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Mary Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Mary Leahy across the 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1892), then head of a 5-person household.
Age 48
b. ~1892
Female
Spouse
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1892 |
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 |
|---|---|---|---|---|
| Gertrude Quinn | Other | — | 16 | ~1924 |
| Mary Leahy | Spouse | — | 48 | ~1892 |
| William Leahy | Head | — | 46 | ~1894 |
| Ruth Leahy | Daughter | — | 19 | ~1921 |
| Marie Mcnigle | Other | — | 18 | ~1922 |
Census Appearances
1930
Hudson, New …
Spouse, age 38
Hudson, New Jersey · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 27 |
| Father's Birthplace | Louisiana |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Spouse, age 48
Hudson-County, New Jersey · implied b. ~1892 — 5 household members
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Leahy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leahy
Spouse · 1940 · age 48 · b. ~1892 · New Jersey
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Hudson-County, New Jersey
Open full size
1940 US Federal Census — Hudson-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02411-00427)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Kenneth Schwetze | 23 | Son | Truck Driver | New Jersey |
| 2 | Dorothy Schwetze | 21 | Daughter | — | New Jersey |
| 3 | Lillida Schwetze | 18 | Daughter | — | New Jersey |
| 4 | Edith Schwetze | 16 | Daughter | — | New Jersey |
| 5 | Emma Adelhardt | 75 | Mother | — | Germany |
| 6 | John Heck | 46 | Head | — | New Jersey |
| 7 | Birdie Heck | 44 | Wife | — | New Jersey |
| 8 | Bernard Heck | 23 | Son | Printer | New Jersey |
| 9 | John Heck | 16 | Son | — | New Jersey |
| 10 | Ruth Heck | 12 | Daughter | — | New Jersey |
| 11 | Joseph Kaiser | 42 | Head | Printer | New York |
| 12 | Marie Kaiser | 38 | Wife | — | New York |
| 13 | Eileen Kaiser | 10 | Daughter | — | New Jersey |
| 14 | William Leahy | 46 | Head | Dental Mech | New Jersey |
| 15 | Mary Leahy THIS PERSON | 48 | Wife | — | New Jersey |
| 16 | Ruth Leahy | 19 | Daughter | Hairdresser | New Jersey |
| 17 | Gertrude Quinn | 16 | Sister | — | New Jersey |
| 18 | Marie Mcnigle | 18 | Lodger | — | New Jersey |
| 19 | Leslie Maher | 29 | Head | Laundryman | New Jersey |
| 20 | Adeline Maher | 26 | Wife | — | New Jersey |
| 21 | Ronald Maher | 3 | Son | — | New Jersey |
| 22 | Gustave Frederick | 58 | Head | Lunchroom | New York |
| 23 | Florence Frederick | 54 | Wife | — | New York |
| 24 | Harry Burnaskas | 44 | Head | Laborer | Ireland |
| 25 | Elizabeth Burnaskas | 46 | Wife | — | Ireland |
| 26 | Betty Burnaskas | 19 | Daughter | — | New York |
| 27 | Harry Burnaskas | 18 | Son | Salesman | New York |
| 28 | Raymond Burnaskas | 14 | Son | — | New York |
| 29 | Letitia Burnaskas | 13 | Daughter | — | New York |
| 30 | Silas Brower | 54 | Head | Metalist | Father |
| 31 | Bertie Brower | 27 | Daughter | — | New Jersey |
| 32 | Samuel Brower | 20 | Son | — | New Jersey |
| 33 | Walter Rasmussen | 27 | Head | Shipworker | New Jersey |
| 34 | Dorothy Rasmussen | 28 | Wife | — | New Jersey |
| 35 | Robert Rasmussen | 3 | Son | — | New Jersey |
| 36 | George White | 36 | Head | Tender Rail | New Jersey |
| 37 | Emil Kressman | 55 | Head | Repairman | New Jersey |
| 38 | Helen Kressman | 52 | Wife | — | New Jersey |
| 39 | Emil Kressman | 24 | Son | Repairman | New Jersey |
| 40 | Harold Kressman | 22 | Son | Truck Driver | New Jersey |
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)