RS
Robert Simmons — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Robert Simmons across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents Clarence & Olive — first a son (b.~1914), then head of a 4-person household.
Age 26
b. ~1914
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Simmons |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Santa Monica City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | apprentice |
| Industry | plumbing business |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 406 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Apprentice |
| Township / Ward | Santa Monica City |
| Est. Birth Year | ~1914 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Dolores Simmons | Daughter | — | 11 | ~1929 |
| Clarence Simmons | Head | — | 51 | ~1889 |
| Robert Simmons | Son | — | 26 | ~1914 |
| Olive Simmons | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Los Angeles, …
Son, age 6
Los Angeles, California · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simmons |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Los Angeles, …
Son, age 16
Los Angeles, California · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simmons |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Son, age 26
Los-Angeles-County, California · implied b. ~1914 — 4 household members
| Surname | Simmons |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Santa Monica City |
| 1935 Residence (County) | Los Angeles |
| Occupation | apprentice |
| Industry | plumbing business |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 406 |
| Highest Grade | Hs 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 Robert Simmons across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Clarence Simmons (~0.92 confidence) and mother Olive Simmons (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Clarence Simmons
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Olive Simmons
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Simmons
Son · 1940 · age 26 · b. ~1914 · California
★ You are viewing this record
Sibling
Dolores Simmons
Sibling · 1940 · age 11
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-t0627-00257-00702)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Adelheid Collbohm | 56 | Head | — | Finland |
| 2 | Florence Collbohm | 27 | Daughter | Secretary | Wisconsin |
| 3 | Helmuth W Collbohm | 23 | Son | Engineer | Wisconsin |
| 4 | Henry Niel | 62 | Head | Lawyer | Michigan |
| 5 | Mary V. Niel | 49 | Wife | — | Massachusetts |
| 6 | Clara Worcester | 75 | Head | Manager | Michigan |
| 7 | Edward Jacobs | 65 | Head | — | New York |
| 8 | Cerna Jacobs | 50 | Wife | — | Germany |
| 9 | Clarence Simmons | 51 | Head | Plumber | Colorado |
| 10 | Olive D Simmons | 45 | Wife | — | Illinois |
| 11 | Robert Simmons THIS PERSON | 26 | Son | Apprentice | California |
| 12 | Dolores Simmons | 11 | Daughter | — | California |
| 13 | James Walters | 54 | Head | Carpenter | Nebraska |
| 14 | Bertha Walters | 59 | Wife | — | Missouri |
| 15 | Glenn Walters | 37 | Son | Accountant | Nebraska |
| 16 | Henry Rudberg | 28 | Lodger | Salesman | Massachusetts |
| 17 | Stanley Lewis | 26 | Lodger | Traveling Salesman | Massachusetts |
| 18 | Sarah Miller | 77 | Head | — | Russia |
| 19 | Ann E. Goldring | 44 | Daughter | — | Russia |
| 20 | Max Goldring | 44 | Son-in-law | Owner | Canada |
| 21 | Harriet N Goldring | 19 | Grand-daughter | Cashier | California |
| 22 | Bernard Goldring | 18 | Grand-son | — | California |
| 23 | John M. Leroi | 42 | Head | Salesman | Germany |
| 24 | Marie Leroi | 31 | Wife | — | Germany |
| 25 | Frank Leroi | 1 | Son | — | Palestine |
| 26 | Caesar Campuo | 74 | Head | — | Italy |
| 27 | Bertha Campuo | 61 | Wife | — | Switzerland |
| 28 | Paul Campuo | 23 | Son | Laborer | New York |
| 29 | Bertha Lehman | 71 | Head | — | West Virginia |
| 30 | Pearl Lindsey | 35 | Daughter | Clerical | Pennsylvania |
| 31 | Connie M Lindsey | 13 | Daughter | — | California |
| 32 | James Mcelvain | 29 | Head | Tool Maintenance | Colorado |
| 33 | Mary Mcelvain | 34 | Wife | — | Kentucky |
| 34 | Ethel C. Mcelvain | 60 | Mother | — | Colorado |
| 35 | Mary M. Tobin | 34 | Sister | Comptometer Operator | Colorado |
| 36 | Margaret Mcelvain | 4 | Daughter | — | Colorado |
| 37 | Jay B Spooner | 65 | Head | Purchasing Agent | California |
| 38 | Lina Spooner | 65 | Wife | — | Switzerland |
| 39 | Richard Cox | 20 | grandson | Laborer | California |
| 40 | Rembrandt Spooner | 36 | Head | Contractor | California |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 2 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)