MK
Mary Keller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dallas-County, Iowa
Our Model Tree links this Mary Keller across the 1930 and 1940 US Censuses in Dallas-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Dallas-County, Iowa |
| Surname | Keller |
| Given Name | Mary S. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Walnut Twp. |
| 1935 Residence (County) | Dallas |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Walnut Twp |
| Est. Birth Year | ~1925 |
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 |
|---|---|---|---|---|
| Mary Keller | Daughter | — | 15 | ~1925 |
| Ruth Keller | Daughter | — | 9 | ~1931 |
| D Keller | Daughter | — | 13 | ~1927 |
| P Keller | Head | — | 41 | ~1899 |
| Lucile Keller | Other | — | 36 | ~1904 |
| Joseph Keller | Son | — | 5 | ~1935 |
| Peter Keller | Son | — | 2 | ~1938 |
| Arlie Keller | Spouse | — | 38 | ~1902 |
Census Appearances
1930
Dallas, Iowa
Daughter, age 5
Dallas, Iowa · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keller |
| Given Name | Mary S. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Pennsylvania |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dallas-County, Iowa
Daughter, age 15
Dallas-County, Iowa · implied b. ~1925 — 8 household members
| Surname | Keller |
| Given Name | Mary S. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Walnut Twp. |
| 1935 Residence (County) | Dallas |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 15 · b. ~1925 · Iowa
★ You are viewing this record
Sibling
D Keller
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peter Keller
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Keller
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth 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 — Dallas-County, Iowa
Open full size
1940 US Federal Census — Dallas-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01153-00726)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bennie W. Daniel | 26 | Head | Farming | Iowa |
| 42 | Hazel Daniel | 25 | Wife | — | Iowa |
| 43 | Shirley A. Daniel | 0 | Daughter | — | Iowa |
| 44 | Art Zimmerman | 77 | Father-in-law | — | Penn |
| 45 | Harvey W. Keller | 59 | Head | Farming | Iowa |
| 46 | Elizabeth Keller | 51 | Wife | — | Ohio |
| 47 | Lucille L. Keller | 28 | Daughter | — | Iowa |
| 48 | Henry D. Keller | 26 | Son | Farming | Iowa |
| 49 | David R. Keller | 24 | Son | Farming | Iowa |
| 50 | Eva J. Keller | 18 | Daughter | — | Iowa |
| 51 | Mary J. Keller | 15 | Daughter | — | Iowa |
| 52 | John Mack | 38 | Head | Farming | Iowa |
| 53 | Mary E. Mack | 38 | Wife | — | Iowa |
| 54 | Isaiah B. Keller | 35 | Head | Farming | Iowa |
| 55 | L. Elizabeth Keller | 34 | Wife | — | Iowa |
| 56 | Betty J. Keller | 11 | Daughter | — | Iowa |
| 57 | Mary J. Keller | 9 | Daughter | — | Iowa |
| 58 | B. Eileen Keller | 6 | Daughter | — | Iowa |
| 59 | Frank De Bruel | 37 | Hired man | Farming | Iowa |
| 60 | William H. Keller | 39 | Head | Farming | Iowa |
| 61 | Mary H. Keller | 30 | Wife | — | Iowa |
| 62 | Norma S. Keller | 16 | Daughter | — | Iowa |
| 63 | Marjorie Keller | 14 | Daughter | — | Iowa |
| 64 | Mary Lou Keller | 10 | Daughter | — | Iowa |
| 65 | L. S. Humbaker | 54 | Head | Farming | Ill |
| 66 | Eliza D. Humbaker | 59 | Wife | — | Ohio |
| 67 | Frank W. Humbaker | 27 | Son | Farming | Iowa |
| 68 | Leo V. Humbaker | 25 | Son | Farming | Iowa |
| 69 | Virgil V. Humbaker | 20 | Son | Farming | Iowa |
| 70 | Dale L. Humbaker | 17 | Son | Farming | Iowa |
| 71 | P. A. Keller | 41 | Head | Farming | Iowa |
| 72 | Arlie D. Keller | 38 | Wife | — | Penn |
| 73 | Mary S. Keller THIS PERSON | 15 | Daughter | — | Iowa |
| 74 | D. H. Keller | 13 | Daughter | — | Iowa |
| 75 | Ruth E. Keller | 9 | Daughter | — | Iowa |
| 76 | Joseph W. Keller | 5 | Son | — | Iowa |
| 77 | Peter A. Keller | 2 | Son | — | Iowa |
| 78 | Lucile Keller | 36 | Sister | — | Iowa |
| 79 | Melvin E. Ball | 56 | Head | Rail Road | Iowa |
| 80 | Clara S. Ball | 55 | Wife | — | Iowa |
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)