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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a head (b.~1906), then head of a 6-person household.
Age 34
b. ~1906
Female
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Operator |
| Industry | Garment Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 600 |
| Highest Grade | No 0 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Operator |
| Township / Ward | Los Angeles City |
| Est. Birth Year | ~1906 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Arthur Lopez | Son | — | 14 | ~1926 |
| Mary Lopez | Head | — | 34 | ~1906 |
| Henry Lopez | Son | — | 15 | ~1925 |
| Florence Lopez | Daughter | — | 12 | ~1928 |
| David Lopez | Son | — | 10 | ~1930 |
| Vera Lopez | Daughter | — | 8 | ~1932 |
Census Appearances
1930
Los Angeles, …
Other, age 24
Los Angeles, California · implied b. ~1906 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | Mexican |
| Age | 24 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 17 |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Servant |
| Industry | Private home |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Head, age 34
Los-Angeles-County, California · implied b. ~1906 — 6 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Operator |
| Industry | Garment Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 600 |
| Highest Grade | No 0 |
| 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 Mary Lopez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lopez
Head · 1940 · age 34 · b. ~1906 · 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-t0627-00385-00480)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Adolph Mesa | 40 | Head | Salesman | Puerto Rico |
| 42 | Theresa Mesa | 30 | Wife | — | Mexico |
| 43 | Richard Mesa | 9 | Son | — | Texas |
| 44 | Gilbert Mesa | 8 | Son | — | California |
| 45 | Maria Lara | 52 | Mother in Law | — | Mexico |
| 46 | Petra Espinoza | 53 | Head | — | Mexico |
| 47 | Cama Espinoza | 16 | Daughter | — | Texas |
| 48 | Hortensia Lopez | 35 | Head | — | Arizona |
| 49 | Helen Lopez | 18 | Daughter | — | California |
| 50 | Ruth Lopez | 17 | Daughter | — | Arizona |
| 51 | Jessie Lopez | 16 | Son | — | California |
| 52 | Rafael Kopitsky | 43 | Head | Cook | Russia |
| 53 | Bennie Kopitsky | 44 | Brother | Cook | Russia |
| 54 | Melton Brash | 26 | Head | Clerk | Michigan |
| 55 | Helen Brash | 26 | Wife | — | California |
| 56 | Juana Montoya | 37 | Head | — | Mexico |
| 57 | Adaline Montoya | 9 | Daughter | — | California |
| 58 | Alice Montoya | 8 | Daughter | — | California |
| 59 | Emma Montoya | 5 | Daughter | — | California |
| 60 | Manuel Castello | 37 | Head | Laborer | Mexico |
| 61 | Catalina Castello | 30 | Wife | — | Mexico |
| 62 | Rudy Castello | 10 | Son | — | California |
| 63 | Odelia Castello | 6 | Daughter | — | California |
| 64 | Esther Castello | 4 | Daughter | — | California |
| 65 | Mary Lopez THIS PERSON | 34 | Head | Operator | California |
| 66 | Henry Lopez | 15 | Son | — | California |
| 67 | Arthur Lopez | 14 | Son | — | California |
| 68 | Florence Lopez | 12 | Daughter | — | California |
| 69 | David Lopez | 10 | Son | — | California |
| 70 | Vera Lopez | 8 | Daughter | — | California |
| 71 | Louise Aguerra | 22 | Head | Packer | Arizona |
| 72 | Annie Aguerra | 10 | Daughter | — | California |
| 73 | Adriana Acuna | 52 | Mother | — | Mexico |
| 74 | Ramona Vizcarra | 51 | Head | — | Mexico |
| 75 | Robert Vizcarra | 21 | Son | — | California |
| 76 | Oscar Vizcarra | 15 | Son | — | California |
| 77 | Charles Staloff | 43 | Lodger | Salesman | Bulgaria |
| 78 | Morris Gardner | 46 | Lodger | Cleaner | Russia |
| 79 | Louis Inies | 67 | Lodger | Cook | Russia |
| 80 | Harold Lieberman | 29 | Lodger | Repairman | New York |
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)