TM
Thomas Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Thomas Mcmahon across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Robert Mcmahon | Son | — | 8 | ~1932 |
| Joseph Mcmahon | Son | — | 22 | ~1918 |
| John Mcmahon | Son | — | 24 | ~1916 |
| Emily Mcmahon | Spouse | — | 43 | ~1897 |
| Thomas Mcmahon | Son | — | 15 | ~1925 |
| Frances Mcmahon | Son | — | 13 | ~1927 |
| George Mcmahon | Son | — | 20 | ~1920 |
| John Mcmahon | Head | — | 48 | ~1892 |
| Florence Mcmahon | Daughter | — | 18 | ~1922 |
Census Appearances
1930
Philadelphia, Pennsylvania
Son, age 5
Philadelphia, Pennsylvania · implied b. ~1925 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Son, age 15
Philadelphia-County, Pennsylvania · implied b. ~1925 — 9 household members
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Thomas Mcmahon
Son · 1940 · age 15 · b. ~1925 · Pennsylvania
★ You are viewing this record
Sibling
Robert Mcmahon
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Mcmahon
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcmahon
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcmahon
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mcmahon
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence 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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03740-00325)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Cook | 33 | Head | Printer | Switzerland |
| 2 | Elaine Cook | 5 | Daughter | — | Pennsylvania |
| 3 | John Mcmahon | 48 | Head | Foreman | Pennsylvania |
| 4 | Emily Mcmahon | 43 | Wife | — | Pennsylvania |
| 5 | John Jr. Mcmahon | 24 | Son | Tester | Pennsylvania |
| 6 | Joseph Mcmahon | 22 | Son | Bookkeeper | Pennsylvania |
| 7 | George Mcmahon | 20 | Son | — | Pennsylvania |
| 8 | Florence Mcmahon | 18 | Daughter | — | Pennsylvania |
| 9 | Thomas Mcmahon THIS PERSON | 15 | Son | — | Pennsylvania |
| 10 | Frances Mcmahon | 13 | Son | — | Pennsylvania |
| 11 | Robert Mcmahon | 8 | Son | — | Pennsylvania |
| 12 | Wilson Wilson | 30 | Head | Chauffeur | Pennsylvania |
| 13 | Mary Wilson | 29 | Wife | — | Pennsylvania |
| 14 | Emma Wilson | 12 | Daughter | — | Pennsylvania |
| 15 | Catherine Wilson | 10 | Daughter | — | Pennsylvania |
| 16 | Peter Wilson | 62 | Father | — | Pennsylvania |
| 17 | Emma Wilson | 73 | Mother | — | Pennsylvania |
| 18 | Earl Taylor | 41 | Head | Private Chauffeur | Pennsylvania |
| 19 | Thelma Taylor | 38 | Wife | — | Pennsylvania |
| 20 | Shirley Taylor | 16 | Daughter | — | Pennsylvania |
| 21 | Earl Taylor | 11 | Son | — | Pennsylvania |
| 22 | Dolores Taylor | 6 | Daughter | — | Pennsylvania |
| 23 | Edward F. Callaghan | 49 | Head | Union Representative | Pennsylvania |
| 24 | Mary Callaghan | 48 | Wife | — | Pennsylvania |
| 25 | Edward F. Callaghan | 25 | Son | Clerk | Pennsylvania |
| 26 | Catherine Callaghan | 22 | Daughter | Examiner | Pennsylvania |
| 27 | Bernard Mccabe | 45 | Head | Pipe Fitter | Ireland |
| 28 | Catherine Mccabe | 40 | Wife | — | Ireland |
| 29 | Philip Mccabe | 9 | Son | — | Pennsylvania |
| 30 | John Mccabe | 7 | Son | — | Pennsylvania |
| 31 | Edward Mccabe | 6 | Son | — | Pennsylvania |
| 32 | Bernard Jr. Mccabe | 4 | Son | — | Pennsylvania |
| 33 | Lewis Campbell | 34 | Head | Salesman | Pennsylvania |
| 34 | Melida Campbell | 32 | Wife | — | Pennsylvania |
| 35 | Charles Campbell | 3 | Son | — | Tennessee |
| 36 | Kathryn Campbell | 0 | Daughter | — | Pennsylvania |
| 37 | Nellie Ruff | 66 | Head | Chocolate Center | Virginia |
| 38 | Herbert Ruth Ruff | 45 | Daughter | Saleslady | Virginia |
| 39 | Joseph C. Cobert | 34 | Head | Salesman | Pennsylvania |
| 40 | Marie E. Cobert | 34 | Wife | — | Pennsylvania |
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)