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John Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sully-County, South Dakota
Our Model Tree links this John Mason across the 1920, 1930 and 1940 US Censuses in Sully-County, South Dakota (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 4-person household.
Age 69
b. ~1871
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Sully-County, South Dakota |
| Surname | Mason |
| Given Name | John D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Pierre |
| 1935 Residence (County) | Hughes |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | South Dakota |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Farmer |
| Township / Ward | Onida |
| Est. Birth Year | ~1871 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Clara Mason | Daughter | — | 5 | ~1935 |
| John Mason | Head | — | 69 | ~1871 |
| Ross Mason | Son | — | 3 | ~1937 |
| Emily Mason | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Sully, South …
Head, age 49
Sully, South Dakota · implied b. ~1871 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1887 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Scotland |
| Year of Naturalization | 1896 |
| Birthplace (normalized) | scotland |
1930
Sully, South …
Head, age 59
Sully, South Dakota · implied b. ~1871 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1901 |
| Age at First Marriage | 26 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Farmer |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Sully-County, South …
Head, age 69
Sully-County, South Dakota · implied b. ~1871 — 4 household members
| Surname | Mason |
| Given Name | John D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Pierre |
| 1935 Residence (County) | Hughes |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | South Dakota |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Mason
Head · 1940 · age 69 · b. ~1871 · 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
39 people indexed on this census page (nara:1940:m-t0627-03868-00037)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marjorie Kitchen | 12 | Niece | — | South Dakota |
| 42 | Lila Blaisdell | 3 | Daughter | — | South Dakota |
| 43 | Leah Blaisdell | 1 | Daughter | — | South Dakota |
| 44 | Al Cunningham | 57 | Head | Farmer | Iowa |
| 45 | Ida Cunningham | 57 | Wife | — | South Dakota |
| 46 | Al Clayton | 21 | Son | Farmer | South Dakota |
| 47 | Ed Van Voorhis | 62 | Head | Farmer | Wisconsin |
| 48 | Anna Van Voorhis | 54 | Wife | — | Wisconsin |
| 49 | Victor Van Voorhis | 20 | Son | — | South Dakota |
| 50 | William Oatcamp | 18 | Hired man | Farming | South Dakota |
| 52 | Leita R Byrum | 41 | Wife | — | Wisconsin |
| 53 | Carol Mae Byrum | 19 | Daughter | — | South Dakota |
| 54 | Forrest Earl Byrum | 10 | Son | — | South Dakota |
| 55 | John Fredrick Byrum | 6 | Son | — | South Dakota |
| 56 | Susan Hester Beaton | 82 | Mother-in-law | — | Wisconsin |
| 57 | Walter H Beckman | 55 | Head | Farming | Iowa |
| 58 | Harry Beckman | 54 | Brother | Farming | Iowa |
| 59 | Carrie Workman | 61 | Sister | — | Iowa |
| 60 | John D Mason THIS PERSON | 69 | Head | Farmer | Scotland |
| 61 | Emily H Mason | 39 | Wife | — | Minnesota |
| 62 | Clara Jane Mason | 5 | Daughter | — | South Dakota |
| 63 | Ross Jacob Mason | 3 | Son | — | South Dakota |
| 64 | Albert Gordon | 57 | Head | Farmer | Maine |
| 65 | Arla Gordon | 52 | Wife | — | South Dakota |
| 66 | Agnes A Gordon | 20 | Daughter | — | South Dakota |
| 67 | David Gordon | 15 | Son | — | South Dakota |
| 68 | Katherine Schumacher | 43 | Head | — | Russia |
| 69 | Florence Schumacher | 20 | Daughter | — | South Dakota |
| 70 | Marvin Schumacher | 16 | Son | — | South Dakota |
| 71 | Henry Schumacher | 14 | Son | — | South Dakota |
| 72 | Katherine Schumacher | 12 | Daughter | — | South Dakota |
| 73 | Ruby Schumacher | 10 | Daughter | — | South Dakota |
| 74 | Robert Schumacher | 7 | Son | — | South Dakota |
| 75 | Leroy Schumacher | 5 | Son | — | South Dakota |
| 76 | Mary June Schumacher | 3 | Daughter | — | South Dakota |
| 77 | John Allison | 37 | Head | Garage Work | South Dakota |
| 78 | Ellen Allison | 28 | Wife | — | South Dakota |
| 79 | Alvin Allison | 10 | Son | — | South Dakota |
| 80 | Norman Allison | 5 | Son | — | South 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)