TM
Thomas Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a son (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | McMahon |
| Given Name | Thomas Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | Engineer |
| Industry | Chemical Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2663 |
| Highest Grade | Hs 4 |
| 1935 Residence | Michigan |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Engineer |
| Township / Ward | Grosse Pointe Farms Village |
| Est. Birth Year | ~1915 |
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 Thomas | Age | Birth yr |
|---|---|---|---|---|
| Thomas Mcmahon | Son | — | 25 | ~1915 |
| Eva Mcmahon | Spouse | — | 45 | ~1895 |
| Nancy Mcmahon | Daughter | — | 12 | ~1928 |
| Thomas Mcmahon | Head | — | 48 | ~1892 |
Census Appearances
1920
Wayne, Michigan
Son, age 5
Wayne, Michigan · implied b. ~1915 — 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 | 5 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1930
Wayne, Michigan
Son, age 15
Wayne, Michigan · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Can Read/Write | Yes |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Wayne-County, Michigan
Son, age 25
Wayne-County, Michigan · implied b. ~1915 — 4 household members
| Surname | McMahon |
| Given Name | Thomas Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Occupation | Engineer |
| Industry | Chemical Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2663 |
| Highest Grade | Hs 4 |
| 1935 Residence | Michigan |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Thomas Mcmahon (~0.92 confidence) and father Thomas Mcmahon (~0.92 confidence) and mother Cora Mcmahon (~0.92 confidence) and mother Eva Mcmahon (~0.92 confidence) and mother Eva Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Mcmahon
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Thomas Mcmahon
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Cora Mcmahon
b. ~1895
Source mother
● Household
· direct · ~0.92
Mother
Eva Mcmahon
b. ~1895
Source mother
● Household
· direct · ~0.92
Mother
Eva Mcmahon
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Son · 1940 · age 25 · b. ~1915 · Michigan
★ You are viewing this record
Sibling
Nancy Mcmahon
Sibling · 1940 · age 12
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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01828-00768)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Esther Moss | 18 | Maid | Maid | North Dakota |
| 2 | Extra Line | None | — | — | — |
| 3 | William Ramsay | 32 | Head | President | Michigan |
| 4 | Marguerite Ramsay | 33 | Wife | — | Wisconsin |
| 5 | William Ramsay | 4 | Son | — | Michigan |
| 6 | Robert Allan Ramsay | 2 | Son | — | Michigan |
| 7 | Hellen Mclean | 21 | Cook | Cook | Michigan |
| 8 | Ethel Barker | 25 | Nurse | Nurse | Virginia |
| 9 | Agnes Potter | 42 | Head | — | Michigan |
| 10 | Elizabeth Potter | 28 | Wife | — | Michigan |
| 11 | William C. Potter | 17 | Son | — | Michigan |
| 12 | Theodore Potter | 14 | Son | — | Michigan |
| 13 | Mavis Wilson | 26 | Maid | Maid | Michigan |
| 14 | William Clyde | 49 | Head | — | Pennsylvania |
| 15 | Mabel Clyde | 39 | Wife | — | California |
| 16 | John Belfield | 34 | Head | Representative | Pennsylvania |
| 17 | Lillian Belfield | 34 | Wife | — | Pennsylvania |
| 18 | Nancy Belfield | 5 | Daughter | — | Pennsylvania |
| 19 | Dorothy Thomas | 37 | Maid | Maid | Georgia |
| 20 | John Mccormick | 28 | Head | Salesman | Michigan |
| 21 | Sophia Mccormick | 26 | Wife | — | Michigan |
| 22 | Thomas Mcmahon | 48 | Head | Factory Manager | Michigan |
| 23 | Eva Mcmahon | 45 | Wife | — | Michigan |
| 24 | Thomas Jr. Mcmahon THIS PERSON | 25 | Son | Engineer | Minnesota |
| 25 | Nancy Ann Mcmahon | 12 | Daughter | — | Michigan |
| 26 | William Turner | 50 | Head | Broker | Michigan |
| 27 | Fay J. Turner | 49 | Wife | — | West Virginia |
| 28 | — | None | — | — | — |
| 29 | Albert Williams | 46 | Head | Chauffeur | England |
| 30 | Lillian Williams | 51 | Wife | — | Ireland |
| 31 | Victor A. Williams | 21 | Son | Salesman | New Jersey |
| 32 | Doris E. Williams | 19 | Daughter | Stenographer | New Jersey |
| 33 | Samuel Roman | 40 | Head | Superintendent | New York |
| 34 | Hilda Roman | 35 | Wife | — | Canada |
| 35 | Thomas Philip Roman | 5 | Son | — | Michigan |
| 36 | Stanford Randall | 33 | Head | Engineer | Pennsylvania |
| 37 | Elizabeth Randall | 34 | Wife | — | Pennsylvania |
| 38 | Stanford Jr. Randall | 2 | Son | — | Michigan |
| 39 | Ann Fuhrman | 21 | Maid | Maid | Michigan |
| 40 | Thomas Roberts | 45 | Head | Salesman | Kentucky |
Pedigree Summary
Thomas + 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)