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Robert Griffith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Contra-Costa-County, California
Our Model Tree links this Robert Griffith across the 1930 and 1940 US Censuses in Contra-Costa-County, California (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 8-person household.
Age 19
b. ~1921
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Contra-Costa-County, California |
| Surname | Griffith |
| Given Name | Robert S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Richmond |
| 1935 Residence (County) | Contra Costa |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Pablo |
| Est. Birth Year | ~1921 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Edna Griffith | Spouse | — | 38 | ~1902 |
| Robert Griffith | Son | — | 19 | ~1921 |
| Maude Griffith | Daughter | — | 15 | ~1925 |
| Lucille Griffith | Daughter | — | 17 | ~1923 |
| Barbara Griffith | Daughter | — | 2 | ~1938 |
| June Griffith | Daughter | — | 12 | ~1928 |
| Clair Griffith | Head | — | 41 | ~1899 |
| Beverly Griffith | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Contra Costa, …
Son, age 9
Contra Costa, California · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffith |
| Given Name | Robert S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Idaho |
| Mother's Birthplace | Nebraska |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Contra-Costa-County, California
Son, age 19
Contra-Costa-County, California · implied b. ~1921 — 8 household members
| Surname | Griffith |
| Given Name | Robert S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Richmond |
| 1935 Residence (County) | Contra Costa |
| Highest Grade | Hs 4 |
| 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 Robert Griffith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Griffith
Son · 1940 · age 19 · b. ~1921 · California
★ You are viewing this record
Sibling
Barbara Griffith
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
June Griffith
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beverly Griffith
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maude Griffith
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Griffith
Sibling · 1940 · age 17
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 — Contra-Costa-County, California
Open full size
1940 US Federal Census — Contra-Costa-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00197-00378)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward J. Rose | 4 | Son | — | California |
| 42 | Charles Pearson | 44 | Head | Proprietor | New York |
| 43 | Marian E. Pearson | 24 | Wife | Stenographer | California |
| 44 | Clifford Freese | 58 | Head | Wharf Man | California |
| 45 | Mida Freese | 56 | Wife | — | Maine |
| 46 | Emma A. Peltingill | 88 | Mother | — | Maine |
| 47 | Karen M. Gillette | 44 | Head | — | Denmark |
| 48 | Karen M. Gillette | 7 | Daughter | — | California |
| 49 | James V. Parish | 20 | Son | Pipe Line Laborer | Colorado |
| 50 | William H. Andrada | 33 | Head | Warehouseman | California |
| 51 | Marie P. Andrada | 28 | Wife | — | California |
| 52 | Floyd Parker | 37 | Head | Fireman | Michigan |
| 53 | Emma I. Parker | 37 | Wife | — | Wisconsin |
| 54 | Mary A. Parker | 13 | Daughter | — | California |
| 55 | Darlene A. Parker | 11 | Daughter | — | California |
| 56 | Barbara L. Parker | 4 | Daughter | — | California |
| 57 | Harry Mcandrews | 40 | Head | Painter | Colorado |
| 58 | Violet E. Mcandrews | 31 | Wife | — | California |
| 59 | John E. Calhoun | 72 | Head | Watchman | Arkansas |
| 60 | Lena Calhoun | 71 | Wife | — | Tennessee |
| 61 | Myrtle L. Stull | 48 | Daughter | Seamstress | New Mexico |
| 62 | Clair S. Griffith | 41 | Head | Locomotive Eng'R | Idaho |
| 63 | Edna L. Griffith | 38 | Wife | — | Nebraska |
| 64 | Robert S. Griffith THIS PERSON | 19 | Son | — | California |
| 65 | Lucille N. Griffith | 17 | Daughter | — | California |
| 66 | Maude E. Griffith | 15 | Daughter | — | California |
| 67 | June E. Griffith | 12 | Daughter | — | California |
| 68 | Beverly Griffith | 10 | Daughter | — | California |
| 69 | Barbara J. Griffith | 2 | Daughter | — | California |
| 70 | Samuel J. Ratto | 22 | Head | Loader | California |
| 71 | Mary F. Ratto | 23 | Wife | Stamper | California |
| 72 | Alessandro Barducci | 57 | Head | Proprietor | Italy |
| 73 | Bianca Barducci | 50 | Wife | — | Italy |
| 74 | Lido N. Barducci | 24 | Son | Laborer | California |
| 75 | Margaret Barducci | 16 | Daughter | — | California |
| 76 | Joseph Guanich | 55 | Head | Peeler | Yugoslavia |
| 77 | Mary Guanich | 41 | Wife | — | Yugoslavia |
| 78 | Ferdinand F. Guanich | 18 | Son | — | California |
| 79 | Agnes S. Guanich | 15 | Daughter | — | California |
| 80 | Zora Guanich | 11 | Daughter | — | 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)