LJ
Leonard Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Leonard Johnson across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Peter — first a head (b.~1910), then head of a 3-person household.
Age 30
b. ~1910
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | SAN FRANCISCO |
| 1935 Residence (County) | SAN FRANCISCO |
| Additional Details | |
| Occupation | Manager |
| Industry | Retail Grocer |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 2050 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Manager |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1910 |
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 Leonard | Age | Birth yr |
|---|---|---|---|---|
| Leonard Johnson | Head | — | 30 | ~1910 |
| Melvyn Johnson | Son | — | 5 | ~1935 |
| Sophie Johnson | Spouse | — | 30 | ~1910 |
Census Appearances
1920
San Francisco, …
Son, age 9
San Francisco, California · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leonard R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Son, age 20
San Francisco, California · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Shipping Clerk |
| Industry | Hatter Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Head, age 30
San-Francisco-County, California · implied b. ~1910 — 3 household members
| Surname | Johnson |
| Given Name | Leonard |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | SAN FRANCISCO |
| 1935 Residence (County) | SAN FRANCISCO |
| Occupation | Manager |
| Industry | Retail Grocer |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 2050 |
| Highest Grade | Hs 3 |
| 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 Leonard Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Johnson (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Johnson
b. ~1872
Source father
● Household
· direct · ~0.92
This person
Anchor record
Leonard Johnson
Head · 1940 · age 30 · b. ~1910 · 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-t0627-00309-00541)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Richard O'Regan | 15 | Son | — | California |
| 42 | Timothy O'Regan | 14 | Son | — | California |
| 43 | Joseph O'Regan | 10 | Son | — | California |
| 44 | Chris Hill | 40 | Head | Plasterer | Norway |
| 45 | Julia Hill | 48 | Wife | — | Norway |
| 46 | Christen Hill | 18 | Daughter | — | Norway |
| 47 | Carl Hill | 16 | Son | Messenger | California |
| 48 | Palmer Boyd | 47 | Head | Maintenance Machinist | Alabama |
| 49 | Nellie Boyd | 38 | Wife | — | Texas |
| 50 | Catherine Boyd | 17 | Daughter | — | Louisiana |
| 51 | Elizabeth Boyd | 15 | Daughter | — | Louisiana |
| 52 | Boyd Jr. Boyd | 11 | Son | — | California |
| 53 | Walter Mclaughlin | 31 | Head | Teamster | Texas |
| 54 | Constance Mclaughlin | 26 | Wife | — | California |
| 55 | Donald Mclaughlin | 3 | Son | — | California |
| 56 | Leonard Johnson THIS PERSON | 30 | Head | Manager | California |
| 57 | Sophie Johnson | 30 | Wife | — | California |
| 58 | Melvyn Johnson | 5 | Son | — | California |
| 59 | Joseph Tracy | 48 | Head | Proprietor | California |
| 60 | Catherine Tracy | 44 | Wife | — | California |
| 61 | Claire Tracy | 11 | Daughter | — | California |
| 62 | Julia Lorden | 38 | Sister-in-law | Accountant | California |
| 63 | Charles Bischoff | 60 | Head | — | California |
| 64 | Mabel Bischoff | 47 | Wife | — | California |
| 65 | Geraldine Bischoff | 16 | Daughter | — | California |
| 66 | Mary Bischoff | 14 | Daughter | — | California |
| 67 | Charles Bischoff | 12 | Son | — | California |
| 68 | John Clark | 40 | Head | Chauffeur | California |
| 69 | Ruby Clark | 45 | Wife | — | California |
| 70 | Albert Schnieder | 50 | Head | — | California |
| 71 | Louise Schnieder | 43 | Wife | — | California |
| 72 | Thelma Schnieder | 19 | Daughter | — | California |
| 73 | Elmer Schnieder | 17 | Son | — | California |
| 74 | Kenneth Schnieder | 14 | Son | — | California |
| 75 | Mary Lou Schnieder | 7 | Daughter | — | California |
| 76 | Andrew Rasmussen | 30 | Head | Painter | California |
| 77 | Mallinnie Rasmussen | 26 | Wife | — | California |
| 78 | Andrew Rasmussen | 6 | Son | — | California |
| 79 | Melvin Rasmussen | 2 | Son | — | California |
| 80 | John Studva | 19 | Head | Warehouseman | California |
Pedigree Summary
Leonard
Gen 1 · 1 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)