JC
John Callahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Knox-County, Kentucky
Our Model Tree links this John Callahan across the 1920, 1930 and 1940 US Censuses in Knox-County, Kentucky (XGBoost, ~Confirmed), with identified parents James & William — first a son (b.~1907), then head of a 4-person household.
Age 33
b. ~1907
Male
Son
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Kentucky |
| Surname | Callahan |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Magisterial District 1 |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Laborer |
| Township / Ward | Magisterial District 1 |
| Est. Birth Year | ~1907 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Ester Townsley | Daughter | — | 16 | ~1924 |
| W Callahan | Head | — | 75 | ~1865 |
| John Callahan | Son | — | 33 | ~1907 |
| Lucinia Callahan | Spouse | — | 75 | ~1865 |
Census Appearances
1920
Knox, Kentucky
Son, age 13
Knox, Kentucky · implied b. ~1907 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callihan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Kentucky |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Knox, Kentucky
Son, age 22
Knox, Kentucky · implied b. ~1908 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callihan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Kentucky |
| Occupation | Laborer |
| Industry | Road build |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Knox-County, Kentucky
Son, age 33
Knox-County, Kentucky · implied b. ~1907 — 4 household members
| Surname | Callahan |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Magisterial District 1 |
| 1935 Residence (County) | Knox |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Callihan (~0.92 confidence) and father William Callihan (~0.92 confidence) and mother Lucinda Callihan (~0.92 confidence) and father W Callahan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Callihan
b. ~1862
Source father
● Household
· direct · ~0.92
Father
William Callihan
b. ~1862
Source father
● Household
· direct · ~0.92
Mother
Lucinda Callihan
b. ~1864
Source mother
● Household
· direct · ~0.92
Father
W Callahan
b. ~1865
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Callahan
Son · 1940 · age 33 · b. ~1907 · Kentucky
★ You are viewing this record
Sibling
Ester Townsley
Sibling · 1940 · age 16
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 — Knox-County, Kentucky
Open full size
1940 US Federal Census — Knox-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01326-00701)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Delbert Huddleston | 73 | Lodger | — | Kentucky |
| 2 | W. E. Callahan | 75 | Head | Farmer | Tennessee |
| 3 | Lucinia Callahan | 75 | Wife | — | Kentucky |
| 4 | John A. Callahan THIS PERSON | 33 | Son | Laborer | Kentucky |
| 5 | Ester Townsley | 16 | Daughter | — | Kentucky |
| 6 | D. J. Lawson | 42 | Head | Miner | Kentucky |
| 7 | Mamie D. Lawson | 37 | Wife | — | Virginia |
| 8 | William H. Lawson | 19 | Son | — | Kentucky |
| 9 | Odis Jr. Lawson | 14 | Son | — | Kentucky |
| 10 | Betty J. Lawson | 9 | Daughter | — | Kentucky |
| 11 | Jewel D. Lawson | 5 | Daughter | — | Kentucky |
| 12 | Luther Helton | 37 | Head | Laborer | Kentucky |
| 13 | Iola Helton | 33 | Wife | — | Kentucky |
| 14 | Charles Fulty | 58 | Head | Miner | Kentucky |
| 15 | Laura P. Fulty | 58 | Wife | — | Kentucky |
| 16 | Ruth Fulty | 18 | Daughter | New Worker | Kentucky |
| 17 | James L. Mills | 45 | Head | Truck Driver | Kentucky |
| 18 | Marie S. Mills | 38 | Wife | — | Kentucky |
| 19 | Everett Mills | 15 | Son | New Worker | Kentucky |
| 20 | James, Jr. Mills | 6 | Son | — | Kentucky |
| 21 | James Farris | 19 | Lodger | New Worker | Kentucky |
| 22 | James Patterson | 26 | Head | Taxi Driver | Kentucky |
| 23 | Clarcia Patterson | 20 | Wife | Saleslady | Kentucky |
| 24 | Gillard Hammons | 26 | Head | Proprietor | Kentucky |
| 25 | Mahala Hammons | 70 | Mother | — | Kentucky |
| 26 | Robert Johnson | 57 | Head | — | North Carolina |
| 27 | Leda Johnson | 51 | Wife | — | Tennessee |
| 28 | Flora M. Johnson | 19 | Daughter | — | Kentucky |
| 29 | Charles A. Johnson | 11 | Son | — | Kentucky |
| 30 | H. E. Paxton | 41 | Head | School Teacher | Kentucky |
| 31 | Edna Paxton | 25 | Wife | — | Kentucky |
| 32 | Charles Sizemore | 43 | Head | Farmer | Kentucky |
| 33 | Minnie Sizemore | 39 | Wife | — | Kentucky |
| 34 | Chester Sizemore | 19 | Son | New Worker | Kentucky |
| 35 | Mary Sizemore | 17 | Daughter | — | Kentucky |
| 36 | Ethel Sizemore | 14 | Daughter | — | Kentucky |
| 37 | Clyde Sizemore | 9 | Son | — | Kentucky |
| 38 | Amanda L. Sizemore | 7 | Daughter | — | Kentucky |
| 39 | Geneva Sizemore | 5 | Daughter | — | Kentucky |
| 40 | Tasson Yeager | 59 | Head | Farmer | Kentucky |
Pedigree Summary
John + 1 sibling
Gen 1 · 4 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)