JD
James Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Passaic-County, New Jersey
Our Model Tree links this James Duffy across the 1930 and 1940 US Censuses in Passaic-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1910), then head of a 11-person household.
Age 30
b. ~1910
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Passaic-County, New Jersey |
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Hawthorne |
| 1935 Residence (County) | Passaic |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Stock Broker |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1040 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Bookkeeper |
| Township / Ward | Hawthorne |
| Est. Birth Year | ~1910 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Margaret Duffy | Daughter | — | 39 | ~1901 |
| Ruth Duffy | Daughter | — | 40 | ~1900 |
| Eleanor Duffy | Daughter | — | 17 | ~1923 |
| Frank Duffy | Head | — | 74 | ~1866 |
| Bryce Duffy | Son | — | 23 | ~1917 |
| Joseph Duffy | Son | — | 21 | ~1919 |
| Eugene Duffy | Son | — | 19 | ~1921 |
| Richard Duffy | Son | — | 34 | ~1906 |
| James Duffy | Son | — | 30 | ~1910 |
| Charles Duffy | Son | — | 26 | ~1914 |
| Delia Duffy | Spouse | — | 62 | ~1878 |
Census Appearances
1930
Union, New …
Son, age 20
Union, New Jersey · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | truck driver |
| Industry | stores |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Passaic-County, New …
Son, age 30
Passaic-County, New Jersey · implied b. ~1910 — 11 household members
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Hawthorne |
| 1935 Residence (County) | Passaic |
| Occupation | Bookkeeper |
| Industry | Stock Broker |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1040 |
| Highest Grade | 8 |
| 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 James Duffy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Duffy
Son · 1940 · age 30 · b. ~1910 · New Jersey
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Sibling
Margaret Duffy
Sibling · 1940 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Duffy
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bryce Duffy
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Duffy
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duffy
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Duffy
Sibling · 1940 · age 40
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Duffy
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Duffy
Sibling · 1940 · age 19
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 — Passaic-County, New Jersey
Open full size
1940 US Federal Census — Passaic-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02376-00892)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Catherine Aughey | 9 | Daughter | — | New Jersey |
| 42 | George Link | 65 | Head | Legislative | New York |
| 43 | Minnie Link | 45 | Wife | — | New Jersey |
| 44 | Elaine Link | 14 | Daughter | — | New Jersey |
| 45 | Frank Duffy | 74 | Head | — | Ireland |
| 46 | Delia Duffy | 62 | Wife | — | Ireland |
| 47 | Ruth Duffy | 40 | Daughter | — | New Jersey |
| 48 | Margaret Duffy | 39 | Daughter | Caterer | New Jersey |
| 49 | Richard Duffy | 34 | Son | Distributor | New Jersey |
| 50 | James Duffy THIS PERSON | 30 | Son | Bookkeeper | New Jersey |
| 51 | Charles Duffy | 26 | Son | Clerk | New Jersey |
| 52 | Bryce Duffy | 23 | Son | Clerk | New Jersey |
| 53 | Joseph Duffy | 21 | Son | Clerk | New Jersey |
| 54 | Eugene Duffy | 19 | Son | Clerk | New Jersey |
| 55 | Eleanor Duffy | 17 | Daughter | — | New Jersey |
| 56 | Anna Schaffer | 61 | Head | — | New Jersey |
| 57 | William Reider | 68 | Head | — | Holland |
| 58 | Hulda Reider | 65 | Wife | — | Holland |
| 59 | Florence Reider | 30 | Daughter | Saleslady | New Jersey |
| 60 | Jacob Reider | 28 | Son | Clerk | New Jersey |
| 61 | James Reider | 24 | Son | Bottler | New Jersey |
| 62 | John Bunn | 34 | Head | Clerk | New Jersey |
| 63 | Elizabeth Bunn | 33 | Wife | — | New Jersey |
| 64 | John Bunn | 14 | Son | — | New Jersey |
| 65 | Ralph Bunn | 12 | Son | — | New Jersey |
| 66 | Donald Bunn | 11 | Son | — | New Jersey |
| 67 | Jesse Davies | 31 | Head | Telephone Installer | New Jersey |
| 68 | Lila Davies | 29 | Wife | — | New Jersey |
| 69 | Lila Davies | 5 | Daughter | — | New Jersey |
| 70 | Joan Davies | 3 | Daughter | — | New Jersey |
| 71 | William Davies | 0 | Son | — | New Jersey |
| 72 | Joseph Rybert | 39 | Head | Installer | New Jersey |
| 73 | Mary Rybert | 27 | Wife | — | New Jersey |
| 74 | Joan Rybert | 3 | Daughter | — | New Jersey |
| 75 | Robert Rybert | 0 | Son | — | New Jersey |
| 76 | Russell Tiger | 44 | Head | Plumber | New York |
| 77 | Aida Tiger | 43 | Wife | — | New York |
| 78 | Eleanor Tiger | 21 | Daughter | Secretary | New York |
| 79 | Rita Tiger | 20 | Daughter | Apprentice | New Jersey |
| 80 | Russell Jr. Tiger | 18 | Son | — | New Jersey |
Related Census Records
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)