ET
Eugene Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Eugene Thomas across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 10-person household.
Age 13
b. ~1927
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1927 |
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 Eugene | Age | Birth yr |
|---|---|---|---|---|
| Eugene Thomas | Son | — | 13 | ~1927 |
| Robert Thomas | Son | — | 17 | ~1923 |
| Frank Thomas | Son | — | 21 | ~1919 |
| Ann Thomas | Spouse | — | 42 | ~1898 |
| James Thomas | Son | — | 12 | ~1928 |
| Dorothy Thomas | Daughter | — | 16 | ~1924 |
| Maryann Thomas | Daughter | — | 5 | ~1935 |
| William Thomas | Head | — | 46 | ~1894 |
| John Thomas | Son | — | 22 | ~1918 |
| Frank Sustarich | Other | — | 54 | ~1886 |
Census Appearances
1930
Cook, Illinois
Son, age 2
Cook, Illinois · implied b. ~1928 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 13
Cook-County, Illinois · implied b. ~1927 — 10 household members
| Surname | Thomas |
| Given Name | Eugene |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Highest Grade | No 8 |
| 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 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 13 · b. ~1927 · Illinois
★ You are viewing this record
Sibling
John Thomas
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Thomas
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Thomas
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Thomas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maryann Thomas
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Thomas
Sibling · 1940 · age 12
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00942-00414)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mike Kuzmar | 47 | Head | Stationary Engineer | New York |
| 2 | Nellie Kuzmar | 46 | Wife | — | Poland |
| 3 | Helen Kuzmar | 19 | Daughter | Packer | Illinois |
| 4 | Henry Kuzmar | 18 | Son | Stone Mason | Illinois |
| 5 | Francis Kuzmar | 16 | Daughter | New Worker | Illinois |
| 6 | Antina Kuzmar | 10 | Daughter | — | Illinois |
| 7 | Mildred Kuzmar | 6 | Daughter | — | Illinois |
| 8 | Bernadine Kuzmar | 5 | Daughter | — | Illinois |
| 9 | Steven Tirza | 36 | Head | Cooker | Penn |
| 10 | Mary Tirza | 33 | Wife | — | Hungary |
| 11 | Elizabeth Tirza | 13 | Daughter | — | Illinois |
| 12 | Eugene Tirza | 10 | Son | — | Illinois |
| 13 | James Tirza | 6 | Son | — | Illinois |
| 14 | Bridget Mcnellis | 63 | Head | — | Eire |
| 15 | Thomas Mcnellis | 22 | Son | Yardman | Illinois |
| 16 | Marcia Malvach | 15 | Granddaughter | — | Illinois |
| 17 | Wanda Barnard | 9 | Granddaughter | — | Illinois |
| 18 | Robert Mihala | 4 | Grandson | — | Illinois |
| 19 | Mike Ruforina | 35 | Head | Crane Conductor | Illinois |
| 20 | Eileen Ruforina | 33 | Wife | Machine Operator | Illinois |
| 21 | William Thomas | 46 | Head | Bricklayer | Illinois |
| 22 | Ann Thomas | 42 | Wife | — | Illinois |
| 23 | John Thomas | 22 | Son | Mason App. | Illinois |
| 24 | Frank Thomas | 21 | Son | Labor | Illinois |
| 25 | Robert Thomas | 17 | Son | — | Illinois |
| 26 | Dorothy Thomas | 16 | Daughter | — | Illinois |
| 27 | Eugene Thomas THIS PERSON | 13 | Son | — | Illinois |
| 28 | James Thomas | 12 | Son | — | Illinois |
| 29 | Maryann Thomas | 5 | Daughter | — | Illinois |
| 30 | Frank Sustarich | 54 | Brother-in-law | Labor | Austria |
| 31 | William Millis | 71 | Head | Painter | Penn |
| 32 | Ellen Millis | 65 | Wife | — | Arkansas |
| 33 | Henry B. Newman | 56 | Head | Labor | Illinois |
| 34 | Florence Newman | 69 | Wife | — | Arkansas |
| 35 | Lillian D. Wafford | 50 | Head | — | South America |
| 36 | George Janis | 53 | Lodger | Labor | Michigan |
| 37 | Thomas Dowler | 43 | Head | Machinist | Illinois |
| 38 | Martha Dowler | 41 | Wife | — | Illinois |
| 39 | Florence Dowler | 9 | Daughter | — | Illinois |
| 40 | James Dowler | 6 | Son | — | Illinois |
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)