LJ
Leo Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Brown-County, South Dakota
Our Model Tree links this Leo Johnson across the 1930 and 1940 US Censuses in Brown-County, South Dakota (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 7-person household.
Age 21
b. ~1919
Male
Son
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Brown-County, South Dakota |
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Portage Township |
| 1935 Residence (County) | Brown |
| Additional Details | |
| Occupation | Laborer |
| Industry | farm work |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 215 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Laborer |
| Township / Ward | Portage Township |
| Est. Birth Year | ~1919 |
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 Leo | Age | Birth yr |
|---|---|---|---|---|
| Doris Johnson | Daughter | — | 18 | ~1922 |
| Leo Johnson | Son | — | 21 | ~1919 |
| Amanda Johnson | Spouse | — | 53 | ~1887 |
| Lois Johnson | Daughter | — | 15 | ~1925 |
| Virginia Johnson | Daughter | — | 11 | ~1929 |
| Everett Johnson | Son | — | 27 | ~1913 |
| Edna Johnson | Daughter | — | 24 | ~1916 |
Census Appearances
1930
Brown, South …
Son, age 11
Brown, South Dakota · implied b. ~1919 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Age at First Marriage | 18 |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Brown-County, South …
Son, age 21
Brown-County, South Dakota · implied b. ~1919 — 7 household members
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Portage Township |
| 1935 Residence (County) | Brown |
| Occupation | Laborer |
| Industry | farm work |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 215 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| 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 Leo Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Leo Johnson
Son · 1940 · age 21 · b. ~1919 · South Dakota
★ You are viewing this record
Sibling
Edna Johnson
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Johnson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Everett Johnson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Johnson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Johnson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Brown-County, South Dakota
Open full size
1940 US Federal Census — Brown-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03849-00812)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Amanda Johnson | 53 | wife | — | Iowa |
| 2 | Everett Johnson | 27 | son | — | South Dakota |
| 3 | Edna Johnson | 24 | daughter | House Work | South Dakota |
| 4 | Leo Johnson THIS PERSON | 21 | son | Laborer | South Dakota |
| 5 | Doris M. Johnson | 18 | daughter | — | South Dakota |
| 6 | Lois Johnson | 15 | daughter | — | South Dakota |
| 7 | Virginia Johnson | 11 | daughter | — | South Dakota |
| 8 | Frank Robison | 62 | Head | Farmer | Iowa |
| 9 | Alice Robison | 62 | wife | — | Iowa |
| 10 | Lelia Loken | 25 | Boarder | Teacher | South Dakota |
| 11 | Dick Lemcke | 48 | Head | Farmer | South Dakota |
| 12 | Rosa Lemcke | 46 | wife | — | South Dakota |
| 13 | Harland Lemcke | 22 | son | Welding | South Dakota |
| 14 | Earnest Lemcke | 16 | son | Scholar | South Dakota |
| 15 | Charles Stottler | 47 | Head | Farmer | Illinois |
| 16 | Gladys Stottler | 43 | wife | — | Illinois |
| 17 | Mary Ann Stottler | 15 | daughter | — | South Dakota |
| 18 | John Pikkarainen | 63 | Head | Laborer | Michigan |
| 19 | Elina Pikkarainen | 59 | wife | — | Finland |
| 20 | Victor Mustaja | 34 | Head | Laborer | South Dakota |
| 21 | Lempi Mustaja | 29 | wife | — | North Dakota |
| 22 | Memmie Mustaja | 11 | daughter | — | South Dakota |
| 23 | Leonard Mustaja | 9 | son | — | South Dakota |
| 24 | Gerald Mustaja | 6 | son | — | South Dakota |
| 25 | Ralph Mustaja | 5 | son | — | South Dakota |
| 26 | Mavis Mustaja | 2 | daughter | — | South Dakota |
| 27 | Albert Swearingen | 29 | Head | Farmer | South Dakota |
| 28 | Marion Swearingen | 21 | wife | — | South Dakota |
| 29 | Vernon Swearingen | 2 | son | — | South Dakota |
| 30 | Dick Bruggemann | 54 | Head | Farmer | Germany |
| 31 | Paul Schroeder | 30 | Head | Farmer | Nebraska |
| 32 | Eda Schroeder | 23 | wife | — | South Dakota |
| 33 | Delores K. Schroeder | 4 | daughter | — | South Dakota |
| 34 | Lyle Schroeder | 2 | son | — | South Dakota |
| 35 | Ralph Schroeder | 1 | son | — | South Dakota |
| 36 | Jake Rueny | 43 | Head | Farmer | Illinois |
| 37 | Chris Bluemer | 53 | Head | Farmer | Switzerland |
| 38 | Frank Knowles | 55 | Head | Farmer | Wisconsin |
| 39 | Florence Knowles | 53 | wife | — | South Dakota |
| 40 | John Bernard | 40 | Head | Farmer | North 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)