JL
John Larsen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Roberts-County, South Dakota
Our Model Tree links this John Larsen across the 1930 and 1940 US Censuses in Roberts-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 10-person household.
Age 48
b. ~1892
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Roberts-County, South Dakota |
| Surname | Larsen |
| Given Name | John C. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Roberts Co Dakota |
| 1935 Residence (County) | Roberts |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farm Operator |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | South Dakota |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farm Operator |
| Township / Ward | Lee |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marie Larsen | Spouse | — | 50 | ~1890 |
| Duane Larsen | Son | — | 5 | ~1935 |
| Elton Larsen | Son | — | 19 | ~1921 |
| John Larsen | Head | — | 48 | ~1892 |
| Merle Larsen | Son | — | 11 | ~1929 |
| Leonard Larsen | Son | — | 24 | ~1916 |
| Quentin Larsen | Son | — | 8 | ~1932 |
| Kenneth Larsen | Son | — | 15 | ~1925 |
| Deloris Larsen | Daughter | — | 10 | ~1930 |
| Evelyn Larsen | Daughter | — | 18 | ~1922 |
Census Appearances
Head, age 38
Roberts, South Dakota · implied b. ~1892 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 20 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Gen. Farm |
| Class of Worker | E |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | R |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Roberts-County, South …
Head, age 48
Roberts-County, South Dakota · implied b. ~1892 — 10 household members
| Surname | Larsen |
| Given Name | John C. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Roberts Co Dakota |
| 1935 Residence (County) | Roberts |
| Naturalization Status | Naturalized |
| Occupation | Farm Operator |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | South Dakota |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
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 Larsen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Larsen
Head · 1940 · age 48 · b. ~1892 · South Dakota
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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 — Roberts-County, South Dakota
Open full size
1940 US Federal Census — Roberts-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03866-00718)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Flora Johansen | 6 | neice | — | South Dakota |
| 42 | Terry Johansen | 4 | Nephew | — | South Dakota |
| 43 | Marlene Johansen | 0 | neice | — | Minnesota |
| 44 | John C. Larsen THIS PERSON | 48 | head | Farm Operator | Denmark |
| 45 | Marie Larsen | 50 | wife | — | Denmark |
| 46 | Elton Larsen | 19 | son | Farm Operator | South Dakota |
| 47 | Leonard Larsen | 24 | son | Laborer | South Dakota |
| 48 | Evelyn Larsen | 18 | daughter | — | South Dakota |
| 49 | Kenneth Larsen | 15 | son | Laborer | South Dakota |
| 50 | Merle Larsen | 11 | son | — | South Dakota |
| 51 | Deloris Larsen | 10 | daughter | — | South Dakota |
| 52 | Quentin Larsen | 8 | son | — | South Dakota |
| 53 | Duane Larsen | 5 | son | — | South Dakota |
| 54 | Fred Christensen | 71 | head | Farm Operator | Denmark |
| 55 | Margreth Christensen | 65 | wife | — | Denmark |
| 56 | Earl Bassett | 60 | head | Farm Operator | Minnesota |
| 57 | Amelia Bassett | 57 | wife | — | Germany |
| 58 | Kenneth Bassett | 33 | son | Farm Operator | Minnesota |
| 59 | Mable Bassett | 33 | daughter-in-law | — | South Dakota |
| 60 | Don Bassett | 10 | grandson | — | South Dakota |
| 61 | Dean Bassett | 7 | grandson | — | South Dakota |
| 62 | John F. Mc Guckin | 75 | head | Farm Operator | Wisconsin |
| 63 | Laura M. Mc Guckin | 72 | wife | — | Wisconsin |
| 64 | Howard Amdahl | 24 | head | Laborer | South Dakota |
| 65 | Walter E. Bassett | 31 | head | Farm Operator | South Dakota |
| 66 | Louella Bassett | 31 | wife | — | South Dakota |
| 67 | Gareth Bassett | 6 | son | — | South Dakota |
| 68 | Clarence Langworthy | 66 | head | Farm Operator | Minnesota |
| 69 | Mary Langworthy | 52 | wife | — | South Dakota |
| 70 | Marjorie Langworthy | 27 | daughter | Teacher | South Dakota |
| 71 | Marilyn Langworthy | 21 | daughter | Teacher | South Dakota |
| 72 | Robert Langworthy | 18 | son | — | South Dakota |
| 73 | Everett Wilkie | 33 | head | Farm Operator | Iowa |
| 74 | Mildred Wilkie | 31 | wife | — | South Dakota |
| 75 | Lynn Wilkie | 1 | son | — | Minnesota |
| 76 | Florence Nowell | 28 | lodger | Teacher | South Dakota |
| 77 | Henry Madsen | 32 | hired hand | Laborer | South Dakota |
| 78 | Chris J. Christensen | 30 | head | Farm Operator | South Dakota |
| 79 | Gladys Christensen | 36 | wife | — | South Dakota |
| 80 | Dale Christensen | 5 | son | — | South Dakota |
Related Census Records
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)