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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Imperial-County, California
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in Imperial-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 7-person household.
Age 18
b. ~1922
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Imperial-County, California |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Imperial |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 8 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Judicial Township 1 |
| Est. Birth Year | ~1922 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lopez | Daughter | — | 18 | ~1922 |
| Lucy Lopez | Daughter | — | 8 | ~1932 |
| Carmen Lopez | Daughter | — | 14 | ~1926 |
| Manuel Lopez | Head | — | 52 | ~1888 |
| Alice Lopez | Daughter | — | 10 | ~1930 |
| Lupe Lopez | Daughter | — | 16 | ~1924 |
| Luz Lopez | Spouse | — | 42 | ~1898 |
Census Appearances
1930
Imperial, California
Other, age 6
Imperial, California · implied b. ~1924 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Boarder-Daughter |
| Sex | F |
| Color / Race | Mexican |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Mexico |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Imperial-County, California
Daughter, age 18
Imperial-County, California · implied b. ~1922 — 7 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Imperial |
| Industry | 0 |
| Highest Grade | No 8 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lopez
Daughter · 1940 · age 18 · b. ~1922 · California
★ You are viewing this record
Sibling
Carmen Lopez
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Lopez
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucy Lopez
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lupe Lopez
Sibling · 1940 · age 16
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 — Imperial-County, California
Open full size
1940 US Federal Census — Imperial-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00209-00200)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charlie Laney | 27 | Head | Laborer | New Mexico |
| 2 | Alice Laney | 20 | Wife | 0 | Texas |
| 3 | Betty Laney | 1 | Daughter | — | Texas |
| 4 | M. E. Collins | 55 | Head | Laborer | Mississippi |
| 5 | Margaret Collins | 49 | Wife | — | Arkansas |
| 6 | Hollis Collins | 29 | Son | Laborer | Oklahoma |
| 7 | Katherine Collins | 16 | Daughter | — | Oklahoma |
| 8 | M. E. Jr Collins | 13 | Son | — | Oklahoma |
| 9 | Martha Collins | 11 | Daughter | — | Texas |
| 10 | Russel Watkins | 26 | Son in law | Laborer | Oklahoma |
| 11 | Lorene Watkins | 19 | Daughter | — | Oklahoma |
| 12 | Lometer Montgomery | 32 | Head | — | Oklahoma |
| 13 | Mary A Montgomery | 12 | Daughter | — | Oklahoma |
| 14 | Corenda Montgomery | 11 | Daughter | — | Oklahoma |
| 15 | Ruby Lee Montgomery | 9 | Daughter | — | Oklahoma |
| 16 | M J Montgomery | 4 | Son | — | Oklahoma |
| 17 | Herbert Dornt | 59 | Head | Farmer | — |
| 18 | Manuel Arce | 56 | Head | Laborer | Mexico |
| 19 | Josefa Arce | 43 | Wife | — | Mexico |
| 20 | Teresa Arce | 19 | Daughter | — | Mexico |
| 21 | Manuel Lopez | 52 | Head | 54 | Texas |
| 22 | Luz Lopez | 42 | Wife | — | Mexico |
| 23 | Mary Lopez THIS PERSON | 18 | Daughter | — | California |
| 24 | Lupe Lopez | 16 | Daughter | — | California |
| 25 | Carmen Lopez | 14 | Daughter | — | California |
| 26 | Alice Lopez | 10 | Daughter | — | California |
| 27 | Lucy Lopez | 8 | Daughter | — | California |
| 28 | Lorenzo Castro | 29 | Head | Farm Laborer | Mexico |
| 29 | Manuela Castro | 16 | Wife | — | Mexico |
| 30 | Rosario Castro | 1 | Daughter | — | California |
| 31 | Estanislao Castro | 19 | Brother | Farm Laborer | Mexico |
| 32 | Henry Cota | 23 | Head | Farm Laborer | Mexico |
| 33 | Santana Cota | 58 | Mother | — | Mexico |
| 34 | Mary Cota | 21 | Sister | — | Mexico |
| 35 | Lina Cota | 18 | Mother | Farm Laborer | Mexico |
| 36 | Martiniano Sanchez | 49 | Lodger | Farm Laborer | Mexico |
| 37 | Gust Pappas | 67 | Head | Farmer | Greece |
| 38 | John Emanuel | 65 | Partner | Farm Laborer | Greece |
| 39 | Orville Pruett | 17 | Head | 54 | Texas |
| 40 | Herschell Pruett | 19 | Brother | 54 | 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)