JG
John Gallagher — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Gallagher across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Mary & Francis — first a son (b.~1918), then head of a 6-person household.
Age 22
b. ~1918
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Gallagher |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | S |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1918 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Mary Gallagher | Daughter | — | 18 | ~1922 |
| Francis Gallagher | Head | — | 40 | ~1900 |
| John Gallagher | Son | — | 22 | ~1918 |
| Francis Gallagher | Son | — | 19 | ~1921 |
| Michael Gallagher | Son | — | 20 | ~1920 |
| Annie Gallagher | Spouse | — | 38 | ~1902 |
Census Appearances
1920
Cook, Illinois
Son, age 2
Cook, Illinois · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gallagher |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gallagher |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 22
Cook-County, Illinois · implied b. ~1918 — 6 household members
| Surname | Gallagher |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Industry | S |
| Class of Worker | 0 |
| 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 Gallagher across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Gallagher (~0.92 confidence) and father Francis Gallagher (~0.92 confidence) and mother Anna Gallagher (~0.92 confidence) and father Francis Gallagher (~0.92 confidence) and mother Annie Gallagher (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Gallagher
b. ~1890
Source mother
● Household
· direct · ~0.92
Father
Francis Gallagher
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Anna Gallagher
b. ~1896
Source mother
● Household
· direct · ~0.92
Father
Francis Gallagher
b. ~1900
Source father
● Household
· direct · ~0.92
Mother
Annie Gallagher
b. ~1902
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Gallagher
Son · 1940 · age 22 · b. ~1918 · Illinois
★ You are viewing this record
Sibling
Michael Gallagher
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Gallagher
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Gallagher
Sibling · 1940 · age 18
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-t0627-01016-00435)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Emma Black | 60 | Head | — | Sweden |
| 42 | Joyce Black | 22 | Daughter | Secretary | Illinois |
| 43 | Guy Logan | 28 | Head | Service Clerk | Illinois |
| 44 | Ardelle Logan | 25 | Wife | — | Illinois |
| 45 | Jill Logan | 3 | Daughter | — | Illinois |
| 46 | Guy Iii Logan | 1 | Son | — | Illinois |
| 47 | Black | 0 | Son | — | Illinois |
| 48 | Patrick Heane | 43 | Head | Conductor | Irish Free State |
| 49 | Ellen Heane | 36 | Wife | — | Irish Free State |
| 50 | Patricia Heane | 7 | Daughter | — | Illinois |
| 51 | Martin Heane | 1 | Son | — | Illinois |
| 52 | George Monjan | 50 | Head | Salesman | Hungary |
| 53 | Rose Monjan | 47 | Wife | — | Illinois |
| 54 | Frank Schmidt | 37 | Head | Painter | Illinois |
| 55 | Pauline Schmidt | 67 | Mother-in-law | — | Germany |
| 56 | Leslie Ross | 36 | Head | Distributor | Illinois |
| 57 | Evelyn Ross | 25 | Wife | — | Illinois |
| 58 | Diane Ross | 1 | Daughter | — | Illinois |
| 59 | Otto Beirwirth | 28 | Lodger | Radio Tester | Germany |
| 60 | Lorraine Beirwirth | 18 | Sister-in-law | — | Illinois |
| 61 | Albert Lamb | 56 | Head | Machinist | Illinois |
| 62 | Minna Lamb | 55 | Wife | — | Illinois |
| 63 | Frank Struck | 40 | Head | Motorman | Illinois |
| 64 | Viola Struck | 36 | Wife | — | Minnesota |
| 65 | Frank Jr. Struck | 15 | Son | — | Minnesota |
| 66 | Francis Gallagher | 40 | Head | Policeman | Irish Free State |
| 67 | Annie Gallagher | 38 | Wife | — | Irish Free State |
| 68 | John Gallagher THIS PERSON | 22 | Son | — | Illinois |
| 69 | Michael Gallagher | 20 | Son | New Worker | Illinois |
| 70 | Francis Jr. Gallagher | 19 | Son | New Worker | Illinois |
| 71 | Mary Gallagher | 18 | Daughter | New Worker | Illinois |
| 72 | Max Scherer | 54 | Head | Proprietor | New York |
| 73 | Theresa Scherer | 52 | Wife | — | Illinois |
| 74 | Alfred Habich | 28 | Head | Furrier | Illinois |
| 75 | Viola Habich | 30 | Wife | — | Illinois |
| 76 | Richard Habich | 1 | Son | — | Illinois |
| 77 | Walter O'Neill | 57 | Head | Foreman | Illinois |
| 78 | Lillie O'Neill | 55 | Wife | — | Illinois |
| 79 | Walter Jr. O'Neill | 23 | Son | Clerk Office | Illinois |
| 80 | Walter Meyer | 43 | Head | Stock Clerk | Illinois |
Related Census Records
Pedigree Summary
John + 3 siblings
Gen 1 · 5 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)