RT
Ralph Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Knox-County, Illinois
Our Model Tree links this Ralph Thomas across the 1920, 1930 and 1940 US Censuses in Knox-County, Illinois (XGBoost, ~Confirmed), with identified parents A & A — first a head (b.~1907), then head of a 7-person household.
Age 33
b. ~1907
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Illinois |
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Occupation | shovelwork |
| Industry | digging ditch |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Ill |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Shovelwork |
| Township / Ward | Maquon Village |
| Est. Birth Year | ~1907 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ralph | Age | Birth yr |
|---|---|---|---|---|
| Ralph Thomas | Head | — | 33 | ~1907 |
| Bernice Thomas | Spouse | — | 30 | ~1910 |
| Larry Thomas | Son | — | 5 | ~1935 |
| Mary Thomas | Daughter | — | 1 | ~1939 |
| Joann Thomas | Daughter | — | 2 | ~1938 |
| Virginia Thomas | Daughter | — | 4 | ~1936 |
| Marjorie Thomas | Daughter | — | — |
Census Appearances
1920
Knox, Illinois
Son, age 13
Knox, Illinois · implied b. ~1907 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Knox, Illinois
Son, age 22
Knox, Illinois · implied b. ~1908 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Labour |
| Industry | Day Work |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Knox-County, Illinois
Head, age 33
Knox-County, Illinois · implied b. ~1907 — 7 household members
| Surname | Thomas |
| Given Name | Ralph |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Occupation | shovelwork |
| Industry | digging ditch |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Ill |
| 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 Ralph Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father A Thomas (~0.92 confidence) and father A Thomas (~0.92 confidence) and mother Olive Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
A Thomas
b. ~1861
Source father
● Household
· direct · ~0.92
Father
A Thomas
b. ~1861
Source father
● Household
· direct · ~0.92
Mother
Olive Thomas
b. ~1870
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Thomas
Head · 1940 · age 33 · b. ~1907 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Knox-County, Illinois
Open full size
1940 US Federal Census — Knox-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00827-00188)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hattie Walker | 75 | Head | — | Illinois |
| 2 | Edith Haynes | 33 | daughter | Waiter | Illinois |
| 3 | Robert Haynes | 33 | son-in-law | Laborer | Illinois |
| 4 | Danny Haynes | 4 | grandson | — | Illinois |
| 5 | Paul Kelsy | 38 | Head | Truck Driver | Illinois |
| 6 | Eva Kelsy | 30 | wife | — | Illinois |
| 7 | H Kelsy | 9 | son | — | Illinois |
| 8 | Paula Kelsy | 2 | daughter | — | Illinois |
| 9 | Ralph Thomas THIS PERSON | 33 | Head | Shovelwork | Illinois |
| 10 | Bernice Thomas | 30 | wife | — | Illinois |
| 11 | Larry Thomas | 5 | son | — | Illinois |
| 12 | Virginia Thomas | 4 | daughter | — | Illinois |
| 13 | Joann Thomas | 2 | daughter | — | Illinois |
| 14 | Mary J. Thomas | 1 | daughter | — | Illinois |
| 15 | Marjorie Thomas | None | daughter | — | Illinois |
| 16 | Russell E. Martin | 30 | Head | Mechanic | Illinois |
| 17 | Dorothy Martin | 21 | wife | — | Illinois |
| 18 | Jerry D. Martin | 1 | son | — | Illinois |
| 19 | Effie Stierwalt | 57 | Head | Proprietor | Illinois |
| 20 | Martha A. Stierwalt | 14 | daughter | — | Illinois |
| 21 | Monte J. Stierwalt | 17 | son | — | Illinois |
| 22 | Mary Mires | 74 | Head | — | Illinois |
| 23 | Maude W. Alter | 75 | lodger | — | Illinois |
| 24 | Milo Elkins | 66 | Head | — | Iowa |
| 25 | Josephine Elkins | 56 | wife | Cook | Wisconsin |
| 26 | William Simpkins | 80 | Head | — | Illinois |
| 27 | Alice Simpkins | 74 | wife | — | Illinois |
| 28 | Arthur Widner | 29 | Head | Mechanic | Illinois |
| 29 | Viola Widner | 25 | wife | — | Illinois |
| 30 | Joy Widner | 6 | daughter | — | Illinois |
| 31 | Mary Longwell | 71 | Head | — | Illinois |
| 32 | Howard Bright | 70 | Head | — | Indiana |
| 33 | Clara Bright | 54 | wife | — | Illinois |
| 34 | Ollie Bright | 37 | son | Mechanic | Illinois |
| 35 | Bernard Bright | 30 | son | Laborer | Illinois |
| 36 | John Harler | 31 | Head | Attendant | Illinois |
| 37 | June Harler | 31 | wife | — | Illinois |
| 38 | Jack Harler | 4 | son | — | Illinois |
| 39 | Rebecca Mcwilliams | 66 | mother-in-law | — | Illinois |
| 40 | William Lucas | 61 | Head | — | Illinois |
Pedigree Summary
Ralph
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)