RJ
Ronald Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Ronald Johnson across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Johnson |
| Given Name | Ronald M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | SAN MARINO CITY |
| 1935 Residence (County) | LOS ANGELES |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Marino City |
| Est. Birth Year | ~1918 |
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 Ronald | Age | Birth yr |
|---|---|---|---|---|
| Ella Johnson | Spouse | — | 49 | ~1891 |
| Carl Johnson | Head | — | 51 | ~1889 |
| Ronald Johnson | Son | — | 22 | ~1918 |
Census Appearances
1930
Los Angeles, …
Son, age 11
Los Angeles, California · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ronald C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | England |
| Mother's Birthplace | Canada English |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Son, age 22
Los-Angeles-County, California · implied b. ~1918 — 3 household members
| Surname | Johnson |
| Given Name | Ronald M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | SAN MARINO CITY |
| 1935 Residence (County) | LOS ANGELES |
| Highest Grade | C 1 |
| 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 Ronald Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Ronald Johnson
Son · 1940 · age 22 · b. ~1918 · California
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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
37 people indexed on this census page (nara:1940:m-t0627-00254-00008)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 3 | Morris P Kirk | 8 | Son | — | California |
| 4 | Trowbridge W Kirk | 4 | Son | — | California |
| 5 | Emma Wisdom | 23 | Servant | Servant | Oklahoma |
| 6 | Georgia Smith | 32 | Servant | Cook | South Carolina |
| 7 | Carl E Johnson | 51 | Head | Proprietor | Illinois |
| 8 | Ella M Johnson | 49 | Wife | — | Ohio |
| 9 | Ronald M Johnson THIS PERSON | 22 | Son | — | California |
| 11 | Armin Thurmher | 47 | Head | Park Superintendent | Austria |
| 12 | Erna Thurmher | 37 | Wife | — | Austria |
| 13 | E William Thurmher | 15 | Son | — | California |
| 14 | Oskar R Thurmher | 11 | Son | — | California |
| 15 | Bertram E Thurmher | 6 | Son | — | California |
| 16 | Laurence Bogine | 48 | Head | Investment Manager | Minnesota |
| 17 | Gretchen Bogine | 50 | Wife | — | Maryland |
| 18 | Patricia Bogine | 12 | Daughter | — | California |
| 19 | Gretchen Bogine | 10 | Daughter | — | California |
| 20 | William L Schmitz | 41 | Head | Dentist | California |
| 21 | Madeline Schmitz | 38 | Wife | — | Montana |
| 22 | Adelle Schmitz | 14 | Daughter | — | California |
| 23 | John Schmitz | 12 | Son | — | California |
| 24 | William Schmitz | 7 | Son | — | California |
| 25 | Frank E Jr Brooks | 25 | Son-in-law | Manager | California |
| 26 | Frank E Sr Brooks | 48 | Head | Manager | California |
| 27 | Minnie H Brooks | 48 | Wife | — | Illinois |
| 28 | Betty Lou Brooks | 17 | Daughter | — | California |
| 29 | Frank Jr Brooks | 15 | Son | — | California |
| 30 | Beverly Brooks | 14 | Daughter | — | California |
| 31 | Mary Toyama | 23 | Servant | Housekeeper | Arizona |
| 32 | Leslie Thurnbach | 45 | Head | Sales Representative | California |
| 33 | Helen Thurnbach | 42 | Wife | — | Missouri |
| 34 | Carol Thurnbach | 15 | Daughter | — | California |
| 35 | Katharine Thurnbach | 9 | Daughter | — | California |
| 36 | Ana Douglas | 47 | Servant | Housekeeper | Kansas |
| 37 | Lyman Robertson | 41 | Head | Attorney | Florida |
| 38 | Mercedes Robertson | 31 | Wife | — | California |
| 39 | Sharon M Robertson | 4 | Daughter | — | California |
| 40 | Ross T Robertson | 2 | Son | — | California |
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)