MF
Mary Fox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Fox across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Harry & Abraham — first a daughter (b.~1912), then head of a 2-person household.
Age 28
b. ~1912
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Fox |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Secretary |
| Industry | loan company |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1000 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Secretary |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1912 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Fox | Daughter | — | 28 | ~1912 |
| Ellen Fox | Head | — | 54 | ~1886 |
Census Appearances
1920
Cook, Illinois
Daughter, age 8
Cook, Illinois · implied b. ~1912 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 18
Cook, Illinois · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Occupation | Entry clerk |
| Industry | Mail Order House |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 28
Cook-County, Illinois · implied b. ~1912 — 2 household members
| Surname | Fox |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Secretary |
| Industry | loan company |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1000 |
| Highest Grade | Hs 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 Fox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harry Fox (~0.92 confidence) and father Abraham Fox (~0.92 confidence) and mother Ellen Fox (~0.92 confidence) and mother Mary Fox (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Fox
b. ~1883
Source father
● Household
· direct · ~0.92
Father
Abraham Fox
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Ellen Fox
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Mary Fox
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Fox
Daughter · 1940 · age 28 · b. ~1912 · 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-t0627-00959-00015)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John O'Donnell | 49 | Head | Policeman | Eire |
| 2 | Kathleen O'Donnell | 34 | Wife | — | Eire |
| 3 | Bernard O'Donnell | 2 | Son | — | Illinois |
| 4 | John J. O'Donnell | 0 | Son | — | Illinois |
| 5 | Edward R. O'Donnell | 5 | Son | — | Illinois |
| 6 | John Zalewski | 38 | Head | Electric Welder | Illinois |
| 7 | Jessie Zalewski | 31 | Wife | — | Illinois |
| 8 | Edward Zalewski | 11 | Son | — | Illinois |
| 9 | Lorraine Zalewski | 7 | Daughter | — | Illinois |
| 10 | Ronald Zalewski | 3 | Son | — | Illinois |
| 11 | Carrie Przybylski | 21 | Sister-in-law | Packing Cartons | Illinois |
| 12 | Arthur P. Bear | 30 | Head | Foreman | Pennsylvania |
| 13 | Gladys Bear | 28 | Wife | — | Michigan |
| 14 | Thomas Bear | 4 | Son | — | Illinois |
| 15 | Theodore Bear | 2 | Son | — | Illinois |
| 16 | Maurice Waitzenfeld | 46 | Head | General Manager | Austria |
| 17 | Margaret Waitzenfeld | 42 | Wife | — | Illinois |
| 18 | Maurine Waitzenfeld | 5 | Daughter | — | Illinois |
| 19 | Marvin Waitzenfeld | 1 | Son | — | Illinois |
| 20 | Ann Hoven | 21 | Maid | Domestic | Illinois |
| 21 | Ben J. Sachtle | 51 | Head | Doctor | Illinois |
| 22 | Belle Alta Sachtle | 31 | Wife | — | Illinois |
| 23 | George Sachtle | 0 | Son | — | Illinois |
| 24 | Florence Kurrent | 56 | Mother-in-law | — | Kentucky |
| 25 | Lynn L. Matthewson | 53 | Head | Electrician | South Dakota |
| 26 | Esther M. Matthewson | 40 | Wife | — | Illinois |
| 27 | Clarabelle E. Matthewson | 7 | Daughter | — | Illinois |
| 28 | Charlotte J. Matthewson | 6 | Daughter | — | Illinois |
| 29 | Donna L. Matthewson | 2 | Daughter | — | Illinois |
| 30 | Hester S. Ross | 61 | Mother-in-law | — | Indiana |
| 31 | Ann Kugelman | 67 | Lodger | — | Wisconsin |
| 32 | Ellen B. Fox | 54 | Head | — | Illinois |
| 33 | Mary E. Fox THIS PERSON | 28 | Daughter | Secretary | Illinois |
| 34 | Lester O. Blackman | 32 | Head | Sub-Station Operator | Indiana |
| 35 | Mildred Blackman | 28 | Wife | — | Scotland |
| 36 | Ralph L. Brock | 42 | Head | Mechanical Engineer | Illinois |
| 37 | Mae Brock | 42 | Wife | — | Illinois |
| 38 | Jane Brock | 20 | Daughter | Ometer Operator | Illinois |
| 39 | Ragnar Johnson | 38 | Head | Carpenter Foreman | Sweden |
| 40 | Elsie Johnson | 39 | Wife | — | Illinois |
Pedigree Summary
Mary
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)