JD
John Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Duffy across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed), with identified parents Kate — first a head (b.~1895), then head of a 6-person household.
Age 45
b. ~1895
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Tinsmith |
| Industry | Railway Co |
| Class of Worker | PW |
| Income (1939) | 1872 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Tinsmith |
| 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 John | Age | Birth yr |
|---|---|---|---|---|
| Ann Duffy | Daughter | — | 17 | ~1923 |
| John Duffy | Head | — | 45 | ~1895 |
| John Duffy | Son | — | 15 | ~1925 |
| Martin Duffy | Son | — | 19 | ~1921 |
| Malachy Duffy | Son | — | 8 | ~1932 |
| Catherine Duffy | Spouse | — | 45 | ~1895 |
Census Appearances
1920
New York, …
Son, age 24
New York, New York · implied b. ~1896 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1914 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Clerk |
| Industry | Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Kings, New …
Head, age 34
Kings, New York · implied b. ~1896 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1915 |
| Age at First Marriage | 27 |
| Father's Birthplace | Free State Ireland |
| Mother's Birthplace | Free State Ireland |
| Occupation | Shipping Clerk |
| Industry | Importing Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 57.50 |
| Radio Set | R |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Kings-County, New …
Head, age 45
Kings-County, New York · implied b. ~1895 — 6 household members
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Occupation | Tinsmith |
| Industry | Railway Co |
| Class of Worker | PW |
| Income (1939) | 1872 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 John Duffy across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: mother Kate Duffy (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Kate Duffy
b. ~1860
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Duffy
Head · 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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02578-00018)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Abie Cunningham | 29 | Lodger | Waitress | Ireland |
| 42 | John Duffy THIS PERSON | 45 | Head | Tinsmith | Scotland |
| 43 | Catherine Duffy | 45 | Wife | — | New York |
| 44 | Martin Duffy | 19 | Son | New Worker | New York |
| 45 | Ann Duffy | 17 | Daughter | — | New York |
| 46 | John Jr Duffy | 15 | Son | — | New York |
| 47 | Malachy Duffy | 8 | Son | — | New York |
| 48 | Joseph Colgan | 52 | Head | Attendant Helper | New York |
| 49 | Mary Colgan | 47 | Wife | — | Ireland |
| 50 | William Colgan | 25 | Son | Clerk | New York |
| 51 | James Colgan | 21 | Son | Clerical Worker | New York |
| 52 | Michael Colgan | 17 | Son | New Worker | New York |
| 53 | Catherine Colgan | 13 | Daughter | — | New York |
| 54 | Margaret Colgan | 10 | Daughter | — | New York |
| 55 | Gerald Van Wart | 29 | Head | Foreman | New York |
| 56 | Lanie Van Wart | 31 | Wife | — | Wisconsin |
| 57 | Dorothy Ponnard | 12 | Daughter | — | New York |
| 58 | Anna Tierney | 21 | Head | — | New York |
| 59 | Charles Tierney | 15 | Son | — | New York |
| 60 | Wilbur Etheridge | 34 | Head | Laborer | New York |
| 61 | Catherine Etheridge | 32 | Wife | — | New York |
| 62 | Frank Starr | 63 | Head | Laborer | Ireland |
| 63 | Mary Starr | 60 | Wife | — | New York |
| 64 | Jane Wallace | 58 | Head | — | Scotland |
| 65 | Gerald Mullan | 38 | Head | Timekeeper | Ireland |
| 66 | Agnes Mullan | 29 | Wife | Nurse | Ireland |
| 67 | Francis Collan | 33 | Head | Rigger | Ireland |
| 68 | Nora Collan | 32 | Wife | — | Ireland |
| 69 | Francis Collan | 7 | Son | — | New York |
| 70 | Rose Collan | 5 | Daughter | — | New York |
| 71 | Margaret Collan | 4 | Daughter | — | New York |
| 72 | Thomas W. Simmons | 37 | Head | Steward | New Jersey |
| 73 | Esther Simmons | 40 | Wife | — | Russia |
| 74 | Patricia Simmons | 7 | Daughter | — | New York |
| 75 | Ellen Simmons | 5 | Daughter | — | New York |
| 76 | William Olson | 30 | Head | Stone Cutter | New York |
| 77 | Margaret Olson | 25 | Wife | — | New York |
| 78 | Judith Olson | 2 | Daughter | — | New York |
| 79 | Barretti Olson | 1 | Son | — | New York |
| 80 | Fred Dacosta | 62 | Head | — | New York |
Pedigree Summary
John
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)