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Robert Williamson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cascade-County, Montana
Our Model Tree links this Robert Williamson across the 1920, 1930 and 1940 US Censuses in Cascade-County, Montana (XGBoost, ~Confirmed), with identified parents Bernard & Samuel — first a son (b.~1913), then head of a 6-person household.
Age 27
b. ~1913
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cascade-County, Montana |
| Surname | Williamson |
| Given Name | Robert J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (County) | Cascade |
| Additional Details | |
| Occupation | 7 |
| Industry | Driver |
| Class of Worker | Coal Mine |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | 7 |
| Township / Ward | Belt City |
| Est. Birth Year | ~1913 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Williamson | Son | — | 27 | ~1913 |
| Samuel Williamson | Son | — | 22 | ~1918 |
| Bartholomew Williamson | Son | — | 16 | ~1924 |
| Samuel Williamson | Head | — | 62 | ~1878 |
| Mary Williamson | Spouse | — | 60 | ~1880 |
| Nona Williamson | Daughter | — | 25 | ~1915 |
Census Appearances
1920
Cascade, Montana
Son, age 7
Cascade, Montana · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Speaks English | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Cascade, Montana
Son, age 18
Cascade, Montana · implied b. ~1912 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Cascade-County, Montana
Son, age 27
Cascade-County, Montana · implied b. ~1913 — 6 household members
| Surname | Williamson |
| Given Name | Robert J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (County) | Cascade |
| Occupation | 7 |
| Industry | Driver |
| Class of Worker | Coal Mine |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 Williamson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Bernard Williamson (~0.92 confidence) and father Samuel Williamson (~0.92 confidence) and father Samuel Williamson (~0.92 confidence) and mother Mary Williamson (~0.92 confidence) and mother Mary Williamson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Bernard Williamson
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Samuel Williamson
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Samuel Williamson
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Mary Williamson
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Mary Williamson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Williamson
Son · 1940 · age 27 · b. ~1913 · Montana
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Sibling
Samuel Williamson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bartholomew Williamson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nona Williamson
Sibling · 1940 · age 25
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 — Cascade-County, Montana
Open full size
1940 US Federal Census — Cascade-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02215-00283)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Phyllis M. Jabroski | 2 | Daughter | — | Montana |
| 42 | Thomas R. Thompson | 50 | Head | — | England |
| 43 | Lester L. Brodie | 45 | Head | 40 | Montana |
| 44 | Dolyne Brodie | 32 | Wife | — | Idaho |
| 45 | Samuel R. Williamson | 62 | Head | 36 | Iowa |
| 46 | Mary A. Williamson | 60 | Wife | — | Indiana |
| 47 | Robert J. Williamson THIS PERSON | 27 | Son | 7 | Montana |
| 48 | Nona A. Williamson | 25 | Daughter | 32 | Montana |
| 49 | Samuel E. Jr. Williamson | 22 | Son | 8 | Montana |
| 50 | Bartholomew B. Williamson | 16 | Son | — | Montana |
| 51 | William J. Thompson | 73 | Head | — | England |
| 52 | Everett Turen | 67 | Head | — | Finland |
| 53 | Sophie Turen | 58 | Wife | — | Finland |
| 54 | Gertrude H. Turen | 18 | Daughter | 24 | Montana |
| 55 | Nicola Imovir | 65 | Head | Laborer | Croatia |
| 56 | Mary Imovir | 63 | Wife | — | Croatia |
| 57 | Harold W. Luck | 28 | Head | 3 | Montana |
| 58 | M. Pauline Luck | 22 | Wife | — | Montana |
| 59 | Harold W. Jr. Luck | 2 | Son | — | Montana |
| 60 | Honora E. Luck | 0 | Daughter | — | Montana |
| 61 | Mathias Havericity | 76 | Head | — | Slovakia |
| 62 | Emma M. Havericity | 31 | Daughter | — | Montana |
| 63 | Math (Mike) Geday | 79 | Head | — | Slovakia |
| 64 | Edward M. Johnson | 46 | Head | 36 | Montana |
| 65 | Maxine M. Johnson | 3 | Daughter | — | Montana |
| 66 | Ida Peters | 76 | Mother | — | Finland |
| 67 | Gottlieb Ryffel | 59 | Head | Proprietor | Switzerland |
| 68 | John J. Ryffel | 27 | Son | 48 | Minnesota |
| 69 | Henry H. Ryffel | 23 | Son | 48 | Montana |
| 70 | Erna A. (Ab) Ryffel | 21 | Daughter | — | Montana |
| 71 | George (Ab) Ryffel | 20 | Son | — | Minnesota |
| 72 | Alma L. Ryffel | 17 | Daughter | — | Montana |
| 73 | Mary L. Ryffel | 13 | Daughter | — | Montana |
| 74 | Robert Ryffel | 11 | Son | — | Montana |
| 75 | James P. Ryffel | 6 | Son | — | Montana |
| 76 | Erna L. Ryffel | 44 | Wife | 18 | Minnesota |
| 77 | Esther C. Reed | 52 | Head | — | Minnesota |
| 78 | James A. Reed | 17 | Son | — | Montana |
| 79 | Calvin L. Reed | 13 | Son | — | Montana |
| 80 | James D. Brodie | 79 | Head | — | England |
Pedigree Summary
Robert + 3 siblings
Gen 1 · 5 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)