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Mary Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Madison-County, Illinois
Our Model Tree links this Mary Mcmahon across the 1920, 1930 and 1940 US Censuses in Madison-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1873), then head of a 5-person household.
Age 67
b. ~1873
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Madison-County, Illinois |
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Venice City |
| 1935 Residence (County) | Madison |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Venice City |
| Est. Birth Year | ~1873 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Minnie Robinson | Daughter | — | 40 | ~1900 |
| Charles Mcmahon | Head | — | 65 | ~1875 |
| Tony Janin | Other | — | 65 | ~1875 |
| Kenneth Robinson | Other | — | 17 | ~1923 |
| Mary Mcmahon | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Madison, Illinois
Other, age 44
Madison, Illinois · implied b. ~1876 — 26 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Inmate |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Madison, Illinois
Other, age 56
Madison, Illinois · implied b. ~1874 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | inmate |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Missouri |
| Occupation | imbecile |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Madison-County, Illinois
Spouse, age 67
Madison-County, Illinois · implied b. ~1873 — 5 household members
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Venice City |
| 1935 Residence (County) | Madison |
| Highest Grade | No 4 |
| 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 Mary 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
Mary Mcmahon
Spouse · 1940 · age 67 · b. ~1873 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Madison-County, Illinois
Open full size
1940 US Federal Census — Madison-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00851-00421)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Jean Roberts | 11 | Nephew | — | Illinois |
| 42 | Robert Mitchell | 24 | Lodger | Laborer | Illinois |
| 43 | Robert Dunbar | 26 | Head | Trucker | Kansas |
| 44 | Rosalene Dunbar | 28 | Wife | — | Illinois |
| 45 | Betty Jean Dunbar | 3 | Daughter | — | Illinois |
| 46 | Lilly Fulgham | 57 | Lodger | Seamstress | Illinois |
| 47 | Pearl Fulgham | 23 | Lodger | — | Illinois |
| 48 | Thelma Fulgham | 20 | Lodger | Seamstress | Illinois |
| 49 | James Mcqueen | 67 | Lodger | Labor | Illinois |
| 50 | John Little | 58 | Head | Grocery | Illinois |
| 51 | Winnie Little | 54 | Wife | — | Illinois |
| 52 | Henry Meinecke | 70 | Head | Grocery | Missouri |
| 53 | Josephine Meinecke | 68 | Wife | — | Missouri |
| 54 | Mabel Steenmeyer | 55 | Lodger | — | Illinois |
| 55 | Fred Klaener | 40 | Head | Priest | Illinois |
| 56 | Stella Stallman | 66 | Housekeeper | Housekeeper | Illinois |
| 57 | Norman Roberts | 48 | Head | Switchman | Illinois |
| 58 | Frieda Roberts | 46 | Wife | — | Illinois |
| 59 | John Roberts | 21 | Son | Clerical | Illinois |
| 60 | Lee Roberts | 19 | Son | Never | Illinois |
| 61 | Archie Cooper | 30 | Head | Labor | Illinois |
| 62 | Gertrude Cooper | 30 | Wife | Candler | Illinois |
| 63 | Eugene Cooper | 5 | Son | — | Illinois |
| 64 | Ralph Cooper | 3 | Son | — | Illinois |
| 65 | Claude Cooper | 1 | Son | — | Illinois |
| 66 | Charles Mcmahon | 65 | Head | Barber | Illinois |
| 67 | Mary Mcmahon THIS PERSON | 67 | Wife | — | Illinois |
| 68 | Minnie Robinson | 40 | Daughter | Housework | Illinois |
| 69 | Kenneth Robinson | 17 | Grandson | — | Illinois |
| 70 | Tony Janin | 65 | Brother-in-law | — | Illinois |
| 71 | Jack Goodrich | 53 | Head | Operator | Illinois |
| 72 | Lena Goodrich | 50 | Wife | — | Illinois |
| 73 | Lewis Goodrich | 24 | Son | — | Illinois |
| 74 | George Cook | 30 | Head | Spotter | Illinois |
| 75 | Dorothy Cook | 29 | Wife | — | Illinois |
| 76 | Donald Cook | 1 | Son | — | Illinois |
| 77 | William Tice | 29 | Head | Service Mgr | Illinois |
| 78 | Thelma Tice | 27 | Wife | — | Illinois |
| 79 | Billie Jean Tice | 3 | Daughter | — | Illinois |
| 80 | Charles Dean | 57 | Head | Telegrapher | Missouri |
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)