ET
Ellen Thompson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clark-County, South Dakota
Our Model Tree links this Ellen Thompson across the 1920, 1930 and 1940 US Censuses in Clark-County, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1892), then head of a 4-person household.
Age 48
b. ~1892
Female
Spouse
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clark-County, South Dakota |
| Surname | Thompson |
| Given Name | Ellen |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Mt. Pleasant Township |
| 1935 Residence (County) | Clark |
| Additional Details | |
| Industry | H |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Township / Ward | Mt Pleasant Township |
| Est. Birth Year | ~1892 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ellen | Age | Birth yr |
|---|---|---|---|---|
| Ellen Thompson | Spouse | — | 48 | ~1892 |
| Thomas Thompson | Head | — | 53 | ~1887 |
| Leslie Thompson | Son | — | 20 | ~1920 |
| Orville Thompson | Son | — | 22 | ~1918 |
Census Appearances
1920
Clark, South …
Spouse, age 28
Clark, South Dakota · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Ellen M. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Clark, South …
Spouse, age 39
Clark, South Dakota · implied b. ~1891 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Ellen M |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Age at First Marriage | 18 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Clark-County, South …
Spouse, age 48
Clark-County, South Dakota · implied b. ~1892 — 4 household members
| Surname | Thompson |
| Given Name | Ellen |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Mt. Pleasant Township |
| 1935 Residence (County) | Clark |
| Industry | H |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Ellen Thompson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Ellen Thompson
Spouse · 1940 · age 48 · b. ~1892 · South Dakota
★ 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 — Clark-County, South Dakota
Open full size
1940 US Federal Census — Clark-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03851-00630)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William H. Mundhenke | 44 | Head | Farmer | South Dakota |
| 2 | Jennie S. Mundhenke | 35 | Wife | — | South Dakota |
| 3 | Bonnie Mundhenke | 9 | Daughter | — | South Dakota |
| 4 | Florence Mundhenke | 6 | Daughter | — | South Dakota |
| 5 | Ruth Mundhenke | 5 | Daughter | — | South Dakota |
| 6 | Floyd Mundhenke | 2 | Son | — | South Dakota |
| 7 | Earl Hicks | 34 | Hired man | Laborer | Missouri |
| 8 | William Gleunkin | Gleunke | 54 | Head | Farmer | Nebraska |
| 9 | Mary Hope Gleunkin | Gleunke | 52 | Wife | — | Illinois |
| 10 | Fred S. Pommer | 47 | Head | Farmer | Illinois |
| 11 | Myrtle Pommer | 42 | Wife | — | Oklahoma |
| 12 | Eunice (A.B.) Pommer | 19 | Daughter | — | South Dakota |
| 13 | Kenneth Pommer | 15 | Son | — | South Dakota |
| 14 | Erwin Pommer | 13 | Son | — | South Dakota |
| 15 | Ardis Pommer | 11 | Daughter | — | South Dakota |
| 16 | Ben H. Pommer | 60 | Head | Farmer | Illinois |
| 17 | Flora Pommer | 53 | Wife | — | Illinois |
| 18 | Eileen Pommer | 15 | Daughter | — | South Dakota |
| 19 | Trygve S. Thoreson | 52 | Head | Farmer | Norway |
| 20 | Flora Thoreson | 47 | Wife | — | South Dakota |
| 21 | Laden Thoreson | 14 | Son | — | South Dakota |
| 22 | Thomas S. Thompson | 53 | Head | Farmer | Iowa |
| 23 | Ellen Thompson THIS PERSON | 48 | Wife | — | South Dakota |
| 24 | Orville Thompson | 22 | Son | Laborer | South Dakota |
| 25 | Leslie S. Thompson | 20 | Son | Laborer | South Dakota |
| 26 | John Brenden | 45 | Head | Farmer | Norway |
| 27 | Minnie Brenden | 45 | Wife | — | South Dakota |
| 28 | Milton Brenden | 23 | Son | Farmer | South Dakota |
| 29 | Leslie Brenden | 22 | Son | Farmer | South Dakota |
| 30 | Elmo Brenden | 15 | Son | — | South Dakota |
| 31 | Mavis Brenden | 11 | Daughter | — | South Dakota |
| 32 | Roy Simpson | 37 | Head | Farmer | South Dakota |
| 33 | Ardis Simpson | 37 | Wife | — | South Dakota |
| 34 | Donald Simpson | 16 | Son | — | South Dakota |
| 35 | Lewis Peterson | 54 | Head | Farmer | South Dakota |
| 36 | Carrie S. Peterson | 54 | Wife | — | South Dakota |
| 37 | Sigurd S. Brenden | 44 | Head | Farmer | Norway |
| 38 | Geffney Brenden | 41 | Wife | — | South Dakota |
| 39 | Burdell Brenden | 21 | Son | Laborer | South Dakota |
| 40 | Arlene Brenden | 17 | Daughter | — | South Dakota |
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)