TM
Thomas Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.
Age 60
b. ~1880
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Motorman |
| Industry | Surface Lines |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 480 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Motorman |
| Township / Ward | Chicago |
| Est. Birth Year | ~1880 |
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 |
|---|---|---|---|---|
| Ellen Mcmahon | Spouse | — | 59 | ~1881 |
| Irene Mcmahon | Daughter | — | 24 | ~1916 |
| Robert Mcmahon | Son | — | 26 | ~1914 |
| Thomas Mcmahon | Head | — | 60 | ~1880 |
Census Appearances
1920
Cook, Illinois
Other, age 39
Cook, Illinois · implied b. ~1881 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thos |
| Relationship to Head | boarder |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1913 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Shipping Clerk |
| Industry | Mail Order House |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Cook, Illinois
Head, age 49
Cook, Illinois · implied b. ~1881 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Ireland |
| Age at First Marriage | 32 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Police Officer |
| Industry | City |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 35 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Head, age 60
Cook-County, Illinois · implied b. ~1880 — 4 household members
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Motorman |
| Industry | Surface Lines |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 480 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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.
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This person
Anchor record
Thomas Mcmahon
Head · 1940 · age 60 · b. ~1880 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00945-00124)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Francis Finnegan | 22 | Son | Bill Clk | Illinois |
| 42 | Raymond Finnegan | 21 | Son | Helper | Illinois |
| 43 | Thomas Finnegan | 16 | Son | — | Illinois |
| 44 | Joe Finnegan | 9 | Son | — | Illinois |
| 45 | Nora Carney | 36 | Sister-in-law | Stenographer | Illinois |
| 46 | Jas Hink | 45 | Head | Chauffeur | Illinois |
| 47 | Marie Hink | 20 | Daughter | Telephone Oper | Illinois |
| 48 | Doris Hink | 17 | Daughter | — | Illinois |
| 49 | Dennis Cronin | 44 | Boarder | Laborer | Illinois |
| 50 | Bruno Hunter | 54 | Head | Chauffeur | Germany |
| 51 | Julia Hunter | 48 | Wife | — | Illinois |
| 52 | Grace Hunter | 26 | Son | — | Illinois |
| 53 | Louise Hunter | 25 | Daughter | Receipts Clk | Illinois |
| 54 | Bruno Jr. Hunter | 23 | Son | Draftsman | Illinois |
| 55 | Anna Hunter | 21 | Daughter | File Clerk | Illinois |
| 56 | Richard Hunter | 19 | Son | Kitchen Helper | Illinois |
| 57 | Paul Hunter | 10 | Son | — | Illinois |
| 58 | Walter Hager | 45 | Head | Machinist | Illinois |
| 59 | Anne Hager | 43 | Wife | — | Illinois |
| 60 | Vernon Hager | 17 | Son | — | Illinois |
| 61 | Jean Vezzani | 48 | Head | Baker | Italy |
| 62 | Fanny Vezzani | 46 | Wife | — | Italy |
| 63 | Regina Vezzani | 25 | Daughter | Stenographer | Italy |
| 64 | Lina Vezzani | 18 | Daughter | — | Illinois |
| 65 | Gino Vezzani | 13 | Son | — | Illinois |
| 66 | Lina Focosi | 34 | Sister-in-law | Button Hole | Italy |
| 67 | John Russo | 35 | Head | Salesman | New York |
| 68 | Jean Russo | 24 | Wife | Cashier | Illinois |
| 69 | Lawrence Russo | 2 | Son | — | Illinois |
| 70 | Loretta Russo | 1 | Daughter | — | Illinois |
| 71 | Thomas Mcmahon THIS PERSON | 60 | Head | Motorman | Ireland |
| 72 | Ellen Mcmahon | 59 | Wife | — | Ireland |
| 73 | Robert Mcmahon | 26 | Son | Typist | Illinois |
| 74 | Irene Mcmahon | 24 | Daughter | Telephone Oper | Illinois |
| 75 | Leslie Hungerford | 41 | Head | Machinist | Illinois |
| 76 | Marie Hungerford | 41 | Wife | — | Illinois |
| 77 | Leslie Hungerford | 80 | Father | — | Illinois |
| 78 | Chas Johnson | 71 | Head | — | Sweden |
| 79 | Anna Johnson | 71 | Wife | — | Sweden |
| 80 | Carl Brand | 39 | Son-in-law | Automobile Mechanic | Illinois |
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)