WC
William Callahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Callahan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Sadie & William — first a son (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Callahan |
| Given Name | William Jr. |
| 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 | |
| Occupation | File Clerk |
| Industry | Mail Order House |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | File Clerk |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Callahan | Son | — | 22 | ~1918 |
| William Callahan | Head | — | 54 | ~1886 |
| Sadie Callahan | Spouse | — | 54 | ~1886 |
Census Appearances
1920
Cook, Illinois
Son, age 2
Cook, Illinois · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | William J Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| 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 — 3 household members
| Surname | Callahan |
| Given Name | William Jr. |
| 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 |
| Occupation | File Clerk |
| Industry | Mail Order House |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| 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 William Callahan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Sadie Callahan (~0.92 confidence) and father William Callahan (~0.92 confidence) and father William Callahan (~0.92 confidence) and mother Christina Callahan (~0.92 confidence) and mother Ella Callahan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Sadie Callahan
b. ~1886
Source mother
● Household
· direct · ~0.92
Father
William Callahan
b. ~1886
Source father
● Household
· direct · ~0.92
Father
William Callahan
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Christina Callahan
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Ella Callahan
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Callahan
Son · 1940 · age 22 · b. ~1918 · 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
39 people indexed on this census page (nara:1940:m-t0627-00978-00646)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Plumtree | 60 | Head | — | Illinois |
| 2 | James Cochammer | 34 | Head | Proprietor | Greece |
| 3 | Angello Cochammer | 29 | Wife | — | Michigan |
| 4 | Fileeda Cochammer | 10 | Daughter | — | Illinois |
| 5 | John Cochammer | 5 | Son | — | Illinois |
| 7 | Teressa Penney | 41 | Head | Admin. Organz. | Illinois |
| 8 | Elizabeth Penney | 32 | Wife | — | Illinois |
| 9 | Julie Sue Penney | 11 | Daughter | — | Illinois |
| 10 | Katherine Hazlett | 75 | Head | — | Illinois |
| 11 | Bessie Hazlett | 42 | Daughter | Typist | Illinois |
| 12 | Meyer Cassman | 76 | Head | — | Illinois |
| 13 | Moses Cassman | 80 | Brother | Bookkeeper | Illinois |
| 14 | Florence Cassman | 79 | Sister | — | Illinois |
| 15 | Edith Suartz | 71 | Sister | — | Illinois |
| 16 | Ralph Adley | 25 | Head | Shipping Clerk | Illinois |
| 17 | Jean Adley | 25 | Wife | — | Michigan |
| 18 | William Callahan | 54 | Head | Officer | Illinois |
| 19 | Sadie Callahan | 54 | Wife | — | Illinois |
| 20 | William Jr. Callahan THIS PERSON | 22 | Son | File Clerk | Illinois |
| 21 | Samuel Foreman | 56 | Head | Manager | Russia |
| 22 | Bessie Foreman | 42 | Wife | — | Illinois |
| 23 | James Mcmeekin | 32 | Head | House Man | Illinois |
| 24 | Vivian Mcmeekin | 27 | Wife | Operator | Illinois |
| 25 | Robert Mcmeekin | 6 | Son | — | Illinois |
| 26 | John Nikolai | 52 | Head | Janitor | Poland |
| 27 | Helen Nikolai | 19 | Daughter | Housework | Illinois |
| 28 | Elga Nikolai | 18 | Daughter | — | Illinois |
| 29 | Charles Triplett | 24 | Head | Claim Report | Iowa |
| 30 | Koba Triplett | 25 | Wife | — | Iowa |
| 31 | Alfred Lennon | 50 | Head | Proprietor | Russia |
| 32 | Esther Lennon | 46 | Wife | Cook | Austria |
| 33 | Loraine Lennon | 20 | Daughter | — | Illinois |
| 34 | Helen Meyers | 35 | Sister-in-law | — | Austria |
| 35 | Thomas Tansey | 51 | Head | Lawyer | Canada Eng |
| 36 | Enid Tansey | 52 | Wife | — | Illinois |
| 37 | George Travis | 50 | Head | Mortician | Illinois |
| 38 | Enid Travis | 48 | Wife | — | Illinois |
| 39 | Francis Moran | 60 | Head | Lawyer | Illinois |
| 40 | Laura Moran | 61 | Wife | — | Michigan |
Pedigree Summary
William
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)