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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Bernardino-County, California
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in San-Bernardino-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 10-person household.
Age 10
b. ~1930
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Bernardino-County, California |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Redlands City |
| 1935 Residence (County) | San Bernardino |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Redlands City |
| Est. Birth Year | ~1930 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lopez | Daughter | — | 10 | ~1930 |
| Lorenzo Lopez | Other | — | 32 | ~1908 |
| Frank Lopez | Head | — | 17 | ~1923 |
| Joe Lopez | Son | — | 6 | ~1934 |
| Rosie Lopez | Daughter | — | 8 | ~1932 |
| Tom Lopez | Other | — | 18 | ~1922 |
| Ambrosia Lopez | Daughter | — | 12 | ~1928 |
| Manuel Lopez | Son | — | 4 | ~1936 |
| Cornelia Lopez | Other | — | 15 | ~1925 |
| Carmen Lopez | Daughter | — | 1 | ~1939 |
Census Appearances
1930
San Bernardino, …
Daughter, age
San Bernardino, California · implied b. ~1930 — 15 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Mexican |
| Age | 0 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Bernardino-County, California
Daughter, age 10
San-Bernardino-County, California · implied b. ~1930 — 10 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Redlands City |
| 1935 Residence (County) | San Bernardino |
| Highest Grade | No 3 |
| 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
Daughter · 1940 · age 10 · b. ~1930 · California
★ You are viewing this record
Sibling
Joe Lopez
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Manuel Lopez
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carmen Lopez
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ambrosia Lopez
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosie Lopez
Sibling · 1940 · age 8
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 — San-Bernardino-County, California
Open full size
1940 US Federal Census — San-Bernardino-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00291-00128)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ednaldo Nakamoto | 30 | Head | Orange Picker | Mexico |
| 42 | Alberto Nakamoto | 23 | Wife | — | California |
| 43 | Martin Mobil | 68 | Head | — | Mexico |
| 44 | Higinia Mobil | 57 | Wife | — | Mexico |
| 45 | Benjamin Avila | 22 | Head | Orange Picker | Mexico |
| 46 | Cesaria Avila | 20 | Wife | — | Mexico |
| 47 | Carmen Avila | 3 | Daughter | — | California |
| 48 | Lawrence Diaz | 38 | Head | Orange Picker | Mexico |
| 49 | Rose Diaz | 32 | Wife | — | California |
| 50 | Sylvino Diaz | 17 | Son | Orange Picker | California |
| 51 | Sylvina Diaz | 15 | Daughter | — | California |
| 52 | Peter Diaz | 14 | Son | — | California |
| 53 | Esther Diaz | 12 | Daughter | — | California |
| 54 | Margaret Diaz | 10 | Daughter | — | California |
| 55 | Lawrence Diaz | 5 | Son | — | California |
| 56 | Josephine Diaz | 5 | Daughter | — | California |
| 57 | Johnnie Diaz | 3 | Son | — | California |
| 58 | Henry Diaz | 2 | Son | — | California |
| 59 | Joseph Diaz | 0 | Son | — | California |
| 60 | Nora Flores | 58 | Mother-in-law | — | Mexico |
| 61 | Helia Gonzalez | 50 | Head | — | Mexico |
| 62 | Cornelia Gonzalez | 44 | Son | Orange Picker | Mexico |
| 63 | Nativiav Gonzalez | 41 | Son | Orange Picker | Mexico |
| 64 | Lupe Gonzalez | 31 | Daughter | — | Mexico |
| 65 | Raymond Padres | 59 | Head | Orange Picker | Mexico |
| 66 | Manuel Palma | 60 | Head | Cement Mixer | Mexico |
| 67 | Carmen Palma | 58 | Wife | — | Mexico |
| 68 | Adele Palma | 13 | Daughter | — | California |
| 69 | Octavio Escobosa | 3 | Son | — | California |
| 70 | Frank Lopez | 17 | Head | Orange Picker | California |
| 71 | Lorenzo Lopez | 32 | Mother | — | Mexico |
| 72 | Tom Lopez | 18 | Brother | Orange Picker | California |
| 73 | Cornelia Lopez | 15 | Brother | — | California |
| 74 | Ambrosia Lopez | 12 | Daughter | — | California |
| 75 | Mary Lopez THIS PERSON | 10 | Daughter | — | California |
| 76 | Rosie Lopez | 8 | Daughter | — | California |
| 77 | Joe Lopez | 6 | Son | — | California |
| 78 | Manuel Lopez | 4 | Son | — | California |
| 79 | Carmen Lopez | 1 | Daughter | — | California |
| 80 | Florenza Chavez | 52 | Head | Field Boss | Texas |
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)