MP
Mary Preston — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this Mary Preston across the 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 8-person household.
Age 12
b. ~1928
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Preston |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Calif |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Diego |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| Fanny Garcia | Other | — | 20 | ~1920 |
| Arthur Preston | Son | — | 10 | ~1930 |
| Mary Preston | Daughter | — | 12 | ~1928 |
| R Preston | Head | — | 35 | ~1905 |
| Leonard Preston | Son | — | 1 | ~1939 |
| Patricia Preston | Daughter | — | 2 | ~1938 |
| Raymond Preston | Son | — | 7 | ~1933 |
| Maud Preston | Spouse | — | 33 | ~1907 |
Census Appearances
1930
San Diego, …
Daughter, age 2
San Diego, California · implied b. ~1928 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Preston |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Diego-County, California
Daughter, age 12
San-Diego-County, California · implied b. ~1928 — 8 household members
| Surname | Preston |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Highest Grade | 5 |
| 1935 Residence | Calif |
| 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 Preston across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Preston
Daughter · 1940 · age 12 · b. ~1928 · California
★ You are viewing this record
Sibling
Arthur Preston
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Preston
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Preston
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Preston
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
1940 US Federal Census — San-Diego-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00448-00583)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gadoc C. Baxter | 27 | Head | Accountant | Massachusetts |
| 2 | Philomene Baxter | 53 | Wife | Saleslady | Texas |
| 3 | John J. O'Donnell | 78 | Head | — | Ohio |
| 4 | Mary O'Donnell | 58 | Wife | — | New York |
| 5 | Rudolph Hoffman | 73 | Head | Medical Doctor | Ohio |
| 6 | Cora Alice Hoffman | 72 | Wife | — | Ohio |
| 7 | Archie Covey | 51 | Head | Storekeeper | Illinois |
| 8 | Vesta M. Covey | 47 | Wife | — | Ohio |
| 9 | Edwina M. Covey | 21 | Son | Mechanic | California |
| 10 | William Covey | 15 | Son | — | California |
| 11 | Robert Covey | 13 | Son | — | California |
| 12 | Charles Covey | 8 | Son | — | California |
| 13 | Carl M. O'Briant | 28 | Son-in-law | Storekeeper | Alabama |
| 14 | Margery O'Briant | 23 | Daughter | — | California |
| 15 | Marilynne O'Briant | 3 | Granddaughter | — | California |
| 16 | R. A. Preston | 35 | Head | Superintendent Foreman | Iowa |
| 17 | Maud E. Preston | 33 | Wife | — | Oklahoma |
| 18 | Mary Lou Preston THIS PERSON | 12 | Daughter | — | California |
| 19 | Arthur Preston | 10 | Son | — | California |
| 20 | Raymond Preston | 7 | Son | — | California |
| 21 | Patricia Jane Preston | 2 | Daughter | — | California |
| 22 | Leonard A. Preston | 1 | Son | — | California |
| 23 | Fanny Garcia | 20 | Maid | Servant | California |
| 24 | Frank O. Riddel | 72 | Head | — | New York |
| 25 | Myra Riddel | 66 | Wife | — | Pennsylvania |
| 26 | William R. Branson | 27 | Head | General Helper | Missouri |
| 27 | Vloretta Branson | 29 | Wife | — | Missouri |
| 28 | Barbara L. Branson | 5 | Daughter | — | California |
| 29 | William David Branson | 2 | Son | — | California |
| 30 | Martha A. Bickford | 81 | Head | — | Pennsylvania |
| 31 | William R. Lincoln | 23 | Head | Electrician'S Mate | Michigan |
| 32 | Lillian Q. Lincoln | 23 | Wife | — | Michigan |
| 33 | William R. Jr. Lincoln | 1 | Son | — | California |
| 34 | Lynette Lincoln | None | Daughter | — | California |
| 35 | William A. Sharp | 81 | Head | — | Illinois |
| 36 | Grace C. Sharp | 67 | Wife | — | Minnesota |
| 37 | Donald E. Wheeler | 22 | Nephew | Apprentice | Kansas |
| 38 | John C. Ainsworth | 81 | Head | — | Pennsylvania |
| 39 | Walter J. Menzies | 38 | Head | Tile Setter | Colorado |
| 40 | Florence Menzies | 38 | Wife | — | Michigan |
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)