DC
David Cook — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marion-County, Illinois
Our Model Tree links this David Cook across the 1930 and 1940 US Censuses in Marion-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Illinois |
| Surname | Cook |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Sandoval Village |
| Est. Birth Year | ~1925 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to David | Age | Birth yr |
|---|---|---|---|---|
| David Cook | Son | — | 15 | ~1925 |
| Nola Cook | Spouse | — | 36 | ~1904 |
| Barbara Cook | Daughter | — | 1 | ~1939 |
| Darrel Cook | Son | — | 12 | ~1928 |
| John Cook | Head | — | 37 | ~1903 |
| Bobby Cook | Son | — | 8 | ~1932 |
| Johnie Cook | Son | — | 7 | ~1933 |
| Harold Cook | Son | — | 13 | ~1927 |
Census Appearances
1930
Bond, Illinois
Son, age 4
Bond, Illinois · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Marion-County, Illinois
Son, age 15
Marion-County, Illinois · implied b. ~1925 — 8 household members
| Surname | Cook |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| Highest Grade | 5 |
| 1935 Residence | Illinois |
| 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 David Cook across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
David Cook
Son · 1940 · age 15 · b. ~1925 · Illinois
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Sibling
Barbara Cook
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Johnie Cook
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Darrel Cook
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Cook
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bobby Cook
Sibling · 1940 · age 8
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 — Marion-County, Illinois
Open full size
1940 US Federal Census — Marion-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00853-00554)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Asa Jackson | 31 | Head | Furnace Worker | Illinois |
| 42 | Thelma Jackson | 23 | Wife | — | Arkansas |
| 43 | Leidajane Jackson | 2 | Daughter | — | Illinois |
| 44 | Francis Boyle | 38 | Head | Head Gauger | Ohio |
| 45 | Catherine Boyle | 35 | Wife | — | Ohio |
| 46 | Mary Barbara Boyle | 12 | Daughter | — | Texas |
| 47 | Catherine Theresa Boyle | 9 | Daughter | — | Texas |
| 48 | James Boyle | 5 | Son | — | Texas |
| 49 | Thomas Boyle | 3 | Son | — | Texas |
| 50 | Furness Robertson | 38 | Brother-in-law | Clerical Assistant | Illinois |
| 51 | Thomas Robertson | 62 | Brother-in-law | — | Illinois |
| 52 | George Evans | 33 | Head | Asst Supt Of Oil Field | Pennsylvania |
| 53 | John Barber | 24 | Lodger | Book Keeper | Illinois |
| 54 | John Cook | 37 | Head | Laborer | Illinois |
| 55 | Nola Cook | 36 | Wife | — | Illinois |
| 56 | David Cook THIS PERSON | 15 | Son | — | Illinois |
| 57 | Harold Cook | 13 | Son | — | Illinois |
| 58 | Darrel Cook | 12 | Son | — | Illinois |
| 59 | Bobby Cook | 8 | Son | — | Illinois |
| 60 | Johnie Cook | 7 | Son | — | Illinois |
| 61 | Barbara Cook | 1 | Daughter | — | Illinois |
| 62 | Perry Clark | 32 | Head | Laborer | Indiana |
| 63 | Prudence Clark | 32 | Wife | — | Illinois |
| 64 | Charles Boothman | 31 | Head | Brick Layer | Illinois |
| 65 | Mildred Boothman | 28 | Wife | — | Missouri |
| 66 | Charles Boothman | 7 | Son | — | Missouri |
| 67 | Richard Boothman | 5 | Son | — | Missouri |
| 68 | Donald Boothman | 3 | Son | — | Missouri |
| 69 | Rose Mary Boothman | 1 | Daughter | — | Illinois |
| 70 | Clifford Merten | 49 | Head | Owner | Illinois |
| 71 | Myrtle E. Merten | 31 | Wife | — | Illinois |
| 72 | Marilyn Merten | 6 | Daughter | — | Illinois |
| 73 | Phyllis Merten | 5 | Daughter | — | Illinois |
| 74 | T. C. Jr Merten | 2 | Son | — | Illinois |
| 75 | Roy Brown | 49 | Head | Pumper | Illinois |
| 76 | Ruby Brown | 42 | Wife | — | Illinois |
| 77 | Donna Brown | 33 | Daughter | — | Illinois |
| 78 | Albin Raindron | 75 | Head | Old Age Asst | Illinois |
| 79 | Rosco Raindron | 45 | Son | Laborer | Illinois |
| 80 | Susan Cruse | 58 | Head | — | 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)