TM
Thomas Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · New-York-County, New York
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in New-York-County, New York (XGBoost, ~Confirmed), with identified parents Dennis & Thomas — first a son (b.~1918), then head of a 6-person household.
Age 22
b. ~1918
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | New-York-County, New York |
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | NEW YORK |
| Additional Details | |
| Occupation | Clerk |
| Industry | Retail Grocer |
| Class of Worker | PW |
| Hours Worked | 35 |
| Income (1939) | 390 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Clerk |
| Township / Ward | New York City |
| Est. Birth Year | ~1918 |
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 Thomas | Age | Birth yr |
|---|---|---|---|---|
| Dennis Mcmahon | Head | — | 54 | ~1886 |
| Lawrence Mcmahon | Son | — | 12 | ~1928 |
| Margaret Mcmahon | Daughter | — | 19 | ~1921 |
| Thomas Mcmahon | Son | — | 22 | ~1918 |
| Edward Mcmahon | Son | — | 14 | ~1926 |
| Anna Mcmahon | Spouse | — | 46 | ~1894 |
Census Appearances
1920
New York, …
Other, age 2
New York, New York · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
New York, …
Son, age 12
New York, New York · implied b. ~1918 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
New-York-County, New …
Son, age 22
New-York-County, New York · implied b. ~1918 — 6 household members
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | NEW YORK |
| Occupation | Clerk |
| Industry | Retail Grocer |
| Class of Worker | PW |
| Hours Worked | 35 |
| Income (1939) | 390 |
| 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 Thomas Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dennis Mcmahon (~0.92 confidence) and father Thomas Mcmahon (~0.92 confidence) and mother Anna Mcmahon (~0.92 confidence) and mother Anna Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Dennis Mcmahon
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Thomas Mcmahon
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Anna Mcmahon
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Anna Mcmahon
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Son · 1940 · age 22 · b. ~1918 · New York
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Sibling
Margaret Mcmahon
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Mcmahon
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward 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-t0627-02658-00882)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Ash | 1 | Son | — | New York |
| 2 | Walter Wallace | 26 | Head | Clerk | New York |
| 3 | Ella Wallace | 23 | Wife | — | New York |
| 4 | Walter Jr. Wallace | 4 | Son | — | New York |
| 5 | Dennis Mcmahon | 54 | Head | Deckhand | New York |
| 6 | Anna Mcmahon | 46 | Wife | — | New York |
| 7 | Thomas Mcmahon THIS PERSON | 22 | Son | Clerk | New York |
| 8 | Margaret Mcmahon | 19 | Daughter | — | New York |
| 9 | Edward Mcmahon | 14 | Son | — | New York |
| 10 | Lawrence Mcmahon | 12 | Son | — | New York |
| 11 | Otto Zippel | 71 | Head | Handy Man | Germany |
| 12 | Nellie Winkler | 60 | Head | — | Germany |
| 13 | Joseph Rinder | 53 | Head | Proprietor | Hungary |
| 14 | Elizabeth Rinder | 45 | Wife | — | Hungary |
| 15 | Paul Salamota | 57 | Head | Proprietor | Italy |
| 16 | Rose Salamota | 16 | Daughter | — | New York |
| 17 | Salvatore Salamota | 11 | Son | — | New York |
| 18 | Walter Braham | 39 | Head | Machinist | Germany |
| 19 | Anna Kiffel | 51 | Head | Maid | New York |
| 20 | Harry Alpinay | 32 | Head | Mixer | New York |
| 21 | Lillian Alpinay | 29 | Wife | — | New York |
| 22 | Fred Alpinay | 77 | Father | Hostler | France |
| 23 | William Wiesenberg | 43 | Head | Machinist | Germany |
| 24 | Fred Herman | 50 | Head | Laborer | New York |
| 25 | Alice Herman | 51 | Wife | — | New York |
| 26 | William Kuzelka | 40 | Head | Tuner | New York |
| 27 | Anton Kuzelka | 40 | Brother | Examiner | New York |
| 28 | Conrad Svenigel | 36 | Head | Asst. Span O. | New York |
| 29 | Elizabeth Svenigel | 35 | Wife | — | New York |
| 30 | John Svenigel | 13 | Son | — | New York |
| 31 | Mary Svenigel | 7 | Daughter | — | New York |
| 32 | Mary Svenigel | 69 | Mother | — | Austria-Hungary |
| 33 | Alexander Biggs | 41 | Head | Repair Man | Minnesota |
| 34 | Ethel Biggs | 44 | Wife | — | Hungary |
| 35 | Ernest Biggs | 20 | Son | Repair Man | New Jersey |
| 36 | Goldie Biggs | 16 | Daughter | — | New Jersey |
| 37 | Julia Inhrap | 65 | Mother-in-Law | — | Hungary |
| 38 | Samuel Brown | 45 | Head | Painter | Hungary |
| 39 | Edward Wright | 36 | Head | Handy Man | Turkey |
| 40 | Rosa Wright | 36 | Wife | — | New York |
Pedigree Summary
Thomas + 3 siblings
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)