RH
Robert Hamilton — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cowlitz-County, Washington
Our Model Tree links this Robert Hamilton across the 1920, 1930 and 1940 US Censuses in Cowlitz-County, Washington (XGBoost, ~Confirmed), with identified parents Frank & Ida — first a son (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Male
Son
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cowlitz-County, Washington |
| Surname | Hamilton |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Precinct 2 - Kelso |
| Additional Details | |
| Occupation | farm hand |
| Industry | farm |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 888 |
| Highest Grade | H-4 |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Farm Hand |
| Township / Ward | Precinct 2 Kelso |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Hamilton | Daughter | — | 17 | ~1923 |
| Frank Hamilton | Head | — | 55 | ~1885 |
| Frankie Hamilton | Son | — | 10 | ~1930 |
| Robert Hamilton | Son | — | 23 | ~1917 |
| Ida Hamilton | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Cowlitz, Washington
Son, age 3
Cowlitz, Washington · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Robert D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Missouri |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Cowlitz, Washington
Son, age 13
Cowlitz, Washington · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Robert D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Cowlitz-County, Washington
Son, age 23
Cowlitz-County, Washington · implied b. ~1917 — 5 household members
| Surname | Hamilton |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Precinct 2 - Kelso |
| Occupation | farm hand |
| Industry | farm |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 888 |
| Highest Grade | H-4 |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Hamilton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Hamilton (~0.92 confidence) and mother Ida Hamilton (~0.92 confidence) and mother Ida Hamilton (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Hamilton
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Ida Hamilton
b. ~1887
Source mother
● Household
· direct · ~0.92
Mother
Ida Hamilton
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Hamilton
Son · 1940 · age 23 · b. ~1917 · Washington
★ You are viewing this record
Sibling
Frankie Hamilton
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Hamilton
Sibling · 1940 · age 17
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 — Cowlitz-County, Washington
Open full size
1940 US Federal Census — Cowlitz-County, Washington
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-04337-00076)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arthur Dalborn | 6 | son | — | Oregon |
| 2 | Betty Dalborn | 4 | daughter | — | Washington |
| 3 | Edward W. Rea | 34 | head | Salesman | Washington |
| 4 | Dorothy Rea | 31 | wife | — | Oregon |
| 5 | Dorothy Rea | 12 | daughter | — | Oregon |
| 6 | Ruby Rea | 10 | daughter | — | Oregon |
| 7 | Frank S. Hamilton | 55 | head | Farmer | Indiana |
| 8 | Ida L. Hamilton | 53 | wife | — | Iowa |
| 9 | Robert Hamilton THIS PERSON | 23 | son | Farm Hand | Washington |
| 10 | Dorothy Hamilton | 17 | daughter | — | Washington |
| 11 | Frankie Hamilton | 10 | son | — | Washington |
| 12 | Frank L. Masters | 75 | head | — | Ohio |
| 13 | Lenora C. Masters | 71 | wife | — | Michigan |
| 14 | George G. Bentz | 73 | head | — | Illinois |
| 15 | Bert E. Nesbitt | 53 | step son | Feller | Indiana |
| 16 | Maud M. Nesbitt | 49 | daughter | — | Washington |
| 17 | Marjorie Nesbitt | 11 | grand daughter | — | Washington |
| 18 | Ola H. Hanson | 63 | head | Farmer | Iowa |
| 19 | Julia M. Hanson | 62 | wife | — | Illinois |
| 20 | James R. Gable | 59 | son | Farm Hand | Illinois |
| 21 | Phillip Jones | 63 | head | Farmer | California |
| 22 | Ragna Jones | 53 | wife | — | Norway |
| 23 | Lloyd C. Jones | 12 | son | — | Washington |
| 24 | Shirley Steve Jones | 35 | head | Laborer | Washington |
| 25 | Blanche Jones | 30 | wife | — | Washington |
| 26 | Deloris Jones | 7 | daughter | — | Washington |
| 27 | Shirley Jones | 5 | daughter | — | Washington |
| 28 | Cecil Buckholz | 31 | head | Catty Grader | Colorado |
| 29 | Pauline Buckholz | 32 | wife | — | Washington |
| 30 | Nancy Lee Buckholz | 4 | daughter | — | Washington |
| 31 | Cornel Buckholz | 1 | son | — | Washington |
| 32 | Fred E. Englert | 60 | head | School Bus Driver | Nebraska |
| 33 | Jennie Englert | 59 | wife | — | Switzerland |
| 34 | Fred Englert | 19 | son | — | Washington |
| 35 | John Zylstra | 46 | head | Night Watchman | Switzerland |
| 36 | Lenora Zylstra | 46 | wife | — | Washington |
| 37 | Mina Zylstra | 19 | daughter | — | Washington |
| 38 | John H. Zylstra | 15 | son | — | Washington |
| 39 | Judy Zylstra | 0 | daughter | — | Washington |
Related Census Records
Pedigree Summary
Robert + 2 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)