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Mary Martinez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Martinez across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Female
Daughter
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Conejos |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Township / Ward | Los Angeles City |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| Walter Martinez | Son | — | 20 | ~1920 |
| Gaspar Lucero | Other | — | 12 | ~1928 |
| Antonio Martinez | Head | — | 55 | ~1885 |
| Mary Martinez | Daughter | — | 12 | ~1928 |
| Tony Martinez | Son | — | 21 | ~1919 |
| Amelia Martinez | Spouse | — | 54 | ~1886 |
| Leo Lucero | Other | — | 6 | ~1934 |
Census Appearances
1930
Los Angeles, …
Daughter, age 2
Los Angeles, California · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martinelli |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Los-Angeles-County, California
Daughter, age 12
Los-Angeles-County, California · implied b. ~1928 — 7 household members
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Conejos |
| Highest Grade | No 6 |
| 1935 Residence | Colorado |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Martinez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Martinez
Daughter · 1940 · age 12 · b. ~1928 · California
★ You are viewing this record
Sibling
Walter Martinez
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Tony Martinez
Sibling · 1940 · age 21
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
40 people indexed on this census page (nara:1940:m-t0627-00379-00492)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Prim Ortega | 51 | Head | Paper-Baler | New Mexico |
| 42 | Beatrice Ortega | 38 | Wife | — | New Mexico |
| 43 | Hortense Ortega | 18 | Daughter | — | New Mexico |
| 44 | Pino Ortega | 12 | Son | — | New Mexico |
| 45 | Minnie Ortega | 3 | Granddaughter | — | New Mexico |
| 46 | Mary Anne Ortega | 0 | Granddaughter | — | California |
| 47 | Michaela Lotito | 78 | Head | — | Italy |
| 48 | Christopher Lotito | 50 | Son | Manager | Italy |
| 49 | Nellie Martinez | 35 | Head | Shirt-Ironer | Mexico |
| 50 | Ralph Martinez | 15 | Son | — | California |
| 51 | Jose Herrera | 69 | Head | — | Mexico |
| 52 | Gumersinda Herrera | 67 | Wife | — | Mexico |
| 53 | Raymond Herrera | 21 | Son | — | Texas |
| 54 | Antonio Martinez | 55 | Head | — | Colorado |
| 55 | Amelia Martinez | 54 | Wife | — | Colorado |
| 56 | Mary Martinez THIS PERSON | 12 | Daughter | — | Colorado |
| 57 | Tony Martinez | 21 | Son | Pantry Man | Colorado |
| 58 | Walter Martinez | 20 | Son | Laborer | Colorado |
| 59 | Gaspar Lucero | 12 | Grandson | — | Colorado |
| 60 | Leo Lucero | 6 | Grandson | — | Colorado |
| 61 | Nicolasa Carbajal | 62 | Head | — | Mexico |
| 62 | Ascension Carbajal | 47 | Daughter | Power Machine Operator | Mexico |
| 63 | Lazaro Carbajal | 31 | Son | Clothes Washer | Mexico |
| 64 | Danilo Carbajal | 31 | Daughter-in-law | — | Mexico |
| 65 | Elisa Carbajal | 9 | Granddaughter | — | Arizona |
| 66 | Otilia Carbajal | 6 | Granddaughter | — | Arizona |
| 67 | Rosa Carbajal | 17 | Neice | — | Texas |
| 68 | Frank Gaitam | 36 | Head | Jack Hammer Operator | Mexico |
| 69 | Francisca Gaitam | 33 | Wife | — | Mexico |
| 70 | Julietta Gaitam | 11 | Daughter | — | Arizona |
| 71 | Juan Ramirez | 52 | Head | Upholsterer | Mexico |
| 72 | Febronia Ramirez | 36 | Wife | — | Mexico |
| 73 | Mary Louise Ramirez | 16 | Daughter | — | Texas |
| 74 | Concha Ramirez | 13 | Daughter | — | Texas |
| 75 | Lucy Ramirez | 11 | Daughter | — | Texas |
| 76 | Apolonio Ramirez | 9 | Daughter | — | Texas |
| 77 | Harry Song | 46 | Head | Manager | China |
| 78 | Sena Song | 41 | Wife | Manager | Canada English |
| 79 | Lucille Song | 13 | Daughter | — | California |
| 80 | Patricia Song | 5 | Daughter | — | 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)