JM
James Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Westchester-County, New York
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Westchester-County, New York (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Westchester-County, New York |
| Surname | McMahon |
| Given Name | James Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Mt Vernon |
| 1935 Residence (County) | Westchester |
| Additional Details | |
| Occupation | Clerk |
| Industry | National Bank |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Clerk |
| Township / Ward | Mt Vernon |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Catherine Mcmahon | Daughter | — | 18 | ~1922 |
| James Mcmahon | Head | — | 48 | ~1892 |
| James Mcmahon | Son | — | 24 | ~1916 |
| Annie Mcmahon | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Nassau, New …
Son, age 2
Nassau, New York · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Nassau, New …
Son, age 13
Nassau, New York · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Westchester-County, New …
Son, age 24
Westchester-County, New York · implied b. ~1916 — 4 household members
| Surname | McMahon |
| Given Name | James Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Mt Vernon |
| 1935 Residence (County) | Westchester |
| Occupation | Clerk |
| Industry | National Bank |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| 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 Annie Mcmahon (~0.92 confidence) and mother Mabel Mcmahon (~0.92 confidence) and mother Mabel Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mcmahon
b. ~1892
Source father
● Household
· direct · ~0.92
Father
James Mcmahon
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Annie Mcmahon
b. ~1895
Source mother
● Household
· direct · ~0.92
Mother
Mabel Mcmahon
b. ~1896
Source mother
● Household
· direct · ~0.92
Mother
Mabel Mcmahon
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mcmahon
Son · 1940 · age 24 · b. ~1916 · New York
★ You are viewing this record
Sibling
Catherine Mcmahon
Sibling · 1940 · age 18
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 — Westchester-County, New York
Open full size
1940 US Federal Census — Westchester-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02808-00047)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clara Schutzman | 46 | Head | — | Austria |
| 42 | Joseph Schutzman | 25 | Son | Assistant Counterman | New York |
| 43 | Martin Schutzman | 19 | Son | — | New York |
| 44 | Eli Schutzman | 15 | Son | — | New York |
| 45 | Henrietta Schutzman | 11 | Daughter | — | New York |
| 46 | Louis Levinson | 46 | Head | Owner And Salesman | Russia |
| 47 | Fannie Levinson | 44 | Wife | — | New York |
| 48 | Amy Vivian Levinson | 17 | Daughter | Secretary | New York |
| 49 | Julius Cohen | 53 | Head | Accountant | Russia |
| 50 | Rose Cohen | 51 | Wife | — | New York |
| 51 | Cecile Cohen | 22 | Daughter | — | New York |
| 52 | Agnes Hassan | 21 | Maid | Maid | Penna |
| 53 | George Treffert | 51 | Head | Building Foreman | Germany |
| 54 | Margaret Treffert | 51 | Wife | — | Germany |
| 55 | Doris Treffert | 20 | Daughter | Clerk | New York |
| 56 | Geo Jr Treffert | 19 | Son | — | New York |
| 57 | Marie Treffert | 18 | Daughter | — | New York |
| 58 | Maurice Finkelstein | 40 | Head | Owner | New York |
| 59 | Eva Finkelstein | 37 | Wife | — | New Jersey |
| 60 | Edward Finkelstein | 15 | Son | — | New York |
| 61 | Thelma Finkelstein | 10 | Daughter | — | New York |
| 62 | Carroll M Guest | 46 | Head | Photographer | Wisconsin |
| 63 | Gladys Guest | 44 | Wife | Saleswoman | New York |
| 64 | Mary Ward Guest | 22 | Son | Teacher | New York |
| 65 | Barbara Jane Guest | 18 | Daughter | — | New York |
| 66 | Alice Tooker | 54 | Sister in L | — | New York |
| 67 | John P Berger | 29 | Head | Manager | New Jersey |
| 68 | Edna O Berger | 24 | Wife | — | New Jersey |
| 69 | Guy B Berger | 2 | Son | — | New Jersey |
| 70 | Anthony Rebholz | 37 | Head | Dentist | New York |
| 71 | Marie Rebholz | 37 | Wife | — | New York |
| 72 | Joan Marie Rebholz | 4 | Daughter | — | New York |
| 73 | Anthony Jr Rebholz | 0 | Son | — | New York |
| 74 | James Mcmahon | 48 | Head | — | Eire |
| 75 | Annie Mcmahon | 45 | Wife | — | Eire |
| 76 | James Jr Mcmahon THIS PERSON | 24 | Son | Clerk | New York |
| 77 | Catherine Mcmahon | 18 | Daughter | — | New York |
| 78 | Esther M Carlson | 40 | Head | Secretary | Connecticut |
| 79 | Nora Anna Rider | 33 | Lodger | Operator | Ohio |
| 80 | Mary V Taylor | 20 | Lodger | Clerk | Georgia |
Pedigree Summary
James + 1 sibling
Gen 1 · 5 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)