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Clarence Cook — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Iowa
Our Model Tree links this Clarence Cook across the 1930 and 1940 US Censuses in Jefferson-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 10-person household.
Age 12
b. ~1928
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Iowa |
| Surname | Cook |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Center |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Highest Grade | S 5 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Center |
| Est. Birth Year | ~1928 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Clarence | Age | Birth yr |
|---|---|---|---|---|
| Clarence Cook | Son | — | 12 | ~1928 |
| Alberta Cook | Daughter | — | 10 | ~1930 |
| Billy Cook | Son | — | 8 | ~1932 |
| Shirley Cook | Daughter | — | 17 | ~1923 |
| Innumie Cook | Son | — | 9 | ~1931 |
| Marvin Cook | Son | — | 14 | ~1926 |
| Hazel Cook | Spouse | — | 35 | ~1905 |
| Ilajian Cook | Daughter | — | 1 | ~1939 |
| Arvitta Cook | Daughter | — | 10 | ~1930 |
| Pauline Cook | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Jefferson, Iowa
Son, age 3
Jefferson, Iowa · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Iowa |
| Age at First Marriage | 3 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Jefferson-County, Iowa
Son, age 12
Jefferson-County, Iowa · implied b. ~1928 — 10 household members
| Surname | Cook |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Center |
| 1935 Residence (County) | Jefferson |
| Highest Grade | S 5 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Clarence Cook across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Clarence Cook
Son · 1940 · age 12 · b. ~1928 · Iowa
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Sibling
Innumie Cook
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arvitta Cook
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Shirley Cook
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alberta Cook
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ilajian Cook
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Billy Cook
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marvin Cook
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Pauline Cook
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 — Jefferson-County, Iowa
Open full size
1940 US Federal Census — Jefferson-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01170-00057)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Hazel Cook | 35 | Wife | — | Iowa |
| 42 | Shirley Cook | 17 | Daughter | — | Iowa |
| 43 | Pauline Cook | 15 | Daughter | — | Iowa |
| 44 | Marvin Cook | 14 | Son | — | Iowa |
| 45 | Clarence Cook THIS PERSON | 12 | Son | — | Iowa |
| 46 | Alberta Cook | 10 | Daughter | — | Iowa |
| 47 | Arvitta Cook | 10 | Daughter | — | Iowa |
| 48 | Innumie Cook | 9 | Son | — | Iowa |
| 49 | Billy Cook | 8 | Son | — | Iowa |
| 50 | Ilajian Cook | 1 | Daughter | — | Iowa |
| 51 | Paul Hagens | 25 | Head | Laborer | Iowa |
| 52 | Georgie Hagens | 29 | Wife | — | Iowa |
| 53 | Maxine Hagens | 11 | Daughter | — | Iowa |
| 54 | Violet M. Hagens | 7 | Daughter | — | Iowa |
| 55 | Shirley J. Hagens | 5 | Daughter | — | Iowa |
| 56 | Barba J. Hagens | 3 | Daughter | — | Iowa |
| 57 | Richard L. Hagens | 0 | Son | — | Iowa |
| 58 | Frank A. Nelson | 72 | Head | Well Driller | Iowa |
| 59 | Annie E. Nelson | 66 | Wife | — | Idaho |
| 60 | Rollie Nelson | 46 | Son | Don'T Choose To Work | Iowa |
| 61 | Verle Nelson | 39 | Head | — | Iowa |
| 62 | Evelyn Nelson | 33 | Wife | — | Iowa |
| 63 | Anvil Sylvester | 31 | Head | Corn Laborer | Iowa |
| 64 | Ethel P. Sylvester | 20 | Wife | — | Iowa |
| 65 | Frank R. Stanfield | 52 | Head | Carpenter | Illinois |
| 66 | Tillie Stanfield | 50 | Wife | — | Iowa |
| 67 | Ray Stanfield | 7 | Son | — | Iowa |
| 68 | Cora Sylvester | 57 | Head | — | Iowa |
| 69 | Ida Sylvester | 14 | Daughter | — | Iowa |
| 70 | William Miller | 13 | Head | Laborer | Iowa |
| 71 | Lloyd Jones | 47 | Head | Laborer | Illinois |
| 72 | Jim Wineman | 54 | Boarder | Laborer | Iowa |
| 73 | Joe Siebert | 52 | Head | Clerk | Iowa |
| 74 | Bertha Siebert | 54 | Wife | — | Iowa |
| 75 | Ernest Siebert | 11 | Son | — | Iowa |
| 76 | J. Amos Crafton | 43 | Head | Laborer | Iowa |
| 77 | Sophia Crafton | 28 | Wife | — | Iowa |
| 78 | Eloise M. Crafton | 11 | Daughter | — | Iowa |
| 79 | Emma Crafton | 8 | Daughter | — | Iowa |
| 80 | Charles Crafton | 6 | Son | — | Iowa |
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)