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Leonard Williams — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Luis-Obispo-County, California
Our Model Tree links this Leonard Williams across the 1920, 1930 and 1940 US Censuses in San-Luis-Obispo-County, California (XGBoost, ~Confirmed), with identified parents John & Annie — first a head (b.~1902), then head of a 4-person household.
Age 38
b. ~1902
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Luis-Obispo-County, California |
| Surname | Williams |
| Given Name | Leonard L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Simeon Township |
| 1935 Residence (County) | San Luis Obispo |
| Additional Details | |
| Occupation | Rancher |
| Industry | Ranch |
| Class of Worker | E |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Rancher |
| Township / Ward | San Simeon Township |
| Est. Birth Year | ~1902 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Leonard | Age | Birth yr |
|---|---|---|---|---|
| Ethyl Williams | Spouse | — | 24 | ~1916 |
| Conrad Williams | Son | — | 11 | ~1929 |
| Leonard Williams | Head | — | 38 | ~1902 |
| Phillip Williams | Son | — | 1 | ~1939 |
Census Appearances
1920
San Luis …
Son, age 17
San Luis Obispo, California · implied b. ~1903 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Laborer |
| Industry | Home Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Luis …
Head, age 27
San Luis Obispo, California · implied b. ~1903 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Leonard |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 25 |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Rancher |
| Industry | Dairy |
| Class of Worker | E |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 10 |
| Radio Set | R |
| Veteran | No |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Luis-Obispo-County, California
Head, age 38
San-Luis-Obispo-County, California · implied b. ~1902 — 4 household members
| Surname | Williams |
| Given Name | Leonard L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Simeon Township |
| 1935 Residence (County) | San Luis Obispo |
| Occupation | Rancher |
| Industry | Ranch |
| Class of Worker | E |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| 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 Leonard Williams across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Williams (~0.92 confidence) and mother Annie Williams (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Williams
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Annie Williams
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Leonard Williams
Head · 1940 · age 38 · b. ~1902 · 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-Luis-Obispo-County, California
Open full size
1940 US Federal Census — San-Luis-Obispo-County, California
Page Contents
17 people indexed on this census page (nara:1940:m-t0627-00328-00926)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James N Evans | 10 | Son | — | California |
| 2 | Walter R Evans | 52 | Head | Proprietor | California |
| 3 | Lana B Evans | 43 | Wife | — | California |
| 4 | Richard J Evans | 13 | Son | — | California |
| 5 | Bruce R Evans | 11 | Son | — | California |
| 6 | Wong H Woo | 52 | Head | Gathering Seaweed | China |
| 7 | Marie Woo | 50 | Wife | — | China |
| 8 | Leonard L Williams THIS PERSON | 38 | Head | Rancher | California |
| 9 | Ethyl I Williams | 24 | Wife | — | California |
| 10 | Conrad I Williams | 11 | Son | — | California |
| 11 | Phillip A Williams | 1 | Son | — | California |
| 12 | William J Evans | 58 | Head | Rancher | California |
| 13 | Charles L Jones | 27 | Head | Ranch Hand | California |
| 14 | Arvista A Jones | 20 | Wife | — | Wisconsin |
| 15 | May N Cherry | 69 | Head | 50 | Ohio |
| 16 | Enos J Priac | 42 | Head | Rancher | California |
| 17 | Nila R Priac | 20 | Wife | — | California |
Pedigree Summary
Leonard
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)