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James Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Bronx-County, New York
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1910), then head of a 2-person household.
Age 30
b. ~1910
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Bronx-County, New York |
| Surname | MCMAHON |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | N.Y.C. |
| 1935 Residence (County) | Bronx |
| Additional Details | |
| Occupation | clerk |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Clerk |
| Township / Ward | Nyc |
| 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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcmahon | Head | — | 66 | ~1874 |
| James Mcmahon | Son | — | 30 | ~1910 |
Census Appearances
1920
Bronx, New …
Son, age 10
Bronx, New York · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Bronx, New …
Son, age 20
Bronx, New York · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Bronx-County, New …
Son, age 30
Bronx-County, New York · implied b. ~1910 — 2 household members
| Surname | MCMAHON |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | N.Y.C. |
| 1935 Residence (County) | Bronx |
| Occupation | clerk |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | H 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mcmahon (~0.92 confidence) and father James Mcmahon (~0.92 confidence) and mother Mary Mcmahon (~0.92 confidence) and mother Henrietta Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mcmahon
b. ~1869
Source father
● Household
· direct · ~0.92
Father
James Mcmahon
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Mary Mcmahon
b. ~1874
Source mother
● Household
· direct · ~0.92
Mother
Henrietta Mcmahon
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mcmahon
Son · 1940 · age 30 · b. ~1910 · 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 — Bronx-County, New York
Open full size
1940 US Federal Census — Bronx-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02490-00812)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Andrew Bergmann | 65 | Head | Milk Salesman | Russia |
| 42 | Magdalena Bergmann | 65 | Wife | — | Austria |
| 43 | Louis Friedman | 45 | Head | Substitute Teacher | Pennsylvania |
| 44 | Dorothy Friedman | 39 | Wife | — | New York |
| 45 | Malcolm Friedman | 13 | Son | — | New York |
| 46 | Archie Kaufman | 30 | Head | Bldg Construction | Connecticut |
| 47 | Bertha Kaufman | 24 | Wife | — | New York |
| 48 | Jacob Dicker | 48 | Head | Projectionist | New York |
| 49 | Reina Dicker | 45 | Wife | — | France |
| 50 | Herbert Pratt | 49 | Head | Bookkeeper | New Jersey |
| 51 | Lucienne Pratt | 44 | Wife | — | France |
| 52 | Raymond Dilg | 46 | Head | Route Salesman | Ohio |
| 53 | Alberta Dilg | 41 | Wife | — | New York |
| 54 | Howard Dilg | 23 | Son | Patrolman | New York |
| 55 | Raymond Dilg | 21 | Son | Asst. Mgr. Research | New York |
| 56 | Charles Glover | 43 | Head | Accountant | New York |
| 57 | Genevieve Glover | 38 | Wife | Clerk | New York |
| 58 | Saturno Pasqua | 44 | Head | Waiter | Italy |
| 59 | Mary Pasqua | 29 | Wife | — | Italy |
| 60 | Valadio Pasqua | 13 | Son | — | New York |
| 61 | Cono Pasqua | 6 | Son | — | New York |
| 62 | Lawrence Immen | 31 | Head | Personnel Director | New York |
| 63 | Dorothy Immen | 25 | Wife | Secretary | New York |
| 64 | Aaron Feldman | 44 | Head | Salesman | New Jersey |
| 65 | Minnie Feldman | 37 | Wife | — | Russia |
| 66 | Robert Feldman | 7 | Son | — | New Jersey |
| 67 | Samuel Feldman | 3 | Son | — | New York |
| 68 | Henry Timpe | 39 | Head | Superintendent | Germany |
| 69 | Dorothy Timpe | 50 | Wife | — | Germany |
| 70 | Hans Timpe | 14 | Son | — | New York |
| 71 | Ellen Timpe | 13 | Daughter | — | New York |
| 72 | Mary Mcmahon | 66 | Head | — | New York |
| 73 | James Mcmahon THIS PERSON | 30 | Son | Clerk | New York |
| 74 | Anna Viertel | 67 | Head | Cleaner | Eire |
| 75 | Loretta Viertel | 30 | Daughter | — | New York |
| 76 | Max Solomon | 50 | Head | Ironer | Hungary |
| 77 | Hannah Solomon | 48 | Wife | — | Hungary |
| 78 | Arthur Solomon | 22 | Son | Clerk | New York |
| 79 | Ernest Valdrich | 29 | Head | Clerk | New York |
| 80 | Ruth Valdrich | 27 | Wife | Secretary | New York |
Pedigree Summary
James
Gen 1 · 4 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)