DC
Donald Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kane-County, Illinois
Our Model Tree links this Donald Clark across the 1920, 1930 and 1940 US Censuses in Kane-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1905), then head of a 3-person household.
Age 35
b. ~1905
Male
Head
Born: Colorado
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kane-County, Illinois |
| Surname | Clark |
| Given Name | Donald R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | Aurora City |
| 1935 Residence (County) | Kane |
| Additional Details | |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2300 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Brakeman |
| Township / Ward | Aurora City |
| Est. Birth Year | ~1905 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Donald | Age | Birth yr |
|---|---|---|---|---|
| Thelma Clark | Spouse | — | 36 | ~1904 |
| Donald Clark | Head | — | 35 | ~1905 |
| Donald Clark | Son | — | 15 | ~1925 |
Census Appearances
1920
Kane, Illinois
Other, age 14
Kane, Illinois · implied b. ~1906 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Step-Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Occupation | Laborer |
| Industry | Odd Jobs |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Kane, Illinois
Head, age 25
Kane, Illinois · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Colorado |
| Age at First Marriage | 19 |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | No |
| Veteran | 4500 |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Kane-County, Illinois
Head, age 35
Kane-County, Illinois · implied b. ~1905 — 3 household members
| Surname | Clark |
| Given Name | Donald R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | Aurora City |
| 1935 Residence (County) | Kane |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2300 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Donald Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Donald Clark
Head · 1940 · age 35 · b. ~1905 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Kane-County, Illinois
Open full size
1940 US Federal Census — Kane-County, Illinois
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00819-00371)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nancy Fitzgerald | 8 | Daughter | — | Illinois |
| 2 | Joseph Waters | 35 | Head | Sales Manager | Iowa |
| 3 | Mildred Waters | 35 | Wife | — | Iowa |
| 4 | John Waters | 14 | Son | — | Iowa |
| 5 | James Waters | 12 | Son | — | Iowa |
| 6 | Rose Hendrickson | 47 | Head | — | Illinois |
| 7 | Vera May Hendrickson | 20 | Daughter | — | Illinois |
| 8 | Paul G. Walter | 32 | Head | Clerk | Illinois |
| 9 | Esther H. Walter | 32 | Wife | — | Illinois |
| 10 | Lynn Walter | 2 | Son | — | Illinois |
| 11 | Sylvia Walter | 0 | Daughter | — | Illinois |
| 12 | Sam Flaten | 34 | Head | Welder | Wyoming |
| 13 | Anna Flaten | 26 | Wife | — | Nebraska |
| 14 | Sylvia Flaten | 1 | Daughter | — | Illinois |
| 15 | Carl V. Tandall|Tandell | 43 | Head | Tr. Driller | Illinois |
| 16 | Florence Tandall|Tandell | 27 | Wife | — | Illinois |
| 17 | Albert Tandall|Tandell | 19 | Son | H. Tr. Driller | Illinois |
| 18 | Walter Tandall|Tandell | 17 | Son | — | Illinois |
| 19 | Shirley Tandall|Tandell | 12 | Daughter | — | Illinois |
| 20 | Vincent Mort | 31 | Head | Schauffer | Pennsylvania |
| 21 | Mary Ann Mort | 34 | Wife | — | Illinois |
| 22 | Vincent Jr. Mort | 3 | Son | — | Illinois |
| 23 | Joan Mort | 2 | Daughter | — | Illinois |
| 24 | Donald R. Clark THIS PERSON | 35 | Head | Brakeman | Colorado |
| 25 | Thelma L. Clark | 36 | Wife | — | Illinois |
| 26 | Donald K. Clark | 15 | Son | — | Illinois |
| 27 | Martin Mcelroy | 47 | Head | Butcher | Illinois |
| 28 | Eleanor Mcelroy | 19 | Daughter | Telephone Opr. | Illinois |
| 29 | Russell Callahan | 39 | Head | Baker | Illinois |
| 30 | Bessie Callahan | 39 | Wife | — | Illinois |
| 31 | Billie Callahan | 11 | Son | — | Illinois |
| 32 | Donna Callahan | 5 | Daughter | — | Illinois |
| 33 | Dawn Callahan | 5 | Daughter | — | Illinois |
| 34 | Agnes Rodgers | 60 | Mother-in-law | — | Illinois |
| 37 | Elmer Nelson | 48 | Head | Vice President | Illinois |
| 38 | Myrtle Nelson | 45 | Wife | — | Illinois |
| 39 | Carroll Nelson | 14 | Daughter | — | 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)