JK
John Keefe — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Keefe across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1904), then head of a 8-person household.
Age 36
b. ~1904
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Office Clerk |
| Industry | Rubber Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Office Clerk |
| Township / Ward | Chicago |
| Est. Birth Year | ~1904 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Mary Keefe | Daughter | — | 31 | ~1909 |
| Jeanne Keefe | Daughter | — | 21 | ~1919 |
| Susan Keefe | Head | — | 65 | ~1875 |
| David Keefe | Son | — | 37 | ~1903 |
| Gerald Keefe | Son | — | 32 | ~1908 |
| John Keefe | Son | — | 36 | ~1904 |
| Margaret Keefe | Daughter | — | 39 | ~1901 |
| Helen Keefe | Daughter | — | 34 | ~1906 |
Census Appearances
1930
Cook, Illinois
Son, age 22
Cook, Illinois · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Office Work |
| Industry | Electric Appliances |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 36
Cook-County, Illinois · implied b. ~1904 — 8 household members
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Office Clerk |
| Industry | Rubber Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 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 Keefe across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Keefe
Son · 1940 · age 36 · b. ~1904 · Illinois
★ You are viewing this record
Sibling
Margaret Keefe
Sibling · 1940 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Keefe
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jeanne Keefe
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Keefe
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Keefe
Sibling · 1940 · age 37
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Keefe
Sibling · 1940 · age 32
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-t0627-00958-00808)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Hurley | 17 | Son | — | Michigan |
| 2 | — | None | — | — | — |
| 3 | — | None | — | — | — |
| 4 | Susan Keefe | 65 | Head | — | Indiana |
| 5 | Margaret Keefe | 39 | Daughter | Nurse | Illinois |
| 6 | David Keefe | 37 | Son | Chauffeur | Illinois |
| 7 | John Keefe THIS PERSON | 36 | Son | Office Clerk | Illinois |
| 8 | Helen Keefe | 34 | Daughter | Stenographer | Illinois |
| 9 | Gerald Keefe | 32 | Son | Policeman | Illinois |
| 10 | Mary Keefe | 31 | Daughter | Stenographer | Illinois |
| 11 | Jeanne Keefe | 21 | Daughter | Stenographer | Illinois |
| 12 | Leo Kornfeld | 49 | Head | Secretary | Illinois |
| 13 | Sadie Kornfeld | 45 | Wife | — | Indiana |
| 14 | Jack Kornfeld | 23 | Son | — | Illinois |
| 15 | Marjorie Kornfeld | 20 | Daughter | Secretary | Illinois |
| 16 | Babel Kornfeld | 77 | Father | — | France |
| 17 | Herbert Anderson | 41 | Head | Sales Supervisor | Illinois |
| 18 | Edna Anderson | 39 | Wife | — | Indiana |
| 19 | Carl Anderson | 19 | Son | — | Indiana |
| 20 | Robert Anderson | 12 | Son | — | Indiana |
| 21 | William Anderson | 4 | Son | — | Ohio |
| 22 | Sharon Anderson | 0 | Daughter | — | Illinois |
| 23 | Harry Ryan | 48 | Head | Maintenance Man | Iowa |
| 24 | Effie Ryan | 46 | Wife | — | Ohio |
| 25 | Donald Ryan | 18 | Son | — | Illinois |
| 26 | Edward Gradl | 36 | Head | Electrician | Illinois |
| 27 | Ethel K Gradl | 35 | Wife | Bookkeeper | Illinois |
| 28 | Jack D Gradl | 14 | Son | — | Illinois |
| 29 | Raymond Schofield | 45 | Head | Manager | Illinois |
| 30 | Alice Schofield | 42 | Wife | — | Illinois |
| 31 | Joseph Schofield | 14 | Son | — | Illinois |
| 32 | Mary Ellen Schofield | 12 | Daughter | — | Illinois |
| 33 | Daniel Schofield | 10 | Son | — | Illinois |
| 34 | John R Schofield | 9 | Son | — | Illinois |
| 35 | Raymond Schofield | 8 | Son | — | Illinois |
| 36 | Michael Schofield | 6 | Son | — | Illinois |
| 37 | Geraldine Schofield | 4 | Daughter | — | Illinois |
| 38 | Eileen Ryan | 40 | Head | Secretary | Illinois |
| 39 | Mary Ryan | 35 | Sister | Secretary | Illinois |
| 40 | Frederick Edwards | 46 | Head | Contractor | Illinois |
Related Census Records
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)