MK
Mary Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Logan-County, Arkansas
Our Model Tree links this Mary Koch across the 1930 and 1940 US Censuses in Logan-County, Arkansas (XGBoost, ~Confirmed) — first a spouse (b.~1897), then head of a 11-person household.
Age 43
b. ~1897
Female
Spouse
Born: Arkansas
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Logan-County, Arkansas |
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | Logan Township |
| 1935 Residence (County) | Logan |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
| Township / Ward | Logan Township |
| Est. Birth Year | ~1897 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Raymond Koch | Son | — | 2 | ~1938 |
| Mary Koch | Spouse | — | 43 | ~1897 |
| Englebert Koch | Son | — | 21 | ~1919 |
| Magdalene Koch | Daughter | — | 8 | ~1932 |
| Clara Koch | Daughter | — | 22 | ~1918 |
| George Koch | Head | — | 46 | ~1894 |
| Margaret Koch | Daughter | — | 6 | ~1934 |
| Dennis Koch | Son | — | 4 | ~1936 |
| Eugene Koch | Son | — | 15 | ~1925 |
| Julia Koch | Daughter | — | 11 | ~1929 |
| Edward Koch | Son | — | 17 | ~1923 |
Census Appearances
1930
Logan, Arkansas
Spouse, age 33
Logan, Arkansas · implied b. ~1897 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Arkansas |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Arkansas |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
1940
Logan-County, Arkansas
Spouse, age 43
Logan-County, Arkansas · implied b. ~1897 — 11 household members
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | Logan Township |
| 1935 Residence (County) | Logan |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Mary Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Koch
Spouse · 1940 · age 43 · b. ~1897 · 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
39 people indexed on this census page (nara:1940:m-t0627-00151-00314)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George W. Koch | 46 | Head | Farmer | Arkansas |
| 2 | Mary Koch THIS PERSON | 43 | Wife | — | Arkansas |
| 3 | Clara Koch | 22 | Daughter | Servant | Arkansas |
| 4 | Englebert Koch | 21 | Son | Miner | Arkansas |
| 5 | Edward Koch | 17 | Son | — | Arkansas |
| 6 | Eugene Koch | 15 | Son | — | Arkansas |
| 7 | Julia Koch | 11 | Daughter | — | Arkansas |
| 8 | Magdalene Koch | 8 | Daughter | — | Arkansas |
| 9 | Margaret Koch | 6 | Daughter | — | Arkansas |
| 10 | Dennis Koch | 4 | Son | — | Arkansas |
| 11 | Raymond Koch | 2 | Son | — | Arkansas |
| 12 | Fred Kremers | 64 | Head | Farmer | Germany |
| 13 | Katie Kremers | 61 | Wife | — | Holland |
| 14 | John H. Janzen | 66 | Head | Farmer | Indiana |
| 15 | Louise Janzen | 55 | Wife | — | Arkansas |
| 16 | John Janzen | 28 | Son | Farmer | Arkansas |
| 17 | Leo Janzen | 20 | Son | Farmer | Arkansas |
| 18 | Irene Janzen | 16 | Daughter | — | Arkansas |
| 19 | Henry C. Berg | 44 | Head | Operator | Missouri |
| 20 | Clara Berg | 32 | Wife | — | Arkansas |
| 21 | Henry Berg | 7 | Son | — | Arkansas |
| 22 | James Berg | 4 | Son | — | Arkansas |
| 23 | Patricia Ann Berg | 2 | Daughter | — | Arkansas |
| 24 | Henry Heinen | 62 | Head | Farmer | Germany |
| 25 | Hedwig Heinen | 40 | Wife | — | Arkansas |
| 26 | William E. Mcclure | 44 | Head | Laborer | Missouri |
| 27 | Amber Mcclure | 37 | Wife | — | Missouri |
| 28 | Lola Mcclure | 19 | Daughter | — | Nebraska |
| 29 | Loyd Mcclure | 17 | Son | — | Nebraska |
| 30 | Martha Mcclure | 15 | Daughter | — | Wyoming |
| 31 | John Mcclure | 12 | Son | — | Wyoming |
| 32 | Virginia Mcclure | 11 | Daughter | — | Nebraska |
| 33 | Wanda Mcclure | 8 | Daughter | — | Arkansas |
| 34 | Bonnie Mcclure | 5 | Daughter | — | Arkansas |
| 35 | Winford Mcclure | 3 | Son | — | Arkansas |
| 36 | Harris Mcclure | 2 | Granddaughter | — | Arkansas |
| 37 | Alonzo A. Wise | 65 | Head | Farmer | Missouri |
| 38 | Mary Wise | 57 | Wife | — | Arkansas |
| 39 | Albie Lee Wise | 18 | Daughter | — | 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)