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Robert Williamson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Madison-County, Indiana
Our Model Tree links this Robert Williamson across the 1920, 1930 and 1940 US Censuses in Madison-County, Indiana (XGBoost, ~Confirmed), with identified parents Herbert & Robert — first a son (b.~1917), then head of a 13-person household.
Age 23
b. ~1917
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Madison-County, Indiana |
| Surname | Williamson |
| Given Name | Robert L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Anderson city |
| 1935 Residence (County) | Madison |
| Additional Details | |
| Occupation | Inspector |
| Industry | Auto Parts Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1254 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Inspector |
| Township / Ward | Anderson City |
| Est. Birth Year | ~1917 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Charles Williamson | Son | — | 10 | ~1930 |
| Mary Williamson | Daughter | — | 15 | ~1925 |
| Herbert Williamson | Son | — | 17 | ~1923 |
| Richard Williamson | Son | — | 9 | ~1931 |
| Jack Williamson | Son | — | 3 | ~1937 |
| Robert Williamson | Son | — | 23 | ~1917 |
| Herbert Williamson | Head | — | 42 | ~1898 |
| Harry Williamson | Son | — | 5 | ~1935 |
| Nancy Williamson | Daughter | — | 8 | ~1932 |
| Marion Williamson | Spouse | — | 42 | ~1898 |
| George Williamson | Son | — | 12 | ~1928 |
| Mark Williamson | Son | — | 21 | ~1919 |
| James Williamson | Son | — | 18 | ~1922 |
Census Appearances
1920
Madison, Indiana
Son, age 3
Madison, Indiana · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Robert L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Madison, Indiana
Son, age 13
Madison, Indiana · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Robert R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Madison-County, Indiana
Son, age 23
Madison-County, Indiana · implied b. ~1917 — 13 household members
| Surname | Williamson |
| Given Name | Robert L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Anderson city |
| 1935 Residence (County) | Madison |
| Occupation | Inspector |
| Industry | Auto Parts Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1254 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Herbert Williamson (~0.92 confidence) and father Robert Williamson (~0.92 confidence) and mother Marian Williamson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Herbert Williamson
b. ~1898
Source father
● Household
· direct · ~0.92
Father
Robert Williamson
b. ~1897
Source father
● Household
· direct · ~0.92
Mother
Marian Williamson
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Williamson
Son · 1940 · age 23 · b. ~1917 · Indiana
★ You are viewing this record
Sibling
Harry Williamson
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mark Williamson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Williamson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Williamson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Williamson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Williamson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Williamson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Williamson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Williamson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Williamson
Sibling · 1940 · age 3
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 — Madison-County, Indiana
Open full size
1940 US Federal Census — Madison-County, Indiana
Page Contents
17 people indexed on this census page (nara:1940:m-t0627-01072-00371)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | B. Pritchard | 9 | son | — | Kentucky |
| 2 | Mitchell J. Pritchard | 7 | son | — | Kentucky |
| 3 | Marvin J. Pritchard | 4 | son | — | Kentucky |
| 4 | Martha J. Pritchard | 2 | daughter | — | Indiana |
| 5 | Herbert E. Williamson | 42 | head | Stationary Fireman | Indiana |
| 6 | Marion E. Williamson | 42 | wife | H | Indiana |
| 7 | Robert L. Williamson THIS PERSON | 23 | son | Inspector | Indiana |
| 8 | Mark C. Williamson | 21 | son | Basement Helper | Indiana |
| 9 | James H. Williamson | 18 | son | S | Indiana |
| 10 | Herbert F. Williamson | 17 | son | S | Indiana |
| 11 | Mary P. Williamson | 15 | daughter | S | Indiana |
| 12 | George P. Williamson | 12 | son | — | Indiana |
| 13 | Charles W. Williamson | 10 | son | — | Indiana |
| 14 | Richard G. Williamson | 9 | son | — | Indiana |
| 15 | Nancy C. Williamson | 8 | daughter | — | Indiana |
| 16 | Harry A. Williamson | 5 | son | — | Indiana |
| 17 | Jack G. Williamson | 3 | son | — | Indiana |
Related Census Records
Pedigree Summary
Robert + 10 siblings
Gen 1 · 3 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)