MC
Mary Crosby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Crosby across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1913), then head of a 10-person household.
Age 27
b. ~1913
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Crosby |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Laundry Girl |
| Industry | Laundry |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 485 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laundry Girl |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1913 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Christ Crosby | Son | — | 15 | ~1925 |
| John Crosby | Son | — | 22 | ~1918 |
| William Crosby | Son | — | 19 | ~1921 |
| Anna Crosby | Daughter | — | 15 | ~1925 |
| Mary Crosby | Spouse | — | 49 | ~1891 |
| William Crosby | Other | — | 8 | ~1932 |
| Mary Crosby | Daughter | — | 27 | ~1913 |
| James Crosby | Son | — | 29 | ~1911 |
| James Crosby | Head | — | 62 | ~1878 |
| Rita Crosby | Daughter | — | 17 | ~1923 |
Census Appearances
1930
Cook, Illinois
Daughter, age 17
Cook, Illinois · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crosby |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 27
Cook-County, Illinois · implied b. ~1913 — 10 household members
| Surname | Crosby |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Laundry Girl |
| Industry | Laundry |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 485 |
| Highest Grade | No 7 |
| 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 Crosby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Crosby
Daughter · 1940 · age 27 · b. ~1913 · Illinois
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Sibling
John Crosby
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Crosby
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Crosby
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Crosby
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Crosby
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Christ Crosby
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-t0627-00941-00670)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ollie Darity | 59 | Head | — | Ohio |
| 42 | Elizabeth Bates | 34 | Daughter | — | Kansas |
| 43 | James Bates | 3 | Son | — | Illinois |
| 44 | William Karnhowski | 15 | Daughter | — | Illinois |
| 45 | Hattie Wilson | 52 | Head | — | Georgia |
| 46 | Virginia Fletcher | 34 | Daughter | Housework | Georgia |
| 47 | Rosalie Harris | 20 | Daughter | Housework | Georgia |
| 48 | Sam Fletcher | 14 | Son | — | Georgia |
| 49 | Geneva Fletcher | 12 | Daughter | — | Georgia |
| 50 | Annette Fletcher | 2 | Daughter | — | Illinois |
| 51 | Harley Tinsley | 60 | Lodger | Chicken Picker | Georgia |
| 52 | Anthony Prusaitis | 36 | Head | Laborer | Lithuania |
| 53 | Joseph Tamulas | 56 | Head | 36 | Lithuania |
| 54 | Sam Yuskis | 46 | Lodger | Porter | Lithuania |
| 55 | James Crosby | 62 | Head | — | Ireland |
| 56 | Mary Crosby | 49 | Wife | — | Ireland |
| 57 | James Crosby | 29 | Son | Core Maker | Illinois |
| 58 | John A. Crosby | 22 | Son | — | Illinois |
| 59 | William Crosby | 19 | Son | — | Illinois |
| 60 | Rita Crosby | 17 | Daughter | — | Illinois |
| 61 | Anna Crosby | 15 | Daughter | — | Illinois |
| 62 | Mary Crosby THIS PERSON | 27 | Daughter | Laundry Girl | Illinois |
| 63 | Christ Crosby | 15 | Son | — | Illinois |
| 64 | William Crosby | 8 | Grandson | — | Illinois |
| 65 | Hendrix A. Gentry | 54 | Head | Car Repair | Alabama |
| 66 | Mabell Gentry | 48 | Wife | — | Missouri |
| 67 | Joe Gentry | 19 | Son | Shipping Clerk | Oklahoma |
| 68 | Vera Jean Gentry | 7 | Daughter | — | Illinois |
| 69 | Cora Eagan | 60 | Lodger | — | Illinois |
| 70 | William Schuchert | 24 | Head | Material Clerk | Ohio |
| 71 | Arlene Schuchert | 24 | Wife | — | Kentucky |
| 72 | Juanita Schuchert | 5 | Daughter | — | Illinois |
| 73 | Ronald Schuchert | 3 | Son | — | Illinois |
| 74 | Kenneth Schuchert | 1 | Son | — | Illinois |
| 75 | James Byers | 36 | Head | Electrician | Indiana |
| 76 | Eunice Byers | 24 | Wife | — | California |
| 77 | James Byers | 2 | Son | — | Indiana |
| 78 | John Finnegan | 37 | Lodger | Laborer | Ireland |
| 79 | Francis Mcnellis | 35 | Head | Fireman | Illinois |
| 80 | Mildred Mcnellis | 30 | Wife | Waitress | Illinois |
Related Census Records
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)