IW
Isaac Williams — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this Isaac Williams across the 1910, 1920, 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 3-person household.
Age 75
b. ~1865
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Williams |
| Given Name | Isaac B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Ramona Judicial Township |
| 1935 Residence (County) | San Diego |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Ramona Judicial Township |
| Est. Birth Year | ~1865 |
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 Isaac | Age | Birth yr |
|---|---|---|---|---|
| Isaac Williams | Head | — | 75 | ~1865 |
| Isaac Williams | Son | — | 37 | ~1903 |
| Kate Williams | Spouse | — | 73 | ~1867 |
Census Appearances
1910
San Diego, …
Head, age 46
San Diego, California · implied b. ~1864 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Isaac B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | California |
| Years Married | 23 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Kentucky |
| Occupation | Farmer |
| Industry | Fruit grower |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Diego, …
Head, age 55
San Diego, California · implied b. ~1865 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Isaac B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | California |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Diego, …
Head, age 65
San Diego, California · implied b. ~1865 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Isaac D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 22 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Missouri |
| Occupation | Farmer |
| Industry | Fruit & poultry farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Diego-County, California
Head, age 75
San-Diego-County, California · implied b. ~1865 — 3 household members
| Surname | Williams |
| Given Name | Isaac B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Ramona Judicial Township |
| 1935 Residence (County) | San Diego |
| Industry | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Isaac Williams across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Isaac Williams
Head · 1940 · age 75 · b. ~1865 · California
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — San-Diego-County, California
Open full size
1940 US Federal Census — San-Diego-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00298-00393)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elma G. Tait | 28 | Lodger | Teacher | Canada |
| 42 | Franklin L. Barnes | 41 | Head | District Supervisor | California |
| 43 | Alice G. Barnes | 34 | Wife | — | California |
| 44 | Franklin L. Jr. Barnes | 5 | Son | — | California |
| 45 | Mary A. Barnes | 1 | Daughter | — | California |
| 46 | Edward Y. Young | 67 | Father-in-law | Foreman | Nebraska |
| 47 | Rex A. Detrich | 49 | Head | Rancher | Calif. |
| 48 | Margaret S. Detrich | 49 | Wife | — | Kansas |
| 49 | Mary J. Shaw | 79 | Mother-in-law | — | Pennsylvania |
| 50 | John D. Funk | 20 | Boarder | Ranch Hand | Maryland |
| 51 | Alberto C. Regnery | 53 | Head | — | Missouri |
| 52 | Margaret E. Regnery | 27 | Daughter | School Teacher | Illinois |
| 53 | Rolland J. Regnery | 25 | Son | — | Illinois |
| 54 | Ruth H. Regnery | 23 | Daughter | — | Illinois |
| 55 | David C. Regnery | 21 | Son | — | Illinois |
| 56 | Harry D. Walton | 79 | Head | — | California |
| 57 | William T. Balls | 25 | Head | Laborer | Texas |
| 58 | Vera J. Balls | 25 | Wife | — | Kansas |
| 59 | Arthur E. Franklin | 66 | Head | — | Massachusetts |
| 60 | George S. Drury | 60 | Head | Civil Engineer | Colorado |
| 61 | Junie E. Drury | 53 | Wife | — | Ohio |
| 62 | William J. Drury | 63 | Head | Rancher | Colorado |
| 63 | Josie H. Drury | 39 | Wife | — | Kansas |
| 64 | Mary L. Drury | 16 | Daughter | — | Idaho |
| 65 | George E. Driver | 59 | Head | Children'S Nurse Caretaker | Illinois |
| 66 | Agnes J. Driver | 53 | Wife | — | Missouri |
| 67 | George S. Sorenson | 49 | Head | Superintendent | Idaho |
| 68 | Arthur Sorenson | 52 | Brother | — | Idaho |
| 69 | August F. Kruger | 54 | Head | Owner-Operator | Kansas |
| 70 | Angeline Kruger | 52 | Wife | Co-Owner | Italy |
| 71 | Alice M. Parlow | 70 | Head | — | Maine |
| 72 | Ruth W. Swanstrom | 32 | Companion | Companion | Minnesota |
| 73 | James F. Jamieson | 25 | Head | Ranch Hand | New Jersey |
| 74 | Isaac B. Williams THIS PERSON | 75 | Head | — | California |
| 75 | Kate S. Williams | 73 | Wife | — | California |
| 76 | Isaac B. Williams | 37 | Son | Rancher | California |
| 77 | John S. Ritchie | 41 | Head | Manager | Calif. |
| 78 | Mabell Ritchie | 45 | Wife | — | Idaho |
| 79 | Betty G. Ritchie | 1 | Daughter | — | Calif. |
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)