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Robert Williamson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Iroquois-County, Illinois
Our Model Tree links this Robert Williamson across the 1930 and 1940 US Censuses in Iroquois-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 10-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Iroquois-County, Illinois |
| Surname | Williamson |
| Given Name | Robert L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Loda Village |
| 1935 Residence (County) | Iroquois |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Loda Village |
| Est. Birth Year | ~1926 |
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 |
|---|---|---|---|---|
| Ruth Williamson | Spouse | — | 41 | ~1899 |
| Gene Williamson | Son | — | 9 | ~1931 |
| Rosemary Williamson | Daughter | — | 10 | ~1930 |
| Betty Williamson | Daughter | — | 16 | ~1924 |
| Robert Williamson | Son | — | 14 | ~1926 |
| Cleada Williamson | Daughter | — | 12 | ~1928 |
| James Williamson | Head | — | 45 | ~1895 |
| James Williamson | Son | — | 24 | ~1916 |
| John Williamson | Son | — | 23 | ~1917 |
| Dorothy Williamson | Daughter | — | 5 | ~1935 |
Census Appearances
1930
Iroquois, Illinois
Son, age 4
Iroquois, Illinois · implied b. ~1926 — 9 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 | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Iroquois-County, Illinois
Son, age 14
Iroquois-County, Illinois · implied b. ~1926 — 10 household members
| Surname | Williamson |
| Given Name | Robert L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Loda Village |
| 1935 Residence (County) | Iroquois |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Williamson
Son · 1940 · age 14 · b. ~1926 · Illinois
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Sibling
Dorothy Williamson
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gene Williamson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Williamson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Williamson
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Williamson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleada Williamson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosemary Williamson
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 — Iroquois-County, Illinois
Open full size
1940 US Federal Census — Iroquois-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00813-00593)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth M. Stotler | 78 | aunt | Practitioner | Ohio |
| 2 | Don W. Miller | 25 | Head | Teacher-Coach | Illinois |
| 3 | Ruth J. Miller | 24 | wife | — | Illinois |
| 4 | William J. Crozier | 57 | Head | Farm Hand | Illinois |
| 5 | Carrie E. Crozier | 56 | wife | — | Illinois |
| 6 | Mabel A. Crozier | 35 | daughter | Housekeeper | Illinois |
| 7 | Walter W. Crozier | 22 | son | Helper For Contractors | Illinois |
| 8 | Beulah M. Crozier | 17 | daughter | — | Illinois |
| 9 | Orville E. Fields | 37 | Head | Ditcher | Indiana |
| 10 | Margaret M. Fields | 36 | wife | — | Illinois |
| 11 | William Fields | 15 | son | — | Illinois |
| 12 | Peter Hartman | 55 | Head | New Worker | Illinois |
| 13 | Mary Hartman | 70 | wife | — | Wisconsin |
| 14 | Matthias Mertes | 43 | stepson | New Worker | Illinois |
| 15 | Robert J. Mertes | 18 | stepson | — | Illinois |
| 16 | Horace Alsip | 57 | Head | Ditcher | Illinois |
| 17 | Mary Alsip | 49 | wife | — | Virginia |
| 18 | James H. Williamson | 45 | Head | Truckster | Illinois |
| 19 | Ruth E. Williamson | 41 | wife | — | Indiana |
| 20 | James G. Williamson | 24 | son | Truck Driver | Illinois |
| 21 | John T. Williamson | 23 | son | Truckster | Illinois |
| 22 | Betty K. Williamson | 16 | daughter | — | Illinois |
| 23 | Robert L. Williamson THIS PERSON | 14 | son | — | Illinois |
| 24 | Cleada D. Williamson | 12 | daughter | — | Illinois |
| 25 | Rosemary Williamson | 10 | daughter | — | Illinois |
| 26 | Gene A. Williamson | 9 | son | — | Illinois |
| 27 | Dorothy J. Williamson | 5 | daughter | — | Illinois |
| 28 | Lulu Gentry | 50 | Head | — | Kentucky |
| 29 | George F. Switzer | 58 | Head | New Man | Illinois |
| 30 | Audrey L. Switzer | 43 | wife | Housekeeper | Illinois |
| 31 | Ernest E. Ritter | 57 | Head | Farm Hand | Switzerland |
| 32 | Martha E. Ritter | 59 | wife | — | Illinois |
| 33 | Alvin E. Ritter | 23 | son | Farm Hand | Illinois |
| 34 | Eva A. Ritter | 23 | daughter-in-law | Housekeeper | Ohio |
| 35 | Ernest A. Ritter | 5 | grandson | — | Illinois |
| 36 | May A. Greer | 70 | Head | Bookkeeper | Illinois |
| 37 | Grace L. Hamilton | 63 | Head | — | Ohio |
| 38 | Mary L. Greer | 65 | sister | — | Ohio |
| 39 | Chester R. West | 47 | Head | Cafe Owner | Illinois |
| 40 | Leta M. West | 42 | wife | Assistant Cafe Operator | Illinois |
Related Census Records
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)