LJ
Leonard Johnson — 1930 US Census Record
Model Tree available1930 United States Federal Census · San Francisco, California
Our Model Tree links this Leonard Johnson across the 1910, 1920 and 1930 US Censuses in San Francisco, California (XGBoost, ~Confirmed), with identified parents Edward & Edward — first a son (b.~1909), then head of a 7-person household.
Age 21
b. ~1909
Male
Son
Born: California
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | San Francisco, California |
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Illinois |
| Mother's Birthplace | California |
| Additional Details | |
| Occupation | Clerk |
| Industry | Drug Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Clerk |
| Township / Ward | San Francisco City |
| Est. Birth Year | ~1909 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Leonard | Age | Birth yr |
|---|---|---|---|---|
| Lula Johnson | Daughter | — | 16 | ~1914 |
| Edith Johnson | Daughter | — | 12 | ~1918 |
| Edward Johnson | Head | — | 57 | ~1873 |
| Mary Johnson | Other | — | 56 | ~1874 |
| Kenneth Johnson | Son | — | 19 | ~1911 |
| Alfred Johnson | Son | — | 22 | ~1908 |
| Leonard Johnson | Son | — | 21 | ~1909 |
Census Appearances
1910
San Francisco, …
Son, age 1
San Francisco, California · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Chicago |
| Mother's Birthplace | California |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1920
San Francisco, …
Son, age 10
San Francisco, California · implied b. ~1910 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Illinois |
| Mother's Birthplace | California |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Son, age 21
San Francisco, California · implied b. ~1909 — 7 household members
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Illinois |
| Mother's Birthplace | California |
| Occupation | Clerk |
| Industry | Drug Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Leonard Johnson across 3 US Census years (1910, 1920 and 1930) in San Francisco, California, using XGBoost record linkage. Identified parents: father Edward Johnson (~0.92 confidence) and father Edward Johnson (~0.92 confidence) and mother Mamie Johnson (~0.92 confidence) and father Edward Johnson (~0.92 confidence) and mother Marie Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Johnson
b. ~1873
Source father
● Household
· direct · ~0.92
Father
Edward Johnson
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Mamie Johnson
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
Edward Johnson
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Marie Johnson
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Leonard Johnson
Son · 1930 · age 21 · b. ~1909 · California
★ You are viewing this record
Sibling
Alfred Johnson
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edith Johnson
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Johnson
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lula Johnson
Sibling · 1930 · age 16
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
1930 US Federal Census — San Francisco, California
Open full size
1930 US Federal Census — San Francisco, California
Page Contents
13 people indexed on this census page (ia:1930:californiacensus00reel198:0751)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Farrell Whelan | 29 | Head | Manager | Minnesota |
| 52 | Marie A Whelan | 27 | Wife-H | — | California |
| 53 | Jack Whelan | 8 | Son | — | California |
| 54 | Robert Whelan | 6 | Son | — | California |
| 55 | Shirley Whelan | 1 | Daughter | — | California |
| 56 | Angela Branco | 35 | — | Servant | British Guinea |
| 57 | Edward Johnson | 57 | Head | Painter | Illinois |
| 58 | Mary Johnson | 56 | Wife-H | — | California |
| 59 | Alfred Johnson | 22 | Son | Upholsterer | California |
| 60 | Leonard Johnson THIS PERSON | 21 | Son | Clerk | California |
| 61 | Kenneth Johnson | 19 | Son | Painter | California |
| 62 | Lula Johnson | 16 | Daughter | — | California |
| 63 | Edith Johnson | 12 | Daughter | — | California |
Related Census Records
Pedigree Summary
Leonard + 4 siblings
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 1930 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)