MD
Mary Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Hudson, New Jersey
Our Model Tree links this Mary Duffy across the 1930 and 1940 US Censuses in Hudson, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 12-person household.
Age 4
b. ~1926
Female
Daughter
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Hudson, New Jersey |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Additional Details | |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1926 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Duffy | Daughter | — | 12 | ~1918 |
| Mary Duffy | Daughter | — | 4 | ~1926 |
| James Duffy | Head | — | 45 | ~1885 |
| Robert Duffy | Son | — | 6 | ~1924 |
| William Duffy | Son | — | 14 | ~1916 |
| John Duffy | Son | — | 16 | ~1914 |
| Francis Duffy | Son | — | 8 | ~1922 |
| Joseph Duffy | Son | — | 10 | ~1920 |
| James Duffy | Son | — | 18 | ~1912 |
| Thomas Duffy | Son | — | ~1930 | |
| Leo Duffy | Son | — | 2 | ~1928 |
| Mary Duffy | Spouse | — | 42 | ~1888 |
Census Appearances
1930
Hudson, New …
Daughter, age 4
Hudson, New Jersey · implied b. ~1926 — 12 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Daughter, age 14
Hudson-County, New Jersey · implied b. ~1926 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffey |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Hours Worked | 0 |
| Highest Grade | 7 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duffy
Daughter · 1930 · age 4 · b. ~1926 · New Jersey
★ You are viewing this record
Sibling
Leo Duffy
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Duffy
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Duffy
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duffy
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Duffy
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Duffy
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Duffy
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Duffy
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duffy
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Hudson, New Jersey
Open full size
1930 US Federal Census — Hudson, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1356:0995)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Lafferty | 38 | Head | Laborer | New Jersey |
| 52 | Garnet Lafferty | 32 | Wife | — | New Jersey |
| 53 | John Jr Lafferty | 14 | Son | — | New Jersey |
| 54 | Joseph Lafferty | 12 | Son | — | New Jersey |
| 55 | Richard Lafferty | 10 | Son | — | New Jersey |
| 56 | Paul Lafferty | 8 | Son | — | New Jersey |
| 57 | Robert Lafferty | 6 | Son | — | New Jersey |
| 58 | Mary Lafferty | 4 | Daughter | — | New Jersey |
| 59 | Francis Lafferty | 2 | Son | — | New Jersey |
| 60 | Luke Johnston | 40 | Head | Laborer | New Jersey |
| 61 | Florence Johnston | 38 | Wife | — | New Jersey |
| 62 | Luke Jr Johnston | 14 | Son | — | New Jersey |
| 63 | John Johnston | 12 | Son | — | New Jersey |
| 64 | Leo Johnston | 10 | Son | — | New Jersey |
| 65 | Florence Johnston | 8 | Daughter | — | New Jersey |
| 66 | William Johnston | 6 | Son | — | New Jersey |
| 67 | Catherine Johnston | 4 | Daughter | — | New Jersey |
| 68 | James Johnston | 2 | Son | — | New Jersey |
| 69 | Thomas Johnston | 0 | Son | — | New Jersey |
| 70 | James Duffy | 45 | Head | Laborer | New Jersey |
| 71 | Mary Duffy | 42 | Wife | — | New Jersey |
| 72 | James Jr Duffy | 18 | Son | Laborer | New Jersey |
| 73 | John Duffy | 16 | Son | — | New Jersey |
| 74 | William Duffy | 14 | Son | — | New Jersey |
| 75 | Catherine Duffy | 12 | Daughter | — | New Jersey |
| 76 | Joseph Duffy | 10 | Son | — | New Jersey |
| 77 | Francis Duffy | 8 | Son | — | New Jersey |
| 78 | Robert Duffy | 6 | Son | — | New Jersey |
| 79 | Mary Duffy THIS PERSON | 4 | Daughter | — | New Jersey |
| 80 | Leo Duffy | 2 | Son | — | New Jersey |
| 81 | Thomas Duffy | 0 | Son | — | New Jersey |
| 82 | John Luffield | 42 | Head | Laborer | New Jersey |
| 83 | Mary Luffield | 40 | Wife | — | New Jersey |
| 84 | John Jr Luffield | 18 | Son | Laborer | New Jersey |
| 85 | Margaret Luffield | 16 | Daughter | — | New Jersey |
| 86 | Arthur Williams | 55 | Head | Laborer | New Jersey |
| 87 | Mabel Williams | 52 | Wife | — | New Jersey |
| 88 | Frank Sylvester | 31 | Son-in-law | Laborer | New Jersey |
| 89 | Evelyn Sylvester | 28 | Daughter | — | New Jersey |
| 90 | James Cassidy | 40 | Head | Laborer | New Jersey |
| 91 | Alice Cassidy | 38 | Wife | — | New Jersey |
| 92 | James Jr Cassidy | 14 | Son | — | New Jersey |
| 93 | John Cassidy | 12 | Son | — | New Jersey |
| 94 | Leo Cassidy | 10 | Son | — | New Jersey |
| 95 | Florence Cassidy | 8 | Daughter | — | New Jersey |
| 96 | William Cassidy | 6 | Son | — | New Jersey |
| 97 | Catherine Cassidy | 4 | Daughter | — | New Jersey |
| 98 | James Cassidy | 2 | Son | — | New Jersey |
| 99 | Thomas Cassidy | 0 | Son | — | New Jersey |
| 100 | John Flanagan | 38 | Head | Laborer | New Jersey |
Related Census Records
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)