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Jens Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sully-County, South Dakota
Our Model Tree links this Jens Jensen across the 1920, 1930 and 1940 US Censuses in Sully-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1894), then head of a 9-person household.
Age 46
b. ~1894
Male
Head
Born: Denmark
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Sully-County, South Dakota |
| Surname | Jensen |
| Given Name | Jens C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Pearl Township |
| 1935 Residence (County) | Sully |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Occupation | Farmer |
| Township / Ward | Pearl Township |
| Est. Birth Year | ~1894 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jens | Age | Birth yr |
|---|---|---|---|---|
| Vada Jensen | Spouse | — | 35 | ~1905 |
| Iva Jensen | Daughter | — | 3 | ~1937 |
| Betty Jensen | Daughter | — | 9 | ~1931 |
| Glen Jensen | Daughter | — | 13 | ~1927 |
| Gertrude Jensen | Daughter | — | 7 | ~1933 |
| Agnes Jensen | Daughter | — | 11 | ~1929 |
| Arthur Jensen | Son | — | 17 | ~1923 |
| Jens Jensen | Head | — | 46 | ~1894 |
| Duane Jensen | Son | — | ~1940 |
Census Appearances
1920
Hennepin, Minnesota
Other, age 26
Hennepin, Minnesota · implied b. ~1894 — 23 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens K |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Denmark |
| Year of Immigration | 1916 |
| Naturalization Status | Alien |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Laborer |
| Industry | Construction |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1930
Sully, South …
Other, age 36
Sully, South Dakota · implied b. ~1894 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Jens C. |
| Relationship to Head | R |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1907 |
| Age at First Marriage | 28 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Radio Set | Yes |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Sully-County, South …
Head, age 46
Sully-County, South Dakota · implied b. ~1894 — 9 household members
| Surname | Jensen |
| Given Name | Jens C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Denmark |
| 1935 Residence (City) | Pearl Township |
| 1935 Residence (County) | Sully |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| 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 Jens Jensen across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jens Jensen
Head · 1940 · age 46 · b. ~1894 · 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 — Sully-County, South Dakota
Open full size
1940 US Federal Census — Sully-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03868-00041)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jacob G Heischedel | 78 | Head | Farmer | Iowa |
| 2 | Jacob G Jr Heischedel | 52 | Son | Farmer | Iowa |
| 3 | Mary Kellogg | 45 | Servant | Servant | Iowa |
| 4 | Frankie Kellogg | 18 | Son | Farm Laborer | South Dakota |
| 5 | Paul Kellogg | 14 | Son | — | South Dakota |
| 6 | Roy A Teeter | 45 | Head | Farmer | South Dakota |
| 7 | Alice Teeter | 40 | Wife | — | South Dakota |
| 8 | Phyllis M Teeter | 18 | Daughter | Stenographer | South Dakota |
| 9 | Arlene L Teeter | 9 | Daughter | — | South Dakota |
| 10 | D. Milford Brann | 52 | Head | Farmer | Kentucky |
| 11 | Nora E Brann | 52 | Wife | — | Iowa |
| 12 | Madge L Brann | 13 | Daughter | — | South Dakota |
| 13 | John H Herman | 24 | Hired Hand | Farm Laborer | Illinois |
| 14 | John Hickey | 67 | Head | Farmer | Irish Free State |
| 15 | Flora Hickey | 60 | Wife | — | Pennsylvania |
| 16 | William W Heischedel | 42 | Head | Farmer | Iowa |
| 17 | Phyllis M Heischedel | 32 | Wife | — | Nebraska |
| 18 | Velma L Heischedel | 15 | Daughter | — | South Dakota |
| 19 | Raymond W Heischedel | 13 | Son | — | South Dakota |
| 20 | Rosalie R Heischedel | 9 | Daughter | — | South Dakota |
| 21 | Conrad Heischedel | 6 | Son | — | South Dakota |
| 22 | Blanche Crawford | 23 | Lodger | School Teacher | South Dakota |
| 23 | Gordon Dail | 49 | Head | Farmer | Missouri |
| 24 | Sylvia Dail | 41 | Wife | — | Wisconsin |
| 25 | Lois R Dail | 5 | Daughter | — | South Dakota |
| 26 | Leslie G Dail | 1 | Son | — | South Dakota |
| 27 | Anna L Estell | 72 | Mother-in-law | — | Wisconsin |
| 28 | Willard E Estell | 46 | Brother-in-law | Farm Laborer | Wisconsin |
| 29 | Keith E Estell | 36 | Brother-in-law | Farm Laborer | Wisconsin |
| 30 | Jens C Jensen THIS PERSON | 46 | Head | Farmer | Denmark |
| 31 | Vada L Jensen | 35 | Wife | — | Nebraska |
| 32 | Arthur E Jensen | 17 | Son | Farm Laborer | South Dakota |
| 33 | Glen L Jensen | 13 | Daughter | — | South Dakota |
| 34 | Agnes F Jensen | 11 | Daughter | — | South Dakota |
| 35 | Betty R Jensen | 9 | Daughter | — | South Dakota |
| 36 | Gertrude D Jensen | 7 | Daughter | — | South Dakota |
| 37 | Iva H Jensen | 3 | Daughter | — | South Dakota |
| 38 | Duane Jensen | 0 | Son | — | South Dakota |
| 39 | Leonard W Triboulet | 41 | Head | Farmer | Iowa |
| 40 | Ethel M Triboulet | 43 | Wife | — | Iowa |
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)