MD
Mary Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Union, New Jersey
Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Union, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 7-person household.
Age 55
b. ~1875
Female
Spouse
Born: Ireland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Union, New Jersey |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Hillside |
| Est. Birth Year | ~1875 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Duffy | Daughter | — | 22 | ~1908 |
| Thomas Duffy | Head | — | 58 | ~1872 |
| James Duffy | Son | — | 20 | ~1910 |
| Thomas Duffy | Son | — | 30 | ~1900 |
| Martin Duffy | Son | — | 25 | ~1905 |
| John Duffy | Son | — | 28 | ~1902 |
| Mary Duffy | Spouse | — | 55 | ~1875 |
Census Appearances
1920
Hudson, New …
Spouse, age 45
Hudson, New Jersey · implied b. ~1875 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1891 |
| 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 |
| Birthplace (normalized) | ireland |
1930
Union, New …
Spouse, age 55
Union, New Jersey · implied b. ~1875 — 7 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Essex-County, New …
Spouse, age 65
Essex-County, New Jersey · implied b. ~1875 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Newark |
| 1935 Residence (County) | Essex |
| Naturalization Status | Alien |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same House |
| 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 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Duffy
Spouse · 1930 · age 55 · b. ~1875 · New Jersey
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Union, New Jersey
Open full size
1930 US Federal Census — Union, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1387:0848)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Andrew Zarayda | 19 | son | — | New Jersey |
| 52 | Henrietta Zarayda | 19 | daughter | — | New Jersey |
| 53 | John Zarayda | 9 | son | — | New Jersey |
| 54 | Charles Bach | 72 | head | Salesman | Germany |
| 55 | Margaret Bach | 72 | wife | None | Florida |
| 56 | Charles Bach | 40 | son | None | New York |
| 57 | William J Denni | 57 | head | None | Pennsylvania |
| 58 | Emma F Denni | 56 | wife | None | Maryland |
| 59 | William A Denni | 27 | son | None | Maryland |
| 60 | Emma Denni | 17 | daughter | None | Maryland |
| 61 | George H Geyer | 54 | head | Inspector | Ohio |
| 62 | Katherine Geyer | 48 | wife | None | New Jersey |
| 63 | Jessie Geyer | 21 | daughter | None | New Jersey |
| 64 | Louise Geyer | 18 | daughter | None | New Jersey |
| 65 | Christine Geyer | 16 | daughter | None | New Jersey |
| 66 | Robert Prye | 27 | head | Bookkeeper | New Jersey |
| 67 | Olga V Prye | 23 | wife | None | New Jersey |
| 68 | Marilyn A Prye | 1 | daughter | None | New Jersey |
| 69 | Russell Gimbel | 23 | head | Tool Maker | Pennsylvania |
| 70 | Lillian Gimbel | 21 | wife | None | Indiana |
| 71 | Russell Jr Gimbel | 3 | son | None | Pennsylvania |
| 72 | Mary Hassell | 43 | head | None | New Jersey |
| 73 | Harry Hassell | 23 | son | Waiter | New Jersey |
| 74 | Mildred Hassell | 21 | daughter | Factory Worker | New Jersey |
| 75 | Aaron Hassell | 19 | son | Operator Elevator | New Jersey |
| 76 | Margaret Mckee | 50 | head | None | New York |
| 77 | Thomas Duffy | 58 | head | Moulder | Ireland |
| 78 | Mary Duffy THIS PERSON | 55 | wife | None | Ireland |
| 79 | Thomas Duffy | 30 | son | Policeman | New Jersey |
| 80 | John Duffy | 28 | son | Fireman | New Jersey |
| 81 | Martin Duffy | 25 | son | Iron Worker | New Jersey |
| 82 | Catherine Duffy | 22 | daughter | Stenographer | New Jersey |
| 83 | James Duffy | 20 | son | Truck Driver | New Jersey |
| 84 | John H Donnelly | 31 | head | Estimator | New Jersey |
| 85 | Ella Donnelly | 29 | wife | None | Austria |
| 86 | Harold Donnelly | 10 | son | None | New Jersey |
| 87 | Alice Donnelly | 4 | daughter | None | New Jersey |
| 88 | Anthony Hasselman | 40 | head | Watchman | Germany |
| 89 | Mary Hasselman | 36 | wife | Factory Worker | Austria |
| 90 | Albert Hasselman | 17 | son | None | New Jersey |
| 91 | Peter Matera | 36 | head | Sail Maker | Italy |
| 92 | Blanche Matera | 24 | wife | None | New Jersey |
| 93 | Peter Jr Matera | 2 | son | None | New Jersey |
| 94 | John Matera | 0 | son | None | New Jersey |
| 95 | Isabella Matera | 75 | mother | None | Potenza Italy |
| 96 | Charles Ilg | 45 | head | Machinist | New York |
| 97 | Mary Ilg | 38 | wife | None | New York |
| 98 | Charles Jr Ilg | 14 | son | None | New Jersey |
| 99 | John Mehefity | 55 | head | Upholstering | New Jersey |
| 100 | Catherine Mehefity | 48 | wife | None | New Jersey |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)