TC
Thomas Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Macoupin-County, Illinois
Our Model Tree links this Thomas Clark across the 1920, 1930 and 1940 US Censuses in Macoupin-County, Illinois (XGBoost, ~Confirmed), with identified parents Janet & John — first a son (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Male
Son
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Macoupin-County, Illinois |
| Surname | Clark |
| Given Name | Thomas D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Gillespie City |
| 1935 Residence (County) | Macoupin |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Loader |
| Industry | Superior Coal Co |
| Class of Worker | PW |
| Hours Worked | 14 |
| Income (1939) | 924 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Loader |
| Township / Ward | Gillespie City |
| Est. Birth Year | ~1900 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Janet Clark | Head | — | 66 | ~1874 |
| Thomas Clark | Son | — | 40 | ~1900 |
| Thomas Clark | Son | — | 2 | ~1938 |
| Mildred Clark | Spouse | — | 26 | ~1914 |
Census Appearances
1920
Grundy, Illinois
Son, age 20
Grundy, Illinois · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1911 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Pipe washer |
| Industry | Wagon shop |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Macoupin, Illinois
Son, age 30
Macoupin, Illinois · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Loader |
| Industry | Coal mine |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Scotch |
| Veteran | No |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Macoupin-County, Illinois
Son, age 40
Macoupin-County, Illinois · implied b. ~1900 — 4 household members
| Surname | Clark |
| Given Name | Thomas D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Gillespie City |
| 1935 Residence (County) | Macoupin |
| Naturalization Status | Naturalized |
| Occupation | Loader |
| Industry | Superior Coal Co |
| Class of Worker | PW |
| Hours Worked | 14 |
| Income (1939) | 924 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Thomas Clark across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: mother Janet Clark (~0.92 confidence) and father John Clark (~0.92 confidence) and mother Janet Clark (~0.92 confidence) and father John Clark (~0.92 confidence) and mother Mildred Clark (~0.50 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.84
Mother
Janet Clark
b. ~1874
Source mother
● Household
· direct · ~0.92
Father
John Clark
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Janet Clark
b. ~1875
Source mother
● Household
· direct · ~0.92
Father
John Clark
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Mildred Clark
b. ~1914
Source mother
● Household
· direct · ~0.5
This person
Anchor record
Thomas Clark
Son · 1940 · age 40 · b. ~1900 · Illinois
★ You are viewing this record
Sibling
Thomas Clark
Sibling · 1940 · age 2
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 — Macoupin-County, Illinois
Open full size
1940 US Federal Census — Macoupin-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00846-00176)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Jr. Skertich | 33 | Head | Trip Rider | Yugoslavia |
| 2 | Beulah Skertich | 35 | Wife | — | Illinois |
| 3 | Mary Skertich | 6 | Daughter | — | Illinois |
| 4 | Charles E. Polenko | 57 | Head | Loader | Italy |
| 5 | Edward Polenko | 26 | Son | Truck Driver | Michigan |
| 6 | Lawrence Polenko | 24 | Son | Truck Driver | Michigan |
| 7 | Olive Polenko | 21 | Daughter-in-law | — | Illinois |
| 8 | Carl Polenko | 18 | Son | — | Michigan |
| 9 | Thomas H. Miller | 83 | Head | — | Indiana |
| 10 | Christina Miller | 58 | Wife | — | Scotland |
| 11 | Wilbur Parnell | 36 | Head | Laborer | Illinois |
| 12 | Grace Parnell | 32 | Wife | — | Illinois |
| 13 | Isabelle Parnell | 14 | Daughter | — | Illinois |
| 14 | Wilbur Jr. Parnell | 12 | Son | — | Illinois |
| 15 | Robert Parnell | 10 | Son | — | Illinois |
| 16 | Ida O. Wilson | 50 | Head | — | Illinois |
| 17 | Helen Wilson | 26 | Daughter | — | Illinois |
| 18 | Homer Wilson | 25 | Son | Blaster | Illinois |
| 19 | Ralph Wilson | 21 | Son | — | Illinois |
| 20 | Florence Wilson | 17 | Daughter | — | Illinois |
| 21 | Julius Zangretti | 43 | Head | Loader | Illinois |
| 22 | Theresa Zangretti | 37 | Wife | — | Italy |
| 23 | Leonard Zangretti | 17 | Son | — | Illinois |
| 24 | Loretta Zangretti | 6 | Daughter | — | Illinois |
| 25 | Lawrence Zangretti | 4 | Son | — | Illinois |
| 26 | Frank O. Ross | 63 | Head | Loader | Illinois |
| 27 | Elizabeth Ross | 56 | Wife | — | Wisconsin |
| 28 | Robert Francis Ross | 27 | Son | Builder | Truck Driver | Wisconsin |
| 29 | Richard F. Jr. Ross | 19 | Son | Building Truck | Wisconsin |
| 30 | William Ross | 30 | Head | Miner | Wisconsin |
| 31 | Catherine Ross | 30 | Wife | — | Scotland |
| 32 | Harry Ross | 9 | Son | — | Illinois |
| 33 | Nathan R. Ross | 7 | Son | — | Illinois |
| 34 | Clarence Boswell | 54 | Head | Loader | Illinois |
| 35 | Minnie E. Boswell | 47 | Wife | — | Illinois |
| 36 | Lula May Boswell | 26 | Daughter | — | Illinois |
| 37 | Janet Clark | 66 | Head | — | Scotland |
| 38 | Thomas D. Clark THIS PERSON | 40 | Son | Loader | Scotland |
| 39 | Mildred Clark | 26 | Wife | — | Ohio |
| 40 | Thomas Clark | 2 | Son | — | Illinois |
Pedigree Summary
Thomas + 1 sibling
Gen 1 · 5 parents
~0.84
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)