MT
Mary Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Thomas across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents John & John — first a spouse (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Female
Spouse
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Thomas |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Los Angeles City |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Owen Thomas | Head | — | 29 | ~1911 |
| Robert Thomas | Son | — | 3 | ~1937 |
| James Thomas | Son | — | 5 | ~1935 |
| Mary Thomas | Spouse | — | 24 | ~1916 |
Census Appearances
1920
Los Angeles, …
Daughter, age 4
Los Angeles, California · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Mother Tongue | Portuguese |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Daughter, age 15
Los Angeles, California · implied b. ~1915 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Mary H. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Spouse, age 24
Los-Angeles-County, California · implied b. ~1916 — 4 household members
| Surname | Thomas |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Thomas (~0.92 confidence) and father John Thomas (~0.92 confidence) and mother Mary Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Thomas
b. ~1870
Source father
● Household
· direct · ~0.92
Father
John Thomas
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Mary Thomas
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Thomas
Spouse · 1940 · age 24 · b. ~1916 · California
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00424-00451)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clifford Aiken | 34 | Lodger | Mechanic | Kentucky |
| 42 | Vincente Aranda | 34 | Head | Cook | Texas |
| 43 | Carmen Aranda | 35 | Wife | — | Mexico |
| 44 | Irene Aranda | 12 | Daughter | — | California |
| 45 | Ceciela Willhelsen | 50 | Head | — | Illinois |
| 46 | John Wilson | 71 | Lodger | — | Ohio |
| 47 | Emile Gomez | 52 | Head | Waiter | Switzerland |
| 48 | Gregoria Gomez | 53 | Wife | — | Chile |
| 50 | Leonard Ross | 39 | Head | Truck Loading Foreman | Wisconsin |
| 51 | Alvina Ross | 29 | Wife | — | Wisconsin |
| 52 | Darlene Ross | 9 | Daughter | — | Wisconsin |
| 53 | Carl Miller | 30 | Head | Office Worker | Michigan |
| 54 | Edna Miller | 27 | Wife | Clerk | Michigan |
| 55 | Ronald Miller | 3 | Son | — | California |
| 56 | John Benes | 65 | Head | Machinist | Czechoslovakia |
| 57 | Mary Benes | 55 | Wife | — | Austria |
| 58 | Paul Benes | 18 | Son | — | California |
| 59 | Jesse Matthews | 53 | Head | Bartender | Oklahoma |
| 60 | Clara Matthews | 55 | Wife | — | Oklahoma |
| 61 | Oscar Carlson | 56 | Head | Water Meter Reader | Illinois |
| 62 | Ethel Carlson | 54 | Wife | — | Illinois |
| 63 | Peter Bach | 78 | Head | — | Sweden |
| 64 | Anna Bach | 79 | Wife | — | Illinois |
| 65 | Owen Thomas | 29 | Head | Loan Clerk | Wyoming |
| 66 | Mary Thomas THIS PERSON | 24 | Wife | — | California |
| 67 | James Thomas | 5 | Son | — | California |
| 68 | Robert Thomas | 3 | Son | — | California |
| 69 | James Doherty | 54 | Head | Estimator | Massachusetts |
| 70 | Sophie Doherty | 52 | Wife | — | Arizona |
| 71 | James Jr. Doherty | 27 | Son | Salesman | California |
| 72 | Andrew Doherty | 25 | Son | Machinist | California |
| 73 | Joseph Doherty | 23 | Son | Machinist | California |
| 74 | Gerard Doherty | 21 | Son | Bookkeeper | California |
| 75 | Virginia Doherty | 18 | Daughter | Stenographer | California |
| 76 | Richard Doherty | 17 | Son | — | California |
| 77 | Patrick Doherty | 15 | Son | — | California |
| 78 | Betty Doherty | 12 | Daughter | — | California |
| 79 | Hans Thomsen | 41 | Head | Can Washer | Denmark |
| 80 | Lilly Thomsen | 34 | Wife | — | Denmark |
Pedigree Summary
Mary
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)