JG
John Gillespie — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Gillespie across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Charles & Hannah — first a head (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gillespie |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | City Fireman |
| Industry | Fire Dept |
| Class of Worker | GW |
| Hours Worked | 72 |
| Income (1939) | 2100 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | City Fireman |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Gillespie | Head | — | 32 | ~1908 |
| Margaret Gillespie | Spouse | — | 29 | ~1911 |
| John Gillespie | Son | — | 3 | ~1937 |
Census Appearances
1920
Cook, Illinois
Son, age 11
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gillespie |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Attends school |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gillespie |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Installer |
| Industry | Telegraph Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 32
Cook-County, Illinois · implied b. ~1908 — 3 household members
| Surname | Gillespie |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | City Fireman |
| Industry | Fire Dept |
| Class of Worker | GW |
| Hours Worked | 72 |
| Income (1939) | 2100 |
| Highest Grade | H 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 John Gillespie across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Gillespie (~0.92 confidence) and mother Hannah Gillespie (~0.92 confidence) and father Charles Gillespie (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Gillespie
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Hannah Gillespie
b. ~1875
Source mother
● Household
· direct · ~0.92
Father
Charles Gillespie
b. ~1880
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Gillespie
Head · 1940 · age 32 · b. ~1908 · 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-t0627-01002-00259)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Eleanor Kuschner | 26 | Wife | Clerk Typist | Illinois |
| 42 | Louis Price | 55 | Head | Storage Manager | Indiana |
| 43 | Jennie Price | 44 | Wife | — | Wisconsin |
| 44 | John Schurke | 35 | Head | Custodian | Illinois |
| 45 | Marie Schurke | 30 | Wife | Saleslady | Illinois |
| 46 | James Schurke | 10 | Son | — | Illinois |
| 47 | Marie Schurke | 10 | Daughter | — | Illinois |
| 48 | Yale Broden | 30 | Head | Insurance Clerk | Illinois |
| 49 | Hazel Broden | 30 | Wife | — | Illinois |
| 50 | Patricia Ann Broden | 2 | Daughter | — | Illinois |
| 51 | Arthur Olsen | 25 | Head | Electric Service | Illinois |
| 52 | Gertrude Olsen | 30 | Wife | — | Minnesota |
| 53 | Douglas Olsen | 1 | Son | — | Illinois |
| 54 | Joseph Stinn | 39 | Head | Auto Mechanic | Wisconsin |
| 55 | Marie Stinn | 38 | Wife | — | Illinois |
| 56 | Wayne Stinn | 9 | Son | — | Illinois |
| 57 | Dorothy Stinn | 6 | Daughter | — | Illinois |
| 58 | Clarence Wirtz | 28 | Head | Market Manager | Illinois |
| 59 | Eleanor Wirtz | 27 | Wife | — | Illinois |
| 60 | Ronald Wirtz | 6 | Son | — | Illinois |
| 61 | Mary Bentley | 46 | Mother in law | — | Illinois |
| 62 | John Gillespie THIS PERSON | 32 | Head | City Fireman | Illinois |
| 63 | Margaret Gillespie | 29 | Wife | — | Illinois |
| 64 | John Gillespie | 3 | Son | — | Illinois |
| 65 | Otto Mraz | 46 | Head | Book Binder | Austria |
| 66 | Herman Mraz | 34 | Wife | — | Austria |
| 67 | Otto Petz | 33 | Roomer | Machinist | Germany |
| 68 | Emil Wolf | 40 | Head | Machinist | Germany |
| 69 | Elizabeth Wolf | 37 | Wife | — | Germany |
| 70 | George Thompson | 64 | Head | Varnish Mixer | Norway |
| 71 | Cora Thompson | 53 | Wife | — | Illinois |
| 72 | George R. Thompson | 31 | Son | Testing Line | Illinois |
| 73 | Violet Thompson | 25 | Daughter in law | Saleslady | Illinois |
| 74 | Freda Loss | 42 | Head | — | Illinois |
| 75 | James Loss | 8 | Son | — | Illinois |
| 76 | Betty Jane Loss | 18 | Daughter | — | Illinois |
| 77 | Ronald Berry | 30 | Roomer | Salesman | Illinois |
| 78 | Raymond E. Smith | 34 | Head | Telephone Jumper | Ohio |
| 79 | Lillian Smith | 28 | Wife | — | Illinois |
| 80 | James Smith | 5 | Son | — | Illinois |
Pedigree Summary
John
Gen 1 · 3 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)