | Poland |
| 56 | Mary Kowalski THIS PERSON | 42 | Wife | Household | Austria |
| 57 | Stanley Domaracki | 25 | Step-son | Weaver | New York |
| 58 | Joseph Domaracki | 20 | Step-son | Clerk | New York |
| 59 | Helen Kowalski | 14 | Daughter | — | New Jersey |
| 60 | Carl Sacher | 36 | Head | Foreman | New Jersey |
| 61 | Gertrude Sacher | 30 | Wife | Warper | New Jersey |
| 62 | Priscilla Sacher | 8 | Daughter | — | New Jersey |
| 63 | William Rath | 51 | Head | Electrician | Germany |
| 64 | Jenny Rath | 58 | Wife | — | Germany |
| 65 | Jack Rizzo | 32 | Head | Clerk | New Jersey |
| 66 | Elizabeth Rizzo | 34 | Wife | — | New Jersey |
| 67 | Betty Rizzo | 11 | Daughter | — | New Jersey |
| 68 | Jack Rizzo | 7 | Son | — | New Jersey |
| 69 | Helene Rizzo | 3 | Daughter | — | New Jersey |
| 70 | Werner Lansburg | 41 | Head | Foreman | Germany |
| 71 | Elsie Lansburg | 39 | Wife | — | New Jersey |
| 72 | Werner Jr Lansburg | 14 | Son | — | New Jersey |
| 73 | Theodore Winne | 31 | Head | Clerk | New York |
| 74 | Ann Winne | 29 | Wife | Clerk | New Jersey |
| 75 | Patricia Winne | 4 | Daughter | — | New Jersey |
| 76 | William Monks | 34 | Head | Carpenter | New Jersey |
| 77 | Flora Monks | 32 | Wife | — | New Jersey |
| 78 | William Monks | 11 | Son | — | New Jersey |
| 79 | Betty Lou Monks | 6 | Daughter | — | New Jersey |
| 80 | Elaine Monks | 4 | Daughter | — | New Jersey |
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)