MC
Mary Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Clark across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents George & Sarah — first a daughter (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Clark |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Stenographer |
| Industry | American Can Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 884 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Stenographer |
| Township / Ward | Los Angeles City |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Clark | Daughter | — | 21 | ~1919 |
| Sarah Clark | Head | — | 55 | ~1885 |
| William Clark | Son | — | 25 | ~1915 |
Census Appearances
1920
Los Angeles, …
Daughter, age 1
Los Angeles, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Mary F |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | Illinois |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Daughter, age 11
Los Angeles, California · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Daughter, age 21
Los-Angeles-County, California · implied b. ~1919 — 3 household members
| Surname | Clark |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Los Angeles City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Stenographer |
| Industry | American Can Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 884 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| 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 Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Clark (~0.92 confidence) and mother Sarah Clark (~0.92 confidence) and mother Sarah Clark (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Clark
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Sarah Clark
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Sarah Clark
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Clark
Daughter · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
William Clark
Sibling · 1940 · age 25
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
39 people indexed on this census page (nara:1940:m-t0627-00423-00278)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen V. Pietsch | 21 | Daughter | — | California |
| 42 | Moises J. Romo | 46 | Head | Manager | Mexico |
| 43 | Maria Romo | 44 | Wife | — | Mexico |
| 44 | Xavier J. Romo | 20 | Son | Grocery Clerk | California |
| 45 | Edward A. Romo | 18 | Son | Salesman | Mexico |
| 46 | Teresa M. Romo | 17 | Daughter | — | Mexico |
| 47 | Harry J. Romo | 14 | Son | — | California |
| 48 | William Romo | 13 | Son | — | California |
| 49 | Gloria Romo | 10 | Daughter | — | California |
| 50 | Frank Schillinger | 26 | Head | Map Clerk | California |
| 51 | Priscilla Schillinger | 21 | Wife | Typist Clerk | Iowa |
| 52 | Alma T. Mott | 50 | Head | Salad Maker | Denmark |
| 53 | Frances Rosecrans | 52 | Lodger | — | New York |
| 55 | Sarah L. Clark | 55 | Head | Office Clerk | Illinois |
| 56 | William A. Clark | 25 | Son | Sheet Metal Worker | California |
| 57 | Mary F. Clark THIS PERSON | 21 | Daughter | Stenographer | California |
| 58 | Van L. Crawford | 44 | Head | Salesman | Georgia |
| 59 | Mary M. Crawford | 56 | Wife | — | Georgia |
| 60 | Edward R. Crawford | 20 | Son | Shirt Cutter | Oklahoma |
| 61 | Donald M. Crawford | 18 | Son | New Worker | California |
| 62 | Ray V. O'Connor | 27 | Head | Farm Hand | Kansas |
| 63 | Ernestine O'Connor | 32 | Wife | Secretary | California |
| 64 | Donald R. O'Connor | 10 | Son | — | California |
| 65 | John J. Mcardle | 25 | Head | Garage Attendant | California |
| 66 | Jeanette M. Mcardle | 30 | Wife | — | New Jersey |
| 67 | Joanne E. Mcardle | 4 | Daughter | — | California |
| 68 | Nancy Lee Mcardle | 2 | Daughter | — | California |
| 69 | George Sniderman | 29 | Head | Office Manager | Pennsylvania |
| 70 | Frieda Sniderman | 25 | Wife | — | California |
| 71 | Myra Susan Sniderman | 0 | Daughter | — | California |
| 72 | Floyd P. Wilcox | 47 | Head | Veterinarian | New York |
| 73 | Gladys B. Wilcox | 49 | Wife | — | New York |
| 74 | Betty Wilcox | 21 | Daughter | — | California |
| 75 | Kenneth R. Wilcox | 16 | Son | Delivery | California |
| 76 | Jeanette R. Wilcox | 8 | Daughter | — | California |
| 77 | Frank J. Bolster | 84 | Head | — | New York |
| 78 | Lester E. Smith | 57 | Head | Salesman | Utah |
| 79 | Hedwig Smith | 52 | Wife | Stenographer | Missouri |
| 80 | Dorothy K. Neidlinger | 25 | Daughter | Bookkeeper | California |
Pedigree Summary
Mary + 1 sibling
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)