WC
William Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jersey-County, Illinois
Our Model Tree links this William Callahan across the 1930 and 1940 US Censuses in Jersey-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jersey-County, Illinois |
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Grafton City |
| 1935 Residence (County) | Jersey |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Grafton City |
| Est. Birth Year | ~1923 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Patrick Callahan | Son | — | 1 | ~1939 |
| John Callahan | Son | — | 3 | ~1937 |
| Dennis Callahan | Son | — | 15 | ~1925 |
| William Callahan | Son | — | 17 | ~1923 |
| Donald Callahan | Son | — | 14 | ~1926 |
| Garnet Callahan | Spouse | — | 23 | ~1917 |
| William Callahan | Head | — | 48 | ~1892 |
| Ellen Callahan | Daughter | — | 5 | ~1935 |
Census Appearances
1930
Jersey, Illinois
Son, age 7
Jersey, Illinois · implied b. ~1923 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | William M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| 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
Jersey-County, Illinois
Son, age 17
Jersey-County, Illinois · implied b. ~1923 — 8 household members
| Surname | Callahan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Grafton City |
| 1935 Residence (County) | Jersey |
| Highest Grade | H 1 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Callahan
Son · 1940 · age 17 · b. ~1923 · Illinois
★ You are viewing this record
Sibling
Patrick Callahan
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Callahan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Callahan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Callahan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Callahan
Sibling · 1940 · age 3
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 — Jersey-County, Illinois
Open full size
1940 US Federal Census — Jersey-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00817-00309)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Callahan | 48 | Head | Electrician | Illinois |
| 2 | Garnet Callahan | 23 | Wife | — | Illinois |
| 3 | William Callahan THIS PERSON | 17 | Son | — | Illinois |
| 4 | Dennis Callahan | 15 | Son | — | Illinois |
| 5 | Donald Callahan | 14 | Son | — | Illinois |
| 6 | Ellen Callahan | 5 | Daughter | — | Illinois |
| 7 | John Callahan | 3 | Son | — | Illinois |
| 8 | Patrick Callahan | 1 | Son | — | Illinois |
| 9 | George Martin | 36 | Head | Powder Packer | Illinois |
| 10 | Katherine Martin | 27 | Wife | Salesman | Kentucky |
| 11 | Lawrence Pohlman | 59 | Head | Nitro Glycerine Maker | Illinois |
| 12 | Anna Pohlman | 55 | Wife | — | Illinois |
| 13 | Theodore Feldcamp | 46 | Boarder | Kitchen Man | Illinois |
| 14 | Fred Clark | 34 | Head | Truck Driver | Illinois |
| 15 | Mildred Clark | 23 | Wife | — | Illinois |
| 16 | Ola Ennis | 59 | Head | — | Illinois |
| 17 | Edward Ennis | 19 | Son | Laborer | Illinois |
| 18 | Kenneth Fenton | 3 | Grandson | — | Illinois |
| 19 | Herbert Ennis | 28 | Head | Laborer | Illinois |
| 20 | Clara Ennis | 25 | Wife | — | Illinois |
| 21 | Herbert Jr. Ennis | 6 | Son | — | Illinois |
| 22 | Thelma Ennis | 4 | Daughter | — | Illinois |
| 23 | Kenneth Ennis | 2 | Son | — | Illinois |
| 24 | Mable Mccann | 58 | Head | — | Illinois |
| 25 | Vera Mccann | 16 | Daughter | — | Illinois |
| 26 | Roy Mccann | 4 | Son | — | Illinois |
| 27 | Frank Miller | 64 | Head | Laborer | Illinois |
| 28 | Flora Miller | 63 | Wife | — | Illinois |
| 29 | Archie Miller | 23 | Son | Shell Maker | Illinois |
| 30 | Francis Irwin | 48 | Head | Glycerine Maker | Missouri |
| 31 | Harriett Irwin | 49 | Wife | — | Missouri |
| 32 | Edna Irwin | 29 | Daughter | — | Missouri |
| 33 | Robert Irwin | 27 | Son | Attendant | Missouri |
| 34 | Merlin Irwin | 23 | Son | Attendant | Missouri |
| 35 | Lucille Irwin | 13 | Daughter | — | Missouri |
| 36 | Frank Watson | 43 | Head | Laborer | Illinois |
| 37 | Bonita Watson | 36 | Wife | — | Illinois |
| 38 | Alice P. Watson | 15 | Daughter | — | Illinois |
| 39 | Anna Bell Watson | 12 | Daughter | — | Illinois |
| 40 | Harold Watson | 10 | Son | — | Illinois |
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)