OP
Oscar Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Richland-County, Montana
Our Model Tree links this Oscar Peterson across the 1920, 1930 and 1940 US Censuses in Richland-County, Montana (XGBoost, ~Confirmed), with identified parents Andrew & Andrew — first a son (b.~1918), then head of a 5-person household.
Age 22
b. ~1918
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, Montana |
| Surname | Peterson |
| Given Name | Oscar T |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Richland |
| Additional Details | |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 60 |
| Income (1939) | 888 |
| Highest Grade | Hs 4 |
| 1935 Residence | Montana |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Farm Laborer |
| Township / Ward | School District 24 |
| Est. Birth Year | ~1918 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Ester Peterson | Daughter | — | 15 | ~1925 |
| Andrew Peterson | Head | — | 58 | ~1882 |
| J Peterson | Son | — | 18 | ~1922 |
| Oscar Peterson | Son | — | 22 | ~1918 |
| Olivia Peterson | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Richland, Montana
Son, age 1
Richland, Montana · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Richland, Montana
Son, age 12
Richland, Montana · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| Given Name | Oscar G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Richland-County, Montana
Son, age 22
Richland-County, Montana · implied b. ~1918 — 5 household members
| Surname | Peterson |
| Given Name | Oscar T |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Richland |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 60 |
| Income (1939) | 888 |
| Highest Grade | Hs 4 |
| 1935 Residence | Montana |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 Oscar 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 Petersen (~0.92 confidence) and mother Olivia Petersen (~0.92 confidence). The pedigree spans 1 generation with 4 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 Petersen
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Olivia Petersen
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Peterson
Son · 1940 · age 22 · b. ~1918 · Montana
★ You are viewing this record
Sibling
J Peterson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ester 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 — Richland-County, Montana
Open full size
1940 US Federal Census — Richland-County, Montana
Page Contents
31 people indexed on this census page (nara:1940:m-t0627-02228-00390)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Maurice Eldridge | 23 | Head | Farmer | Colorado |
| 2 | Clara Eldridge | 23 | Wife | — | Montana |
| 3 | Clyde Lewis | 33 | Head | Farmer | Missouri |
| 4 | Zina Lewis | 30 | Wife | — | Missouri |
| 5 | Benjamin Lewis | 0 | Son | — | Montana |
| 6 | Paul Reiss | 59 | Head | Farmer | Wisconsin |
| 7 | Freida Reiss | 61 | Wife | — | Wisconsin |
| 8 | John D Crosby | 63 | Head | Farmer | West Virginia |
| 9 | George Schwerten | 32 | Hired Help | Cook | Pennsylvania |
| 10 | S. N. Norgaard | 63 | Head | Farmer | Minnesota |
| 11 | Thurine Norgaard | 60 | Wife | — | Iowa |
| 12 | Andrew Peterson | 58 | Head | Farmer | Denmark |
| 13 | Olivia Peterson | 53 | Wife | — | Denmark |
| 14 | Oscar T Peterson THIS PERSON | 22 | Son | Farm Laborer | Montana |
| 15 | J. Fredrick Peterson | 18 | Son | — | Montana |
| 16 | Ester M. Peterson | 15 | Daughter | — | Montana |
| 17 | Harry R. Norton | 37 | Head | Farmer | Montana |
| 18 | Leonard Lank | 62 | Head | Farm Laborer | Pennsylvania |
| 19 | Russell Hatter | 20 | Hired Help | Farm Laborer | North Dakota |
| 20 | Fred Kane | 57 | Head | Farmer | Minnesota |
| 21 | Lavey Kane | 56 | Brother | Farmer | Minnesota |
| 22 | Frank B. Norton | 60 | Head | Farmer | Iowa |
| 23 | Anne H. Norton | 48 | Wife | — | Wisconsin |
| 24 | William G. Holt | 80 | Father in Law | — | Virginia |
| 25 | Denis H. Finnicum | 22 | Step Son | Laborer | Montana |
| 26 | David H. Finnicum | 19 | Step Son | — | Montana |
| 27 | Carl J. Johnson | 48 | Head | Farm Laborer | Minnesota |
| 28 | Mary J. Johnson | 45 | Wife | — | Minnesota |
| 29 | Chalmers Fitzgerald | 56 | Head | Farmer | Ohio |
| 30 | Steven Goodson | 16 | Hired Helper | Farm Help | Montana |
| 31 | Henry Elm | 65 | Head | Farmer | Germany |
Pedigree Summary
Oscar + 2 siblings
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)