WG
William Gillespie — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Gillespie across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 6-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gillespie |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Dan Gillespie | Son | — | 7 | ~1933 |
| John Gillespie | Head | — | 46 | ~1894 |
| John Gillespie | Son | — | 12 | ~1928 |
| Thomas Gillespie | Son | — | 4 | ~1936 |
| Ann Gillespie | Spouse | — | 43 | ~1897 |
| William Gillespie | Son | — | 15 | ~1925 |
Census Appearances
1930
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1930 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gillespie |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 15
Cook-County, Illinois · implied b. ~1925 — 6 household members
| Surname | Gillespie |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | H 2 |
| 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 William Gillespie across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Gillespie
Son · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Dan Gillespie
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Gillespie
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Gillespie
Sibling · 1940 · age 12
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-t0627-00999-00338)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Henry Barrow | 72 | Head | Retired Postal Clerk | Illinois |
| 42 | Edward Mott | 36 | Head | Candy Maker | Illinois |
| 43 | Katherine Mott | 29 | Wife | — | Illinois |
| 44 | Norman Mott | 7 | Son | — | Illinois |
| 45 | Bernadine Mott | 1 | Daughter | — | Illinois |
| 46 | John Gillespie | 46 | Head | Police Off | Ireland |
| 47 | Ann Gillespie | 43 | Wife | — | Ireland |
| 48 | William Gillespie THIS PERSON | 15 | Son | — | Illinois |
| 49 | John Gillespie | 12 | Son | — | Illinois |
| 50 | Dan Gillespie | 7 | Son | — | Illinois |
| 51 | Thomas Gillespie | 4 | Son | — | Illinois |
| 52 | Fred Schellin | 47 | Head | Supt. Printing Shop | Illinois |
| 53 | Frances Schellin | 45 | Wife | — | Illinois |
| 54 | William Schellin | 18 | Son | New Worker | Illinois |
| 55 | Marilyn Schellin | 12 | Daughter | — | Illinois |
| 56 | Victor Johanson | 74 | Head | Painter | Sweden |
| 57 | Anna Johanson | 47 | Wife | — | Sweden |
| 58 | Louis Steinbacher | 73 | Head | — | Illinois |
| 59 | Tillie Steinbacher | 68 | Wife | — | Illinois |
| 60 | Leonard Lindberg | 48 | Head | Driver - Milk | Sweden |
| 61 | Anna Lindberg | 47 | Wife | — | Sweden |
| 62 | Robert Lindberg | 15 | Son | — | Illinois |
| 63 | Eric Hedlin | 42 | Head | Owner | Illinois |
| 64 | Heather Hedlin | 42 | Wife | — | Sweden |
| 65 | Eugene Hedlin | 17 | Son | — | Illinois |
| 66 | Edwin Hedlin | 15 | Son | — | Illinois |
| 67 | Victor Carlson | 40 | Cousin | Carpenter | Sweden |
| 68 | Esther Carlson | 45 | Cousin | — | Sweden |
| 69 | Mildred Carlson | 15 | Cousin | — | Illinois |
| 70 | Frank Lewereny | 33 | Head | Layer-Leaf | Illinois |
| 71 | Marie Lewereny | 34 | Wife | — | Illinois |
| 72 | Richard Hitzemann | 39 | Head | Driver | Illinois |
| 73 | Mary Hitzemann | 35 | Wife | — | New Jersey |
| 74 | Martha Hitzemann | 13 | Daughter | — | Illinois |
| 75 | Patrick Hennelly | 44 | Head | Baggage | Ireland |
| 76 | Katherine Hennelly | 53 | Wife | — | Ireland |
| 77 | Joseph Zavadsky | 45 | Head | Machinist | Czecho |
| 78 | Sophie Zavadsky | 42 | Wife | — | Czecho |
| 79 | Otto Zavadsky | 19 | 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)