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 Daniel & John — first a son (b.~1911), then head of a 19-person household.
Age 29
b. ~1911
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 | 29 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | New York |
| Additional Details | |
| Occupation | Manager |
| Industry | Theatre |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1300 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Manager |
| Township / Ward | New York City |
| Est. Birth Year | ~1911 |
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.
19 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Charles Duffy | Other | — | 55 | ~1885 |
| Dave Kiernan | Other | — | 30 | ~1910 |
| Peter Momberger | Other | — | 46 | ~1894 |
| James Flood | Other | — | 65 | ~1875 |
| Luis Pasmino | Other | — | 38 | ~1902 |
| Mary Mckenna | Other | — | 60 | ~1880 |
| Peter Hammill | Other | — | 54 | ~1886 |
| Richard Chan | Other | — | 18 | ~1922 |
| Sarah Hughes | Other | — | 55 | ~1885 |
| Chin Wah | Other | — | 43 | ~1897 |
| John Mcmahon | Head | — | 58 | ~1882 |
| Catherine Mcmahon | Spouse | — | 53 | ~1887 |
| James Thomas | Other | — | 39 | ~1901 |
| Thomas Mcmahon | Son | — | 29 | ~1911 |
| Bridget Brennan | Other | — | 78 | ~1862 |
| Joseph Slaughnessy | Other | — | 40 | ~1900 |
| John Finnigan | Other | — | 42 | ~1898 |
| Lawrence Mcmahon | Son | — | 26 | ~1914 |
| Michael Ennis | Other | — | 45 | ~1895 |
Census Appearances
1920
New York, …
Son, age 10
New York, New York · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
New York, …
Son, age 19
New York, New York · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | laundryman |
| Industry | laundry |
| 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 29
New-York-County, New York · implied b. ~1911 — 19 household members
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | New York |
| Occupation | Manager |
| Industry | Theatre |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1300 |
| Highest Grade | Hs 1 |
| 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 Thomas Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Daniel Mcmahon (~0.92 confidence) and father John Mcmahon (~0.92 confidence) and father Thomas Mcmahon (~0.92 confidence) and mother Catherine Mcmahon (~0.92 confidence) and mother Katie Mcmahon (~0.92 confidence) and mother Mary Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Daniel Mcmahon
b. ~1875
Source father
● Household
· direct · ~0.92
Father
John Mcmahon
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Thomas Mcmahon
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Catherine Mcmahon
b. ~1887
Source mother
● Household
· direct · ~0.92
Mother
Katie Mcmahon
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Mary Mcmahon
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Son · 1940 · age 29 · b. ~1911 · New York
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Sibling
Lawrence Mcmahon
Sibling · 1940 · age 26
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-t0627-02632-00465)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Michael Linden | 22 | Son | Packer | New York |
| 42 | Jane Linden | 25 | Daughter | Sorter | New York |
| 43 | William Walker | 47 | Lodger | Clerk | New York |
| 44 | George Rogol | 57 | Head | Glazier | Russia |
| 45 | Fanny Rogol | 54 | Wife | — | Russia |
| 46 | Abraham Rogol | 27 | Son | Shipping Clerk | New York |
| 47 | David Rogol | 25 | Son | Salesman | New York |
| 48 | Flora Rogol | 23 | Daughter | Stenographer | New York |
| 49 | Jeremiah Twomey | 47 | Head | Clerk | Eire |
| 50 | Margaret Twomey | 47 | Wife | — | Eire |
| 51 | Catherine Twomey | 17 | Daughter | — | New York |
| 52 | Edmond Twomey | 15 | Son | — | New York |
| 53 | Margaret Twomey | 11 | Daughter | — | New York |
| 54 | John Mcmahon | 58 | Head | Manager | Eire |
| 55 | Catherine Mcmahon | 53 | Wife | — | Eire |
| 56 | Lawrence Mcmahon | 26 | Son | Clerk | New York |
| 57 | Thomas Mcmahon THIS PERSON | 29 | Son | Manager | New York |
| 58 | Bridget Brennan | 78 | Lodger | — | Eire |
| 59 | Mary Mckenna | 60 | Lodger | — | Eire |
| 60 | Charles Duffy | 55 | Lodger | Laborer | New York |
| 61 | John Finnigan | 42 | Lodger | Porter | Eire |
| 62 | James Higgins Thomas | 39 | Lodger | Laborer | Eire |
| 63 | Luis Pasmino | 38 | Lodger | Elevator Oper. | Ecuador |
| 64 | Peter Momberger | 46 | Lodger | Porter | Germany |
| 65 | Sarah Hughes | 55 | Lodger | — | Eire |
| 66 | Dave Kiernan | 30 | Lodger | Floorman | Eire |
| 67 | Richard Chan | 18 | Lodger | Busboy | China |
| 68 | Chin Ying Wah | 43 | Lodger | Cook | Oregon |
| 69 | Michael Ennis | 45 | Lodger | Porter | Eire |
| 70 | Peter Hammill | 54 | Lodger | Porter | Eire |
| 71 | Joseph Slaughnessy | 40 | Lodger | Clerk | Eire |
| 72 | James Flood | 65 | Lodger | — | New York |
| 73 | Mary Smith | 64 | Head | Owner | Eire |
| 74 | Michael Shivery | 42 | Lodger | Str. Iron Worker | Pennsylvania |
| 75 | Joseph Miller | 60 | Lodger | Waiter | New York |
| 76 | Margaret Jackson | 73 | Lodger | — | England |
| 77 | Bella Partington | 47 | Lodger | Clerk | New York |
| 78 | Jane Flynn | 64 | Head | Operator | Eire |
| 79 | Robert Wormick | 34 | Lodger | Accountant | Lithuania |
| 80 | James Angles | 29 | Lodger | Waiter | New York |
Related Census Records
Pedigree Summary
Thomas + 1 sibling
Gen 1 · 6 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)