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Jean Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Jean Smith across the 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 10-person household.
Age 21
b. ~1919
Female
Daughter
Born: Oregon
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Smith |
| Given Name | Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Oregon |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Occupation | Houseworker |
| Industry | P.H. |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 193 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Occupation | Houseworker |
| Township / Ward | Oakland |
| Est. Birth Year | ~1919 |
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 Jean | Age | Birth yr |
|---|---|---|---|---|
| Shirley Smith | Daughter | — | 13 | ~1927 |
| Ruth Smith | Daughter | — | 18 | ~1922 |
| Marion Smith | Daughter | — | 11 | ~1929 |
| Jean Smith | Daughter | — | 21 | ~1919 |
| Kenneth Smith | Head | — | 48 | ~1892 |
| Leonard Smith | Son | — | 19 | ~1921 |
| Louis Smith | Son | — | 25 | ~1915 |
| Jack Smith | Son | — | 17 | ~1923 |
| Norman Smith | Son | — | 8 | ~1932 |
| Marion Smith | Spouse | — | 49 | ~1891 |
Census Appearances
1930
Alameda, California
Daughter, age 11
Alameda, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | California |
| Mother's Birthplace | Missouri |
| Can Read/Write | Yes |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Alameda-County, California
Daughter, age 21
Alameda-County, California · implied b. ~1919 — 10 household members
| Surname | Smith |
| Given Name | Jean |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Oregon |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Occupation | Houseworker |
| Industry | P.H. |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 193 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Jean Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jean Smith
Daughter · 1940 · age 21 · b. ~1919 · California
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Sibling
Louis Smith
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norman Smith
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Shirley Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Smith
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Smith
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Smith
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Smith
Sibling · 1940 · age 18
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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00433-00841)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helena Ferreira | 31 | Sister | Sales Counter | Africa |
| 2 | Antony Ferreira | 65 | Father | — | Portugal |
| 3 | John Ferreira | 36 | Head | Carpenter Helper | Hawaii |
| 4 | Louie Ferreira | 31 | Wife | Spinner | Hawaii |
| 5 | Violet Ferreira | 17 | Daughter | — | California |
| 6 | Gilbert Ferreira | 12 | Son | — | California |
| 7 | William E Lock | 31 | Head | Wagon Driver | Texas |
| 8 | Ruth Lock | 28 | Wife | — | Alabama |
| 9 | Elizabeth Lock | 12 | Daughter | — | California |
| 10 | Iloie Lock | 11 | Daughter | — | California |
| 11 | Mary Evelyn Lock | 9 | Daughter | — | California |
| 12 | Barbara Jean Lock | 1 | Daughter | — | California |
| 13 | Frank W Walters | 48 | Head | Truck Driver | California |
| 14 | Laura Walters | 41 | Wife | — | Wyoming |
| 15 | Kenneth C Smith | 48 | Head | — | California |
| 16 | Marion Smith | 49 | Wife | — | Pennsylvania |
| 17 | Louis Smith | 25 | Son | Sheet Metal | Oregon |
| 18 | Jean Smith THIS PERSON | 21 | Daughter | Houseworker | Oregon |
| 19 | Leonard Smith | 19 | Son | Glassworker | Oregon |
| 20 | Ruth Smith | 18 | Daughter | Stenographer | Oregon |
| 21 | Jack Smith | 17 | Son | — | Oregon |
| 22 | Shirley Smith | 13 | Daughter | — | California |
| 23 | Marion Smith | 11 | Daughter | — | California |
| 24 | Norman Smith | 8 | Son | — | California |
| 25 | Jane Tracy | 75 | Head | — | Ohio |
| 26 | Manuel Mendonca | 55 | Head | Foreman | Portugal |
| 27 | Mary Mendonca | 50 | Wife | — | Portugal |
| 28 | Kathleen Mendonca | 28 | Daughter | Waitress | California |
| 29 | Edward Mendonca | 24 | Son | Laborer | California |
| 30 | John Mendonca | 22 | Son | Baseball | California |
| 31 | Manuel Menezes | 40 | Head | Carman Helper | Honduras |
| 32 | Mary Menezes | 30 | Wife | — | Honduras |
| 33 | Nesta Menezes | 12 | Daughter | — | California |
| 34 | Bernice Menezes | 7 | Daughter | — | California |
| 35 | Arlene Menezes | 2 | Daughter | — | California |
| 36 | Antone Gilberto | 31 | Head | Moulder | Italy |
| 37 | Amelia Gilberto | 25 | Wife | — | California |
| 38 | Audrey Gilberto | 3 | Daughter | — | California |
| 39 | Anita Gilberto | 2 | 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)