JC
John Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Callahan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 13-person household.
Age 18
b. ~1922
Male
Son
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Maywood Village |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Maywood Village |
| Est. Birth Year | ~1922 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Callahan | Daughter | — | 13 | ~1927 |
| Patricia Callahan | Daughter | — | 11 | ~1929 |
| Betty Callahan | Daughter | — | 9 | ~1931 |
| Anna Callahan | Daughter | — | 19 | ~1921 |
| John Callahan | Head | — | 51 | ~1889 |
| Katherine Bochum | Other | — | 59 | ~1881 |
| James Callahan | Son | — | 16 | ~1924 |
| John Callahan | Son | — | 18 | ~1922 |
| Robert Callahan | Son | — | 15 | ~1925 |
| Bernard Callahan | Son | — | 7 | ~1933 |
| Dennis Callahan | Son | — | 4 | ~1936 |
| William Callahan | Son | — | 18 | ~1922 |
| Agnes Callahan | Spouse | — | 44 | ~1896 |
Census Appearances
1930
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Cook-County, Illinois
Son, age 18
Cook-County, Illinois · implied b. ~1922 — 13 household members
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Maywood Village |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Callahan
Son · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
James Callahan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Callahan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Callahan
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Callahan
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Callahan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Callahan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Callahan
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Callahan
Sibling · 1940 · age 9
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-t0627-00787-00740)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Hanson | 12 | Son | — | Illinois |
| 2 | Aquella Hanson | 41 | Head | — | Illinois |
| 3 | John Callahan | 51 | Head | Highway Patrolman | Wisconsin |
| 4 | Agnes Callahan | 44 | Wife | — | Illinois |
| 5 | Anna Mary Callahan | 19 | Daughter | — | Illinois |
| 6 | William Callahan | 18 | Son | — | Michigan |
| 7 | John Callahan THIS PERSON | 18 | Son | — | Michigan |
| 8 | James Callahan | 16 | Son | — | Michigan |
| 9 | Robert Callahan | 15 | Son | — | Michigan |
| 10 | Margaret Callahan | 13 | Daughter | — | Michigan |
| 11 | Patricia Callahan | 11 | Daughter | — | Illinois |
| 12 | Betty Callahan | 9 | Daughter | — | Illinois |
| 13 | Bernard Callahan | 7 | Son | — | Illinois |
| 14 | Dennis Callahan | 4 | Son | — | Illinois |
| 15 | Katherine Bochum | 59 | Sister | Nurse | Wisconsin |
| 16 | James Peterson | 24 | Head | Proprietor | Michigan |
| 17 | Avis Peterson | 58 | Mother | — | Indiana |
| 18 | Ruth Peterson | 22 | Sister | Biller | Michigan |
| 19 | Richard Peterson | 17 | Brother | — | Michigan |
| 20 | Frank Zboray | 38 | Head | Postal Clerk | New Jersey |
| 21 | Ann Zboray | 33 | Wife | — | New Jersey |
| 22 | Florence Zboray | 14 | Daughter | — | Illinois |
| 23 | Charles Munkers | 44 | Head | Salesman | Illinois |
| 24 | Edna Munkers | 39 | Wife | — | Illinois |
| 25 | Patricia Lou Munkers | 13 | Daughter | — | Illinois |
| 26 | Frederick C. Munkers | 51 | Brother | Labor | Illinois |
| 27 | Dina Bergerson | 36 | Head | Storekeeper | Illinois |
| 28 | Etta Bergerson | 40 | Wife | — | Illinois |
| 29 | Waldemar L. Paulsen | 42 | Head | Engineer | Denmark |
| 30 | Elvera M. Paulsen | 42 | Wife | — | Denmark |
| 31 | James F. Dolan | 59 | Head | Machine Oiler | Illinois |
| 32 | Margaret A. Dolan | 55 | Wife | — | Michigan |
| 33 | Sharlene Dolan | 21 | Daughter | Junior Clerk | Illinois |
| 34 | George Dolan | 27 | Son | Salesman | Illinois |
| 35 | Walter Amling | 47 | Head | — | Wisconsin |
| 36 | Martha Amling | 45 | Wife | — | Ohio |
| 37 | Hollie Amling | 22 | Daughter | — | Illinois |
| 38 | Aline Amling | 19 | Daughter | — | Illinois |
| 39 | John Amling | 15 | Son | — | Illinois |
| 40 | Carrie Van Pelt | 64 | Head | — | 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)