MD
Mary Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1895), then head of a 3-person household.
Age 45
b. ~1895
Female
Spouse
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1895 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Duffy | Head | — | 48 | ~1892 |
| George Duffy | Son | — | 24 | ~1916 |
| Mary Duffy | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Hudson, New …
Spouse, age 25
Hudson, New Jersey · implied b. ~1895 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Spouse, age 35
Hudson, New Jersey · implied b. ~1895 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 19 |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Spouse, age 45
Hudson-County, New Jersey · implied b. ~1895 — 3 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Class of Worker | 0 |
| Highest Grade | 8 |
| 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 Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duffy
Spouse · 1940 · age 45 · b. ~1895 · 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-t0627-02409-00127)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth Catuzzi | 7 | Daughter | — | New Jersey |
| 2 | Gilbert Brown | 32 | B in law | Washer | Conn. |
| 3 | Stanley Kaspazak | 32 | Head | Presser | New Jersey |
| 4 | Victoria Kaspazak | 29 | Wife | — | Pennsylvania |
| 5 | Doris Kaspazak | 2 | Daughter | — | New Jersey |
| 6 | Michael Dwyer | 42 | Head | Carpenter | New Jersey |
| 7 | Helen Dwyer | 39 | Wife | — | New Jersey |
| 8 | Catherine Dwyer | 19 | Daughter | Sales Lady | New Jersey |
| 9 | Francis Dwyer | 17 | Son | Clerk | New Jersey |
| 10 | Thomas Kiernan | 35 | Head | Bartender | New Jersey |
| 11 | Beatrice Kiernan | 32 | Wife | — | New Jersey |
| 12 | Thomas Jr. Kiernan | 4 | Son | — | New Jersey |
| 13 | Robert Kiernan | 3 | Son | — | New Jersey |
| 14 | Morris Hechman | 43 | Head | Tailor | Russia |
| 15 | Rae Hechman | 41 | Wife | — | Russia |
| 16 | Evelyn Hechman | 20 | Daughter | Book Keeper | New York |
| 17 | Tillie Hechman | 17 | Daughter | — | New Jersey |
| 18 | Salvatore Plumbo | 44 | Head | Meter Reader | Italy |
| 19 | Margaret Plumbo | 39 | Wife | — | Italy |
| 20 | Lawrence Plumbo | 20 | Son | Laborer | New Jersey |
| 21 | Sadie Plumbo | 19 | Daughter | Operator | New Jersey |
| 22 | Frances Plumbo | 18 | Daughter | Operator | New Jersey |
| 23 | Joseph Plumbo | 15 | Son | — | New Jersey |
| 24 | John Plumbo | 13 | Son | — | New Jersey |
| 25 | William Duffy | 48 | Head | Truck Driver | New York |
| 26 | Mary Duffy THIS PERSON | 45 | Wife | — | New Jersey |
| 27 | George Duffy | 24 | Son | Helper | New Jersey |
| 28 | Estelle Kane | 47 | Head | Cleaner | New Jersey |
| 29 | Patrick Kane | 25 | Son | Machinist | New Jersey |
| 30 | Helen Kane | 23 | Daughter | Checker | New Jersey |
| 31 | Margaret Kane | 22 | Daughter | Stenographer | New Jersey |
| 32 | Edith Kane | 19 | Daughter | — | New Jersey |
| 33 | Joseph Kane | 18 | Son | — | New Jersey |
| 34 | Nellie Huch | 25 | Lodger | Nurse | New Jersey |
| 35 | Mike Trzeciakiewicz | 50 | Head | Salesman | Poland |
| 36 | Wanda Trzeciakiewicz | 46 | Wife | — | Poland |
| 37 | Estelle Trzeciakiewicz | 21 | Daughter | Inspector | New Jersey |
| 38 | Alfred Trzeciakiewicz | 20 | Son | — | New Jersey |
| 39 | Mary Trzeciakiewicz | 14 | Daughter | — | New Jersey |
| 40 | Henry Trzeciakiewicz | 12 | Son | — | 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)