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Lydia Williams — 1930 US Census Record
Linked across censuses1930 United States Federal Census · San Francisco, California
Our Model Tree links this Lydia Williams across the 1930 and 1940 US Censuses in San Francisco, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 6-person household.
Age 7
b. ~1923
Female
Daughter
Born: California
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | San Francisco, California |
| Surname | Williams |
| Given Name | Lydia |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Missouri |
| Mother's Birthplace | North Carolina |
| Additional Details | |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Francisco City |
| Est. Birth Year | ~1923 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Lydia | Age | Birth yr |
|---|---|---|---|---|
| Marie Williams | Spouse | — | 46 | ~1884 |
| Ralph Williams | Head | — | 48 | ~1882 |
| Robert Williams | Son | — | 11 | ~1919 |
| Ralph Williams | Son | — | 18 | ~1912 |
| Lydia Williams | Daughter | — | 7 | ~1923 |
| Margaret Williams | Daughter | — | 20 | ~1910 |
Census Appearances
1930
San Francisco, …
Daughter, age 7
San Francisco, California · implied b. ~1923 — 6 household members
| Surname | Williams |
| Given Name | Lydia |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Missouri |
| Mother's Birthplace | North Carolina |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Daughter, age 17
San-Francisco-County, California · implied b. ~1923 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Leda |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco City |
| 1935 Residence (County) | San Francisco |
| Highest Grade | H-2 |
| 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 Lydia Williams across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lydia Williams
Daughter · 1930 · age 7 · b. ~1923 · California
★ You are viewing this record
Sibling
Robert Williams
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Williams
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Williams
Sibling · 1930 · age 18
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
1930 US Federal Census — San Francisco, California
Open full size
1930 US Federal Census — San Francisco, California
Page Contents
50 people indexed on this census page (ia:1930:californiacensus00reel203:0342)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Ralph Williams | 48 | Head | Clerk | Missouri |
| 52 | Marie Williams | 46 | Wife | — | North Carolina |
| 53 | Margaret Williams | 20 | Daughter | Stenographer | California |
| 54 | Ralph Jr. Williams | 18 | Son | Dispatcher | California |
| 55 | Robert Williams | 11 | Son | — | California |
| 56 | Lydia Williams THIS PERSON | 7 | Daughter | — | California |
| 57 | Thomas Frank | 34 | Head | Lineman | California |
| 58 | Julia L. Frank | 41 | Wife | — | Ireland |
| 59 | Thomas Frank | 2 | Son | — | California |
| 60 | Julia Frank | 1 | Daughter | — | California |
| 61 | Mary Frank | 0 | Daughter | — | California |
| 62 | Thomas Tierney | 34 | Head | Auto Mechanic | California |
| 63 | Julia Tierney | 37 | Wife | — | Canada-E |
| 64 | Madeline Tierney | 6 | Daughter | — | California |
| 65 | Thomasine Tierney | 4 | Daughter | — | California |
| 66 | John L. Coulter | 40 | Head | Salesman | California |
| 67 | Edna Coulter | 42 | Wife | — | California |
| 68 | John L. Jr. Coulter | 16 | Son | — | California |
| 69 | Charles J. Sheriff | 42 | Head | Auto Mechanic | California |
| 70 | Jewell Sheriff | 30 | Wife | — | California |
| 71 | Jewell Sheriff | 15 | Daughter | — | California |
| 72 | Frances Sheriff | 13 | Daughter | — | California |
| 73 | Ella Sheriff | 67 | Mother | — | Germany |
| 74 | Warren Sheriff | 35 | Brother | Broker | California |
| 75 | Myrtle Sheriff | 30 | Sister | Bookkeeper | California |
| 76 | George E. Jacobs | 56 | Lodger | Radio Operator | Germany |
| 77 | Arnold 516 | 51 | Head | Salesman | Ireland |
| 78 | Margaret Arnold | 48 | Wife | — | California |
| 79 | Vint 514 | 35 | Head | Salesman | California |
| 80 | Mildred Vint | 25 | Wife | — | Missouri |
| 81 | Mary Lou Vint | 4 | Daughter | — | California |
| 82 | Thomas 512 | 46 | Head | Foreman | California |
| 83 | Edna Thomas | 41 | Wife | — | Iowa |
| 84 | Schwarz 510 | 41 | Head | Broker | California |
| 85 | Edna Schwarz | 38 | Wife | — | California |
| 86 | Ruth Schwarz | 16 | Daughter | Stenographer | California |
| 87 | 175 500 | None | Silva | — | — |
| 88 | Mary Silva | 41 | Wife | — | Azores |
| 89 | Victor Silva | 19 | Son | — | California |
| 90 | Theresa Silva | 17 | Daughter | — | California |
| 91 | Lucille Silva | 15 | Daughter | — | California |
| 92 | Jones 502 | 53 | Head | Contractor | Michigan |
| 93 | Mary Jones | 48 | Wife | — | Italy |
| 94 | Lucille Jones | 18 | Daughter | Secretary | California |
| 95 | 177 504 | None | Belcher | — | — |
| 96 | Ethel Belcher | 28 | Wife | — | California |
| 97 | Arthur Jr. Belcher | 6 | Son | — | California |
| 98 | Robert Belcher | 4 | Son | — | California |
| 99 | 178 506 | None | Burke | — | — |
| 100 | Marie Burke | 61 | Wife | — | Germany |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)