JL
John Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Leahy across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 8-person household.
Age 63
b. ~1877
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Engineer |
| Industry | Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2500 |
| Highest Grade | 3 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Engineer |
| Township / Ward | New York City |
| Est. Birth Year | ~1877 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Johanna Leahy | Spouse | — | 64 | ~1876 |
| Sullivan Leahy | Other | — | 55 | ~1885 |
| Patrick Leahy | Son | — | 29 | ~1911 |
| Barry Leahy | Other | — | 33 | ~1907 |
| Daniel Leahy | Son | — | 32 | ~1908 |
| John Leahy | Head | — | 63 | ~1877 |
| Sullivan Leahy | Other | — | 28 | ~1912 |
| Josephine Leahy | Daughter | — | 35 | ~1905 |
Census Appearances
1920
Queens, New …
Head, age 46
Queens, New York · implied b. ~1874 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Superintendent |
| Industry | Concrete Factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Kings, New …
Head, age 53
Kings, New York · implied b. ~1877 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1897 |
| Age at First Marriage | 28 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Stat Engineer |
| Industry | Carbonate Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Kings-County, New …
Head, age 63
Kings-County, New York · implied b. ~1877 — 8 household members
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Occupation | Engineer |
| Industry | Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2500 |
| Highest Grade | 3 |
| 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 John Leahy across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
John Leahy
Head · 1940 · age 63 · b. ~1877 · New York
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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
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1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02578-00587)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Lo Bosco | 29 | Head | Shoemaker | New York |
| 2 | Michael Lo Bosco | 51 | Head | Laborer | Italy |
| 3 | Theresa Lo Bosco | 37 | Wife | Laborer | Italy |
| 4 | Philip Lo Bosco | 7 | Son | — | New York |
| 5 | Frank Lo Bosco | 3 | Son | — | New York |
| 6 | Francesco La Corte | 29 | Head | Chauffeur | New York |
| 7 | Florence La Corte | 30 | Wife | — | New York |
| 8 | Rose La Corte | 13 | Daughter | — | New York |
| 9 | Peter La Corte | 11 | Son | — | New York |
| 10 | Anthony Cardinale | 71 | Head | — | Italy |
| 11 | George Cardinale | 26 | Son | Helper | New York |
| 12 | Albert Cardinale | 24 | Son | Helper | New York |
| 13 | Edward Cardinale | 21 | Son | Helper | New York |
| 14 | Daniel Gargano | 36 | Head | Helper | Italy |
| 15 | Margaret Gargano | 31 | Wife | — | New York |
| 16 | Daniel Gargano | 10 | Son | — | New York |
| 17 | Anthony Gargano | 9 | Son | — | New York |
| 18 | Albert Gargano | 7 | Son | — | New York |
| 19 | Fred Gargano | 2 | Son | — | New York |
| 20 | Catherine Gargano | 0 | Daughter | — | New York |
| 21 | Ignazio Brittelli | 52 | Head | Shoemaker | Italy |
| 22 | Saveria Brittelli | 42 | Wife | — | Italy |
| 23 | Pasquale Brittelli | 26 | Son | Handyman | New York |
| 24 | Frank Rossi | 59 | Head | Clerk | New York |
| 25 | Olga Rossi | 49 | Wife | — | New York |
| 26 | John Rossi | 23 | Son | Bookkeeper | New York |
| 27 | Robert Rossi | 16 | Son | Clerk | New York |
| 28 | Martha Rossi | 20 | Daughter | Clerk | New York |
| 29 | Andrew Mc Coy | 59 | Head | Engineer | New York |
| 30 | Noomey Mc Coy | 54 | Sister | — | New York |
| 31 | Andrew Mc Coy | 24 | Nephew | Doorman | New York |
| 32 | Edward Mc Coy | 23 | Nephew | Engineer | New York |
| 33 | John Leahy THIS PERSON | 63 | Head | Engineer | Ireland |
| 34 | Johanna Leahy | 64 | Wife | — | Ireland |
| 35 | Daniel Leahy | 32 | Son | Chauffeur | New York |
| 36 | Patrick Leahy | 29 | Son | Bartender | New York |
| 37 | Josephine Leahy | 35 | Daughter | Floor Girl | New York |
| 38 | Barry James Leahy | 33 | Nephew | Machinist | Ireland |
| 39 | Sullivan James Leahy | 28 | Nephew | Helper | Ireland |
| 40 | Sullivan Catherine Leahy | 55 | Sister in law | — | Ireland |
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)