RP
Robert Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marin-County, California
Our Model Tree links this Robert Peterson across the 1920, 1930 and 1940 US Censuses in Marin-County, California (XGBoost, ~Confirmed), with identified parents Andrew & Andrew — first a son (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marin-County, California |
| Surname | Peterson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Rafael city |
| Additional Details | |
| Occupation | plaster |
| Industry | building construction |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 900 |
| Highest Grade | H 2 |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | Plaster |
| Township / Ward | San Rafael 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Mae Peterson | Daughter | — | 19 | ~1921 |
| Betty Peterson | Daughter | — | 15 | ~1925 |
| Andrew Peterson | Head | — | 58 | ~1882 |
| Robert Peterson | Son | — | 21 | ~1919 |
| James Peterson | Son | — | 17 | ~1923 |
| Georgetta Peterson | Spouse | — | 41 | ~1899 |
Census Appearances
1920
Marin, California
Son, age 1
Marin, California · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | California |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Marin, California
Son, age 11
Marin, California · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Sweden |
| Mother's Birthplace | California |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Marin-County, California
Son, age 21
Marin-County, California · implied b. ~1919 — 6 household members
| Surname | Peterson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Rafael city |
| Occupation | plaster |
| Industry | building construction |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 900 |
| Highest Grade | H 2 |
| 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 Robert Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Andrew Peterson (~0.92 confidence) and father Andrew Peterson (~0.92 confidence) and father Andrew Peterson (~0.92 confidence) and mother Georgette Peterson (~0.92 confidence) and mother Georgetta Peterson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Andrew Peterson
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Andrew Peterson
b. ~1882
Source father
● Household
· direct · ~0.92
Father
Andrew Peterson
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Georgette Peterson
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Georgetta Peterson
b. ~1899
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Peterson
Son · 1940 · age 21 · b. ~1919 · California
★ You are viewing this record
Sibling
James Peterson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mae Peterson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Peterson
Sibling · 1940 · age 15
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 — Marin-County, California
Open full size
1940 US Federal Census — Marin-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00261-00596)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marjorie M Berryhill | 26 | Wife | — | California |
| 42 | Betty Jeanne Berryhill | 6 | Daughter | — | California |
| 43 | Robert Carlton Berryhill | 2 | Son | — | California |
| 44 | Omar Mcnally | 42 | Head | District Represent | Maine |
| 45 | Regina Mcnally | 39 | Wife | — | California |
| 46 | Omar Jr. Mcnally | 13 | Son | — | California |
| 47 | Rafael Mcnally | 9 | Son | — | California |
| 48 | Mitzi J. Mcnally | 3 | Daughter | — | California |
| 49 | Lowell H. Junino | 22 | Head | Janitor | California |
| 50 | Elaine A. Junino | 24 | Wife | — | California |
| 51 | Paul Mary | 47 | Head | Proprietor | Switzerland |
| 52 | Onorina Mary | 48 | Wife | Saleslady | Italy |
| 53 | Dora Mary | 18 | Daughter | — | California |
| 54 | Warren Lewis | 71 | Head | — | California |
| 55 | Ida Lewis | 67 | Wife | Seamstress | California |
| 56 | Clifton Kleeman | 51 | Son | — | California |
| 57 | Oscar Kleeman | 30 | Lodger | Salesman | Indiana |
| 58 | Walter C. Cornwell | 37 | Head | Surveyor | Illinois |
| 59 | Mabel Cornwell | 32 | Wife | Bookkeeper | California |
| 60 | John J. Mountain | 36 | Head | Proprietor | Montana |
| 61 | Georgia Mountain | 40 | Wife | — | California |
| 62 | Manuel Fagundas | 68 | Head | — | Azores Island |
| 63 | Rose H. Fagundas | 35 | Daughter | Primary Teacher | California |
| 64 | Richards Smith | 32 | Head | Mechanic | Missouri |
| 65 | Cornelia Smith | 27 | Wife | — | California |
| 66 | William Smith | 4 | Son | — | California |
| 67 | Charles P. Smith | 57 | Father | Stationary Guard | Missouri |
| 68 | Sarah E. Smith | 57 | Mother | Housekeeper | Missouri |
| 69 | Charles Parra | 57 | Head | Cement Worker | Switzerland |
| 70 | Mary Parra | 49 | Wife | — | California |
| 71 | Andrew Peterson | 58 | Head | Carpenter | Sweden |
| 72 | Georgetta Peterson | 41 | Wife | — | California |
| 73 | Robert Peterson THIS PERSON | 21 | Son | Plaster | California |
| 74 | Mae Peterson | 19 | Daughter | New Worker | California |
| 75 | James Peterson | 17 | Son | Carpenter | California |
| 76 | Betty Peterson | 15 | Daughter | — | California |
| 77 | Charles Unrath | 54 | Head | Proprietor | California |
| 78 | Hilda C. Unrath | 45 | Wife | — | California |
| 79 | Sophie L. Palmer | 69 | Head | — | California |
| 80 | Kathryn M. Palmer | 42 | Daughter | Principal Teacher | California |
Pedigree Summary
Robert + 3 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 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)