DC
Donald Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Clair-County, Illinois
Our Model Tree links this Donald Clark across the 1930 and 1940 US Censuses in St.-Clair-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 9-person household.
Age 20
b. ~1920
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Clair-County, Illinois |
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | East St. Louis |
| 1935 Residence (County) | St. Clair |
| Additional Details | |
| Occupation | Delivery Boy |
| Industry | Newspaper Route |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 364 |
| Highest Grade | H 2 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Delivery Boy |
| Township / Ward | East St Louis |
| Est. Birth Year | ~1920 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Donald | Age | Birth yr |
|---|---|---|---|---|
| Betty Clark | Daughter | — | 9 | ~1931 |
| Ida Clark | Daughter | — | 6 | ~1934 |
| Hattie Clark | Spouse | — | 49 | ~1891 |
| Chester Clark | Head | — | 58 | ~1882 |
| Mary Clark | Daughter | — | 12 | ~1928 |
| Donald Clark | Son | — | 20 | ~1920 |
| Robert Clark | Son | — | 15 | ~1925 |
| Freda Clark | Daughter | — | 18 | ~1922 |
| Franklin Clark | Son | — | 24 | ~1916 |
Census Appearances
1930
St Clair, …
Son, age 10
St Clair, Illinois · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
St.-Clair-County, Illinois
Son, age 20
St.-Clair-County, Illinois · implied b. ~1920 — 9 household members
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | East St. Louis |
| 1935 Residence (County) | St. Clair |
| Occupation | Delivery Boy |
| Industry | Newspaper Route |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 364 |
| Highest Grade | H 2 |
| 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 Donald Clark across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Donald Clark
Son · 1940 · age 20 · b. ~1920 · Illinois
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Sibling
Franklin Clark
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ida Clark
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Freda Clark
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Clark
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Clark
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Clark
Sibling · 1940 · age 15
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 — St.-Clair-County, Illinois
Open full size
1940 US Federal Census — St.-Clair-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00880-00268)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Timothy Mencias | 15 | Son | — | Illinois |
| 42 | Dominic Mencias | 13 | Son | — | Illinois |
| 43 | John Cygan | 58 | Head | Coal Miner | Poland |
| 44 | Mary Cygan | 49 | Wife | Drapery | Poland |
| 45 | Caroline Cygan | 27 | Daughter | Beauty Operator | Illinois |
| 46 | Frances Cygan | 22 | Daughter | Waitress | Illinois |
| 47 | Emily Cygan | 18 | Daughter | — | Illinois |
| 48 | Edward Cygan | 10 | Son | — | Illinois |
| 49 | John Cygan | 9 | Son | — | Illinois |
| 50 | Sophia Cygan | 12 | Daughter | — | Illinois |
| 51 | Joseph Norris | 54 | Head | Baker | Czechoslovakia |
| 52 | Mary Norris | 50 | Wife | — | Russia |
| 53 | Helen Norris | 18 | Daughter | New Worker | Illinois |
| 54 | Emily Norris | 16 | Daughter | New Worker | Illinois |
| 55 | Joseph Jr. Norris | 13 | Son | — | Illinois |
| 56 | Justina Kruta | 70 | Mother-in-law | — | Czechoslovakia |
| 57 | Steve Morfick | 31 | Head | Laborer | Illinois |
| 58 | Verna Morfick | 24 | Wife | — | Illinois |
| 59 | Diana Morfick | 2 | Daughter | — | Illinois |
| 60 | Ernest Denaster | 27 | Head | Laborer | Missouri |
| 61 | Evelyn Denaster | 26 | Wife | — | Illinois |
| 62 | Grace Denaster | 8 | Daughter | — | Illinois |
| 63 | Ernest Jr. Denaster | 6 | Son | — | Illinois |
| 64 | Lawrence Denaster | 3 | Son | — | Illinois |
| 65 | Leilanie Denaster | 1 | Daughter | — | Illinois |
| 66 | Chester James Clark | 58 | Head | Maintenance Carpenter Agent | Illinois |
| 67 | Hattie Clark | 49 | Wife | — | Illinois |
| 68 | Franklin Clark | 24 | Son | — | Illinois |
| 69 | Donald Clark THIS PERSON | 20 | Son | Delivery Boy | Illinois |
| 70 | Freda Clark | 18 | Daughter | Waitress | Illinois |
| 71 | Robert Clark | 15 | Son | Delivery Boy | Illinois |
| 72 | Mary Clark | 12 | Daughter | — | Illinois |
| 73 | Betty Clark | 9 | Daughter | — | Illinois |
| 74 | Ida May Clark | 6 | Daughter | — | Illinois |
| 75 | Frank Kulick | 37 | Head | Lay Inspector | Illinois |
| 76 | Sophia Kulick | 31 | Wife | — | Illinois |
| 77 | Charles Kulick | 10 | Son | — | Illinois |
| 78 | Walter Musick | 19 | Brother-in-law | Laborer | Illinois |
| 79 | Casimir Zagorski | 34 | Head | Filling Station Attendant | Illinois |
| 80 | Mary Zagorski | 30 | Wife | — | Illinois |
Related Census Records
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)