MK
Mary Keller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hancock-County, Ohio
Our Model Tree links this Mary Keller across the 1930 and 1940 US Censuses in Hancock-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 8-person household.
Age 10
b. ~1930
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hancock-County, Ohio |
| Surname | Keller |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Eagle Twp. |
| Additional Details | |
| Highest Grade | 4 |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Eagle Twp |
| Est. Birth Year | ~1930 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Joan Keller | Daughter | — | 9 | ~1931 |
| Mary Keller | Daughter | — | 10 | ~1930 |
| Lucille Keller | Daughter | — | 7 | ~1933 |
| Carol Keller | Daughter | — | 12 | ~1928 |
| Wallace Keller | Head | — | 37 | ~1903 |
| Leland Keller | Other | — | 17 | ~1923 |
| George Keller | Son | — | 3 | ~1937 |
| Enid Keller | Spouse | — | 34 | ~1906 |
Census Appearances
1930
Hancock, Ohio
Daughter, age
Hancock, Ohio · implied b. ~1930 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Killer |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | England |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hancock-County, Ohio
Daughter, age 10
Hancock-County, Ohio · implied b. ~1930 — 8 household members
| Surname | Keller |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Eagle Twp. |
| Highest Grade | 4 |
| 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 Mary Keller across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Keller
Daughter · 1940 · age 10 · b. ~1930 · Ohio
★ You are viewing this record
Sibling
George Keller
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carol Keller
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Keller
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Keller
Sibling · 1940 · age 9
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 — Hancock-County, Ohio
Open full size
1940 US Federal Census — Hancock-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03081-00192)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Fred A. Wise | 23 | Boarder | Farm Helper | Ohio |
| 42 | Eva May Wise | 17 | Boarder | — | Ohio |
| 43 | Charles W. Huffman | 48 | Head | Moulder | Ohio |
| 44 | Nellie M. Huffman | 48 | Wife | — | Ohio |
| 45 | Janice L. Huffman | 13 | Daughter | — | Ohio |
| 46 | Carlos Poe | 26 | Head | Farmer | Ohio |
| 47 | Bernadine Poe | 24 | Wife | — | Ohio |
| 48 | Edith Ann Poe | 1 | Daughter | — | Ohio |
| 49 | Yell Hartman | 48 | Head | Caretaker | Ohio |
| 50 | Elda Hartman | 44 | Wife | — | Ohio |
| 51 | Elmer Hartman | 22 | Son | Laborer | Ohio |
| 52 | Wilbur Hartman | 18 | Son | — | Ohio |
| 53 | Norman Hartman | 13 | Son | — | Ohio |
| 54 | Ralph D. Foreman | 58 | Head | Farming | Ohio |
| 55 | Alice Foreman | 57 | Wife | — | Ohio |
| 56 | Kathryn Foreman | 21 | Daughter | Typist | Ohio |
| 57 | Clark Jr. Miller | 25 | Boarder | Farm Helper | Ohio |
| 58 | Ira D. Roth | 45 | Head | Farmer | Ohio |
| 59 | Louise E. Roth | 37 | Wife | — | Ohio |
| 60 | Fairy Roth | 7 | Daughter | — | Ohio |
| 61 | Harold Roth | 4 | Son | — | Ohio |
| 62 | Thaddeus Keller | 64 | Head | Farmer | Ohio |
| 63 | Pearl Keller | 59 | Wife | — | Ohio |
| 64 | Wallace Keller | 37 | Head | Farmer | Ohio |
| 65 | Enid G. Keller | 34 | Wife | — | England |
| 66 | Leland Keller | 17 | Brother | — | Ohio |
| 67 | Carol Jean Keller | 12 | Daughter | — | Ohio |
| 68 | Mary Lou Keller THIS PERSON | 10 | Daughter | — | Ohio |
| 69 | Joan Keller | 9 | Daughter | — | Ohio |
| 70 | Lucille Keller | 7 | Daughter | — | Ohio |
| 71 | George Keller | 3 | Son | — | Ohio |
| 72 | Edgar Bell | 24 | Head | Valve Maker | Ohio |
| 73 | Mildred Bell | 23 | Wife | — | Ohio |
| 74 | Marilyn Ann Bell | 2 | Daughter | — | Ohio |
| 75 | Robert Cross | 58 | Head | Farmer | Ohio |
| 76 | Ollie Cross | 51 | Wife | — | Ohio |
| 77 | Iota Jean Cross | 11 | Daughter | — | Ohio |
| 78 | Frank E. George | 46 | Head | Farmer | Ohio |
| 79 | Emma George | 40 | Wife | — | Ohio |
| 80 | Mary Ellen George | 9 | Daughter | — | 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)