JC
John Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allen-County, Ohio
Our Model Tree links this John Callahan across the 1920, 1930 and 1940 US Censuses in Allen-County, Ohio (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 6-person household.
Age 59
b. ~1881
Male
Head
Born: Ohio
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allen-County, Ohio |
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Lima City |
| 1935 Residence (County) | Allen |
| Additional Details | |
| Occupation | Boilermaker Helper |
| Industry | Steam engine mfg |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Boilermaker Helper |
| Township / Ward | Lima City |
| Est. Birth Year | ~1881 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Callahan | Head | — | 59 | ~1881 |
| Cecil Callahan | Other | — | 31 | ~1909 |
| Betty Davis | Other | — | 12 | ~1928 |
| Herbert Callahan | Son | — | 35 | ~1905 |
| Robert Callahan | Son | — | 27 | ~1913 |
| Grace Callahan | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Allen, Ohio
Head, age 39
Allen, Ohio · implied b. ~1881 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | New York |
| Occupation | Asst. Postmaster |
| Industry | Post Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Allen, Ohio
Head, age 49
Allen, Ohio · implied b. ~1881 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John E |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | New York |
| Occupation | Clerk |
| Industry | Locomotive Purchasing Dept |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 5,000 |
| Radio Set | R |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Allen-County, Ohio
Head, age 59
Allen-County, Ohio · implied b. ~1881 — 6 household members
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Lima City |
| 1935 Residence (County) | Allen |
| Occupation | Boilermaker Helper |
| Industry | Steam engine mfg |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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.
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This person
Anchor record
John Callahan
Head · 1940 · age 59 · b. ~1881 · Ohio
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Allen-County, Ohio
Open full size
1940 US Federal Census — Allen-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03020-00753)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donnie Stoneburner | 5 | Son | — | Ohio |
| 2 | Audrey Stoneburner | 2 | Daughter | — | Ohio |
| 3 | Elizabeth Breneman | 76 | Head | — | Ohio |
| 4 | Edward Breneman | 40 | Son | Asst Accountant | Ohio |
| 5 | Andrew Brown | 72 | Head | — | England |
| 6 | Margaret Brown | 68 | Wife | — | Ohio |
| 7 | Fred Schroeder | 57 | Head | Salesman | Ohio |
| 8 | Helene Schroeder | 53 | Wife | — | Ohio |
| 9 | Mary Schroeder | 12 | Daughter | — | Ohio |
| 10 | Nathan Tillett | 42 | Head | Moulder | Tennessee |
| 11 | Nathan Jr. Tillett | 17 | Son | — | Tennessee |
| 12 | Paul E. Davis | 47 | Head | Credit Manager | Ohio |
| 13 | Florence Davis | 49 | Wife | — | Ohio |
| 14 | James Davis | 19 | Son | Maker | Ohio |
| 15 | Mary A. Gorman | 84 | Mother-in-law | — | Ohio |
| 16 | Charles W. Feicht | 52 | Head | Boilermaker | Ohio |
| 17 | Betty Feicht | 20 | Daughter | — | Ohio |
| 18 | Robert Feicht | 18 | Son | — | Ohio |
| 19 | Charles Feicht | 16 | Son | — | Ohio |
| 20 | Mary Feicht | 14 | Daughter | — | Ohio |
| 21 | John Callahan THIS PERSON | 59 | Head | Boilermaker Helper | Ohio |
| 22 | Grace Callahan | 57 | Wife | Cigar Maker | Ohio |
| 23 | Robert Callahan | 27 | Son | Accountant | Ohio |
| 24 | Herbert Callahan | 35 | Son | — | Ohio |
| 25 | Cecil Callahan | 31 | Daughter-in-law | Designer | Ohio |
| 26 | Betty Edith Davis | 12 | Granddaughter | — | Ohio |
| 27 | Charles Fryinger | 60 | Head | Contractor | Ohio |
| 28 | Jennie Fryinger | 56 | Wife | Cook | Ohio |
| 29 | Robert N. Fryinger | 18 | Son | — | Ohio |
| 30 | Raymond Burkey | 37 | Head | Barber | Ohio |
| 31 | Marie Burkey | 32 | Wife | — | Ohio |
| 32 | Richard Burkey | 5 | Son | — | Ohio |
| 33 | Roger Burkey | 4 | Son | — | Ohio |
| 34 | Gerald Fry | 30 | Head | Salesman | Ohio |
| 35 | Marie Fry | 28 | Wife | — | Ohio |
| 36 | Jackie Fry | 10 | Son | — | Ohio |
| 37 | Dickie Fry | 8 | Son | — | Ohio |
| 38 | Larry Fry | 1 | Son | — | Ohio |
| 39 | Arnell Cross | 33 | Head | Truck Driver | Ohio |
| 40 | Margaret Cross | 31 | Wife | Teacher | Ohio |
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)