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.~1910), then head of a 5-person household.
Age 30
b. ~1910
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 | 30 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | Short Mountain |
| 1935 Residence (County) | Logan |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
| Township / Ward | Short Mountain |
| Est. Birth Year | ~1910 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Koch | Spouse | — | 30 | ~1910 |
| Paul Koch | Head | — | 34 | ~1906 |
| Eva Koch | Daughter | — | 8 | ~1932 |
| Patsy Koch | Daughter | — | 6 | ~1934 |
| Annie Koch | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Logan, Arkansas
Spouse, age 20
Logan, Arkansas · implied b. ~1910 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keck |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Arkansas |
| Age at First Marriage | 19 |
| Father's Birthplace | Arkansas |
| Mother's Birthplace | Arkansas |
| Can Read/Write | Yes |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
1940
Logan-County, Arkansas
Spouse, age 30
Logan-County, Arkansas · implied b. ~1910 — 5 household members
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Arkansas |
| 1935 Residence (City) | Short Mountain |
| 1935 Residence (County) | Logan |
| Class of Worker | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| 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 30 · b. ~1910 · Arkansas
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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 — 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-t0627-00151-00575)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Dewey Hume | 35 | Head | — | Arkansas |
| 42 | Sarah L. Hume | 25 | Wife | — | Arkansas |
| 43 | John Schwartz | 41 | Head | Miner | Arkansas |
| 44 | Catherine Schwartz | 36 | Wife | — | Arkansas |
| 45 | William Schwartz | 15 | Son | — | Arkansas |
| 46 | James Schwartz | 11 | Son | — | Arkansas |
| 47 | Charles Schwartz | 9 | Son | — | Arkansas |
| 48 | Stella M. Schwartz | 8 | Daughter | — | Arkansas |
| 49 | Barbara A. Schwartz | 6 | Daughter | — | Arkansas |
| 50 | Ross L. Hume | 75 | Head | Farmer | Alabama |
| 51 | Lamar Hume | 24 | Son | Farmer | Arkansas |
| 52 | Cleo Hume | 17 | Daughter | — | Arkansas |
| 53 | John King | 30 | Head | Miner | Oklahoma |
| 54 | Tellene King | 24 | Wife | — | Arkansas |
| 55 | Elizabeth A. King | 8 | Daughter | — | Arkansas |
| 56 | Hellen M. King | 5 | Daughter | — | Arkansas |
| 57 | Gidley D. Rainwater | 49 | Head | Miner | Arkansas |
| 58 | Lillie J. Rainwater | 45 | Wife | — | Arkansas |
| 59 | Louise Rainwater | 16 | Daughter | — | Arkansas |
| 60 | Robert L. Rainwater | 5 | Son | — | Arkansas |
| 61 | Paul P. Koch | 34 | Head | Miner | Arkansas |
| 62 | Mary Koch THIS PERSON | 30 | Wife | — | Arkansas |
| 63 | Annie L. Koch | 10 | Daughter | — | Arkansas |
| 64 | Eva J. Koch | 8 | Daughter | — | Arkansas |
| 65 | Patsy J. Koch | 6 | Daughter | — | Arkansas |
| 66 | Tom Wallis | 34 | Head | Farmer | Alabama |
| 67 | Travis Wallis | 24 | Son | Farmer | Arkansas |
| 68 | Ethel Wallis | 29 | Daughter in law | — | Arkansas |
| 69 | William Wallis | 36 | Brother | — | Alabama |
| 70 | Clem R. Schwartz | 33 | Head | Farmer | Arkansas |
| 71 | Jannie Schwartz | 31 | Wife | — | Arkansas |
| 72 | Evelyn H. Schwartz | 7 | Daughter | — | Arkansas |
| 73 | Mary Loyd | 65 | Mother in law | — | Arkansas |
| 74 | Elmer Hixson | 56 | Head | Road Work | Arkansas |
| 75 | Sue Hixson | 51 | Wife | — | Arkansas |
| 76 | Marvin Hixson | 16 | Son | — | Arkansas |
| 77 | Hazel Rice | 32 | Daughter | — | Arkansas |
| 78 | Edgar L. Parish | 34 | Head | Miner | Arkansas |
| 79 | Irene Parish | 37 | Wife | — | Arkansas |
| 80 | Nina J. Parish | 9 | 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)