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James Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · New-York-County, New York
Our Model Tree links this James Mcmahon across the 1930 and 1940 US Censuses in New-York-County, New York (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 8-person household.
Age 10
b. ~1930
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | New-York-County, New York |
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York |
| 1935 Residence (County) | New York |
| Additional Details | |
| Industry | 0 |
| Highest Grade | S 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Township / Ward | New York |
| Est. Birth Year | ~1930 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcmahon | Daughter | — | 16 | ~1924 |
| Ann Mcmahon | Daughter | — | 19 | ~1921 |
| Catherine Mcmahon | Daughter | — | 14 | ~1926 |
| Michael Mcmahon | Head | — | 48 | ~1892 |
| Martin Mcmahon | Son | — | 15 | ~1925 |
| Michael Mcmahon | Son | — | 20 | ~1920 |
| James Mcmahon | Son | — | 10 | ~1930 |
| Mary Mcmahon | Spouse | — | 50 | ~1890 |
Census Appearances
1930
New York, …
Son, age
New York, New York · implied b. ~1930 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mc Mahan |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
New-York-County, New …
Son, age 10
New-York-County, New York · implied b. ~1930 — 8 household members
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York |
| 1935 Residence (County) | New York |
| Industry | 0 |
| Highest Grade | S 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mcmahon
Son · 1940 · age 10 · b. ~1930 · New York
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Sibling
Ann Mcmahon
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Mcmahon
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Mcmahon
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcmahon
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mcmahon
Sibling · 1940 · age 14
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 — New-York-County, New York
Open full size
1940 US Federal Census — New-York-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02632-00763)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rose Aversa | 10 | Daughter | — | New York |
| 42 | Martin Aversa | 8 | Son | — | New York |
| 43 | Emila Di Jordan | 56 | Lodger | — | Italy |
| 44 | Joseph Di Jordan | 33 | Lodger | Handyman | New York |
| 45 | Elizabeth Graham | 49 | Head | Cleaner | Scotland |
| 46 | John Graham | 20 | Son | Messenger | Pennsylvania |
| 47 | Margaret Graham | 19 | Daughter | Packer | Pennsylvania |
| 48 | Michael Graham | 15 | Son | — | Pennsylvania |
| 49 | William Graham | 5 | Son | — | Pennsylvania |
| 50 | Salvatore De George | 34 | Head | Barber | New York |
| 51 | Grace De George | 29 | Wife | — | New York |
| 52 | Dominick De George | 8 | Son | — | New York |
| 53 | Francis De George | 5 | Son | — | New York |
| 54 | Carila De George | 5 | Daughter | — | New York |
| 55 | Joseph De George | 0 | Son | — | New York |
| 56 | Angelo Capuano | 54 | Head | — | Italy |
| 57 | Rose Capuano | 46 | Wife | — | Illinois |
| 58 | Mary Capuano | 26 | Daughter | Registered Nurse | New York |
| 59 | Frank Capuano | 23 | Son | Printer | New York |
| 60 | John Mcclarnon | 32 | Head | Garageman | New York |
| 61 | Alice Mcclarnon | 28 | Wife | — | New York |
| 62 | Catherine Mcclarnon | 9 | Daughter | — | New York |
| 63 | Patricia Mcclarnon | 2 | Daughter | — | New York |
| 64 | Salvatore Petragalia | 55 | Head | — | Italy |
| 65 | Pauline Petragalia | 58 | Wife | — | Italy |
| 66 | Charles Petragalia | 28 | Son | Salesman-Grocery | New York |
| 67 | Paul Petragalia | 22 | Son | Shoes-Shoe Town | New York |
| 68 | Frank Smick | 43 | Head | Chauffeur | New York |
| 69 | Theresa Smick | 36 | Wife | — | New York |
| 70 | Dorothy Smick | 11 | Daughter | — | New York |
| 71 | Elizabeth Smick | 10 | Daughter | — | New York |
| 72 | Michael Mcmahon | 48 | Head | Laborer | Eire |
| 73 | Mary Mcmahon | 50 | Wife | — | Eire |
| 74 | Michael Mcmahon | 20 | Son | Clerk | New York |
| 75 | Ann Mcmahon | 19 | Daughter | Clerk Of Office | New York |
| 76 | Mary Mcmahon | 16 | Daughter | — | New York |
| 77 | Martin Mcmahon | 15 | Son | — | New York |
| 78 | Catherine Mcmahon | 14 | Daughter | — | New York |
| 79 | James Mcmahon THIS PERSON | 10 | Son | — | New York |
| 80 | Josephine Minall | 64 | Head | — | Eire |
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)