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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mccone-County, Montana
Our Model Tree links this John Koch across the 1920, 1930 and 1940 US Censuses in Mccone-County, Montana (XGBoost, ~Confirmed) — first a head (b.~1886), then head of a 3-person household.
Age 54
b. ~1886
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mccone-County, Montana |
| Surname | Koch |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | McCone |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Montana |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | School District 8 |
| Est. Birth Year | ~1886 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Claudine Koch | Spouse | — | 54 | ~1886 |
| John Koch | Head | — | 54 | ~1886 |
| Howard Koch | Son | — | 20 | ~1920 |
Census Appearances
1920
Mccone, Montana
Head, age 34
Mccone, Montana · implied b. ~1886 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | Home farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | R |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Mccone, Montana
Head, age 45
Mccone, Montana · implied b. ~1885 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Mccone-County, Montana
Head, age 54
Mccone-County, Montana · implied b. ~1886 — 3 household members
| Surname | Koch |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | McCone |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Montana |
| 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 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 54 · b. ~1886 · Montana
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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 — Mccone-County, Montana
Open full size
1940 US Federal Census — Mccone-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02223-00553)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William C. Jordan | 44 | Head | Farmer | Illinois |
| 2 | Helen N. Jordan | 28 | Wife | — | Russia |
| 3 | Lewis L. Jordan | 7 | Son | — | Montana |
| 4 | Fern H. Jordan | 5 | Daughter | — | Montana |
| 5 | Archie H. Amundson | 33 | Head | Hired Hand | Wisconsin |
| 6 | Jack Kildare | 35 | Head | Hired Hand | Australia |
| 7 | John Beaver | 51 | Head | Farmer | South Dakota |
| 8 | Ella J. Beaver | 41 | Wife | Postmistress | Ohio |
| 9 | Gustave A. Blomberg | 50 | Head | Farmer | Sweden |
| 10 | Kathryn Blomberg | 43 | Wife | — | South Dakota |
| 11 | Eunice M. Blomberg | 24 | Daughter | — | Montana |
| 12 | Robert J. Blomberg | 20 | Son | Clerk | Montana |
| 13 | Francis K. Blomberg | 17 | Daughter | — | Montana |
| 14 | John H. Koch THIS PERSON | 54 | Head | Farmer | Iowa |
| 15 | Claudine F. Koch | 54 | Wife | — | Wisconsin |
| 16 | Howard L. Koch | 20 | Son | — | Montana |
| 17 | Theodore Langemo | 54 | Head | Farmer | Minnesota |
| 18 | Beatrice E. Langemo | 42 | Wife | — | Montana |
| 19 | Theodore N. Langemo | 16 | Son | — | Montana |
| 20 | Donald P. Langemo | 14 | Son | — | Montana |
| 21 | James W. Langemo | 13 | Son | — | Montana |
| 22 | Edward D. Langemo | 12 | Son | — | Montana |
| 23 | Edith L. Langemo | 7 | Daughter | — | Montana |
| 24 | Helen M. Langemo | 1 | Daughter | — | Montana |
| 25 | William J. Mackin | 50 | Head | Farmer | Minnesota |
| 26 | Mary A. Mackin | 49 | Wife | — | Wisconsin |
| 27 | James M. Walcom | 57 | Head | Farmer | Illinois |
| 28 | Althea M. Walcom | 53 | Wife | — | Iowa |
| 29 | Russell W. Walcom | 23 | Son | Hired Hand Logging | Montana |
| 30 | Irene A. Walcom | 17 | Daughter | — | Montana |
| 31 | Evan B. Hughes | 54 | Head | Farmer | Iowa |
| 32 | Anna M. Malicot | 52 | Head | Farmer | Rumania |
| 33 | Salmo Kogele | 24 | Hired Hand | Hired Hand | Montana |
| 34 | Peter K. Rorvik | 51 | Head | Farmer | Norway |
| 35 | Aurelia E. Rorvik | 40 | Wife | — | Missouri |
| 36 | Verna L. Rorvik | 17 | Daughter | — | Montana |
| 37 | John B. Rorvik | 50 | Head | Farmer | Norway |
| 38 | Jennie Rorvik | 50 | Wife | — | Iowa |
| 39 | Carl Moe | 52 | Head | Farmer | Norway |
| 40 | Raymond H. Jones | 51 | Head | Farmer | Minnesota |
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)