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Mary Lucas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Stanislaus-County, California
Our Model Tree links this Mary Lucas across the 1930 and 1940 US Censuses in Stanislaus-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Stanislaus-County, California |
| Surname | Lucas |
| 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) | Stanislaus |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-3 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Turlock |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alice Lucas | Daughter | — | 13 | ~1927 |
| Mary Lucas | Daughter | — | 18 | ~1922 |
| Josephine Lucas | Daughter | — | 17 | ~1923 |
| Mabel Lucas | Daughter | — | 11 | ~1929 |
| Antone Lucas | Head | — | 48 | ~1892 |
| Frank Lucas | Son | — | 19 | ~1921 |
| Raymond Lucas | Son | — | 4 | ~1936 |
| Antone Lucas | Son | — | 9 | ~1931 |
| Joseph Lucas | Son | — | 7 | ~1933 |
| Flura Lucas | Spouse | — | 37 | ~1903 |
Census Appearances
1930
Stanislaus, California
Daughter, age 8
Stanislaus, California · implied b. ~1922 — 47 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lucas |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Azores |
| Mother's Birthplace | Azores |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Stanislaus-County, California
Daughter, age 18
Stanislaus-County, California · implied b. ~1922 — 10 household members
| Surname | Lucas |
| 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) | Stanislaus |
| Income (1939) | 0 |
| Highest Grade | H-3 |
| 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 Lucas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lucas
Daughter · 1940 · age 18 · b. ~1922 · California
★ You are viewing this record
Sibling
Joseph Lucas
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Antone Lucas
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Lucas
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mabel Lucas
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Lucas
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Lucas
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Lucas
Sibling · 1940 · age 19
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 — Stanislaus-County, California
Open full size
1940 US Federal Census — Stanislaus-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00353-00499)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Louise Olsson | 22 | Wife | — | California |
| 42 | Gerald H. Farmer | 30 | Head | Farmer | California |
| 43 | Eva D. Farmer | 28 | Wife | — | Illinois |
| 44 | Wilbur L. Farmer | 37 | Brother | Farmer | California |
| 45 | Vernon J. Hammond | 27 | Nephew | Laborer | Texas |
| 46 | Bertha Hammond | 21 | Wife | — | Oklahoma |
| 47 | Vernon Jr. Hammond | 4 | Son | — | Texas |
| 48 | Vera Hammond | 2 | Daughter | — | Oklahoma |
| 49 | Shirley Hammond | 1 | Daughter | — | California |
| 50 | Andrew Headstrom | 69 | Head | Farmer | Sweden |
| 51 | Lena Headstrom | 70 | Wife | — | Finland |
| 52 | John Espinola | 33 | Head | Operator | Portugal |
| 53 | Mary Espinola | 25 | Wife | Waitress | California |
| 54 | Joel David | 40 | Head | Laborer | Persia |
| 55 | Katie David | 31 | Wife | — | Persia |
| 56 | Bertha David | 11 | Daughter | — | California |
| 57 | Nellie David | 5 | Daughter | — | California |
| 58 | Jesse David | 3 | Son | — | California |
| 59 | Andros Addai | 50 | Head | Farm | Persia |
| 60 | Seroshka Addai | 46 | Wife | — | Persia |
| 61 | Antone S. Lucas | 48 | Head | Farmer | Portugal |
| 62 | Flura Lucas | 37 | Wife | — | Portugal |
| 63 | Frank Lucas | 19 | Son | Helper | California |
| 64 | Mary Lucas THIS PERSON | 18 | Daughter | — | California |
| 65 | Josephine Lucas | 17 | Daughter | — | California |
| 66 | Alice Lucas | 13 | Daughter | — | California |
| 67 | Mabel Lucas | 11 | Daughter | — | California |
| 68 | Antone Jr. Lucas | 9 | Son | — | California |
| 69 | Joseph Lucas | 7 | Son | — | California |
| 70 | Raymond Lucas | 4 | Son | — | California |
| 71 | Frank Azvedo | 28 | Head | Farmer | California |
| 72 | Ermaline Azvedo | 24 | Wife | — | California |
| 73 | Daniel Azvedo | 3 | Son | — | California |
| 74 | Barbara Azvedo | 1 | Daughter | — | California |
| 75 | David Azvedo | 0 | Son | — | California |
| 76 | Peter B. Hansen | 76 | Head | Farmer | Denmark |
| 77 | Martha Hansen | 66 | Wife | — | Denmark |
| 78 | Esta Urye | 49 | Head | Maid | Kansas |
| 79 | Versaurel Urye | 13 | Daughter | — | Iowa |
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)