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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.~1916), then head of a 8-person household.
Age 24
b. ~1916
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 | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | File Clerk |
| Industry | Retail Ladies Clothing Store |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 936 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | File Clerk |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1916 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Peter Gillespie | Son | — | 23 | ~1917 |
| Daniel Gillespie | Son | — | 26 | ~1914 |
| Elizabeth Gillespie | Daughter | — | 19 | ~1921 |
| Mary Gillespie | Daughter | — | 24 | ~1916 |
| Bridget Gillespie | Spouse | — | 59 | ~1881 |
| Daniel Gillespie | Head | — | 59 | ~1881 |
| Joseph Gillespie | Son | — | 17 | ~1923 |
| Thomas Gillespie | Son | — | 16 | ~1924 |
Census Appearances
1930
Cook, Illinois
Daughter, age 13
Cook, Illinois · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gillispie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 24
Cook-County, Illinois · implied b. ~1916 — 8 household members
| Surname | Gillespie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Occupation | File Clerk |
| Industry | Retail Ladies Clothing Store |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 936 |
| 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 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 24 · b. ~1916 · Illinois
★ You are viewing this record
Sibling
Peter Gillespie
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Gillespie
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Gillespie
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Gillespie
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Gillespie
Sibling · 1940 · age 19
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-t0627-00979-00045)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel J. Sr Gillespie | 59 | Head | Repairman | No Ireland |
| 2 | Bridget Gillespie | 59 | Wife | — | Eire |
| 3 | Daniel J. Jr Gillespie | 26 | Son | Conductor | Illinois |
| 4 | Mary Gillespie THIS PERSON | 24 | Daughter | File Clerk | Illinois |
| 5 | Peter Gillespie | 23 | Son | Salesman | Illinois |
| 6 | Elizabeth Gillespie | 19 | Daughter | New Worker | Illinois |
| 7 | Joseph Gillespie | 17 | Son | — | Illinois |
| 8 | Thomas Gillespie | 16 | Son | — | Illinois |
| 9 | Glenn P Benedict | 44 | Head | Mail Carrier | Michigan |
| 10 | Mae Benedict | 43 | Wife | — | Michigan |
| 11 | Berenice Benedict | 10 | Daughter | — | Illinois |
| 12 | Patrick J. Moran | 41 | Lodger | Meter Repairman | Eire |
| 13 | Catherine Moran | 41 | Lodger's wife | — | Eire |
| 14 | Mary Moran | 17 | Lodger's dau | — | Eire |
| 15 | John J. Moran | 11 | Lodger's son | — | Illinois |
| 16 | Hallen J. Clay | 31 | Head | Armature Dept Foreman | Virginia |
| 17 | Ruth Clay | 34 | Wife | — | Missouri |
| 18 | Dale Luxton | 23 | Lodger | Chef | Illinois |
| 19 | James Luxton | 21 | Lodger | Armature Tester | Indiana |
| 20 | Maude Nise | 52 | Lodger | Seamstress For Private Families | Missouri |
| 21 | John L. Spears | 41 | Head | Laborer | Iowa |
| 22 | Clara Spears | 40 | Wife | — | Iowa |
| 23 | Elmer Spears | 19 | Son | Counterman | Iowa |
| 24 | Pauline Spears | 16 | Daughter | New Worker | Iowa |
| 25 | Dorothy Spears | 14 | Daughter | — | Iowa |
| 26 | Don Spears | 12 | Son | — | Iowa |
| 27 | Jack Spears | 6 | Son | — | Illinois |
| 28 | Margaret Smith | 60 | Head | Pantry Work | Eire |
| 29 | William Smith | 19 | Son | Repairman | Illinois |
| 30 | Frank Smith | 24 | Son | Collector | Illinois |
| 31 | Carmella Smith | 23 | Daughter-in-law | — | Illinois |
| 32 | Barbara Jean Smith | 4 | Granddaughter | — | Illinois |
| 33 | Fillmore Burnell | 62 | Head | Maint. Machinist | South Carolina |
| 34 | Abbie Burnell | 39 | Wife | — | Missouri |
| 35 | Joseph Strelis | 51 | Head | Decorator Painter | Canada-English |
| 36 | Ella Strelis | 43 | Wife | Filing Clerk | Canada-English |
| 37 | Theodore Strelis | 19 | Son | — | Canada-English |
| 38 | Lawrence Buhlenkamp | 34 | Head | Salesman | Kansas |
| 39 | Margaret Buhlenkamp | 33 | Wife | — | Illinois |
| 40 | Edward Huffmeyer | 68 | Lodger | — | 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)