MC
Mary Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Boyd-County, Kentucky
Our Model Tree links this Mary Callahan across the 1930 and 1940 US Censuses in Boyd-County, Kentucky (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 13-person household.
Age 12
b. ~1928
Female
Daughter
Born: Kentucky
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Boyd-County, Kentucky |
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Mag. Dist. 3, Cannonsburg District |
| 1935 Residence (County) | Boyd |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Township / Ward | Mag Dist 3 Cannonsburg District |
| Est. Birth Year | ~1928 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Elmora Callahan | Daughter | — | 16 | ~1924 |
| Sarah Callahan | Daughter | — | 14 | ~1926 |
| Rosela Callahan | Daughter | — | 3 | ~1937 |
| Mary Callahan | Daughter | — | 12 | ~1928 |
| Katherine Callahan | Daughter | — | 6 | ~1934 |
| Cornelius Callahan | Son | — | 18 | ~1922 |
| Bobby Callahan | Son | — | 5 | ~1935 |
| James Callahan | Son | — | 10 | ~1930 |
| John Callahan | Son | — | 28 | ~1912 |
| Richard Callahan | Son | — | 22 | ~1918 |
| Charles Callahan | Son | — | 26 | ~1914 |
| Thomas Callahan | Son | — | 21 | ~1919 |
| Marie Callahan | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Greenup, Kentucky
Daughter, age 2
Greenup, Kentucky · implied b. ~1928 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callihan |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Boyd-County, Kentucky
Daughter, age 12
Boyd-County, Kentucky · implied b. ~1928 — 13 household members
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Kentucky |
| 1935 Residence (City) | Mag. Dist. 3, Cannonsburg District |
| 1935 Residence (County) | Boyd |
| Highest Grade | 6 |
| 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 Mary Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Callahan
Daughter · 1940 · age 12 · b. ~1928 · Kentucky
★ You are viewing this record
Sibling
Charles Callahan
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elmora Callahan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Callahan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Callahan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosela Callahan
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Callahan
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Callahan
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Callahan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cornelius Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bobby Callahan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Callahan
Sibling · 1940 · age 22
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 — Boyd-County, Kentucky
Open full size
1940 US Federal Census — Boyd-County, Kentucky
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01282-00260)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie O. Callahan | 46 | Wife | Housework | Kentucky |
| 2 | John Callahan | 28 | Son | Radiator Plant | Same place |
| 3 | Charles Callahan | 26 | Son | Dairy | Kentucky |
| 4 | Richard Callahan | 22 | Son | Home | Kentucky |
| 5 | Thomas Callahan | 21 | Son | Home | Kentucky |
| 6 | Cornelius Jr Callahan | 18 | Son | — | Kentucky |
| 7 | Elmora Callahan | 16 | Daughter | — | Kentucky |
| 8 | Sarah Callahan | 14 | Daughter | — | Kentucky |
| 9 | Mary Callahan THIS PERSON | 12 | Daughter | — | Kentucky |
| 10 | James Callahan | 10 | Son | — | Kentucky |
| 11 | Katherine Callahan | 6 | Daughter | — | Kentucky |
| 12 | Bobby Callahan | 5 | Son | — | Kentucky |
| 13 | Rosela Callahan | 3 | Daughter | — | Kentucky |
| 14 | John T. Allen | 59 | Head | Farmer | Kentucky |
| 15 | Nora Allen | 52 | Wife | Housework | Kentucky |
| 16 | Henry H. Allen | 22 | Son | Farmer | Kentucky |
| 17 | John T. Jr Allen | 17 | Son | — | Kentucky |
| 18 | Billy G. Allen | 10 | Son | — | Kentucky |
| 19 | Mitchell Dixon | 44 | Head | Armco | Kentucky |
| 20 | Marie A. Dixon | 39 | Wife | Home | Kentucky |
| 21 | Mitchell Jr. Dixon | 20 | Son | Ashland Oil | Same place |
| 22 | Roy Dixon | 18 | Son | Armco | Kentucky |
| 23 | Marvin Dixon | 15 | Son | — | Kentucky |
| 24 | Lorene Dixon | 9 | Daughter | — | Kentucky |
| 25 | Infant Dixon | 0 | Daughter | — | Kentucky |
| 26 | Milford Davis | 60 | Head | W.P.A. | Kentucky |
| 27 | Anna Q. Davis | 44 | Wife | Home | Kentucky |
| 28 | Hall Alberta Davis | 20 | Daughter | Home | Kentucky |
| 29 | Virgil Hall | 25 | Son-in-law | Scrapyard | Kentucky |
| 30 | Jean Hall | 18 | Daughter | — | Kentucky |
| 31 | David Elman Hall | 8 | Daughter | — | Kentucky |
| 32 | Billy Hall | 6 | Son | — | Kentucky |
| 33 | John H. Kliber | 35 | Head | Armco | Kentucky |
| 34 | Elsie A. Kliber | 26 | Wife | Teacher | Kentucky |
| 35 | Ella O. Spurlock | 43 | Head | Home | Kentucky |
| 36 | Ora Spurlock | 25 | Son | Armco | Kentucky |
| 37 | Garnett Spurlock | 21 | Daughter | Home | Kentucky |
| 38 | George F. Spurlock | 19 | Son | — | Kentucky |
| 39 | Ada M. Spurlock | 18 | Daughter | — | Kentucky |
| 40 | Billy J. Spurlock | 16 | Son | — | Kentucky |
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)