JK
John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Logan-County, Arkansas
Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Logan-County, Arkansas (XGBoost, ~Confirmed) — first a head (b.~1906), then head of a 5-person household.
Age 34
b. ~1906
Male
Head
Born: Arkansas
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Logan-County, Arkansas |
| Surname | Koch |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Logan |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 30 |
| Income (1939) | 50 |
| Highest Grade | No 7 |
| 1935 Residence | Arkansas |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
| Occupation | Farmer |
| Township / Ward | Shoal Creek Twp |
| Est. Birth Year | ~1906 |
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 |
|---|---|---|---|---|
| Magdalena Koch | Spouse | — | 32 | ~1908 |
| Harold Koch | Son | — | 4 | ~1936 |
| Marietta Koch | Daughter | — | 2 | ~1938 |
| John Koch | Son | — | 8 | ~1932 |
| John Koch | Head | — | 34 | ~1906 |
Census Appearances
1930
Logan, Arkansas
Head, age 25
Logan, Arkansas · implied b. ~1905 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Arkansas |
| Age at First Marriage | 23 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 14 |
| Radio Set | R |
| Veteran | No |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
1940
Logan-County, Arkansas
Head, age 34
Logan-County, Arkansas · implied b. ~1906 — 5 household members
| Surname | Koch |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Logan |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 30 |
| Income (1939) | 50 |
| Highest Grade | No 7 |
| 1935 Residence | Arkansas |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Koch
Head · 1940 · age 34 · b. ~1906 · Arkansas
★ 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 — Logan-County, Arkansas
Open full size
1940 US Federal Census — Logan-County, Arkansas
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00151-00438)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elizabeth Koch | 3 | Daughter | — | Arkansas |
| 42 | Edward Koch | 23 | Brother | Laborer | Arkansas |
| 43 | Burl Davis | 24 | Head | Miner | Arkansas |
| 44 | Edith Davis | 16 | Wife | — | Arkansas |
| 45 | Bobby Davis | 1 | Son | — | Arkansas |
| 46 | Alberta Burnham | 60 | Head | — | Arkansas |
| 47 | Ray Horn | 17 | Nephew | — | Arkansas |
| 48 | Ira Cravens | 46 | Head | Farmer | Arkansas |
| 49 | Ila Cravens | 30 | Wife | — | Arkansas |
| 50 | Garland Cravens | 20 | Son | Laborer | Arkansas |
| 51 | Wanda Fay Cravens | 2 | Daughter | — | California |
| 52 | Henry Sr. Friga | 44 | Head | Farmer | Pennsylvania |
| 53 | Rosie Friga | 37 | Wife | — | Arkansas |
| 54 | Gregory Friga | 15 | Son | — | Arkansas |
| 55 | Edmond Friga | 13 | Son | — | Arkansas |
| 56 | Ewing Friga | 11 | Daughter | — | Arkansas |
| 57 | Mary B. Friga | 3 | Daughter | — | Arkansas |
| 58 | Anton J. Anhalt | 66 | Head | Proprietor | Illinois |
| 59 | Mary Anhalt | 58 | Wife | — | Arkansas |
| 60 | Hilda Anhalt | 29 | Daughter | — | Arkansas |
| 61 | John Friga | 46 | Head | Miner | Pennsylvania |
| 62 | Bernie Friga | 21 | Son | Farmer | Arkansas |
| 63 | Hermina Friga | 19 | Daughter | — | Arkansas |
| 64 | Gerhard Friga | 17 | Son | — | Arkansas |
| 65 | Leon Friga | 15 | Son | — | Arkansas |
| 66 | Catherine Friga | 13 | Daughter | — | Arkansas |
| 67 | Rosemary Friga | 11 | Daughter | — | Arkansas |
| 68 | Katie Tavelace | 67 | Head | — | Germany |
| 69 | Mary J. Tavelace | 9 | Niece | — | Arkansas |
| 70 | Ben G. Jr. Tavelace | 7 | Nephew | — | Arkansas |
| 71 | Elabard Gensing | 26 | Head | Farmer | Arkansas |
| 72 | Sophie Gensing | 24 | Wife | — | Arkansas |
| 73 | Annie Rose Gensing | 3 | Daughter | — | Arkansas |
| 74 | Edward Jr. Gensing | 2 | Son | — | Arkansas |
| 75 | John B. Koch THIS PERSON | 34 | Head | Farmer | Arkansas |
| 76 | Magdalena Koch | 32 | Wife | — | Arkansas |
| 77 | John B. Jr. Koch | 8 | Son | — | Arkansas |
| 78 | Harold Joe Koch | 4 | Son | — | Arkansas |
| 79 | Marietta Koch | 2 | Daughter | — | Arkansas |
| 80 | Marie Schmidt | 49 | Head | — | Arkansas |
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)