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Mary Martinez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this Mary Martinez across the 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Female
Spouse
Born: Spain
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Spain |
| 1935 Residence (City) | San Mateo |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Alien |
| Additional Details | |
| Hours Worked | 5 |
| Highest Grade | H 6 |
| 1935 Residence | Same place |
| Birth Country | Spain |
| Birthplace (normalized) | spain |
| Est. Birth Year | ~1909 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Isabel Martinez | Daughter | — | 5 | ~1935 |
| Mary Martinez | Daughter | — | 10 | ~1930 |
| Mary Martinez | Spouse | — | 31 | ~1909 |
| Charlie Martinez | Head | — | 33 | ~1907 |
| Joseph Martinez | Son | — | 8 | ~1932 |
Census Appearances
1930
San Mateo, …
Spouse, age 21
San Mateo, California · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Spain |
| Naturalization Status | Alien |
| Year of Immigration | 1913 |
| Age at First Marriage | 19 |
| Father's Birthplace | Spain |
| Mother's Birthplace | Spain |
| Can Read/Write | Yes |
| Mother Tongue | Spanish |
| Birth Country | Spain |
| Birthplace (normalized) | spain |
1940
San-Mateo-County, California
Spouse, age 31
San-Mateo-County, California · implied b. ~1909 — 5 household members
| Surname | Martinez |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Spain |
| 1935 Residence (City) | San Mateo |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Alien |
| Hours Worked | 5 |
| Highest Grade | H 6 |
| 1935 Residence | Same place |
| Birth Country | Spain |
| Birthplace (normalized) | spain |
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
Spouse · 1940 · age 31 · b. ~1909 · 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 — San-Mateo-County, California
Open full size
1940 US Federal Census — San-Mateo-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00331-00570)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Vivian Hanson | 10 | Daughter | — | California |
| 42 | Manuel Ojeda | 48 | Head | Beetender | Spain |
| 43 | Constance Ojeda | 42 | Wife | Canner | Spain |
| 44 | Rosie H. Ojeda | 17 | Daughter | — | California |
| 45 | Manuel Ojeda | 11 | Son | — | California |
| 46 | Walter Wertz | 53 | Head | Hoo Engineer | New York |
| 47 | Carrie Wertz | 53 | Wife | — | South Dakota |
| 48 | Jack Wertz | 20 | Son | New Worker | California |
| 49 | Eda Wertz | 18 | Daughter | Housework | California |
| 50 | Mary Wertz | 15 | Daughter | — | California |
| 51 | Paul Wertz | 13 | Son | — | California |
| 52 | Joseph Rivera | 21 | Head | Laborer | California |
| 53 | Elaine Rivera | 19 | Wife | — | California |
| 54 | Charlie Martinez | 33 | Head | Gardner | Spain |
| 55 | Mary Martinez THIS PERSON | 31 | Wife | — | Spain |
| 56 | Mary Martinez | 10 | Daughter | — | California |
| 57 | Joseph Martinez | 8 | Son | — | California |
| 58 | Isabel Martinez | 5 | Daughter | — | California |
| 59 | Onesime Henneuf | 48 | Head | Lather | France |
| 60 | Antonia Henneuf | 40 | Wife | — | Canada |
| 61 | Germain Henneuf | 10 | Son | — | California |
| 62 | Roland Henneuf | 8 | Son | — | California |
| 63 | Raymond Henneuf | 3 | Son | — | California |
| 64 | Wilfred Waters | 38 | Head | Gardner | Illinois |
| 65 | Beatrice Waters | 36 | Wife | Catering | Nebraska |
| 66 | William Waters | 10 | Son | — | California |
| 67 | Suzanne Waters | 8 | Daughter | — | California |
| 68 | Julius Levy | 63 | Head | — | California |
| 69 | Ida Levy | 65 | Wife | — | Idaho |
| 70 | Tony Roman | 32 | Head | Gardner | Hawaii |
| 71 | Mabel Roman | 26 | Wife | — | Hawaii |
| 72 | Robert Roman | 4 | Son | — | California |
| 73 | Fred Weismann | 68 | Head | Manager | Germany |
| 74 | Minnie Weismann | 65 | Wife | — | California |
| 75 | Claude Viles | 51 | Head | Painter | Missouri |
| 76 | Allie Viles | 42 | Wife | — | Kansas |
| 77 | Nancy Hargis | 66 | Mother-in-law | — | Missouri |
| 78 | Frank Rodriguez | 38 | Head | Burner | Spain |
| 79 | Aurora Rodriguez | 32 | Wife | — | Spain |
| 80 | Sebastian Rodriguez | 14 | Son | — | 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)