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Mary French — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary French across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | French |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Melrose Park |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary French | Daughter | — | 15 | ~1925 |
| Virginia French | Daughter | — | 17 | ~1923 |
| Anna French | Daughter | — | 10 | ~1930 |
| Marcella French | Daughter | — | 13 | ~1927 |
| Melvin French | Head | — | 47 | ~1893 |
| Stephen French | Son | — | 18 | ~1922 |
| Norman French | Son | — | 7 | ~1933 |
| Melvin French | Son | — | 20 | ~1920 |
| Mary French | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Daughter, age 5
Cook, Illinois · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | French |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Austria |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 15
Cook-County, Illinois · implied b. ~1925 — 9 household members
| Surname | French |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Illinois |
| 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 French across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary French
Daughter · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Anna French
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norman French
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marcella French
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen French
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Melvin French
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia French
Sibling · 1940 · age 17
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-t0627-00788-00275)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Milo Knox | 35 | Head | Maintenance | Michigan |
| 2 | Othelia Knox | 30 | Wife | Power Machine Operator | Illinois |
| 3 | Elizabeth Knox | 9 | Daughter | — | Illinois |
| 4 | Kenneth Knox | 7 | Son | — | Illinois |
| 5 | Rose Shapiro | 73 | Head | — | Latvia |
| 6 | Charles Shapiro | 40 | Son | Mechanic | Illinois |
| 7 | Arthur Shapiro | 36 | Son | Salesman | Illinois |
| 8 | Nellie Allen | 91 | Lodger | — | Lithuania |
| 9 | Andrew Hoagland | 70 | Head | — | Sweden |
| 10 | Anna Hoagland | 65 | Wife | — | Sweden |
| 11 | Harry Hoagland | 33 | Son | Watchman | Michigan |
| 12 | Rudolf Hoagland | 32 | Son | Spring Maker | Illinois |
| 13 | Lester Keating | 39 | Head | Electrician | Illinois |
| 14 | Alice Keating | 34 | Wife | — | Minnesota |
| 15 | James Keating | 9 | Son | — | Illinois |
| 16 | Catherine Keating | 8 | Daughter | — | Illinois |
| 17 | Sarah Keating | 7 | Daughter | — | Illinois |
| 18 | Robert Keating | 4 | Son | — | Illinois |
| 19 | Alice Keating | 2 | Daughter | — | Illinois |
| 20 | Gerald Peacock | 35 | Partner | Car Salesman | Illinois |
| 21 | Marian Peacock | 32 | Wife | Office Clerk | Illinois |
| 22 | Joan H. B. Peacock | 11 | Daughter | — | Illinois |
| 23 | Gerald Peacock | 6 | Son | — | Illinois |
| 24 | Melvin French | 47 | Head | Foreman | Illinois |
| 25 | Mary French | 45 | Wife | — | Poland |
| 26 | Melvin French | 20 | Son | — | Illinois |
| 27 | Stephen French | 18 | Son | Maintenance Man | Illinois |
| 28 | Virginia French | 17 | Daughter | Candy Wrapper | Illinois |
| 29 | Mary French THIS PERSON | 15 | Daughter | — | Illinois |
| 30 | Marcella French | 13 | Daughter | — | Illinois |
| 31 | Anna French | 10 | Daughter | — | Illinois |
| 32 | Norman French | 7 | Son | — | Illinois |
| 33 | George Bertrand | 77 | Head | — | Michigan |
| 34 | Pauline Balgeman | 59 | Keeper | Housekeeper | Illinois |
| 35 | Adam Sphone | 45 | Head | Mill Worker | Italy |
| 36 | Victoria Sphone | 39 | Wife | — | Italy |
| 37 | Peter Sphone | 16 | Son | New Worker | Illinois |
| 38 | Joseph Sphone | 15 | Son | New Worker | Illinois |
| 39 | Elizabeth Sphone | 13 | Daughter | — | Illinois |
| 40 | Anthony Sphone | 10 | 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)