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Mary Lopez — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · San-Diego-County, California

Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 8-person household.

Age 17 b. ~1923 Female Daughter Born: Arizona Single

1940 Census Record Details

Census Year1940
LocationSan-Diego-County, California
SurnameLopez
Given NameMary B
Relationship to HeadDaughter
SexF
Color / RaceWhite
Age17
Marital StatusSingle
BirthplaceArizona
1935 Residence (City)San Diego City
1935 Residence (County)San Diego
Additional Details
OccupationFisherman
IndustryDeep Sea Fishing
Class of WorkerOA
Hours Worked50
Income (1939)700
Highest GradeHs 2
1935 ResidenceSame Place
Birth StateArizona
Birth CountryUnited States
Birthplace (normalized)arizona
OccupationFisherman
Township / WardSan Diego City
Est. Birth Year~1923

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.

8 people recorded at the same address in the 1940 census.

Name Relation to head Relative to Mary Age Birth yr
Tony Gonzales Son — 2 ~1938
Mary Lopez Daughter — 17 ~1923
Prisciliano Lopez Head — 56 ~1884
Lucia Lopez Spouse — 46 ~1894
Ernest Lopez Son — 20 ~1920
Robert Lopez Son — 21 ~1919
Beatrice Lopez Daughter — 25 ~1915
Maudine Sandoval Daughter — 6 ~1934

Census Appearances

1930
San Diego, …
Daughter, age 7
San Diego, California · implied b. ~1923 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Lopez
Given Name Maria V.
Relationship to Head Daughter
Sex F
Color / Race Mexican
Age 7
Marital Status Single
Birthplace Arizona
Father's Birthplace Mexico
Mother's Birthplace Mexico
Can Read/Write Yes
Birth State Arizona
Birth Country United States
Birthplace (normalized) arizona
1940
San-Diego-County, California
Daughter, age 17
San-Diego-County, California · implied b. ~1923 — 8 household members
Surname Lopez
Given Name Mary B
Relationship to Head Daughter
Sex F
Color / Race White
Age 17
Marital Status Single
Birthplace Arizona
1935 Residence (City) San Diego City
1935 Residence (County) San Diego
Occupation Fisherman
Industry Deep Sea Fishing
Class of Worker OA
Hours Worked 50
Income (1939) 700
Highest Grade Hs 2
1935 Residence Same Place
Birth State Arizona
Birth Country United States
Birthplace (normalized) arizona

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.
Linked across censuses
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 17 · b. ~1923 · California
★ You are viewing this record
Sibling
Beatrice Lopez
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maudine Sandoval
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Lopez
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ernest Lopez
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Tony Gonzales
Sibling · 1940 · age 2
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-Diego-County, California Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-00450-00462)

Line Name Age Relation Occupation Birthplace
1 Martha S Otto 80 Head — California
2 Stella M Torres 40 Niece — California
3 Mary J Robertson 53 Head — Minnesota
4 Charles Spiros 53 Head Fisherman Greece
5 Lester Flick 32 Head Groom Wisconsin
6 Marjorie M Flick 32 Wife — Nebraska
7 Harold F Neal 38 Head Jockey Nebraska
8 Ruby B Neal 39 Wife — Missouri
9 Irene Cullen 13 Niece — Washington
10 Benita R Watson 22 Head — Washington
11 Helen C Sanker 20 Head Packer California
12 Oral V Johnson 56 Head Vender Nebraska
13 Agnes Johnson 60 Wife — Michigan
14 Ole K Lee 72 Head — Norway
15 Felix Lindgrist 85 Head — Poland
16 Luella E Boggs 71 Head — New York
17 Herman H Hall 33 Head Painter Missouri
18 Vera M Hall 28 Wife — Mississippi
19 Joseph De Prineppe 21 Head Fireman Missouri
20 Marie O De Prineppe 19 Wife — Massachusetts
21 John Norton 72 Head — Ohio
22 William Norton 34 Son Carpenter Colorado
23 James C Thompson 27 Head Radioman Michigan
24 Anna A Thompson 20 Wife — New York
25 Prisciliano Lopez 56 Head — Mexico
26 Lucia C Lopez 46 Wife — Mexico
27 Robert Lopez 21 Son Laundress Arizona
28 Ernest Lopez 20 Son Fisherman Arizona
29 Mary B Lopez THIS PERSON 17 Daughter Fisherman Arizona
30 Beatrice R Lopez 25 Daughter — Arizona
31 Tony P Gonzales 2 Son — California
32 Maudine Sandoval 6 Daughter — California
33 Addison J Simpson 56 Head Salesman Tennessee
34 Myrtle E Simpson 67 Wife — Iowa
35 Lester D Purdy 35 Lodger Auto Mechanic Kansas
36 Lois E Stansberry 27 Head Laborer Iowa
37 Jean R Mickelson 57 Head — California
38 Millbourne Moore 27 Head Ship'S Cook Texas
39 Ola M Moore 28 Wife — Kentucky

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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)

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