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Mary Lopez — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Lopez across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Frank & Luis — first a spouse (b.~1917), then head of a 3-person household.
Age 23
b. ~1917
Female
Spouse
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | La Verne |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | La Verne City |
| Est. Birth Year | ~1917 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eugene Lopez | Head | — | 22 | ~1918 |
| Alfred Lopez | Son | — | 1 | ~1939 |
| Mary Lopez | Spouse | — | 23 | ~1917 |
Census Appearances
1920
Los Angeles, …
Daughter, age 2
Los Angeles, California · implied b. ~1918 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Occupation | none |
| Speaks English | Yes |
| Mother Tongue | Spanish |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Daughter, age 12
Los Angeles, California · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Mexican |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Spouse, age 23
Los-Angeles-County, California · implied b. ~1917 — 3 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | La Verne |
| 1935 Residence (County) | Los Angeles |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | California |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Lopez (~0.92 confidence) and father Luis Lopez (~0.92 confidence) and mother Ramona Lopez (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Lopez
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Luis Lopez
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Ramona Lopez
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Lopez
Spouse · 1940 · age 23 · b. ~1917 · California
★ You are viewing this record
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-t0627-00255-00167)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Modesto Lopez | 9 | son | — | California |
| 2 | Joe (X) Lopez | 7 | son | — | California |
| 3 | Sally Lopez | 4 | daughter | — | California |
| 4 | Eugene Lopez | 22 | Head | Orange Picker | California |
| 5 | Mary Lopez THIS PERSON | 23 | wife | — | California |
| 6 | Alfred Lopez | 1 | son | — | California |
| 7 | Vincent Ortega | 40 | Head | Laborer | Mexico |
| 8 | Mary (X) Ortega | 36 | wife | — | Arizona |
| 9 | Carmen Ortega | 20 | daughter | Orange Packer | Arizona |
| 10 | Leopoldda Ortega | 14 | daughter | — | California |
| 11 | Aquilia Ortega | 12 | daughter | — | California |
| 12 | Eulophia Ortega | 10 | daughter | — | California |
| 13 | Ralph Ortega | 7 | son | — | California |
| 14 | Billie Ortega | 4 | son | — | California |
| 15 | Robert Ortega | 1 | son | — | California |
| 16 | Ramallo Medina | 35 | Head | Fruit Picker | Mexico |
| 17 | Cipriana (X) Medina | 27 | wife | — | Mexico |
| 18 | Lupe Medina | 6 | daughter | — | California |
| 19 | Manuel Medina | 4 | son | — | California |
| 20 | Paul Medina | 3 | son | — | California |
| 21 | Petra Medina | 1 | son | — | California |
| 22 | Richard Medina | 0 | son | — | California |
| 23 | Joe Gonzalas | 51 | Head | Laborer | Mexico |
| 24 | Macedonia Gonzalas | 50 | wife | — | Mexico |
| 25 | Jesse (X) Gonzalas | 23 | daughter | — | Mexico |
| 26 | Ernest Gonzalas | 17 | son | Fruit Picker | Mexico |
| 27 | Connie Gonzalas | 15 | daughter | — | California |
| 28 | Juana Gonzalas | 11 | daughter | — | California |
| 29 | Joe Gonzalas | 10 | son | — | California |
| 30 | Richard Gonzalas | 5 | son | — | California |
| 31 | Esteban Duran | 35 | Head | — | Mexico |
| 32 | Justina Duran | 26 | wife | — | Mexico |
| 33 | Rachel Duran | 10 | daughter | — | California |
| 34 | Frances Duran | 8 | son | — | California |
| 35 | Polonia Duran | 6 | daughter | — | California |
| 36 | Juan Duran | 4 | son | — | California |
| 37 | Porfirio Duran | 3 | son | — | California |
| 38 | Gloria X Duran | 0 | daughter | — | California |
| 39 | Pablo Ruiz | 66 | Head | — | Mexico |
| 40 | Isidra Ruiz | 46 | wife | — | Mexico |
Pedigree Summary
Mary
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)