JT
Jack Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Carbon-County, Utah
Our Model Tree links this Jack Thomas across the 1930 and 1940 US Censuses in Carbon-County, Utah (XGBoost, ~Confirmed) — first a son (b.~1914), then head of a 6-person household.
Age 26
b. ~1914
Male
Son
Born: Utah
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Carbon-County, Utah |
| Surname | Thomas |
| Given Name | Jack L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Utah |
| 1935 Residence (City) | Scofield City |
| 1935 Residence (County) | Carbon |
| Additional Details | |
| Occupation | Farmer |
| Industry | Father's farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
| Occupation | Farmer |
| Township / Ward | Scofield City |
| Est. Birth Year | ~1914 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Jack Thomas | Son | — | 26 | ~1914 |
| Mary Thomas | Spouse | — | 48 | ~1892 |
| Betty Thomas | Daughter | — | 16 | ~1924 |
| Josephine Thomas | Daughter | — | 9 | ~1931 |
| Lee Thomas | Head | — | 51 | ~1889 |
| Earl Thomas | Son | — | 23 | ~1917 |
Census Appearances
1930
Carbon, Utah
Son, age 16
Carbon, Utah · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Utah |
| Father's Birthplace | Utah |
| Mother's Birthplace | Utah |
| Can Read/Write | Yes |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
1940
Carbon-County, Utah
Son, age 26
Carbon-County, Utah · implied b. ~1914 — 6 household members
| Surname | Thomas |
| Given Name | Jack L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Utah |
| 1935 Residence (City) | Scofield City |
| 1935 Residence (County) | Carbon |
| Occupation | Farmer |
| Industry | Father's farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | Utah |
| Birth Country | United States |
| Birthplace (normalized) | utah |
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 Jack Thomas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Thomas
Son · 1940 · age 26 · b. ~1914 · Utah
★ You are viewing this record
Sibling
Josephine Thomas
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Thomas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Earl 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 — Carbon-County, Utah
Open full size
1940 US Federal Census — Carbon-County, Utah
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04211-00006)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lee S Thomas | 51 | Head | Farmer | Utah |
| 2 | Mary A Thomas | 48 | Wife | — | Utah |
| 3 | Jack L Thomas THIS PERSON | 26 | Son | Farmer | Utah |
| 4 | Earl J Thomas | 23 | Son | Farmer | Utah |
| 5 | Betty Lou Thomas | 16 | Daughter | — | Utah |
| 6 | Josephine Thomas | 9 | Daughter | — | Utah |
| 7 | Katherine E Madsen | 57 | Head | Farmer | Utah |
| 8 | Josipa Podbevsek | 57 | Head | — | Yugoslavia |
| 9 | Veronica Podbevsek | 47 | Wife | — | Pennsylvania |
| 10 | Joseph Podbevsek | 28 | Son | Miner | Utah |
| 11 | Mary Podbevsek | 23 | Daughter | House Work | Utah |
| 12 | Frances Podbevsek | 21 | Daughter | House Work | Utah |
| 13 | Frank Podbevsek | 18 | Son | New Worker | Utah |
| 14 | Veronica Podbevsek | 16 | Daughter | — | Utah |
| 15 | Stanley Podbevsek | 11 | Son | — | Utah |
| 16 | Ghae Podbevsek | 8 | Daughter | — | Utah |
| 17 | Foster D Leek | 51 | Head | Miner | Utah |
| 18 | Alta T Leek | 34 | Wife | — | Utah |
| 19 | Jerry D Leek | 15 | Son | — | Utah |
| 20 | Leonard F Leek | 13 | Son | — | Utah |
| 21 | Kenneth F Leek | 11 | Son | — | Utah |
| 22 | Shannon J Leek | 7 | Daughter | — | Utah |
| 23 | William G Leek | 5 | Son | — | Utah |
| 24 | Floyd E Leek | 3 | Son | — | Utah |
| 25 | Samuel Leek | 2 | Son | — | Utah |
| 26 | Richard D Williams | 31 | Head | Miner | Utah |
| 27 | Ethel V Williams | 23 | Wife | — | Utah |
| 28 | Belva Rae Williams | 4 | Daughter | — | Utah |
| 29 | Ethel Jean Williams | 2 | Daughter | — | Utah |
| 30 | John Hardman | 32 | Head | Miner | Utah |
| 31 | Donna D Hardman | 22 | Wife | — | Utah |
| 32 | Marly Joy Hardman | 4 | Daughter | — | Utah |
| 33 | Victor W Hardman | 2 | Son | — | Utah |
| 34 | Doreen F Hardman | 1 | Daughter | — | Utah |
| 35 | James A Donahue | 44 | Head | Section Hand | England |
| 36 | Dennis D Murphy | 58 | Head | Miner | England |
| 37 | David Murphy | 25 | Son | Team Motor | Montana |
| 38 | Robert D Mamic | 61 | Head | Miner | Finland |
| 39 | Benjamin D Helsten | 31 | Head | Miner | Utah |
| 40 | Nida C Helsten | 24 | Wife | — | Utah |
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)