RT
Ruby Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Van-Buren-County, Iowa
Our Model Tree links this Ruby Thomas across the 1920, 1930 and 1940 US Censuses in Van-Buren-County, Iowa (XGBoost, ~Confirmed), with identified parents Otis & Anna — first a daughter (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Van-Buren-County, Iowa |
| Surname | Thomas |
| Given Name | Ruby |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Van Buren Twp |
| 1935 Residence (County) | Van Buren |
| Additional Details | |
| Occupation | Helper |
| Industry | Home |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 200 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Helper |
| Township / Ward | Van Buren Twp |
| Est. Birth Year | ~1919 |
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 Ruby | Age | Birth yr |
|---|---|---|---|---|
| Anna Thomas | Spouse | — | 39 | ~1901 |
| Otto Thomas | Head | — | 54 | ~1886 |
| Cecil Thomas | Son | — | 26 | ~1914 |
| Mary Thomas | Daughter | — | 23 | ~1917 |
| Ruby Thomas | Daughter | — | 21 | ~1919 |
Census Appearances
1920
Van Buren, …
Daughter, age
Van Buren, Iowa · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ruby M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Van Buren, …
Daughter, age 11
Van Buren, Iowa · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ruby M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Van-Buren-County, Iowa
Daughter, age 21
Van-Buren-County, Iowa · implied b. ~1919 — 5 household members
| Surname | Thomas |
| Given Name | Ruby |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Van Buren Twp |
| 1935 Residence (County) | Van Buren |
| Occupation | Helper |
| Industry | Home |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 200 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Ruby Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Otis Thomas (~0.92 confidence) and mother Anna Thomas (~0.92 confidence) and mother Anna Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Otis Thomas
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Anna Thomas
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Anna Thomas
b. ~1901
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ruby Thomas
Daughter · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Cecil Thomas
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Thomas
Sibling · 1940 · age 23
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 — Van-Buren-County, Iowa
Open full size
1940 US Federal Census — Van-Buren-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01208-00804)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Chester Brown | 49 | Head | Farmer | Iowa |
| 2 | Maude Brown | 45 | Wife | H K | Iowa |
| 3 | Byron Brown | 20 | Son | Laborer | Iowa |
| 4 | John Brown | 16 | Son | Laborer | Iowa |
| 5 | Betty Brown | 12 | Daughter | — | Iowa |
| 6 | Lawrence Boyer | 54 | Head | Farmer | Iowa |
| 7 | Thelma Boyer | 39 | Wife | H K | Iowa |
| 8 | John Boyer | 21 | Son | Student | Iowa |
| 9 | Wilma Boyer | 16 | Daughter | Student | Iowa |
| 10 | Wayne Boyer | 13 | Son | — | Iowa |
| 11 | Herald Boyer | 11 | Son | — | Iowa |
| 12 | Irene Boyer | 10 | Daughter | — | Iowa |
| 13 | Marilyn Boyer | 6 | Daughter | — | Iowa |
| 14 | Ester Boyer | 5 | Daughter | — | Iowa |
| 15 | Frank Brill | 62 | Head | Farmer | Iowa |
| 16 | Nissie Brill | 61 | Wife | H K | Iowa |
| 17 | Clyde Brill | 28 | Son | Laborer | Iowa |
| 18 | Earl Brill | 26 | Son | Laborer | Iowa |
| 19 | Joseph Brill | 23 | Son | Laborer | Iowa |
| 20 | John Brill | 61 | Brother | Farmer | Iowa |
| 21 | Homer Cole | 49 | Head | Farmer | Iowa |
| 22 | Hazel Cole | 25 | Wife | H K | Iowa |
| 23 | Paul Cole | 18 | Son | Laborer | Iowa |
| 24 | Earnest Cole | 17 | Son | Laborer | Iowa |
| 25 | Albert Cole | 13 | Son | Laborer | Iowa |
| 26 | Kathern Cole | 9 | Daughter | — | Iowa |
| 27 | Bernard Cole | 7 | Son | — | Iowa |
| 28 | Doris Cole | 5 | Daughter | — | Iowa |
| 29 | Dorothy Cole | 3 | Daughter | — | Iowa |
| 30 | Arthur Poling | 38 | Head | Farmer | Iowa |
| 31 | Etta Poling | 32 | Wife | H K | Iowa |
| 32 | Mary Poling | 9 | Daughter | — | Iowa |
| 33 | John Douglas | 72 | Head | Retired | Missouri |
| 34 | Thad Sheldahl | 55 | Head | Farmer | Iowa |
| 35 | Helen Sheldahl | 53 | Wife | H K | Iowa |
| 36 | Otto Thomas | 54 | Head | Farmer | Iowa |
| 37 | Anna May Thomas | 39 | Wife | H K | Iowa |
| 38 | Cecil Thomas | 26 | Son | Laborer | Iowa |
| 39 | Mary Thomas | 23 | Daughter | Stenographer | Iowa |
| 40 | Ruby Thomas THIS PERSON | 21 | Daughter | Helper | Iowa |
Related Census Records
Pedigree Summary
Ruby + 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)