MW
Mary Williams — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Williams across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1878), then head of a 5-person household.
Age 62
b. ~1878
Female
Spouse
Born: Wales
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Williams |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Wales |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | California |
| Birth Country | Wales |
| Birthplace (normalized) | wales |
| Township / Ward | South Pasadena City |
| Est. Birth Year | ~1878 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Katherine Williams | Daughter | — | 29 | ~1911 |
| Robert Williams | Head | — | 60 | ~1880 |
| Lloyd Williams | Son | — | 32 | ~1908 |
| William Williams | Son | — | 27 | ~1913 |
| Mary Williams | Spouse | — | 62 | ~1878 |
Census Appearances
1920
Los Angeles, …
Spouse, age 43
Los Angeles, California · implied b. ~1877 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Wales |
| Year of Immigration | 1882 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Wales |
| Mother's Birthplace | Wales |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Welsh |
| Birth Country | Wales |
| Year of Naturalization | 1888 |
| Birthplace (normalized) | wales |
1930
Los Angeles, …
Spouse, age 52
Los Angeles, California · implied b. ~1878 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Wales |
| Naturalization Status | Alien |
| Year of Immigration | 1922 |
| Age at First Marriage | 22 |
| Father's Birthplace | Wales |
| Mother's Birthplace | Wales |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Wales |
| Birthplace (normalized) | wales |
1940
Los-Angeles-County, California
Spouse, age 62
Los-Angeles-County, California · implied b. ~1878 — 5 household members
| Surname | Williams |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Wales |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Naturalization Status | Naturalized |
| Highest Grade | No 6 |
| 1935 Residence | California |
| Birth Country | Wales |
| Birthplace (normalized) | wales |
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 Mary Williams across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Williams
Spouse · 1940 · age 62 · b. ~1878 · 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 — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00243-00172)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John D. Jones | 49 | Head | Farm Laborer | Wales |
| 2 | Nellie R. Jones | 54 | Wife | — | Wales |
| 3 | John M. Schmoele | 48 | Head | Physician & Surgeon | Virginia |
| 4 | Nancy B. Schmoele | 35 | Wife | — | California |
| 5 | Joan B. Schmoele | 14 | Daughter | — | California |
| 6 | Nancy Schmoele | 10 | Daughter | — | California |
| 7 | Ferdinand S. Whittaker | 35 | Chauffeur | Private Chauffeur | Oklahoma |
| 8 | Agusta J. Whittaker | 39 | Cook | Family Cook | Oklahoma |
| 9 | Julia Hovey | 80 | Head | — | Maine |
| 10 | Robert Williams | 60 | Head | Farm Laborer | Wales |
| 11 | Mary Williams THIS PERSON | 62 | Wife | — | Wales |
| 12 | Lloyd Williams | 32 | Son | Attendant | Wales |
| 13 | Katherine Williams | 29 | Daughter | Meat Packer | Wales |
| 14 | William P. Williams | 27 | Son | Apprentice Plasterer | Wales |
| 15 | S. Carrol Owen | 54 | Head | Crime Prevention Supervisor | Wisconsin |
| 16 | Leanna S. Owen | 50 | Wife | — | New York |
| 17 | Mckinley J. Ruddell | 38 | Head | Payroll Clerk | Georgia |
| 18 | Consuelo B. Ruddell | 34 | Wife | — | Philippine Islands |
| 19 | Martha Lee Ruddell | 6 | Daughter | — | California |
| 20 | Stanley Wehen | 49 | Head | Auditor & Trustee | Australia |
| 21 | Dorothy Dew. Wehen | 43 | Wife | — | Illinois |
| 22 | Joy Wehen | 13 | Daughter | — | Straight Settlement |
| 23 | Glenn E. Pitts | 30 | Head | Salesman Oil Well Supplies | California |
| 24 | Lola M. Pitts | 28 | Wife | — | Arkansas |
| 25 | Valerie L. Pitts | 3 | Daughter | — | California |
| 26 | George E. Weymier | 52 | Head | Auto Metal & Supplies Salesman | Wisconsin |
| 27 | Adele Weymier | 50 | Wife | — | Iowa |
| 28 | Edna Eugenia Weymier | 22 | Daughter | Bookkeeper | California |
| 29 | Charles R. Fletcher | 26 | Head | Wholesale Meat Salesman | California |
| 30 | Jeanne M. Fletcher | 22 | Wife | — | California |
| 31 | James L. Fletcher | 2 | Son | — | California |
| 32 | Edward C. Kearney | 45 | Head | Pro-Manager | Iowa |
| 33 | Margaret B. Kearney | 33 | Wife | — | Missouri |
| 34 | Patricia H. Kearney | 11 | Daughter | — | California |
| 35 | Thomas H. Kearney | 9 | Son | — | California |
| 36 | T. Parvin Cook | 49 | Head | Shipping & Receiving Clerk | Indiana |
| 37 | Hazel W. Cook | 45 | Wife | — | Missouri |
| 38 | Carolyn Lee Cook | 15 | Daughter | — | California |
| 39 | D. Smiley Cook | 10 | Daughter | — | California |
| 40 | Frank E. Collier | 57 | Head | Contract Gardener | Iowa |
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)