WD
William Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this William Duffy across the 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 7-person household.
Age 17
b. ~1923
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | HOBOKEN |
| 1935 Residence (County) | HUDSON |
| Additional Details | |
| Highest Grade | Hs 3 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Hoboken |
| Est. Birth Year | ~1923 |
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 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Robert Duffy | Son | — | 36 | ~1904 |
| William Duffy | Son | — | 17 | ~1923 |
| Veronica Blaszezak | Other | — | 19 | ~1921 |
| Veronica Duffy | Daughter | — | 24 | ~1916 |
| William Duffy | Head | — | 61 | ~1879 |
| J Duffy | Son | — | 14 | ~1926 |
| Rose Duffy | Spouse | — | 60 | ~1880 |
Census Appearances
1930
Hudson, New …
Son, age 7
Hudson, New Jersey · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | New Jersey |
| Can Read/Write | No |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Son, age 17
Hudson-County, New Jersey · implied b. ~1923 — 7 household members
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | HOBOKEN |
| 1935 Residence (County) | HUDSON |
| Highest Grade | Hs 3 |
| 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 William Duffy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Duffy
Son · 1940 · age 17 · b. ~1923 · New Jersey
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Sibling
J Duffy
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Veronica Duffy
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Duffy
Sibling · 1940 · age 36
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
1940 US Federal Census — Hudson-County, New Jersey
Open full size
1940 US Federal Census — Hudson-County, New Jersey
Page Contents
24 people indexed on this census page (nara:1940:m-t0627-02349-00877)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna Rinker | 68 | Mother in law | — | Germany |
| 42 | Helen Parrain | 34 | Lodger | Nurse | New York |
| 43 | Ada Smith | 45 | Lodger | Laundress | Holland |
| 44 | Madeline Freeman | 27 | Head | Clerk | New York |
| 45 | Elizabeth Burnette | 68 | Head | Public School | Newfoundland |
| 46 | Ernest Mayer | 63 | Head | Public School | New Jersey |
| 47 | Mother Gessner | None | F | — | — |
| 48 | Frank Gessner | 31 | Cousin | Junior Clerk | New York |
| 49 | Elmer Winston | 49 | Head | Clerk | New York |
| 50 | Emma Winston | 70 | Aunt | — | New York |
| 51 | Eleanor O'Grady | 51 | Head | Public School | New Jersey |
| 52 | Salvatore Palazzo | 38 | Lodger | Ovenman | Italy |
| 53 | Elizabeth Hing | 46 | Head | Public School | New Jersey |
| 54 | Robert E. Gordon | 27 | Head | Physician | New Jersey |
| 55 | John Maybaum | 31 | Head | Seaman | Germany |
| 56 | Richard Maybaum | 25 | Lodger | Seaman | New York |
| 57 | Andrew Olsen | 63 | Head | Barge Capt | Norway |
| 58 | William Duffy | 61 | Head | President | Eire |
| 59 | Rose Duffy | 60 | Wife | — | New Jersey |
| 60 | Robert Duffy | 36 | Son | Contract Man | New Jersey |
| 61 | William Duffy THIS PERSON | 17 | Son | — | New Jersey |
| 62 | J. O'Neill Duffy | 14 | Son | — | New Jersey |
| 63 | Veronica Duffy | 24 | Daughter | — | New Jersey |
| 64 | Veronica Blaszezak | 19 | Servant | Domestic | 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)