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James Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a head (b.~1873), then head of a 6-person household.
Age 67
b. ~1873
Male
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 67 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | New York City |
| Est. Birth Year | ~1873 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Marie Osborne | Daughter | — | 20 | ~1920 |
| James Mcmahon | Head | — | 67 | ~1873 |
| Frank James | Other | — | 21 | ~1919 |
| James Mcmahon | Son | — | 31 | ~1909 |
| John Osborne | Son | — | 22 | ~1918 |
| John Mcmahon | Son | — | 28 | ~1912 |
Census Appearances
1920
Westchester, New …
Head, age 47
Westchester, New York · implied b. ~1873 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Chauffeur |
| Industry | Private Family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Bronx, New …
Head, age 58
Bronx, New York · implied b. ~1872 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1875 |
| Age at First Marriage | 35 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Chauffeur |
| Industry | Cooper Ind. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 40 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Kings-County, New …
Head, age 67
Kings-County, New York · implied b. ~1873 — 6 household members
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 67 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| 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 James Mcmahon across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
James Mcmahon
Head · 1940 · age 67 · b. ~1873 · 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
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02568-00613)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leonard Elliott | 9 | Son | — | New York |
| 2 | Lucy Beckwith | 40 | Head | — | Virginia |
| 3 | Viola Beckwith | 27 | Head | — | New York |
| 4 | Gertrude Beckwith | 26 | Wife | — | North Carolina |
| 5 | James Mcmahon THIS PERSON | 67 | Head | — | Ireland |
| 6 | James Mcmahon | 31 | Son | Auto Mechanic | New York |
| 7 | John Mcmahon | 28 | Son | Painter | New York |
| 8 | John Osborne | 22 | Son | Laborer | New York |
| 9 | Marie Osborne | 20 | Daughter | — | New York |
| 10 | Frank James | 21 | Boarder | — | New York |
| 11 | Edward Chojnacki | 24 | Head | Painter | New York |
| 12 | Helen Chojnacki | 25 | Wife | Paper Box | New York |
| 13 | Evelyn Chojnacki | 16 | Sister | Wrapper | Pennsylvania |
| 14 | Rocco Cetta | 34 | Head | Bakery Shop | Italy |
| 15 | Mary Cetta | 31 | Wife | — | Italy |
| 16 | Angelo Cetta | 10 | Son | — | Italy |
| 17 | Pasquale Cetta | 6 | Son | — | New York |
| 18 | Anthony Cetta | 5 | Son | — | New York |
| 19 | Angelina Cetta | 1 | Daughter | — | New York |
| 20 | Vito Vitale | 52 | Head | Ice Coal Dealer | Italy |
| 21 | Jennie Vitale | 47 | Wife | — | Italy |
| 22 | Mary Vitale | 21 | Daughter | Olive Packer | New York |
| 23 | Philip Vitale | 19 | Son | Ice Coal Dealer | New York |
| 24 | Dominick Vitale | 17 | Son | Ice Coal Dealer | New York |
| 25 | Marie Vitale | 16 | Daughter | New Worker | New York |
| 26 | Jeanette Vitale | 12 | Daughter | — | New York |
| 27 | Frances Vitale | 9 | Daughter | — | New York |
| 28 | Adele Vitale | 6 | Daughter | — | New York |
| 29 | Line Extra | None | — | — | — |
| 30 | Wladyslaw Trojan | 55 | Head | Chef | Poland |
| 31 | Agatha Trojan | 45 | Wife | — | Austria |
| 32 | Mary Trojan | 22 | Daughter | Waitress | New York |
| 33 | Rose Trojan | 20 | Daughter | Soda Clerk | New York |
| 34 | Genevieve Lisman | 14 | Niece | — | New York |
| 35 | Josephine Fuchs | 42 | Head | Clerk | New York |
| 36 | Joseph Keegan | 41 | Head | Ship Clerk | New York |
| 37 | Helen Keegan | 40 | Wife | — | New York |
| 38 | Bernard Keegan | 9 | Son | — | New York |
| 39 | Joseph Keegan | 1 | Son | — | New York |
| 40 | Francis Mahar | 52 | Head | Clerk | New York |
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)