RJ
Robert Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Robert Johnston across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents John & Mary — first a son (b.~1920), then head of a 3-person household.
Age 20
b. ~1920
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | SAN FRANCISCO |
| Additional Details | |
| Occupation | Mechanic |
| Industry | Machine Shop |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Mechanic |
| Est. Birth Year | ~1920 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Edward Johnston | Head | — | 48 | ~1892 |
| Robert Johnston | Son | — | 20 | ~1920 |
| Agnes Johnston | Spouse | — | 48 | ~1892 |
Census Appearances
1920
San Francisco, …
Son, age
San Francisco, California · implied b. ~1920 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Son, age 10
San Francisco, California · implied b. ~1920
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Johnston |
| Given Name | Robert J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| Age at First Marriage | 10 |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Son, age 20
San-Francisco-County, California · implied b. ~1920 — 3 household members
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | SAN FRANCISCO |
| Occupation | Mechanic |
| Industry | Machine Shop |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| 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 Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Johnston (~0.92 confidence) and mother Mary Johnston (~0.92 confidence) and mother Agnes Johnston (~0.92 confidence) and father Edward Johnston (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Johnston
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Mary Johnston
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Agnes Johnston
b. ~1892
Source mother
● Household
· direct · ~0.92
Father
Edward Johnston
b. ~1892
Source father
● Household
· direct · ~0.92
This person
Anchor record
Robert Johnston
Son · 1940 · age 20 · b. ~1920 · 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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00316-00310)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Knight | 51 | Wife | At Home | Scotland |
| 42 | Jacob Wetzel | 41 | Head | Laborer | Germany |
| 43 | Meta Wetzel | 37 | Wife | Maid | Germany |
| 44 | Edward Johnston | 48 | Head | Fireman | California |
| 45 | Agnes Johnston | 48 | Wife | At Home | England |
| 46 | Robert Johnston THIS PERSON | 20 | Son | Mechanic | California |
| 48 | Gustave Niederholter | 65 | Head | — | Austria |
| 49 | John Carr | 33 | Head | Safety Engineer | California |
| 50 | Mary Carr | 33 | Wife | At Home | California |
| 51 | Sally Carr | 7 | Daughter | — | California |
| 52 | Helen Conway | 57 | Head | At Home | Germany |
| 53 | Helen Conway | 32 | Daughter | Laborer | California |
| 54 | Paul Speetzen | 53 | Brother | Laborer | Germany |
| 55 | Howell Spooner | 62 | Head | Conductor | New Jersey |
| 56 | Marie Spooner | 60 | Wife | At Home | French Canada |
| 57 | Ben Troutman | 27 | Head | Machine Oper | North Dakota |
| 58 | Hazel Troutman | 23 | Wife | At Home | Washington |
| 59 | Dave Soval | 29 | Head | Clerk | California |
| 60 | Sara Soval | 27 | Wife | At Home | California |
| 61 | Josephine Johannesen | 58 | Head | At Home | Norway |
| 62 | Alice Johannesen | 24 | Daughter | Part Time Clerk | California |
| 63 | Isabel Johannesen | 14 | Daughter | — | California |
| 65 | Albert Medau | 67 | Head | Coffee Roaster | California |
| 66 | Matilda Medau | 57 | Wife | At Home | California |
| 67 | Samuel La Beau | 65 | Head | Laborer | Michigan |
| 68 | Anne La Beau | 65 | Wife | At Home | New York |
| 69 | Anlone Bustillos | 29 | Head | Laborer | Mexico |
| 70 | Marie Bustillos | 27 | Sister | Laborer | Mexico |
| 71 | Ramona Bustillos | 13 | Niece | — | California |
| 72 | Louis Bustillos | 10 | Nephew | — | California |
| 73 | Juana Bustillos | 67 | Mother | At Home | Mexico |
| 74 | Anna Terzian | 37 | Head | At Home | Turkey |
| 75 | Joseph Terzian | 15 | Son | — | California |
| 76 | Haig Terzian | 12 | Son | — | California |
| 77 | Victoria Terzian | 10 | Daughter | — | California |
| 78 | Leo Terzian | 3 | Son | — | California |
| 80 | James Manning | 33 | Head | Clerk | California |
Pedigree Summary
Robert
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)