JJ
Jacob Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Day-County, South Dakota
Our Model Tree links this Jacob Johnson across the 1930 and 1940 US Censuses in Day-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1895), then head of a 7-person household.
Age 45
b. ~1895
Male
Head
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Day-County, South Dakota |
| Surname | Johnson |
| Given Name | Jacob |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Raritan |
| 1935 Residence (County) | Day |
| Additional Details | |
| Occupation | Farming |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Farming |
| Township / Ward | Raritan |
| Est. Birth Year | ~1895 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jacob | Age | Birth yr |
|---|---|---|---|---|
| Marilyn Johnson | Daughter | — | 11 | ~1929 |
| James Johnson | Son | — | 16 | ~1924 |
| Sylvia Johnson | Daughter | — | 14 | ~1926 |
| Jacob Johnson | Head | — | 45 | ~1895 |
| Carola Johnson | Daughter | — | 14 | ~1926 |
| Anna Johnson | Spouse | — | 45 | ~1895 |
| Lillian Johnson | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Day, South …
Head, age 35
Day, South Dakota · implied b. ~1895 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Jacob G. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Age at First Marriage | 25 |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Farmer |
| Industry | Grain |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Day-County, South …
Head, age 45
Day-County, South Dakota · implied b. ~1895 — 7 household members
| Surname | Johnson |
| Given Name | Jacob |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | Raritan |
| 1935 Residence (County) | Day |
| Occupation | Farming |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | No 3 |
| 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 Jacob Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jacob Johnson
Head · 1940 · age 45 · b. ~1895 · 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 — Day-County, South Dakota
Open full size
1940 US Federal Census — Day-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03854-00257)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Evelyn Rasmussen | 5 | Daughter | — | South Dakota |
| 42 | Jacob Johnson THIS PERSON | 45 | Head | Farming | South Dakota |
| 43 | Anna Johnson | 45 | Wife | — | South Dakota |
| 44 | James Johnson | 16 | Son | Laborer | South Dakota |
| 45 | Carola Johnson | 14 | Daughter | — | South Dakota |
| 46 | Sylvia Johnson | 14 | Daughter | — | South Dakota |
| 47 | Marilyn Johnson | 11 | Daughter | — | South Dakota |
| 48 | Lillian Johnson | 10 | Daughter | — | South Dakota |
| 49 | Jacob M. Bosmoe | 41 | Head | Farming | Norway |
| 50 | Nettie Bosmoe | 40 | Wife | — | South Dakota |
| 51 | Joseph L. Bosmoe | 7 | Son | — | South Dakota |
| 52 | Valborg Bosmoe | 6 | Daughter | — | South Dakota |
| 53 | Rodger A. Bosmoe | 2 | Son | — | South Dakota |
| 54 | Mary Ann Bosmoe | 0 | Daughter | — | South Dakota |
| 55 | Jacob E. Holland | 48 | Head | Farming | Norway |
| 56 | Isabelle Holland | 46 | Wife | — | Iowa |
| 57 | Sherman Holland | 21 | Son | Laborer | South Dakota |
| 58 | Emma Holland | 15 | Daughter | — | South Dakota |
| 59 | Selma Holland | 11 | Daughter | — | South Dakota |
| 60 | Serene Holland | 10 | Daughter | — | South Dakota |
| 61 | Helen Holland | 5 | Daughter | — | South Dakota |
| 62 | Selmer Landa | 24 | Head | Farming | South Dakota |
| 63 | Marian Landa | 18 | Wife | — | South Dakota |
| 64 | Harold Gutterman | 23 | Partner | Farming | South Dak |
| 65 | Helen Gutterman | 24 | Partner | — | Minnesota |
| 66 | Johanna Olson | 73 | Head | — | Norway |
| 67 | Odin Olson | 39 | Head | Farming | So Dak |
| 68 | Corinne Olson | 15 | Daughter | — | So Dak |
| 69 | Beverly Olson | 7 | Daughter | — | So Dak |
| 70 | Peter Monson | 37 | Head | Laborer | So Dak |
| 71 | Enga Monson | 38 | Wife | — | So Dak |
| 72 | Percival Monson | 9 | Son | — | So Dak |
| 73 | Elwood Monson | 7 | Son | — | So Dak |
| 74 | Arlean Monson | 4 | Daughter | — | So Dak |
| 75 | Rodger Monson | 2 | Son | — | So Dak |
| 76 | Haggie Anderson | 54 | Head | Farmer | So Dakota |
| 77 | Almina Anderson | 51 | Wife | — | So Dakota |
| 78 | Dorey Anderson | 17 | Daughter | — | So Dakota |
| 79 | Arlene Anderson | 15 | Daughter | — | So Dakota |
| 80 | Julane Anderson | 12 | Daughter | — | So 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)