FJ
Frederick Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Moody-County, South Dakota
Our Model Tree links this Frederick Johnson across the 1920, 1930 and 1940 US Censuses in Moody-County, South Dakota (XGBoost, ~Confirmed), with identified parents Adolph — first a son (b.~1905), then head of a 3-person household.
Age 35
b. ~1905
Male
Son
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Moody-County, South Dakota |
| Surname | Johnson |
| Given Name | Frederick C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Blinsmon township |
| 1935 Residence (County) | Moody |
| Additional Details | |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 866 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Farm Laborer |
| Township / Ward | Blinsmon Township |
| Est. Birth Year | ~1905 |
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 Frederick | Age | Birth yr |
|---|---|---|---|---|
| Adolph Johnson | Head | — | 65 | ~1875 |
| Frederick Johnson | Son | — | 35 | ~1905 |
| Leonard Johnson | Son | — | 28 | ~1912 |
Census Appearances
1920
Moody, South …
Son, age 15
Moody, South Dakota · implied b. ~1905 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Michigan |
| Mother's Birthplace | South Dakota |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Moody, South …
Son, age 25
Moody, South Dakota · implied b. ~1905 — 20 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Frederick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Michigan |
| Mother's Birthplace | South Dakota |
| Occupation | Teacher |
| Industry | Instrumental Music |
| Class of Worker | O |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Moody-County, South …
Son, age 35
Moody-County, South Dakota · implied b. ~1905 — 3 household members
| Surname | Johnson |
| Given Name | Frederick C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Blinsmon township |
| 1935 Residence (County) | Moody |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 866 |
| Highest Grade | Hs 2 |
| 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 Frederick Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Adolph Johnson (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Adolph Johnson
b. ~1875
Source father
● Household
· direct · ~0.92
This person
Anchor record
Frederick Johnson
Son · 1940 · age 35 · b. ~1905 · South Dakota
★ You are viewing this record
Sibling
Leonard Johnson
Sibling · 1940 · age 28
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 — Moody-County, South Dakota
Open full size
1940 US Federal Census — Moody-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03865-00015)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Oliver P. Larson | 29 | Head | Farmer | Nebraska |
| 2 | John Dart | 39 | Hired hand | Farmer | Iowa |
| 3 | Verryl Dart | 19 | Hired hand | Housekeeper | South Dakota |
| 4 | Lawrence R. De Bruin | 27 | Head | Farmer | Iowa |
| 5 | Fern De Bruin | 26 | Wife | — | South Dakota |
| 6 | Laurity A. Larson | 51 | Head | Farmer | Denmark |
| 7 | Marie Larson | 47 | Wife | — | Denmark |
| 8 | Louis M. Larson | 16 | Son | — | South Dakota |
| 9 | Ivan A. Larson | 14 | Son | — | South Dakota |
| 10 | Edith N. Larson | 13 | Daughter | — | South Dakota |
| 11 | Otto Hoyer | 40 | Head | Farmer | Denmark |
| 12 | Mary K. Hoyer | 34 | Wife | — | Denmark |
| 13 | Myrtle M. Hoyer | 5 | Daughter | — | South Dakota |
| 14 | Marilyn M. Hoyer | 1 | Daughter | — | South Dakota |
| 15 | Peter Christiansen | 49 | Head | Farmer | Denmark |
| 16 | C. Florence Christiansen | 34 | Wife | — | South Dakota |
| 17 | Robert P. Christiansen | 9 | Son | — | South Dakota |
| 18 | Alfred Peterson | 56 | Head | Farmer | Denmark |
| 19 | Caroline Peterson | 52 | Wife | — | South Dakota |
| 20 | Melvin Peterson | 26 | Son | Farmer | South Dakota |
| 21 | Reuben A. Peterson | 25 | Son | Waiter | South Dakota |
| 22 | Henry Mudder | 35 | Head | Farmer | Germany |
| 23 | Anna Mudder | 35 | Wife | — | Germany |
| 24 | Ralph Mudder | 6 | Son | — | South Dakota |
| 25 | Helen Mudder | 5 | Daughter | — | South Dakota |
| 26 | Henrietta Uhden | 74 | Mother-in-law | — | Germany |
| 27 | Adolph A. Johnson | 65 | Head | Farmer | Michigan |
| 28 | Frederick C. Johnson THIS PERSON | 35 | Son | Farm Laborer | South Dakota |
| 29 | Leonard A. Johnson | 28 | Son | Rural Teacher | South Dakota |
| 30 | Curtis L. Hilland | 26 | Head | Farm Laborer | Nebraska |
| 31 | Ruth Hilland | 23 | Wife | — | Michigan |
| 32 | Maxine Hilland | 5 | Daughter | — | Nebraska |
| 33 | Marilyn Hilland | 3 | Daughter | — | Nebraska |
| 34 | La Monte Hilland | 1 | Son | — | Nebraska |
| 35 | Bertha Schroeder | 56 | Mother-in-law | Housework | Iowa |
| 36 | Paul Schroeder | 15 | Brother-in-law | — | Nebraska |
| 37 | Marie Jacobson | 55 | Head | — | Denmark |
| 38 | Howard C. Jacobson | 19 | Son | Farmer | Iowa |
| 39 | Marius Hansen | 50 | Brother | Farm Laborer | Denmark |
| 40 | Nels Sorenson | 40 | Head | Farmer | South Dakota |
Related Census Records
Pedigree Summary
Frederick + 1 sibling
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)