EN
Elmer Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Contra-Costa-County, California
Our Model Tree links this Elmer Nelson across the 1920, 1930 and 1940 US Censuses in Contra-Costa-County, California (XGBoost, ~Confirmed), with identified parents John & John — first a head (b.~1904), then head of a 4-person household.
Age 36
b. ~1904
Male
Head
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Contra-Costa-County, California |
| Surname | Nelson |
| Given Name | Elmer |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | El Cerrito |
| 1935 Residence (County) | Contra Costa |
| Additional Details | |
| Occupation | electrician |
| Industry | oil refinery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Electrician |
| Township / Ward | El Cerrito |
| Est. Birth Year | ~1904 |
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 Elmer | Age | Birth yr |
|---|---|---|---|---|
| Ella Nelson | Spouse | — | 25 | ~1915 |
| John Nelson | Son | — | 6 | ~1934 |
| Elmer Nelson | Head | — | 36 | ~1904 |
| Matilda Eisenberg | Other | — | 69 | ~1871 |
Census Appearances
1920
Alameda, California
Son, age 16
Alameda, California · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Elmer |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Alameda, California
Son, age 26
Alameda, California · implied b. ~1904 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Elmer |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Finland |
| Occupation | electrician |
| Industry | Standard Oil |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Contra-Costa-County, California
Head, age 36
Contra-Costa-County, California · implied b. ~1904 — 4 household members
| Surname | Nelson |
| Given Name | Elmer |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | El Cerrito |
| 1935 Residence (County) | Contra Costa |
| Occupation | electrician |
| Industry | oil refinery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1800 |
| Highest Grade | H 2 |
| 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 Elmer Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Nelson (~0.92 confidence) and father John Nelson (~0.92 confidence) and mother Mary Nelson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Nelson
b. ~1879
Source father
● Household
· direct · ~0.92
Father
John Nelson
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Mary Nelson
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Elmer Nelson
Head · 1940 · age 36 · b. ~1904 · 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 — Contra-Costa-County, California
Open full size
1940 US Federal Census — Contra-Costa-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00196-00447)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Greene | 24 | daughter | Teacher | California |
| 2 | Joseph Maritz | 53 | head | Salesman | Michigan |
| 3 | Frances Maritz | 49 | wife | Secretary | Illinois |
| 4 | John Maritz | 19 | son | Truck Driver | Indiana |
| 5 | Neville Eddlestone | 33 | head | Train Master | England |
| 6 | Lorene Eddlestone | 32 | wife | — | California |
| 7 | Patricia Eddlestone | 2 | daughter | — | California |
| 8 | Margaret Basse | 55 | mother-in-law | Practical Nurse | California |
| 9 | Stuart Jones | 25 | head | Clerk | California |
| 10 | Catherine Jones | 24 | wife | — | Illinois |
| 11 | Catherine Jones | 1 | daughter | — | California |
| 12 | Merle J. Mcconnell | 36 | head | Engineer | Idaho |
| 13 | Edna Mcconnell | 37 | wife | Inspector | Maine |
| 14 | Wanda Mcconnell | 17 | daughter | — | California |
| 15 | Clifford Jacobson | 24 | head | Carpenter | California |
| 16 | Jean Jacobson | 22 | wife | — | California |
| 17 | Nancy Jacobson | 1 | daughter | — | California |
| 18 | Henry Goldenberg | 49 | head | Theater Manager | Wisconsin |
| 19 | Naomi Goldenberg | 39 | wife | — | Texas |
| 20 | Alfred Goldenberg | 3 | son | — | California |
| 21 | Elvira Stevens | 18 | maid | Maid | Utah |
| 22 | Elmer Nelson THIS PERSON | 36 | head | Electrician | California |
| 23 | Ella Nelson | 25 | wife | — | California |
| 24 | John Nelson | 6 | son | — | California |
| 25 | Matilda Eisenberg | 69 | mother-in-law | — | Germany |
| 26 | Cora Corbett | 60 | head | — | Massachusetts |
| 27 | Desmond O'Leary | 25 | head | Electrician | California |
| 28 | Mabel O'Leary | 23 | wife | — | California |
| 29 | Erin Colleen O'Leary | 5 | daughter | — | California |
| 30 | Peter Vatals | 32 | head | Manager | California |
| 31 | Beverly Vatals | 30 | wife | — | Illinois |
| 32 | Tommy Vatals | 3 | son | — | California |
| 33 | Vernon Cavanaugh | 31 | head | Auditor | California |
| 34 | Eunice Cavanaugh | 35 | wife | — | Massachusetts |
| 35 | William Watkins | 70 | head | Teamster | Missouri |
| 36 | Mary Ann Watkins | 71 | wife | — | Illinois |
| 37 | John De Vaughn | 45 | head | Painter | Louisiana |
| 38 | Annie De Vaughn | 32 | wife | — | Louisiana |
| 39 | Virginia De Vaughn | 13 | daughter | — | Texas |
| 40 | John De Vaughn | 11 | son | — | Missouri |
Pedigree Summary
Elmer
Gen 1 · 3 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)