DR
David Ross — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this David Ross across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Fred & Frederick — first a son (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Ross |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Sierra Madre City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Proprietor |
| Industry | Retail Food Market |
| Class of Worker | OA |
| Hours Worked | 100 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Proprietor |
| Township / Ward | Sierra Madre City |
| Est. Birth Year | ~1913 |
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 David | Age | Birth yr |
|---|---|---|---|---|
| Virginia Ross | Spouse | — | 50 | ~1890 |
| David Ross | Son | — | 27 | ~1913 |
| Alva Moore | Other | — | 82 | ~1858 |
| Frederick Ross | Head | — | 55 | ~1885 |
Census Appearances
1920
Los Angeles, …
Son, age 7
Los Angeles, California · implied b. ~1913 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Roess |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Son, age 17
Los Angeles, California · implied b. ~1913 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ross |
| Given Name | David L. S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Son, age 27
Los-Angeles-County, California · implied b. ~1913 — 4 household members
| Surname | Ross |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Sierra Madre City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Proprietor |
| Industry | Retail Food Market |
| Class of Worker | OA |
| Hours Worked | 100 |
| Income (1939) | 0 |
| 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 David Ross across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Fred Ross (~0.92 confidence) and father Frederick Roess (~0.92 confidence) and father Frederick Ross (~0.92 confidence) and mother Virginia Roess (~0.92 confidence) and mother Virginia Ross (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Ross
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Frederick Roess
b. ~1864
Source father
● Household
· direct · ~0.92
Father
Frederick Ross
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Virginia Roess
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Virginia Ross
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
David Ross
Son · 1940 · age 27 · b. ~1913 · 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-t0627-00237-00941)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Petermann | 31 | Head | Electrician | New York |
| 42 | Helen S. Petermann | 28 | Wife | — | New York |
| 43 | Harold Petermann | 7 | Son | — | California |
| 44 | Donald Petermann | 4 | Son | — | California |
| 45 | Hubert Petermann | 1 | Son | — | California |
| 46 | Theodore K. Rudolph | 35 | Head | — | Germany |
| 47 | Mary G. Rudolph | 36 | Wife | — | Germany |
| 48 | Selma Rudolph | 11 | Daughter | — | California |
| 49 | Arden Rudolph | 9 | Daughter | — | California |
| 50 | Teddy Rudolph | 5 | Son | — | California |
| 51 | Janice Rudolph | 4 | Daughter | — | California |
| 52 | William S. Slade | 70 | Head | — | England |
| 53 | Della F. Brain | 49 | Head | — | Pennsylvania |
| 54 | William J. S. Miller | 66 | Head | — | Canada-English |
| 55 | Catherine A. Miller | 63 | Wife | — | Canada-English |
| 56 | Samuel E. Mcelfresh | 29 | Head | Teacher | Colorado |
| 57 | Thelma L. Mcelfresh | 24 | Wife | Student | California |
| 58 | Frederick C. Ross | 55 | Head | Meat Cutter | Pennsylvania |
| 59 | Virginia L. Ross | 50 | Wife | — | Pennsylvania |
| 60 | David Ross THIS PERSON | 27 | Son | Proprietor | California |
| 61 | Alva B. Moore | 82 | Lodger | — | Nebraska |
| 63 | John C. James | 60 | Head | Salesman | Tennessee |
| 64 | Petra B. James | 60 | Wife | Candy Making | Colorado |
| 65 | Alice Ab. James | 21 | Daughter | Research Work | California |
| 66 | Daisy E. Hawks | 69 | Head | — | Wisconsin |
| 67 | Jane H. Stevenson | 72 | Sister | — | Wisconsin |
| 68 | James N. Hawks | 64 | Head | — | Wisconsin |
| 69 | Ethel H. Hawks | 60 | Wife | — | California |
| 70 | Mary S. Porter | 74 | Head | — | California |
| 71 | Richard A. Waddicor | 28 | Head | Maintenance | Massachusetts |
| 72 | Edna S. Waddicor | 29 | Wife | — | Massachusetts |
| 73 | Minnie L. Vanderslice | 67 | Head | — | Ohio |
| 74 | Zilda Farrell | 62 | Head | — | Sweden |
| 75 | Hazel Farrell | 40 | Daughter | — | Nebraska |
| 76 | Ernest E. Lunsford | 32 | Lodger | — | Tennessee |
| 77 | Ouida Ceder | 30 | Lodger | — | Missouri |
| 78 | Margaret Mcneill | 35 | Lodger | — | California |
| 79 | Arthur E. Peterson | 40 | Head | Plasterer | Sweden |
| 80 | Wilhelmina Peterson | 48 | Wife | — | Michigan |
Pedigree Summary
David
Gen 1 · 5 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)