RJ
Ruth Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Ruth Johnson across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents August & Rudolph — first a daughter (b.~1903), then head of a 4-person household.
Age 37
b. ~1903
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Johnson |
| Given Name | Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1960 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Stenographer |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1903 |
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 Ruth | Age | Birth yr |
|---|---|---|---|---|
| Ruth Johnson | Daughter | — | 37 | ~1903 |
| Rudolph Johnson | Head | — | 71 | ~1869 |
| Berger Johnson | Son | — | 27 | ~1913 |
| Nellie Johnson | Spouse | — | 60 | ~1880 |
Census Appearances
1920
San Francisco, …
Daughter, age 16
San Francisco, California · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Norway |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Daughter, age 27
San Francisco, California · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Stenographer |
| Industry | Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Daughter, age 37
San-Francisco-County, California · implied b. ~1903 — 4 household members
| Surname | Johnson |
| Given Name | Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | Stenographer |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1960 |
| Highest Grade | Hs 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 Ruth Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father August Johnson (~0.92 confidence) and father Rudolph Johnson (~0.92 confidence) and mother Olive Johnson (~0.92 confidence) and mother Lillie Johnson (~0.92 confidence) and mother Nellie Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
August Johnson
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Rudolph Johnson
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Olive Johnson
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Lillie Johnson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Nellie Johnson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ruth Johnson
Daughter · 1940 · age 37 · b. ~1903 · California
★ You are viewing this record
Sibling
Berger Johnson
Sibling · 1940 · age 27
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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00311-00377)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rudolph Johnson | 71 | Head | Third Officer | Norway |
| 2 | Nellie Johnson | 60 | Wife | — | Norway |
| 3 | Ruth Johnson THIS PERSON | 37 | Daughter | Stenographer | California |
| 4 | Berger Johnson | 27 | Son | Clerk | California |
| 5 | Gertrude Malloy | 52 | Head | — | Nebraska |
| 6 | Lou Malloy | 32 | Son | Architect | California |
| 7 | Thomas S Mallory | 70 | Head | Attorney | California |
| 8 | Alice M Laird | 42 | Daughter | — | California |
| 9 | Kathryn Laird | 14 | Granddaughter | — | California |
| 10 | Frank Cataldo | 24 | Head | Janitor | Rhode Island |
| 11 | Ruth Cataldo | 19 | Wife | — | Washington |
| 12 | Charles Kilgore | 40 | Head | Radio Engineer | Washington |
| 13 | Juanita Kilgore | 40 | Wife | Cashier | Washington |
| 14 | John Thrall | 32 | Head | Commercial Artist | Oregon |
| 15 | Agnes R Thrall | 59 | Partner | Music Teacher | Wisconsin |
| 16 | Elias Randa | 57 | Head | Longshoreman | Finland |
| 17 | Mary Randa | 50 | Wife | Maid | Finland |
| 18 | Aila Randa | 22 | Daughter | — | California |
| 19 | Herman Owen | 69 | Head | Teacher | Ohio |
| 20 | Elizabeth Owen | 65 | Wife | Teacher | Philadelphia |
| 21 | Oswald Whitford | 41 | Head | Minister | England |
| 22 | Effie Whitford | 38 | Wife | — | Canada-English |
| 23 | Sylvia Whitford | 11 | Daughter | — | Canada-English |
| 24 | Carolyn Whitford | 7 | Daughter | — | California |
| 25 | Julius Quetnick | 45 | Head | Proprietor | U.S.S.R. |
| 26 | Michael Piscitelli | 64 | Head | Proprietor | Italy |
| 27 | Raephal Piscitelli | 63 | Wife | — | Italy |
| 28 | Angelina Piscitelli | 35 | Daughter | Medical Doctor | Pennsylvania |
| 29 | Mary Peace | 32 | Boarder | Saleswoman | Washington |
| 30 | Edward Hartman | 54 | Head | Electrician | Missouri |
| 31 | Christie Hartman | 47 | Wife | — | California |
| 32 | Doris Hartman | 22 | Daughter | Receptionist | California |
| 33 | Ray Hartman | 20 | Son | File Clerk | California |
| 34 | Barbara Hartman | 10 | Daughter | — | California |
| 35 | Oscar Rudnick | 59 | Head | Proprietor | Germany |
| 36 | Martha Rudnick | 53 | Wife | — | Illinois |
| 37 | Percy Dawson | 46 | Head | Salesman | Massachusetts |
| 38 | Winifred Dawson | 33 | Wife | Mailing Clerk | Wales |
Pedigree Summary
Ruth + 1 sibling
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)