MT
Mary Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Thompson across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Arthur & Angus — first a daughter (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Female
Daughter
Born: England
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Thompson |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | England |
| 1935 Residence (City) | Santa Monica |
| 1935 Residence (County) | Los Angeles |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 9 |
| 1935 Residence | Same Place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Township / Ward | Santa Monica |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Thompson | Daughter | — | 24 | ~1916 |
| Arthur Thompson | Head | — | 66 | ~1874 |
| John Thompson | Other | — | 15 | ~1925 |
| John Thompson | Son | — | 35 | ~1905 |
| Annie Thompson | Spouse | — | 64 | ~1876 |
Census Appearances
1920
Los Angeles, …
Daughter, age 5
Los Angeles, California · implied b. ~1915 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | England |
| Year of Immigration | 1914 |
| Naturalization Status | First papers filed |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Mother Tongue | English |
| Birth Country | England |
| Year of Naturalization | 1917 |
| Birthplace (normalized) | england |
1930
Los Angeles, …
Daughter, age 15
Los Angeles, California · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1917 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Los-Angeles-County, California
Daughter, age 24
Los-Angeles-County, California · implied b. ~1916 — 5 household members
| Surname | Thompson |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | England |
| 1935 Residence (City) | Santa Monica |
| 1935 Residence (County) | Los Angeles |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 9 |
| 1935 Residence | Same Place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 Thompson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arthur Thompson (~0.92 confidence) and father Angus Thompson (~0.92 confidence) and mother Annie Thompson (~0.92 confidence) and mother Annie Thompson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Arthur Thompson
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Angus Thompson
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Annie Thompson
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Annie Thompson
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Thompson
Daughter · 1940 · age 24 · b. ~1916 · California
★ You are viewing this record
Sibling
John Thompson
Sibling · 1940 · age 35
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 — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00257-00548)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Alice Perkins | 5 | daughter | — | California |
| 2 | Arthur Thompson | 66 | Head | — | England |
| 3 | Annie Thompson | 64 | wife | — | England |
| 4 | John Thompson | 35 | son | Welder | England |
| 5 | Mary Thompson THIS PERSON | 24 | daughter | — | England |
| 6 | John Hall Thompson | 15 | adopted son | — | California |
| 7 | Dorothy Mrs Henrichs | 39 | Head | — | Illinois |
| 8 | Robert M. Henrichs | 15 | son | — | Illinois |
| 9 | Richard D. Henrichs | 13 | son | — | Indiana |
| 10 | Dorothy Henrichs | 11 | daughter | — | Indiana |
| 11 | Davis Henrichs | 9 | son | — | Indiana |
| 12 | Henry W. Silvernail | 54 | Head | Dentist | Wisconsin |
| 13 | Beulah Silvernail | 52 | wife | — | Wisconsin |
| 14 | Kathryn Silvernail | 18 | daughter | — | California |
| 15 | Elsa Mrs Del Valle | 59 | Head | — | Massachusetts |
| 16 | William C. Lynch | 49 | Head | Salesman | Massachusetts |
| 17 | Mary D. Lynch | 44 | wife | — | Illinois |
| 18 | William Lynch | 19 | son | — | California |
| 19 | Alan D. Lynch | 13 | son | — | California |
| 20 | Diana Lynch | 8 | daughter | — | California |
| 21 | Julia Hoffman | 35 | governess | Cook Governess | California |
| 22 | Thomas C. Allum | 70 | Head | — | England |
| 23 | Julia Allum | 60 | wife | — | England |
| 24 | Laura Mrs Dela | 60 | Maid | Maid | Iowa |
| 25 | Fanny Mrs Welcher | 60 | Head | — | New York |
| 26 | Anna F. Mrs Brown | 60 | Maid | Maid | Minnesota |
| 27 | Seth H. Dr. Miles | 50 | Head | — | Massachusetts |
| 28 | Ethelind E. Miles | 50 | wife | — | Pennsylvania |
| 29 | Ruth Jane Miles | 15 | daughter | — | New York |
| 30 | Alma Mrs. Bryant | 52 | cousin | — | West Virginia |
| 31 | Cornelius Cold | 36 | Head | Stock Broker | Hollywood |
| 32 | Marjorie Cold | 31 | wife | — | Massachusetts |
| 33 | Patti V. Cold | 9 | son | — | California |
| 34 | Cornelius Cold | 5 | son | — | California |
| 35 | Louise Dudley | 55 | Mother | — | New Jersey |
| 36 | Edward Mcintyre | 60 | Head | Mining Eng. | Michigan |
| 37 | Helen Mcintyre | 53 | wife | — | Texas |
| 38 | Janith Mcintyre | 22 | daughter | New Worker | California |
| 39 | Louise Willette | 24 | Maid | Maid | California |
| 40 | Wolfgang Reinhardt | 31 | Head | Producer | Germany |
Related Census Records
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 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)