SC
Sarah Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Sarah Cooper across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Cooper |
| Given Name | Sarah |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | LOS ANGELES |
| Additional Details | |
| Highest Grade | S 5 |
| 1935 Residence | Same House |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Los Angeles City |
| Est. Birth Year | ~1929 |
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 1940 census.
| Name | Relation to head | Relative to Sarah | Age | Birth yr |
|---|---|---|---|---|
| Lenora Cooper | Spouse | — | 42 | ~1898 |
| Clarence Cooper | Son | — | 13 | ~1927 |
| Sarah Cooper | Daughter | — | 11 | ~1929 |
| Lenora Cooper | Daughter | — | 4 | ~1936 |
| Leslie Cooper | Son | — | 10 | ~1930 |
| Donald Cooper | Son | — | 2 | ~1938 |
| Clifford Cooper | Son | — | 6 | ~1934 |
| Cleo Cooper | Daughter | — | 20 | ~1920 |
| Walter Cooper | Head | — | 47 | ~1893 |
| Walter Cooper | Son | — | 15 | ~1925 |
Census Appearances
1930
Los Angeles, …
Daughter, age 1
Los Angeles, California · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Sarah |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Mexican |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Arizona |
| Mother's Birthplace | Louisiana |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Daughter, age 11
Los-Angeles-County, California · implied b. ~1929 — 10 household members
| Surname | Cooper |
| Given Name | Sarah |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | LOS ANGELES |
| Highest Grade | S 5 |
| 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 Sarah Cooper across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Sarah Cooper
Daughter · 1940 · age 11 · b. ~1929 · California
★ You are viewing this record
Sibling
Clifford Cooper
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleo Cooper
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clarence Cooper
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Cooper
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lenora Cooper
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Cooper
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leslie Cooper
Sibling · 1940 · age 10
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
1940 US Federal Census — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00382-00165)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Soledad Valdez | 13 | Daughter | — | Arizona |
| 2 | Joe Valdez | 10 | Son | — | California |
| 3 | Rudolfo Valdez | 7 | Son | — | California |
| 4 | Richard Valdez | 7 | Son | — | California |
| 5 | Madilena Valdez | 5 | Daughter | — | California |
| 6 | Walter Cooper | 47 | Head | Pipe Fitter | Texas |
| 7 | Lenora Cooper | 42 | Wife | — | Louisiana |
| 8 | Cleo Cooper | 20 | Daughter | Practical Nurse | Missouri |
| 9 | Walter Cooper | 15 | Son | — | Missouri |
| 10 | Clarence Cooper | 13 | Son | — | California |
| 11 | Sarah Cooper THIS PERSON | 11 | Daughter | — | California |
| 12 | Leslie Cooper | 10 | Son | — | California |
| 13 | Clifford Cooper | 6 | Son | — | California |
| 14 | Lenora Cooper | 4 | Daughter | — | California |
| 15 | Donald Cooper | 2 | Son | — | California |
| 17 | Jose Marquez | 70 | Head | — | Mexico |
| 18 | Sarah Marquez | 53 | Wife | — | Mexico |
| 19 | Josephine Marquez | 23 | Daughter | Packer | Nevada |
| 20 | Manuel Marquez | 20 | Son | Laborer | California |
| 21 | Pasqual Marquez | 19 | Son | New Worker | California |
| 22 | Mary Marquez | 18 | Daughter | Packer | California |
| 23 | Ramona Marquez | 17 | Daughter | — | California |
| 24 | Maria Aparicio | 38 | Head | — | Mexico |
| 25 | Henry Aparicio | 20 | Son | Laborer | Arizona |
| 26 | Concepcion Aparicio | 19 | Daughter | New Worker | Arizona |
| 27 | Jose Aparicio | 16 | Son | — | California |
| 28 | Elena Aparicio | 14 | Daughter | — | California |
| 29 | Selia Aparicio | 13 | Daughter | — | California |
| 30 | Fidel Jimenez | 25 | Head | Core Maker | Arizona |
| 31 | Jennie Jimenez | 25 | Wife | — | Arizona |
| 32 | Arturo Obrigon | 43 | Head | Truck Driver | Arizona |
| 33 | Ramona Obrigon | 35 | Wife | — | Mexico |
| 34 | Alexandro Obrigon | 14 | Son | — | California |
| 35 | Adela Obrigon | 12 | Daughter | — | California |
| 36 | Arturo Obrigon | 11 | Son | — | California |
| 37 | Fernando Obrigon | 8 | Son | — | California |
| 38 | Christine Obrigon | 6 | Daughter | — | California |
| 39 | Ramona Obrigon | 4 | Daughter | — | California |
| 40 | Francisco Obrigon | 3 | Son | — | California |
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)