MD
Mary Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bronx-County, New York
Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed) — first a spouse (b.~1895), then head of a 6-person household.
Age 45
b. ~1895
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bronx-County, New York |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | New York 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sadie Duffy | Daughter | — | 18 | ~1922 |
| Rita Duffy | Daughter | — | 12 | ~1928 |
| Margaret Duffy | Daughter | — | 16 | ~1924 |
| James Duffy | Head | — | 50 | ~1890 |
| William Duffy | Son | — | 15 | ~1925 |
| Mary Duffy | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Kings, New …
Spouse, age 24
Kings, New York · implied b. ~1896 — 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 | 24 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1911 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Kings, New …
Spouse, age 35
Kings, New York · implied b. ~1895 — 9 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 | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1914 |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Bronx-County, New …
Spouse, age 45
Bronx-County, New York · implied b. ~1895 — 6 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 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.
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This person
Anchor record
Mary Duffy
Spouse · 1940 · age 45 · b. ~1895 · New York
★ 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 — Bronx-County, New York
Open full size
1940 US Federal Census — Bronx-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02497-00819)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rose Roth | 75 | — | Needlework | New York |
| 2 | Patrick Willels | Willels | 38 | Head | Mason | Ireland |
| 3 | Margaret Willels | Willels | 38 | Wife | — | New York |
| 4 | Gerald Willels | Willels | 8 | Son | — | New York |
| 5 | Patricia Willels | Willels | 6 | Daughter | — | New York |
| 6 | Eileen Willels | Willels | 4 | Daughter | — | New York |
| 7 | Frank Heilman | 56 | Head | Butcher | New York |
| 8 | Matilda Heilman | 53 | Wife | Cook | Germany |
| 9 | Carolyn Heilman | 27 | Daughter | — | New York |
| 10 | Helen Heilman | 17 | Daughter | — | New York |
| 11 | Bert Krakauer | 17 | Lodger | Delivery Boy | Germany |
| 12 | Michael Mitchell | 32 | Head | Motorman | Ireland |
| 13 | Mary Mitchell | 32 | Wife | — | Ireland |
| 14 | John Mitchell | 9 | Son | — | New York |
| 15 | Joseph Mitchell | 8 | Son | — | New York |
| 16 | Mary Mitchell | 5 | Daughter | — | New York |
| 17 | Margaret Mitchell | 3 | Daughter | — | New York |
| 18 | James Mitchell | 1 | Son | — | New York |
| 19 | James Duffy | 50 | Head | Ironworker | Ireland |
| 20 | Mary Duffy THIS PERSON | 45 | Wife | — | Ireland |
| 21 | Sadie Duffy | 18 | Daughter | Waitress | New York |
| 22 | Margaret Duffy | 16 | Daughter | — | New York |
| 23 | William Duffy | 15 | Son | — | New York |
| 24 | Rita Duffy | 12 | Daughter | — | New York |
| 25 | Thomas Cavanaugh | 37 | Head | Motorman | New York |
| 26 | Helen Cavanaugh | 31 | Wife | — | Ireland |
| 27 | Thomas Cavanaugh | 12 | Son | — | New York |
| 28 | Helen Cavanaugh | 10 | Daughter | — | New York |
| 29 | Margaret Cavanaugh | 6 | Daughter | — | New York |
| 30 | Theodore France | 35 | Head | Taster On | Austria |
| 31 | Stanley France | 15 | Son | — | New York |
| 32 | Patrick Mcgee | 36 | Head | Superintendent | Ireland |
| 33 | Mary Mcgee | 31 | Wife | — | Ireland |
| 34 | Maude Mcgee | 11 | Daughter | — | New York |
| 35 | Elsie Mcgee | 10 | Daughter | — | New York |
| 36 | Patricia Mcgee | 8 | Daughter | — | New York |
| 37 | Kathleen Mcgee | 7 | Daughter | — | New York |
| 38 | Charles Mcgee | 5 | Son | — | New York |
| 39 | James Mcgee | 3 | Son | — | New York |
| 40 | Martin Higgins | 34 | Head | Salesman | New York |
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)