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Billie Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this Billie Smith across the 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Female
Spouse
Born: New Mexico
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Smith |
| Given Name | Billie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | New Mexico |
| 1935 Residence (City) | San Diego City |
| 1935 Residence (County) | San Diego |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | New Mexico |
| Birth Country | United States |
| Birthplace (normalized) | new mexico |
| Township / Ward | San Diego City |
| Est. Birth Year | ~1918 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Billie | Age | Birth yr |
|---|---|---|---|---|
| William Smith | Head | — | 27 | ~1913 |
| Billie Smith | Spouse | — | 22 | ~1918 |
| Marilyn Smith | Daughter | — | 5 | ~1935 |
Census Appearances
1930
San Diego, …
Daughter, age 12
San Diego, California · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Billie J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Mexico |
| Father's Birthplace | Texas |
| Mother's Birthplace | Texas |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New Mexico |
| Birth Country | United States |
| Birthplace (normalized) | new mexico |
1940
San-Diego-County, California
Spouse, age 22
San-Diego-County, California · implied b. ~1918 — 3 household members
| Surname | Smith |
| Given Name | Billie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | New Mexico |
| 1935 Residence (City) | San Diego City |
| 1935 Residence (County) | San Diego |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | New Mexico |
| Birth Country | United States |
| Birthplace (normalized) | new mexico |
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 Billie Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Billie Smith
Spouse · 1940 · age 22 · b. ~1918 · 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-Diego-County, California
Open full size
1940 US Federal Census — San-Diego-County, California
Page Contents
12 people indexed on this census page (nara:1940:m-t0627-00452-00341)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 42 | Luther C. Gray | 42 | Head | Wire Chief | Texas |
| 43 | Eudora Gray | 34 | Wife | — | Arkansas |
| 44 | Norman E. Gray | 11 | Son | — | California |
| 46 | William L. Smith | 27 | Head | Water Tender | Arkansas |
| 47 | Billie Smith THIS PERSON | 22 | Wife | — | New Mexico |
| 48 | Marilyn Smith | 5 | Daughter | — | California |
| 54 | Wm W Armstrong | 36 | Head | B. M. 2/C | Nebraska |
| 55 | Thelma P Armstrong | 25 | Wife | — | Colorado |
| 56 | Wm F Armstrong | 2 | Son | — | California |
| 57 | Glen H. Young | 57 | Head | — | Michigan |
| 58 | Alice L. Young | 54 | Wife | — | Michigan |
| 59 | Norma J. Armstrong | 4 | Daughter | — | Colorado |
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)