RM
Robert Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hyde-County, South Dakota
Our Model Tree links this Robert Mason across the 1920, 1930 and 1940 US Censuses in Hyde-County, South Dakota (XGBoost, ~Confirmed), with identified parents Frank & Martha — first a son (b.~1919), then head of a 10-person household.
Age 21
b. ~1919
Male
Son
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hyde-County, South Dakota |
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Hyde |
| Additional Details | |
| Occupation | Assistant Maintainer |
| Industry | County Government |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 320 |
| Highest Grade | Hs 4 |
| 1935 Residence | South Dakota |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Assistant Maintainer |
| Township / Ward | Highmore City |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Evelynne Mason | Daughter | — | 5 | ~1935 |
| Mary Mason | Daughter | — | 14 | ~1926 |
| Phyllis Mason | Daughter | — | 7 | ~1933 |
| Frank Mason | Head | — | 51 | ~1889 |
| Donald Mason | Son | — | 12 | ~1928 |
| Raymond Mason | Son | — | 16 | ~1924 |
| Arthur Mason | Son | — | 8 | ~1932 |
| Russel Mason | Son | — | 10 | ~1930 |
| Robert Mason | Son | — | 21 | ~1919 |
| Martha Mason | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Hyde, South …
Son, age 1
Hyde, South Dakota · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Colorado |
| Occupation | none |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Hyde, South …
Son, age 11
Hyde, South Dakota · implied b. ~1919 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Robert R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Colorado |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Hyde-County, South …
Son, age 21
Hyde-County, South Dakota · implied b. ~1919 — 10 household members
| Surname | Mason |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Hyde |
| Occupation | Assistant Maintainer |
| Industry | County Government |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 320 |
| Highest Grade | Hs 4 |
| 1935 Residence | South Dakota |
| 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 Robert Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Mason (~0.92 confidence) and mother Martha Mason (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Mason
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Martha Mason
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Mason
Son · 1940 · age 21 · b. ~1919 · South Dakota
★ You are viewing this record
Sibling
Evelynne Mason
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phyllis Mason
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Mason
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Mason
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Mason
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mason
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russel Mason
Sibling · 1940 · age 10
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 — Hyde-County, South Dakota
Open full size
1940 US Federal Census — Hyde-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03858-00445)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Swanson | 2 | Son | — | South Dakota |
| 2 | Wayne Swanson | 44 | Head | Banker | South Dakota |
| 3 | Louise Swanson | 40 | Wife | — | Kansas |
| 4 | Richard Swanson | 11 | Son | — | South Dakota |
| 5 | Karen Swanson | 2 | Daughter | — | South Dakota |
| 6 | Lial Swanson | 47 | Head | Farmer | South Dakota |
| 7 | Loretta Swanson | 39 | Wife | — | Iowa |
| 8 | Maxine Swanson | 16 | Daughter | — | South Dakota |
| 9 | Charles Swanson | 15 | Son | — | South Dakota |
| 10 | Merrie Swanson | 11 | Daughter | — | South Dakota |
| 11 | Harriett Swanson | 8 | Daughter | — | South Dakota |
| 12 | James A. Rubendall | 57 | Head | Deliveryman | Illinois |
| 13 | Mabel Rubendall | 54 | Wife | Clerk | Illinois |
| 14 | Quentin Rubendall | 20 | Son | Clerk | South Dakota |
| 15 | Philip Wabery | 69 | Head | — | Illinois |
| 16 | Gladys Wabery | 66 | Wife | — | Wisconsin |
| 17 | Frank Mason | 51 | Head | Highway Maintainer | South Dakota |
| 18 | Martha Mason | 50 | Wife | — | Colorado |
| 19 | Robert Mason THIS PERSON | 21 | Son | Assistant Maintainer | South Dakota |
| 20 | Raymond Mason | 16 | Son | — | South Dakota |
| 21 | Mary Mason | 14 | Daughter | — | South Dakota |
| 22 | Donald Mason | 12 | Son | — | South Dakota |
| 23 | Russel Mason | 10 | Son | — | South Dakota |
| 24 | Arthur Mason | 8 | Son | — | South Dakota |
| 25 | Phyllis Mason | 7 | Daughter | — | South Dakota |
| 26 | Evelynne Mason | 5 | Daughter | — | South Dakota |
| 27 | Ray Ellickson | 45 | Head | Printer | Minnesota |
| 28 | Lydia Ellickson | 35 | Wife | — | South Dakota |
| 29 | Norma Rae Ellickson | 10 | Daughter | — | South Dakota |
| 30 | Susan Lynn Ellickson | 0 | Daughter | — | Iowa |
| 31 | Oscar Newton | 60 | Head | Merchant | Michigan |
| 32 | Robert Newton | 19 | Son | Clerk | South Dakota |
| 33 | Rosena Pahl | 80 | Head | — | Wisconsin |
| 34 | Laura Pahl | 51 | Daughter | — | South Dakota |
| 35 | Albert Gerth | 75 | Brother | — | Wisconsin |
| 36 | Austin Meigs | 56 | Head | — | South Dakota |
| 37 | Eunice Meigs | 52 | Wife | — | South Dakota |
| 38 | Merrill Meigs | 21 | Son | — | South Dakota |
| 39 | Elizabeth Hague | 48 | Head | — | South Dakota |
| 40 | Mildred Hague | 18 | Daughter | — | South Dakota |
Related Census Records
Pedigree Summary
Robert + 7 siblings
Gen 1 · 2 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)