RC
Richard Cook — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Richard Cook across the 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 15-person household.
Age 10
b. ~1930
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Cook |
| Given Name | Richard |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Highest Grade | 3 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Leandro City |
| Est. Birth Year | ~1930 |
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.
15 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Richard | Age | Birth yr |
|---|---|---|---|---|
| Blaine Brainerd | Head | — | 45 | ~1895 |
| Amy Cook | Spouse | — | 40 | ~1900 |
| Cornelius Cook | Other | — | — | |
| Helen Brainerd | Other | — | — | |
| Beverly Case | Daughter | — | 6 | ~1934 |
| Donald Brainerd | Other | — | — | |
| Dorothy Case | Spouse | — | 37 | ~1903 |
| Jessie Brainerd | Spouse | — | 46 | ~1894 |
| Robert Brainerd | Other | — | — | |
| Frank Case | Other | — | — | |
| Richard Cook | Son | — | 10 | ~1930 |
| Roy Brainerd | Other | — | — | |
| Barbara Case | Daughter | — | 6 | ~1934 |
| Mary Cook | Daughter | — | 14 | ~1926 |
| Kenneth Cook | Son | — | 13 | ~1927 |
Census Appearances
1930
Alameda, California
Son, age
Alameda, California · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Richard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Son, age 10
Alameda-County, California · implied b. ~1930 — 15 household members
| Surname | Cook |
| Given Name | Richard |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Highest Grade | 3 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Richard Cook across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Richard Cook
Son · 1940 · age 10 · b. ~1930 · California
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Sibling
Kenneth Cook
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Case
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beverly Case
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cook
Sibling · 1940 · age 14
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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00184-00338)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | B. Edloe | 35 | wife | Secretary | California |
| 42 | R. Milton | 30 | brother | Installer | Utah |
| 43 | Sadie Book | None | J. | — | No 4 |
| 44 | Cecil Duvall | None | E. | 40 | H-4 |
| 45 | Dorothy Duvall | 33 | wife | — | Wisconsin |
| 46 | Marilyn Duvall | 9 | daughter | — | California |
| 47 | Richard Duvall | 6 | son | — | California |
| 48 | Charles Brown | None | L. | 0 | No 7 |
| 49 | Mary Miller | None | L. | 0 | No 7 |
| 50 | William Drury | None | E. | 40 | C-4 |
| 51 | Elinor Drury | None | D. | 0 | No 8 |
| 52 | Elizabeth Drury | None | M. | — | 0 |
| 54 | Ralph Martin | None | B. | 45 | H-4 |
| 55 | Winona Martin | None | D. | 0 | H-4 |
| 56 | Paul Martin | None | S. | — | 4 |
| 57 | Raymond Martin | 8 | son | — | California |
| 58 | Ida Diehl | 78 | mother in law | — | California |
| 59 | Blaine Brainerd | 45 | Head | Physician | Oregon |
| 60 | Jessie Brainerd | 46 | wife | — | South Wales |
| 61 | Helen Brainerd | None | Unis | 0 | H-3 |
| 62 | Donald Brainerd | None | V. | 0 | H-2 |
| 63 | Robert Brainerd | None | F. | 0 | 7 |
| 64 | Roy Brainerd | None | M. | — | 0 |
| 65 | Cornelius Cook | None | J. | 40 | No 8 |
| 66 | Amy Cook | 40 | wife | — | California |
| 67 | Mary Cook | 14 | daughter | — | California |
| 68 | Kenneth Cook | 13 | son | — | California |
| 69 | Richard Cook THIS PERSON | 10 | son | — | California |
| 70 | Frank Case | None | H. | 40 | C-3 |
| 71 | Dorothy Case | 37 | wife | — | California |
| 72 | Barbara Case | 6 | daughter | — | California |
| 73 | Beverly Case | 6 | daughter | — | California |
| 75 | John Peters | 53 | Head | Theatre Manager | Albania |
| 76 | Kitty Peters | 34 | wife | — | California |
| 77 | Lucille Peters | 11 | daughter | — | California |
| 78 | Jack Peters | 8 | son | — | California |
| 79 | Bernice Boyd | 18 | Housekeeper | Housekeeper | California |
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)