JK
John Keller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Scott-County, Iowa
Our Model Tree links this John Keller across the 1930 and 1940 US Censuses in Scott-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 9-person household.
Age 62
b. ~1878
Male
Head
Born: Switzerland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Scott-County, Iowa |
| Surname | Keller |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Switzerland |
| 1935 Residence (City) | Buffalo |
| 1935 Residence (County) | Scott |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farm operator |
| Industry | General farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 87 |
| Highest Grade | G 8 |
| 1935 Residence | Same place |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
| Occupation | Farm Operator |
| Township / Ward | Buffalo |
| Est. Birth Year | ~1878 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rosie Keller | Daughter | — | 20 | ~1920 |
| Hildagarde Keller | Daughter | — | 21 | ~1919 |
| Gertrude Keller | Daughter | — | 23 | ~1917 |
| John Keller | Head | — | 62 | ~1878 |
| Jacob Keller | Son | — | 61 | ~1879 |
| William Keller | Son | — | 15 | ~1925 |
| Frank Keller | Son | — | 16 | ~1924 |
| Walter Keller | Son | — | 25 | ~1915 |
| Katherine Keller | Spouse | — | 51 | ~1889 |
Census Appearances
1930
Scott, Iowa
Head, age 50
Scott, Iowa · implied b. ~1880 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keller |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Switzerland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1890 |
| Age at First Marriage | 33 |
| Father's Birthplace | Switzerland |
| Mother's Birthplace | Switzerland |
| Occupation | Coalsman |
| Industry | Cement Plant |
| Class of Worker | 7803 W |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 65 |
| Veteran | No |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
1940
Scott-County, Iowa
Head, age 62
Scott-County, Iowa · implied b. ~1878 — 9 household members
| Surname | Keller |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Switzerland |
| 1935 Residence (City) | Buffalo |
| 1935 Residence (County) | Scott |
| Naturalization Status | Naturalized |
| Occupation | Farm operator |
| Industry | General farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 87 |
| Highest Grade | G 8 |
| 1935 Residence | Same place |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
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 Keller across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Keller
Head · 1940 · age 62 · b. ~1878 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Scott-County, Iowa
Open full size
1940 US Federal Census — Scott-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01202-00223)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Reefer Vaughn | 10 | Head | — | Iowa |
| 42 | Marilyn Vaughn | 9 | Daughter | — | Iowa |
| 43 | John Q Rieker | 28 | Head | Laborer In House | Iowa |
| 44 | Verda Rieker | 26 | Wife | — | Iowa |
| 45 | Mary Lou Rieker | 4 | Daughter | 0 | Iowa |
| 46 | Judith Rieker | 0 | Daughter | 0 | Iowa |
| 47 | Henry B Colgan | 29 | Head | Farm Operator | Iowa |
| 48 | Glendola Colgan | 20 | Wife | — | Iowa |
| 49 | Keith Colgan | 3 | Son | 0 | Iowa |
| 50 | John Keller THIS PERSON | 62 | Head | Farm Operator | Switzerland |
| 51 | Katherine Keller | 51 | Wife | — | Germany |
| 52 | Walter Keller | 25 | Son | Corn Tester | Iowa |
| 53 | Gertrude Keller | 23 | Daughter | Nurse | Iowa |
| 54 | Hildagarde Keller | 21 | Daughter | — | Iowa |
| 55 | Rosie Keller | 20 | Daughter | Teacher | Iowa |
| 56 | Frank Keller | 16 | Son | — | Iowa |
| 57 | William Keller | 15 | Son | — | Iowa |
| 58 | Jacob Keller | 61 | Son | Farm Hand | Switzerland |
| 59 | Eugene Lawlor | 55 | Head | Farm Operator | Iowa |
| 60 | Mary E Lawlor | 49 | Wife | — | Iowa |
| 61 | Agnes Lawlor | 24 | Daughter | Office Girl | Iowa |
| 62 | Anne Lawlor | 20 | Daughter | Teacher | Minnesota |
| 63 | Jane Lawlor | 14 | Daughter | — | Iowa |
| 64 | Neil Lawlor | 10 | Daughter | — | Iowa |
| 65 | Anselm O Winfield | 44 | Head | Farm Operator | Iowa |
| 66 | Sada Winfield | 28 | Wife | — | Iowa |
| 67 | Clarissa Winfield | 11 | Daughter | — | Iowa |
| 68 | Dorothy Winfield | 9 | Daughter | — | Iowa |
| 69 | George Winfield | 7 | Son | — | Iowa |
| 70 | George Winfield | 36 | Head | Laborer | Iowa |
| 71 | Lena Winfield | 25 | Wife | — | Iowa |
| 72 | Larry Winfield | 4 | Son | 0 | Iowa |
| 73 | Alfred Winfield | 3 | Son | 0 | Iowa |
| 74 | Alfred Echler | 63 | Father-in-law | — | Kansas |
| 75 | Henry S Mosier | 54 | Head | Operator & Farm | Iowa |
| 76 | Cora Beamer | 55 | Cousin | — | Iowa |
| 77 | William Spies | 51 | Head | Farm Operator | Iowa |
| 78 | Minna Spies | 45 | Wife | — | Iowa |
| 79 | Raymond Spies | 20 | Son | Farm Hand | Iowa |
| 80 | Harvey Spies | 13 | Son | — | 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)