JC
John Callahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Garfield-County, Oklahoma
Our Model Tree links this John Callahan across the 1920, 1930 and 1940 US Censuses in Garfield-County, Oklahoma (XGBoost, ~Confirmed), with identified parents J & John — first a son (b.~1894), then head of a 3-person household.
Age 46
b. ~1894
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Garfield-County, Oklahoma |
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | McKinley Township |
| 1935 Residence (County) | Garfield |
| Additional Details | |
| Occupation | farmer |
| Industry | agriculture |
| Class of Worker | OA |
| Hours Worked | 45 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Farmer |
| Township / Ward | Mckinley Township |
| Est. Birth Year | ~1894 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Anna Callahan | Head | — | 76 | ~1864 |
| Harry Callahan | Son | — | 32 | ~1908 |
| John Callahan | Son | — | 46 | ~1894 |
Census Appearances
1920
Garfield, Oklahoma
Son, age 26
Garfield, Oklahoma · implied b. ~1894 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John T |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | England |
| Occupation | Laborer |
| Industry | Home Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Garfield, Oklahoma
Son, age 36
Garfield, Oklahoma · implied b. ~1894 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | England |
| Occupation | Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Garfield-County, Oklahoma
Son, age 46
Garfield-County, Oklahoma · implied b. ~1894 — 3 household members
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | McKinley Township |
| 1935 Residence (County) | Garfield |
| Occupation | farmer |
| Industry | agriculture |
| Class of Worker | OA |
| Hours Worked | 45 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 J Callahan (~0.92 confidence) and father John Callahan (~0.92 confidence) and mother Annie Callahan (~0.92 confidence) and mother Alice Callahan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
J Callahan
b. ~1854
Source father
● Household
· direct · ~0.92
Father
John Callahan
b. ~1855
Source father
● Household
· direct · ~0.92
Mother
Annie Callahan
b. ~1864
Source mother
● Household
· direct · ~0.92
Mother
Alice Callahan
b. ~1865
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Callahan
Son · 1940 · age 46 · b. ~1894 · Oklahoma
★ You are viewing this record
Sibling
Harry Callahan
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 — Garfield-County, Oklahoma
Open full size
1940 US Federal Census — Garfield-County, Oklahoma
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03293-00359)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arch B. Crandall | 56 | Head | Watchman | Missouri |
| 2 | Polly L. Crandall | 56 | Wife | — | Nebraska |
| 3 | Katherine R. Crandall | 12 | Daughter | — | Oklahoma |
| 4 | Anna Callahan | 76 | Head | — | England |
| 5 | John Callahan THIS PERSON | 46 | Son | Farmer | Missouri |
| 6 | Harry Callahan | 32 | Son | Farmer | Oklahoma |
| 7 | Samuel A. Schultz | 53 | Head | Farmer | Kansas |
| 8 | Mollie A. Schultz | 52 | Wife | — | Kansas |
| 9 | A. B. Mcneil | 44 | Head | Farmer | Nebraska |
| 10 | Isabella H. Mcneil | 72 | Mother | — | New Brunswick |
| 11 | E. J. Brown | 38 | Cousin | Farmer | Nebraska |
| 12 | F. G. Posey | 36 | Head | Farmer | Oklahoma |
| 13 | Margarete Posey | 30 | Wife | — | Oklahoma |
| 14 | Willis D. Posey | 10 | Son | — | Oklahoma |
| 15 | John Widel | 54 | Head | Laborer | Kansas |
| 16 | Rachel Widel | 53 | Wife | — | Kansas |
| 17 | Harry Widel | 18 | Son | New Worker | Oklahoma |
| 18 | Clerance Widel | 16 | Son | — | Oklahoma |
| 19 | Tinnie Malinda Widel | 12 | Daughter | — | Oklahoma |
| 20 | Nelda Jean Widel | 7 | Daughter | — | Oklahoma |
| 21 | Dwain E. Fellows | 37 | Head | Carpenter | Illinois |
| 22 | Grace Fellows | 38 | Wife | — | Kansas |
| 23 | D. W. White | 52 | Head | Farmer | Missouri |
| 24 | Myrtle V. White | 51 | Wife | — | Kentucky |
| 25 | Roy D. White | 19 | Son | Farmer | Oklahoma |
| 26 | Velma White | 17 | Daughter | — | Oklahoma |
| 27 | Jacob Schultz | 58 | Head | Farmer | Kansas |
| 28 | Louise Schultz | 56 | Wife | — | Russia |
| 29 | James Arvil Campbell | 48 | Head | Farmer | Kansas |
| 30 | Etta Lea Campbell | 47 | Wife | — | Kansas |
| 31 | Delbert Lee Campbell | 18 | Son | — | Oklahoma |
| 32 | Safe Monroe Campbell | 14 | Son | — | Oklahoma |
| 33 | L. A. Nelson | 40 | Head | Distiller | Oklahoma |
| 34 | Florence Nelson | 36 | Wife | — | Oklahoma |
| 35 | Evelyn Nelson | 16 | Daughter | — | Oklahoma |
| 36 | Murl Nelson | 15 | Son | — | Oklahoma |
| 37 | George Nelson | 9 | Son | — | Oklahoma |
| 38 | Kenneth Nelson | 9 | Son | — | Oklahoma |
| 39 | Wanda Rose Nelson | 7 | Daughter | — | Oklahoma |
| 40 | Ada Dunham | 57 | Mother | — | Kansas |
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)