LC
Lillian Cook — 1930 US Census Record
Linked across censuses1930 United States Federal Census · San Francisco, California
Our Model Tree links this Lillian Cook across the 1930 and 1940 US Censuses in San Francisco, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 10-person household.
Age 7
b. ~1923
Female
Daughter
Born: California
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | San Francisco, California |
| Surname | Cook |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| 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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Lillian | Age | Birth yr |
|---|---|---|---|---|
| William Cook | Son | — | 3 | ~1927 |
| Lillian Cook | Spouse | — | 32 | ~1898 |
| Lillian Cook | Daughter | — | 7 | ~1923 |
| George Cook | Son | — | 1 | ~1929 |
| Robert Cook | Son | — | 5 | ~1925 |
| Lillian Cook | Daughter | — | ~1930 | |
| John Cook | Son | — | 9 | ~1921 |
| John Cook | Head | — | 35 | ~1895 |
| William Cook | Son | — | ~1930 | |
| Robert Cook | Son | — | ~1930 |
Census Appearances
1930
San Francisco, …
Daughter, age 7
San Francisco, California · implied b. ~1923 — 10 household members
| Surname | Cook |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Daughter, age 18
San-Francisco-County, California · implied b. ~1922 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Leona A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Highest Grade | Hs 4 |
| 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 Lillian Cook across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lillian Cook
Daughter · 1930 · age 7 · b. ~1923 · California
★ You are viewing this record
Sibling
William Cook
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Cook
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cook
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cook
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cook
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Cook
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cook
Sibling · 1930 · age 9
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:californiacensus00reel207:0973)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sylvester Gray | 51 | Head | Salesman | Alabama |
| 2 | Lillian Gray | 45 | Wife | — | California |
| 3 | Sylvester Gray | 25 | Son | Salesman | California |
| 4 | Lillian Gray | 22 | Daughter | — | California |
| 5 | Robert Gray | 20 | Son | — | California |
| 6 | Richard Gray | 18 | Son | — | California |
| 7 | Ira Powers | 34 | Head | — | California |
| 8 | Lucy Powers | 34 | Wife | — | Missouri |
| 9 | Ira Powers | 6 | Son | — | California |
| 10 | Ann Powers | 5 | Daughter | — | California |
| 11 | John Anderson | 22 | Head | — | California |
| 12 | Lillian Anderson | 22 | Wife | — | California |
| 13 | Ruth Anderson | 1 | Daughter | — | California |
| 14 | Grace Anderson | 0 | Daughter | — | California |
| 15 | George Temple | 31 | Head | — | California |
| 16 | Lillian Temple | 28 | Wife | — | California |
| 17 | George Temple | 5 | Son | — | California |
| 18 | Lillian Temple | 3 | Daughter | — | California |
| 19 | Robert Temple | 1 | Son | — | California |
| 20 | William Temple | 0 | Son | — | California |
| 21 | John Boyle | 35 | Head | — | California |
| 22 | Lillian Boyle | 32 | Wife | — | California |
| 23 | John Boyle | 9 | Son | — | California |
| 24 | Lillian Boyle | 7 | Daughter | — | California |
| 25 | Robert Boyle | 5 | Son | — | California |
| 26 | William Boyle | 3 | Son | — | California |
| 27 | John Cook | 35 | Head | — | California |
| 28 | Lillian Cook | 32 | Wife | — | California |
| 29 | John Cook | 9 | Son | — | California |
| 30 | Lillian Cook THIS PERSON | 7 | Daughter | — | California |
| 31 | Robert Cook | 5 | Son | — | California |
| 32 | William Cook | 3 | Son | — | California |
| 33 | George Cook | 1 | Son | — | California |
| 34 | Lillian Cook | 0 | Daughter | — | California |
| 35 | Robert Cook | 0 | Son | — | California |
| 36 | William Cook | 0 | Son | — | California |
| 37 | Sylvester Gray | 51 | Head | Salesman | Alabama |
| 38 | Lillian Gray | 45 | Wife | — | California |
| 39 | Sylvester Gray | 25 | Son | Salesman | California |
| 40 | Lillian Gray | 22 | Daughter | — | California |
| 41 | Robert Gray | 20 | Son | — | California |
| 42 | Richard Gray | 18 | Son | — | California |
| 43 | John Gray | 16 | Son | — | California |
| 44 | Lillian Gray | 14 | Daughter | — | California |
| 45 | Robert Gray | 12 | Son | — | California |
| 46 | William Gray | 10 | Son | — | California |
| 47 | George Gray | 8 | Son | — | California |
| 48 | Lillian Gray | 6 | Daughter | — | California |
| 49 | Robert Gray | 4 | Son | — | California |
| 50 | William Gray | 2 | Son | — | California |
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)