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Mary Gillespie — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Gillespie across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gillespie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1928 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Beatrice Gillespie | Spouse | — | 56 | ~1884 |
| Mary Gillespie | Daughter | — | 12 | ~1928 |
| Eugene Gillespie | Son | — | 16 | ~1924 |
| Patrick Gillespie | Head | — | 44 | ~1896 |
| John Gillespie | Son | — | 20 | ~1920 |
| Patrick Gillespie | Son | — | 19 | ~1921 |
Census Appearances
1930
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1928 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gillespie |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 6 household members
| Surname | Gillespie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 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 Gillespie across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Gillespie
Daughter · 1940 · age 12 · b. ~1928 · Illinois
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Sibling
Eugene Gillespie
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Gillespie
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Gillespie
Sibling · 1940 · age 20
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
39 people indexed on this census page (nara:1940:m-t0627-01010-00904)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Samuel Metts | 30 | Head | Moulder | Texas |
| 2 | Rose Metts | 21 | Wife | — | Texas |
| 3 | Wayne Metts | 1 | Son | — | — |
| 4 | Ottis Walden | 24 | Head | Truck Driver | Florida |
| 5 | Connie Walden | 36 | Wife | Seamstress | Alabama |
| 6 | Agnes Kessler | 55 | Head | Maid | Illinois |
| 7 | Theron Maddox | 46 | Head | Inspector | Georgia |
| 8 | Stella Maddox | 26 | Wife | — | Illinois |
| 9 | Rose Scott | 45 | Head | Dress Maker | Oklahoma |
| 10 | Edwina Scott | 19 | Daughter | — | Oklahoma |
| 11 | Vida Shafer | 37 | Head | — | Wisconsin |
| 12 | Norman Fredke | 34 | Head | Assembler | Illinois |
| 13 | Helen Fredke | 18 | Wife | Manager | Illinois |
| 14 | John Fredke | 1 | Son | — | — |
| 15 | Jack Schuh | 51 | Head | Watchman | Illinois |
| 16 | Esther Schuh | 38 | Wife | — | Wisconsin |
| 17 | Luretta Hurst | 59 | Lodger | — | Ohio |
| 18 | Helmut Koenigman | 37 | Head | Teacher | Free State Danzig |
| 19 | Evelyn Koenigman | 27 | Wife | — | Minnesota |
| 20 | Karl Bernert | 57 | Head | Metal Machinist | Hungary |
| 21 | Joseph Rosenberg | 24 | Head | Chauffeur | Illinois |
| 22 | John Thomas | 48 | Head | Shipping Clerk | Illinois |
| 23 | Hilda Thomas | 46 | Wife | — | Wisconsin |
| 24 | James Kelly | 22 | Head | Metal Machinist | Illinois |
| 25 | Franklin Bauer | 22 | Head | Machine Setter | Illinois |
| 26 | Adeline Bauer | 27 | Wife | Punch Press Operator | Poland |
| 27 | Allen Mcphee | 14 | Head | — | New York |
| 28 | Marguerite Mcphee | 22 | Wife | — | New York |
| 29 | Lena Rauch | 70 | Head | — | Michigan |
| 30 | Patrick Gillespie | 44 | Head | Laborer | Eire |
| 31 | Beatrice Gillespie | 56 | Wife | — | Ireland |
| 32 | John Gillespie | 20 | Son | Elevator Operator | Illinois |
| 33 | Patrick Gillespie | 19 | Son | Bus Boy | Illinois |
| 34 | Eugene Gillespie | 16 | Son | — | Illinois |
| 35 | Mary Gillespie THIS PERSON | 12 | Daughter | — | Illinois |
| 36 | Mabel Masterson | 46 | Head | Maid | Illinois |
| 37 | Raymond Masterson | 24 | Son | Chemist | Illinois |
| 38 | Gilbert Masterson | 28 | Son | Laborer | Illinois |
| 39 | Walter Masterson | 27 | Son | New Worker | 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)