TM
Thomas Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Champaign-County, Illinois
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in Champaign-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 5-person household.
Age 62
b. ~1878
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Champaign-County, Illinois |
| Surname | McMahon |
| Given Name | Thomas D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Tolono Twp |
| 1935 Residence (County) | Champaign |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Tolono Twp |
| Est. Birth Year | ~1878 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Reatha Mcmahon | Daughter | — | 15 | ~1925 |
| Mary Mcmahon | Spouse | — | 52 | ~1888 |
| Vlyn Mcmahon | Daughter | — | 17 | ~1923 |
| Thomas Mcmahon | Head | — | 62 | ~1878 |
| Lawrence Mcmahon | Son | — | 13 | ~1927 |
Census Appearances
1920
Champaign, Illinois
Head, age 46
Champaign, Illinois · implied b. ~1874 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | New York |
| Mother's Birthplace | Canada |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Champaign, Illinois
Head, age 57
Champaign, Illinois · implied b. ~1873 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 29 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Champaign-County, Illinois
Head, age 62
Champaign-County, Illinois · implied b. ~1878 — 5 household members
| Surname | McMahon |
| Given Name | Thomas D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Tolono Twp |
| 1935 Residence (County) | Champaign |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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.
Show:
This person
Anchor record
Thomas Mcmahon
Head · 1940 · age 62 · b. ~1878 · 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 — Champaign-County, Illinois
Open full size
1940 US Federal Census — Champaign-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00766-00938)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Homer D. Easterbrook | 62 | Head | Farm Hand | Illinois |
| 2 | Barbara Easterbrook | 57 | Wife | Housework | Illinois |
| 3 | R. Keith Easterbrook | 17 | Son | — | Illinois |
| 4 | Paul Black | 40 | Boarder | Farm Hand | Illinois |
| 5 | Joseph M. Bond | 36 | Head | Farmer | Illinois |
| 6 | Lucille Bond | 35 | Wife | Housewife | Illinois |
| 7 | Joan Bond | 7 | Daughter | — | Illinois |
| 8 | Robert Bond | 4 | Son | — | Illinois |
| 9 | Thomas D. Clancy | 64 | Head | Farmer | Illinois |
| 10 | Margaret Clancy | 64 | Wife | Housewife | Ireland |
| 11 | Edward D. Dades | 51 | Head | Farmer | Illinois |
| 12 | Anna Dades | 51 | Wife | Housewife | Illinois |
| 13 | Thomas D. Mcmahon THIS PERSON | 62 | Head | Farmer | Illinois |
| 14 | Mary Mcmahon | 52 | Wife | Housewife | Illinois |
| 15 | Vlyn Mcmahon | 17 | Daughter | House Work | Illinois |
| 16 | Reatha Mcmahon | 15 | Daughter | — | Illinois |
| 17 | Lawrence Mcmahon | 13 | Son | — | Illinois |
| 18 | Frank D. Revell | 34 | Head | Farmer | Illinois |
| 19 | Pauline Revell | 27 | Wife | Housewife | Illinois |
| 20 | Wilma Revell | 4 | Daughter | — | Illinois |
| 21 | Ruth Ann Revell | 0 | Daughter | — | Illinois |
| 22 | Frank J. Bates | 55 | Head | Farmer | Illinois |
| 23 | Emma Bates | 60 | Wife | Housewife | Illinois |
| 24 | Burley D. Brooks | 55 | Hired man | Farm Hand | Kentucky |
| 25 | Fred D. Endicott | 39 | Head | Farmer | Illinois |
| 26 | Anthony Endicott | 52 | Wife | Housewife | Kentucky |
| 27 | Ernest Hale | 28 | Step son | Farm Hand | Kentucky |
| 28 | Clyde D. Barnhart | 36 | Head | Farmer | Illinois |
| 29 | Hazel Barnhart | 29 | Wife | Housewife | Illinois |
| 30 | Wilbur Barnhart | 10 | Son | — | Illinois |
| 31 | Glenn Barnhart | 8 | Son | — | Illinois |
| 32 | Elizabeth Barnhart | 3 | Daughter | — | Illinois |
| 33 | Thomas D. Barnhart | 1 | Son | — | Illinois |
| 34 | Jeff D. Bily | 56 | Head | Farmer | Illinois |
| 35 | Ada Bily | 64 | Wife | Housewife | Illinois |
| 36 | Wilford D. Joyce | 42 | Head | Farmer | Illinois |
| 37 | Cora Hopkins | 59 | Housekeeper | Housekeeper | Illinois |
| 38 | Francis D. Rutledge | 40 | Head | Farmer | Illinois |
| 39 | Eva Rutledge | 37 | Wife | Housewife | Illinois |
| 40 | Billy Rutledge | 8 | Son | — | 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)