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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marshall-County, Kansas
Our Model Tree links this John Koch across the 1920, 1930 and 1940 US Censuses in Marshall-County, Kansas (XGBoost, ~Confirmed) — first a head (b.~1879), then head of a 5-person household.
Age 61
b. ~1879
Male
Head
Born: Kansas
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marshall-County, Kansas |
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Kansas |
| 1935 Residence (City) | Vermillion |
| 1935 Residence (County) | Marshall |
| Additional Details | |
| Occupation | laborer |
| Industry | on farm |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 300 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
| Occupation | Laborer |
| Township / Ward | Vermillion |
| Est. Birth Year | ~1879 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| William Koch | Son | — | 16 | ~1924 |
| James Koch | Son | — | 15 | ~1925 |
| Katherine Koch | Daughter | — | 13 | ~1927 |
| Marcella Koch | Spouse | — | 52 | ~1888 |
| John Koch | Head | — | 61 | ~1879 |
Census Appearances
1920
Nemaha, Kansas
Head, age 41
Nemaha, Kansas · implied b. ~1879 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John P |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Kansas |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
1930
Nemaha, Kansas
Head, age 51
Nemaha, Kansas · implied b. ~1879 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Kansas |
| Age at First Marriage | 31 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
1940
Marshall-County, Kansas
Head, age 61
Marshall-County, Kansas · implied b. ~1879 — 5 household members
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Kansas |
| 1935 Residence (City) | Vermillion |
| 1935 Residence (County) | Marshall |
| Occupation | laborer |
| Industry | on farm |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 300 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
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 Koch 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 Koch
Head · 1940 · age 61 · b. ~1879 · Kansas
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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 — Marshall-County, Kansas
Open full size
1940 US Federal Census — Marshall-County, Kansas
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01245-00599)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Allen Rockwell | 6 | Son | — | Kansas |
| 2 | Clyde Overbaugh | 46 | Head | Laborer | Kansas |
| 3 | Gaynell Overbaugh | 40 | Wife | — | Missouri |
| 4 | Frances Overbaugh | 16 | Daughter | — | Kansas |
| 5 | Anamay Overbaugh | 14 | Daughter | — | Kansas |
| 6 | Eleanor Overbaugh | 12 | Daughter | — | Kansas |
| 7 | Helen Overbaugh | 8 | Daughter | — | Kansas |
| 8 | Charles Gibson | 23 | Son | Laborer | Kansas |
| 9 | William Gibson | 19 | Son | Forestry | Kansas |
| 10 | Sophie Stowell | 54 | Head | — | Kansas |
| 11 | Theodore Stowell | 28 | Son | — | Kansas |
| 12 | Michael Mackey | 52 | Head | Farmer | Kansas |
| 13 | John Mackey | 37 | Brother | Farmer | Kansas |
| 14 | William Mackey | 35 | Brother | Farmer | Kansas |
| 15 | Katherine Mackey | 75 | Mother | — | New York |
| 16 | Vincent Traut | 27 | Head | Farmer | Kansas |
| 17 | Frank Traut | 67 | Father | — | Maryland |
| 18 | Anna Traut | 20 | Sister | — | Kansas |
| 19 | John Koch THIS PERSON | 61 | Head | Laborer | Kansas |
| 20 | Marcella Koch | 52 | Wife | — | Kansas |
| 21 | William Koch | 16 | Son | — | Kansas |
| 22 | James Koch | 15 | Son | — | Kansas |
| 23 | Katherine Koch | 13 | Daughter | — | Kansas |
| 24 | Ruth Kemper | 40 | Head | — | Washington |
| 25 | Kate Kemper | 16 | Daughter | — | Kansas |
| 26 | Delora Montague | 73 | Mother | — | Ohio |
| 27 | Everett Warner | 34 | Head | Farmer | Kansas |
| 28 | Emma Warner | 34 | Wife | — | Kansas |
| 29 | Ronald Warner | 4 | Son | — | Kansas |
| 30 | Loleta Warner | 0 | Daughter | — | Kansas |
| 31 | Marvin Jones | 32 | Head | Farmer | Kansas |
| 32 | Emma Jones | 33 | Wife | — | Kansas |
| 33 | Jerry Jones | 7 | Son | — | Kansas |
| 34 | Lanny Jones | 1 | Son | — | Kansas |
| 35 | Merl Stiner | 34 | Head | Farmer | Kansas |
| 36 | Nellie Stiner | 32 | Wife | — | Kansas |
| 37 | Linnea Stiner | 14 | Son | — | Kansas |
| 38 | John Stiner | 12 | Son | — | Kansas |
| 39 | Marilyn Stiner | 7 | Daughter | — | Kansas |
| 40 | Karen Stiner | 4 | Daughter | — | Kansas |
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)