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James Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Imperial-County, California
Our Model Tree links this James Brock across the 1920, 1930 and 1940 US Censuses in Imperial-County, California (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Imperial-County, California |
| Surname | Brock |
| Given Name | James E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | El Centro |
| 1935 Residence (County) | Imperial |
| Additional Details | |
| Occupation | Rancher |
| Industry | Own Ranch |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 5000 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Rancher |
| Township / Ward | El Centro |
| Est. Birth Year | ~1884 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Donald Brock | Son | — | 20 | ~1920 |
| James Brock | Head | — | 56 | ~1884 |
| Mary Brock | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Imperial, California
Head, age 35
Imperial, California · implied b. ~1885 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brook |
| Given Name | James E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farming |
| Industry | General Farm |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Imperial, California
Head, age 45
Imperial, California · implied b. ~1885 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | James E |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 26 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | Farm Gen |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Imperial-County, California
Head, age 56
Imperial-County, California · implied b. ~1884 — 3 household members
| Surname | Brock |
| Given Name | James E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | El Centro |
| 1935 Residence (County) | Imperial |
| Occupation | Rancher |
| Industry | Own Ranch |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 5000 |
| Highest Grade | C 4 |
| 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 James Brock across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Brock
Head · 1940 · age 56 · b. ~1884 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Imperial-County, California
Open full size
1940 US Federal Census — Imperial-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00209-00473)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Steven H. Harris | 32 | Head | Superintendent | Texas |
| 2 | Ernestine E. Harris | 30 | Wife | — | California |
| 3 | Suzanne M. Harris | 3 | Daughter | — | California |
| 4 | Mildred Osuna | 18 | Maid | Maid | California |
| 5 | James E. Brock THIS PERSON | 56 | Head | Rancher | Illinois |
| 6 | Mary L. Brock | 53 | Wife | — | Kansas |
| 7 | Donald Brock | 20 | Son | Clerk | California |
| 8 | Carl Ashley | 40 | Head | Salesman | Texas |
| 9 | Charlotte Ashley | 32 | Wife | — | Texas |
| 10 | Doris Ashley | 13 | Daughter | — | California |
| 11 | Joan Ashley | 6 | Daughter | — | California |
| 12 | Robert Dinsmore | 32 | Head | Engineer | Ohio |
| 13 | Lois Dinsmore | 31 | Wife | — | California |
| 14 | Dorothy Dinsmore | 8 | Daughter | — | California |
| 15 | Louis Mcmanus | 34 | Head | Manager | Colorado |
| 16 | Dorothy Mcmanus | 29 | Wife | — | Texas |
| 17 | Ronald Mcmanus | 4 | Son | — | California |
| 18 | Richard Mcmanus | 1 | Son | — | California |
| 19 | Roger Mcmanus | 2 | Son | — | California |
| 20 | Raymond Clemans | 38 | Head | Dentist | California |
| 21 | Elsie Clemans | 39 | Wife | — | Wisconsin |
| 22 | Raymond Jr. Clemans | 14 | Son | — | California |
| 23 | Alice Clemans | 11 | Daughter | — | California |
| 24 | Philip Hodgkin | 45 | Head | Physician + Surgeon | California |
| 25 | Faith Hodgkin | 40 | Wife | — | Michigan |
| 26 | Lewis M. House | 56 | Head | Physician + Surgeon | Indiana |
| 27 | Lou E. House | 49 | Wife | — | Colorado |
| 28 | Dorothy Lou Gilliam | 21 | Niece | Secretary | Colorado |
| 29 | Guy A. Weakley | 47 | Head | Superintendent | Missouri |
| 30 | Lillian Weakley | 45 | Wife | — | Kansas |
| 31 | Robert L. Weakley | 17 | Son | — | Kansas |
| 32 | Frank Weakley | 14 | Son | — | California |
| 33 | Ester Weakley | 12 | Daughter | — | California |
| 34 | David Weakley | 10 | Son | — | California |
| 35 | Charles E. Sprouse | 58 | Head | Real Estate Broker | Missouri |
| 36 | Georgia M. Sprouse | 58 | Wife | — | Illinois |
| 37 | Norman Deaton | 43 | Head | Proprietor | Illinois |
| 38 | Lucy O. Deaton | 39 | Wife | — | Wisconsin |
| 39 | John Deaton | 2 | Son | — | California |
| 40 | Lucy Johnson | 63 | Mother-in-law | — | 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)