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Eugene Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Bernardino-County, California
Our Model Tree links this Eugene Thomas across the 1930 and 1940 US Censuses in San-Bernardino-County, California (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Bernardino-County, California |
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Cucamonga Township |
| 1935 Residence (County) | San Bernardino |
| Additional Details | |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Cucamonga Township |
| Est. Birth Year | ~1929 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Eugene | Age | Birth yr |
|---|---|---|---|---|
| John Thomas | Son | — | 15 | ~1925 |
| Leota Thomas | Daughter | — | 9 | ~1931 |
| Melvin Thomas | Son | — | 6 | ~1934 |
| Leona Thomas | Daughter | — | 9 | ~1931 |
| Eugene Thomas | Son | — | 11 | ~1929 |
| Fred Thomas | Son | — | 17 | ~1923 |
| Ella Thomas | Spouse | — | 46 | ~1894 |
| Arnell Thomas | Son | — | 14 | ~1926 |
| Lester Thomas | Head | — | 46 | ~1894 |
Census Appearances
1930
San Bernardino, …
Son, age 1
San Bernardino, California · implied b. ~1929 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Georgia |
| Mother's Birthplace | North Carolina |
| Occupation | none |
| Can Read/Write | No |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Bernardino-County, California
Son, age 11
San-Bernardino-County, California · implied b. ~1929 — 9 household members
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Cucamonga Township |
| 1935 Residence (County) | San Bernardino |
| Class of Worker | NP |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Eugene Thomas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Eugene Thomas
Son · 1940 · age 11 · b. ~1929 · California
★ You are viewing this record
Sibling
Arnell Thomas
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Thomas
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leona Thomas
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leota Thomas
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Melvin Thomas
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fred Thomas
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 — San-Bernardino-County, California
Open full size
1940 US Federal Census — San-Bernardino-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00289-00151)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy Hoover | 11 | Daughter | — | California |
| 2 | Delores Hoover | 9 | Daughter | — | California |
| 3 | Floyd Hoover | 7 | Son | — | California |
| 4 | Charles Hoover | 5 | Daughter | — | California |
| 5 | Clarence Hoover | 5 | Son | — | California |
| 6 | Ethel Varner | 33 | Head | — | Nebraska |
| 7 | Forrest Varner | 21 | Son | — | Colorado |
| 8 | Joel Varner | 18 | Son | — | Colorado |
| 9 | Robert Brooks | 65 | Head | — | Texas |
| 10 | Fred Weaver | 59 | Head | — | Missouri |
| 11 | Alma Weaver | 64 | Wife | — | Indiana |
| 12 | Clarence Mohler | 38 | Step son | — | — |
| 13 | William B Craig | 36 | Head | Carpenter | Arkansas |
| 14 | Verda Craig | 19 | Wife | — | Oklahoma |
| 15 | William B Craig | 2 | Son | — | California |
| 16 | Robert B Craig | 0 | Son | — | California |
| 17 | Lester Thomas | 46 | Head | — | Georgia |
| 18 | Ella Thomas | 46 | Wife | — | No Carolina |
| 19 | Fred Thomas | 17 | Son | — | Tennessee |
| 20 | John L Thomas | 15 | Son | — | Tennessee |
| 21 | Arnell Thomas | 14 | Son | — | Tennessee |
| 22 | Eugene Thomas THIS PERSON | 11 | Son | — | California |
| 23 | Leota Thomas | 9 | Daughter | — | California |
| 24 | Leona Thomas | 9 | Daughter | — | California |
| 25 | Melvin Thomas | 6 | Son | — | California |
| 26 | Walter Phillips | 30 | Head | Sportman | Oklahoma |
| 27 | Jennie Phillips | 61 | Mother | — | Arkansas |
| 28 | George Gilmore | 30 | Head | — | Kansas |
| 29 | Ella Mae Gilmore | 27 | Wife | — | Tennessee |
| 30 | Vivian Jean Gilmore | 5 | Daughter | — | California |
| 31 | Betty Jean Gilmore | 2 | Daughter | — | California |
| 32 | Clementine Gilmore | None | Daughter | — | California |
| 33 | Albert Carmean | 39 | Head | Labor | Missouri |
| 34 | Mamie Carmean | 31 | Wife | — | Oklahoma |
| 35 | Ruth Carmean | 15 | Daughter | — | Michigan |
| 36 | Leta Carmean | 14 | Daughter | — | Oklahoma |
| 37 | John E Carmean | 12 | Son | — | Oklahoma |
| 38 | Joe Carmean | 10 | Son | — | Oklahoma |
| 39 | Wanda La Carmean | 3 | Daughter | — | California |
| 40 | Sherman Craft | 75 | Father in law | — | Pennsylvania |
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)