DJ
Donald Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Donald Johnson across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents Fred & Fred — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Johnson |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland city |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 5 |
| Highest Grade | H 2 |
| 1935 Residence | Same House |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Oakland City |
| Est. Birth Year | ~1919 |
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 Donald | Age | Birth yr |
|---|---|---|---|---|
| Margaret Johnson | Daughter | — | 19 | ~1921 |
| Fred Johnson | Head | — | 47 | ~1893 |
| Donald Johnson | Son | — | 21 | ~1919 |
| Ethel Johnson | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Alameda, California
Other, age 1
Alameda, California · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Donald |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Alameda, California
Son, age 11
Alameda, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Donald W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Son, age 21
Alameda-County, California · implied b. ~1919 — 4 household members
| Surname | Johnson |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland city |
| 1935 Residence (County) | Alameda |
| Class of Worker | 0 |
| Hours Worked | 5 |
| Highest Grade | H 2 |
| 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 Donald Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Fred Johnson (~0.92 confidence) and father Fred Johnson (~0.92 confidence) and mother Ethel Johnson (~0.92 confidence) and mother Ethel Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Johnson
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Fred Johnson
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Ethel Johnson
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Ethel Johnson
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Donald Johnson
Son · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
Margaret Johnson
Sibling · 1940 · age 19
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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00433-00577)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ross Dearborn | 27 | Head | Clerk | California |
| 2 | Antoinette Dearborn | 25 | Wife | — | California |
| 3 | Henry Albera | 44 | Head | — | California |
| 4 | Maud Albera | 47 | Wife | — | California |
| 5 | Frank Moniz | 46 | Head | Radiator Man | Hawaii |
| 6 | Theodora Moniz | 34 | Wife | — | California |
| 7 | Marlene Moniz | 4 | Daughter | — | California |
| 8 | Charles Julio | 44 | Head | — | Italy |
| 9 | Colomba Julio | 42 | Wife | — | Italy |
| 10 | Dominic Julio | 24 | Son | New Worker | Oregon |
| 11 | Irene Julio | 17 | Daughter | — | Idaho |
| 12 | Margaret Julio | 15 | Daughter | — | Nevada |
| 13 | Ida Frates | 23 | Daughter | — | Oregon |
| 14 | Darlene Frates | 3 | Granddaughter | — | California |
| 15 | Marlene Frates | 3 | Granddaughter | — | California |
| 16 | Mary Ferreira | 19 | Daughter | — | Idaho |
| 17 | Doris Ferreira | 1 | Granddaughter | — | California |
| 18 | Alan Trites | 24 | Head | Bookkeeper | California |
| 19 | Shirley Trites | 19 | Wife | — | California |
| 20 | James Trites | 2 | Son | — | California |
| 21 | Fred Johnson | 47 | Head | Switchboard Wireman | California |
| 22 | Ethel Johnson | 42 | Wife | — | California |
| 23 | Donald Johnson THIS PERSON | 21 | Son | — | California |
| 24 | Margaret Johnson | 19 | Daughter | Secretary | California |
| 25 | Victor Candia | 25 | Head | Car Cleaner | California |
| 26 | Doris Candia | 20 | Wife | — | California |
| 27 | Everett Williams | 25 | Head | Packer | Kansas |
| 28 | Elsie Williams | 26 | Wife | Elevator Operator | Kansas |
| 29 | Ole Sater | 36 | Head | Gasoline Dealer | Norway |
| 30 | Alma Sater | 32 | Wife | Housekeeper | Wisconsin |
| 31 | Blister Glenn | 35 | Head | Plant Manager | Washington |
| 32 | Mary Glenn | 46 | Wife | — | California |
| 33 | Crawford Glenn | None | Amelia | 40 | H 4 |
| 34 | Emile Didier | 37 | Head | Operator | California |
| 35 | Aubrey Didier | 37 | Wife | — | California |
| 36 | Harry W. Littell | 39 | Head | Salesman | California |
| 37 | Viola Littell | 35 | Wife | Secretary | California |
| 38 | Widmer Curtis | 51 | Head | Scale Inspector | Illinois |
Pedigree Summary
Donald + 1 sibling
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)