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Robert Robertson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clay-County, South Dakota
Our Model Tree links this Robert Robertson across the 1920, 1930 and 1940 US Censuses in Clay-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 3-person household.
Age 62
b. ~1878
Male
Head
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clay-County, South Dakota |
| Surname | Robertson |
| Given Name | Robert J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Garfield Twp |
| 1935 Residence (County) | Clay |
| Additional Details | |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | E |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Farmer |
| Township / Ward | Garfield Twp |
| Est. Birth Year | ~1878 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Scott Robertson | Son | — | 27 | ~1913 |
| Robert Robertson | Head | — | 62 | ~1878 |
| Evelyn Robertson | Other | — | 28 | ~1912 |
Census Appearances
1920
Clay, South …
Head, age 43
Clay, South Dakota · implied b. ~1877 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Robertson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Clay, South …
Head, age 52
Clay, South Dakota · implied b. ~1878 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Robertson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | VVV |
| Can Read/Write | Yes |
| Home Owned/Rented | 3000 |
| Home Value / Rent | R |
| Veteran | O |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Clay-County, South …
Head, age 62
Clay-County, South Dakota · implied b. ~1878 — 3 household members
| Surname | Robertson |
| Given Name | Robert J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Garfield Twp |
| 1935 Residence (County) | Clay |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | E |
| Hours Worked | 30 |
| Income (1939) | 0 |
| 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 Robert Robertson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Robert Robertson
Head · 1940 · age 62 · b. ~1878 · 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 — Clay-County, South Dakota
Open full size
1940 US Federal Census — Clay-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03851-00792)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Andrus | 57 | Brother | Farmer | South Dakota |
| 2 | Matilda Andrus | 50 | Sister | — | Sweden |
| 3 | John Andrus | 67 | Brother | Farmer | South Dakota |
| 4 | Fred Henrikson | 36 | Head | Farm Laborer | South Dakota |
| 5 | May Henrikson | 34 | Wife | — | South Dakota |
| 6 | Robert Henrikson | 13 | Son | — | South Dakota |
| 7 | Ruth Henrikson | 11 | Daughter | — | South Dakota |
| 8 | Grace Henrikson | 9 | Daughter | — | South Dakota |
| 9 | Joyce Henrikson | 7 | Daughter | — | South Dakota |
| 10 | Elva Henrikson | 5 | Daughter | — | South Dakota |
| 11 | Elaine Henrikson | 2 | Daughter | — | South Dakota |
| 12 | Chester Wylie | 37 | Head | Farmer | Illinois |
| 13 | Mable Wylie | 33 | Wife | — | Iowa |
| 14 | Wayne Wylie | 12 | Son | — | South Dakota |
| 15 | Laverne Wylie | 11 | Son | — | South Dakota |
| 16 | Donald Wylie | 9 | Son | — | South Dakota |
| 17 | Evelyn Wylie | 7 | Daughter | — | South Dakota |
| 18 | Leo Wylie | 4 | Son | — | South Dakota |
| 19 | Johanna Hoyer | 60 | Head | — | Sweden |
| 20 | Andy E. Lawrence | 51 | Head | Farmer | South Dakota |
| 21 | Jessie C. Lawrence | 51 | Wife | — | South Dakota |
| 22 | Leone Lawrence | 24 | Daughter | — | South Dakota |
| 23 | Elvin Lawrence | 21 | Son | Farm Laborer | South Dakota |
| 24 | Grace Lawrence | 17 | Daughter | — | South Dakota |
| 25 | Elyn R. Lawrence | 11 | Son | — | South Dakota |
| 26 | Selmer Offerdahl | 23 | Head | Farm Laborer | Montana |
| 27 | Bertha Offerdahl | 20 | Wife | — | South Dakota |
| 28 | Barbara Offerdahl | 2 | Daughter | — | South Dakota |
| 29 | Martin Jensen | 39 | Head | Farmer | Denmark |
| 30 | Catanka Jensen | 41 | Wife | — | Iowa |
| 31 | Marion Jensen | 12 | Daughter | — | South Dakota |
| 32 | Henry Christiansen | 55 | Brother-in-law | — | Iowa |
| 33 | Arthur Emerson | 51 | Head | Farmer | South Dakota |
| 34 | Emma Emerson | 52 | Wife | — | South Dakota |
| 35 | Russell A. Emerson | 20 | Son | — | South Dakota |
| 36 | Lester Emerson | 13 | Son | — | South Dakota |
| 37 | Robert J. Robertson THIS PERSON | 62 | Head | Farmer | South Dakota |
| 38 | Scott Albert Robertson | 27 | Son | Farm Laborer | South Dakota |
| 39 | Evelyn Robertson | 28 | Housekeeper | — | South Dakota |
| 40 | Ludwig Jorgensen | 51 | Head | Farmer | 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)