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 head (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Kearny |
| 1935 Residence (County) | Hudson |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | G 5 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Kearny |
| Est. Birth Year | ~1884 |
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 |
|---|---|---|---|---|
| Mary Duffy | Daughter | — | 35 | ~1905 |
| Mary Duffy | Head | — | 56 | ~1884 |
| John Duffy | Son | — | 34 | ~1906 |
Census Appearances
1920
Hudson, New …
Spouse, age 37
Hudson, New Jersey · implied b. ~1883 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1908 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Year of Naturalization | 1915 |
| Birthplace (normalized) | ireland |
1930
Hudson, New …
Other, age 47
Hudson, New Jersey · implied b. ~1883 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1908 |
| Age at First Marriage | 30 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Hudson-County, New …
Head, age 56
Hudson-County, New Jersey · implied b. ~1884 — 3 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Kearny |
| 1935 Residence (County) | Hudson |
| Naturalization Status | Naturalized |
| Highest Grade | G 5 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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
Head · 1940 · age 56 · b. ~1884 · 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-t0627-02350-00873)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frederick Kreuse | 9 | Son | — | New Jersey |
| 42 | Herbert Dresse | 41 | Head | Salesman | Germany |
| 43 | Stewart Rand | 30 | Head | Steel Melter | Penn. |
| 44 | Mary Rand | 36 | Wife | — | Penn. |
| 45 | William Liebehen | 56 | Head | Salesman | Denmark |
| 46 | Harry E. Proctor | 40 | Head | — | New York |
| 47 | Joseph Mcfarland | 34 | Head | Compositor | New Jersey |
| 48 | Katherine Mcfarland | 39 | Wife | — | New Jersey |
| 49 | Ann Mcfarland | 19 | Daughter | Clerk | New Jersey |
| 50 | William Mcfarland | 17 | Son | Clerk | New Jersey |
| 51 | Howard Mocenp|Mocenup | 26 | Head | Clerk | New York |
| 52 | Lura Mocenp|Mocenup | 26 | Wife | Typist | New York |
| 53 | Wendell York | 29 | Boarder | Supervisor | Iowa |
| 54 | William Welch | 38 | Head | — | New Jersey |
| 55 | Mary Ella Welch | 39 | Wife | — | Penn. |
| 56 | Julia Ruster | 59 | Head | — | Ireland |
| 57 | Leo De War | 47 | Head | Contractor | New Jersey |
| 58 | Johanna De War | 39 | Wife | — | New Jersey |
| 59 | Jessica De War | 17 | Daughter | — | New Jersey |
| 60 | Dorothy De War | 15 | Daughter | — | New Jersey |
| 61 | William Abrams | 33 | Head | Mach. Operator | New York |
| 62 | Florence Abrams | 35 | Wife | — | New Jersey |
| 63 | William Abrams | 9 | Son | — | New Jersey |
| 64 | Robert Abrams | 5 | Son | — | New Jersey |
| 65 | Robert Abrams | 60 | Father | — | New York |
| 66 | Harry Abrams | 17 | Brother | — | New Jersey |
| 67 | Ralph Abrams | 13 | Brother | — | New Jersey |
| 68 | Mary Duffy THIS PERSON | 56 | Head | — | Ireland |
| 69 | John Duffy | 34 | Son | Hatter | New Jersey |
| 70 | Mary Duffy | 35 | Daughter | Hatter | New Jersey |
| 71 | Elizabeth Winterbottom | 66 | Head | — | Penn. |
| 72 | Marion Weston | 42 | Daughter | Trucking | Penn. |
| 73 | Malcolm Weston | 11 | Son | — | New Jersey |
| 74 | Pontus Nelson | 65 | Head | Carpenter | Sweden |
| 75 | Selma Nelson | 61 | Wife | — | Sweden |
| 76 | Frederick Dillon | 73 | Head | — | New York |
| 77 | Howard Dillon | 44 | Son | — | New York |
| 78 | Jean Dillon | 31 | Daughter | Clerk | New Jersey |
| 79 | Oliver Smith | 22 | Head | Service Man | Ohio |
| 80 | Katherine Smith | 23 | Wife | Secretary | 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)