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Mary Mathis — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mathis across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Mathis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | index clerk |
| Industry | retail merchandise |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Index Clerk |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1920 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Charles Mathis | Head | — | 56 | ~1884 |
| Helen Mathis | Daughter | — | 25 | ~1915 |
| Annie Mathis | Spouse | — | 55 | ~1885 |
| Ray Mathis | Son | — | 14 | ~1926 |
| Mary Mathis | Daughter | — | 20 | ~1920 |
| Dolores Mathis | Daughter | — | 10 | ~1930 |
| Robert Mathis | Son | — | 15 | ~1925 |
Census Appearances
1930
Cook, Illinois
Daughter, age 9
Cook, Illinois · implied b. ~1921 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mathis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 20
Cook-County, Illinois · implied b. ~1920 — 7 household members
| Surname | Mathis |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | index clerk |
| Industry | retail merchandise |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| 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 Mathis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mathis
Daughter · 1940 · age 20 · b. ~1920 · Illinois
★ You are viewing this record
Sibling
Ray Mathis
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mathis
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolores Mathis
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mathis
Sibling · 1940 · age 15
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 — 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-t0627-01023-00976)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Josephine Feret | 47 | Wife | — | Poland |
| 2 | Stanley Feret | 24 | Son | Assembler | Illinois |
| 3 | Leo Feret | 23 | Son | Baseball Player | Illinois |
| 4 | Florence Feret | 14 | Daughter | — | Illinois |
| 5 | Charles Mathis | 56 | Head | Maintenance Man | Illinois |
| 6 | Annie Mathis | 55 | Wife | — | Illinois |
| 7 | Helen Mathis | 25 | Daughter | Presser | Illinois |
| 8 | Mary Mathis THIS PERSON | 20 | Daughter | Index Clerk | Illinois |
| 9 | Robert Mathis | 15 | Son | — | Illinois |
| 10 | Ray Mathis | 14 | Son | — | Illinois |
| 11 | Dolores Mathis | 10 | Daughter | — | Illinois |
| 12 | John Krol | 45 | Head | Wheel Maker | Poland |
| 13 | Sadie Krol | 40 | Wife | — | Poland |
| 14 | Robert Krol | 18 | Son | Assembler | Illinois |
| 15 | Edwin Krol | 17 | Son | New Worker | Illinois |
| 16 | Irene Krol | 9 | Daughter | — | Illinois |
| 17 | Julia Platek | 46 | Head | — | Poland |
| 18 | Cecelia Platek | 26 | Daughter | Beauty Operator | Illinois |
| 19 | Martha Platek | 24 | Daughter | Shipping Clerk | Illinois |
| 20 | Emil Platek | 22 | Son | Merchandiser | Illinois |
| 21 | Eleanore Platek | 20 | Daughter | Shipping Clerk | Illinois |
| 22 | Leonard Platek | 17 | Son | Helper | Illinois |
| 23 | Walter Schlueter | 38 | Head | Fireman | Michigan |
| 24 | Loretta Schlueter | 35 | Wife | — | Illinois |
| 25 | Anna Mae Schlueter | 16 | Daughter | — | Illinois |
| 26 | Walter H. Jr. Schlueter | 14 | Son | — | Illinois |
| 27 | Robert Schlueter | 10 | Son | — | Illinois |
| 28 | Anna Groendyke | 43 | Head | New Worker | Illinois |
| 29 | Jane Ann Groendyke | 7 | Niece | — | Illinois |
| 30 | Raymond Schroeder | 37 | Head | Truck Driver | Illinois |
| 31 | Mary Schroeder | 33 | Wife | — | Illinois |
| 32 | Raymond, Jr. Schroeder | 6 | Son | — | Illinois |
| 33 | Marie Hartican | 61 | Head | — | Wisconsin |
| 34 | Richard Paulsen | 34 | Nephew | Machinist Buffer | Maine |
| 35 | Harry Nelson | 50 | Head | — | Michigan |
| 36 | Judith Nelson | 51 | Wife | Shoe Maker | Sweden |
| 37 | Pearl Nelson | 18 | Daughter | — | Illinois |
| 38 | Fred Schmitt | 36 | Head | Bench Machinist | Germany |
| 39 | Katherine Schmitt | 35 | Wife | — | Austria |
| 40 | Marilyn Schmitt | 5 | Daughter | — | 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)