HJ
Helen Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Helen Johnston across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Arvid & Arvid — first a daughter (b.~1920), then head of a 3-person household.
Age 20
b. ~1920
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 960 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Stenographer |
| Township / Ward | San Francisco |
| 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 Helen | Age | Birth yr |
|---|---|---|---|---|
| Helen Johnston | Daughter | — | 20 | ~1920 |
| Jennie Johnston | Spouse | — | 55 | ~1885 |
| Arvid Johnston | Head | — | 60 | ~1880 |
Census Appearances
1920
San Francisco, …
Daughter, age
San Francisco, California · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Mother Tongue | Swedish |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Daughter, age 10
San Francisco, California · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Daughter, age 20
San-Francisco-County, California · implied b. ~1920 — 3 household members
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Stenographer |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 960 |
| Highest Grade | H-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 Helen Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arvid Johnston (~0.92 confidence) and father Arvid Johnston (~0.92 confidence) and father David Johnston (~0.92 confidence) and mother Amy Johnston (~0.92 confidence) and mother Jennie Johnston (~0.92 confidence) and mother Jennie Johnston (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Arvid Johnston
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Arvid Johnston
b. ~1880
Source father
● Household
· direct · ~0.92
Father
David Johnston
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Amy Johnston
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Jennie Johnston
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Jennie Johnston
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Helen Johnston
Daughter · 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
40 people indexed on this census page (nara:1940:m-t0627-00311-00395)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lois Cullen | 19 | Daughter | — | California |
| 2 | Nellie Millingham | 19 | Foster daughter | — | California |
| 3 | Marie Millingham | 17 | Foster daughter | — | California |
| 4 | Arvid Johnston | 60 | Head | Farmer | Sweden |
| 5 | Jennie Johnston | 55 | Wife | — | Sweden |
| 6 | Helen Johnston THIS PERSON | 20 | Daughter | Stenographer | California |
| 7 | Frank V. Castello | 40 | Head | Sign Painter | Texas |
| 8 | Anita Castello | 38 | Wife | — | Colorado |
| 9 | Clarice Castello | 19 | Daughter | — | California |
| 10 | Lorraine Castello | 14 | Daughter | — | California |
| 11 | Frank Jr. Castello | 9 | Son | — | California |
| 12 | Carleton Cook | 52 | Head | Wagon Driver | Vermont |
| 13 | Josephine Cook | 51 | Wife | — | California |
| 14 | Kenneth Cook | 26 | Son | Washer | California |
| 15 | Ruth R. Cook | 22 | Daughter | Receptionist | California |
| 16 | Waldo J. Thasse | 26 | Head | Watchman | California |
| 17 | Evelyn I. Thasse | 20 | Wife | — | Montana |
| 18 | Betty Ruth Thasse | 1 | Daughter | 0 | California |
| 19 | Ivey Hobson | 19 | Head | Children'S Nurse | California |
| 20 | Donald Hobson | 3 | Son | — | California |
| 21 | Selma Pinkerton | 38 | Head | Warehouseman | California |
| 22 | Caroline Pinkerton | 71 | Mother | — | Nebraska |
| 23 | Christina P. O'Donnell | 76 | Boarder | — | California |
| 24 | Miss Mary Ross | 77 | Boarder | — | California |
| 25 | Mrs. Anna Bauer | 52 | Boarder | Practical Nurse And Masseur | Germany |
| 26 | Theresa Morten | 65 | Head | — | California |
| 27 | Francis I. Morten | 33 | Son | Clerical | California |
| 28 | Harry B. Loole | 32 | Head | Mechanic | Utah |
| 29 | Faye B. Loole | 30 | Wife | — | Kansas |
| 30 | Susan Loole | 2 | Daughter | 0 | California |
| 31 | Owen Mccabe | 65 | Head | Salesman | Iowa |
| 32 | Nelle Mccabe | 55 | Wife | — | California |
| 33 | Sara Marconi | 67 | Head | — | Massachusetts |
| 34 | Albina Marconi | 57 | Sister | Cosmetician | Massachusetts |
| 35 | Emma G. Marconi | 45 | Sister | Cosmetician | Massachusetts |
| 36 | Ernest Le Blanc | 73 | Head | Janitor | Canada French |
| 37 | Rosanna Le Blanc | 64 | Wife | — | Rhode Island |
| 38 | Mrs. Anna Stilling | 71 | Head | — | Germany |
| 39 | Fred Stilling | 45 | Son | Laborer | California |
| 40 | Edward W. Driscoll | 51 | Head | Fireman | Irish Free State |
Pedigree Summary
Helen
Gen 1 · 6 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)