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Oscar Olson — 1920 US Census Record
Model Tree available1920 United States Federal Census · Mountrail, North Dakota
Our Model Tree links this Oscar Olson across the 1920, 1930 and 1940 US Censuses in Mountrail, North Dakota (XGBoost, ~Confirmed), with identified parents Olaf & Helena — first a son (b.~1918), then head of a 7-person household.
Age 2
b. ~1918
Male
Son
Born: North Dakota
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Mountrail, North Dakota |
| Surname | Olson |
| Given Name | Oscar L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Additional Details | |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
| Township / Ward | Crane Creek Township 15391 |
| 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.
7 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Hazel Olson | Daughter | — | 7 | ~1913 |
| Olaf Olson | Head | — | 48 | ~1872 |
| Ole Olson | Son | — | 5 | ~1915 |
| Herbert Olson | Son | — | 11 | ~1909 |
| Kathrina Olson | Son | — | 12 | ~1908 |
| Oscar Olson | Son | — | 2 | ~1918 |
| Inga Olson | Spouse | — | 40 | ~1880 |
Census Appearances
1920
Mountrail, North …
Son, age 2
Mountrail, North Dakota · implied b. ~1918 — 7 household members
| Surname | Olson |
| Given Name | Oscar L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1930
Mountrail, North …
Son, age 14
Mountrail, North Dakota · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Can Read/Write | Yes |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1940
Mountrail-County, North …
Son, age 24
Mountrail-County, North Dakota · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | Burke Township |
| 1935 Residence (County) | Mountrail |
| Occupation | none |
| Income (1939) | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
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 Olson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Olaf Olson (~0.92 confidence) and mother Helena Olsen (~0.92 confidence) and mother Helene Olsen (~0.92 confidence) and father Olaf Olsen (~0.92 confidence) and father Olof Olsen (~0.92 confidence) and mother Inga Olson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Olaf Olson
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Helena Olsen
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Helene Olsen
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
Olaf Olsen
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Olof Olsen
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Inga Olson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Olson
Son · 1920 · age 2 · b. ~1918 · North Dakota
★ You are viewing this record
Sibling
Ole Olson
Sibling · 1920 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathrina Olson
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Olson
Sibling · 1920 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hazel Olson
Sibling · 1920 · age 7
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
1920 US Federal Census — Mountrail, North Dakota
Open full size
1920 US Federal Census — Mountrail, North Dakota
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1337unit:0573)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Bertha Ellingson | 47 | Wife | — | Norway |
| 52 | Gladys Ellingson | 17 | Daughter | — | North Dakota |
| 53 | Mildred O. Ellingson | 14 | Daughter | — | North Dakota |
| 54 | Ida B. Ellingson | 12 | Daughter | — | North Dakota |
| 55 | Cella O. Ellingson | 4 | Daughter | — | North Dakota |
| 56 | Anton Tahti | 43 | Head | Farmer | Finland |
| 57 | Anna Tahti | 40 | Wife | — | Finland |
| 58 | Alex Tahti | 18 | Son | Laborer | Finland |
| 59 | Mike Tahti | 12 | Son | — | North Dakota |
| 60 | Victor Tahti | 10 | Son | — | North Dakota |
| 61 | Ester Tahti | 8 | Daughter | — | North Dakota |
| 62 | Anna Tahti | 6 | Daughter | — | North Dakota |
| 63 | Lillie Tahti | 5 | Daughter | — | North Dakota |
| 64 | Sylvia Tahti | 3 | Daughter | — | North Dakota |
| 65 | Alice Tahti | 1 | Daughter | — | North Dakota |
| 66 | Christian Locken | 52 | Head | Farmer | Norway |
| 67 | Olive Locken | 50 | Wife | — | Norway |
| 68 | Arthur Locken | 12 | Son | — | North Dakota |
| 69 | William Simmons | 41 | Head | Farmer | Iowa |
| 70 | Agnes A. Simmons | 31 | Wife | — | Norway |
| 71 | Evelyn M. Simmons | 8 | Daughter | — | North Dakota |
| 72 | John H. Simmons | 6 | Son | — | North Dakota |
| 73 | Edna M. Simmons | 5 | Daughter | — | North Dakota |
| 74 | Clarence M. Simmons | 4 | Son | — | North Dakota |
| 75 | Raymond A. Simmons | 2 | Son | — | North Dakota |
| 76 | Milford P. Simmons | 1 | Son | — | North Dakota |
| 77 | Olaf J. Olson | 48 | Head | Farmer | Norway |
| 78 | Inga Olson | 40 | Wife | — | Norway |
| 79 | Kathrina M. Olson | 12 | Son | — | North Dakota |
| 80 | Herbert J. Olson | 11 | Son | — | North Dakota |
| 81 | Hazel L. Olson | 7 | Daughter | — | North Dakota |
| 82 | Ole E. Olson | 5 | Son | — | North Dakota |
| 83 | Oscar L. Olson THIS PERSON | 2 | Son | — | North Dakota |
| 84 | Christ Tollefson | 35 | Head | Farmer | Wisconsin |
| 85 | Andreas Tollefson | 68 | Mother | — | Norway |
| 86 | Severt Bakke | 40 | Head | Farmer | Norway |
| 87 | Carrie Bakke | 29 | Wife | — | Norway |
| 88 | Nora M. Bakke | 9 | Daughter | — | North Dakota |
| 89 | Anna Bakke | 6 | Daughter | — | North Dakota |
| 90 | Selma Bakke | 3 | Daughter | — | North Dakota |
| 91 | Albert O. Tollefson | 35 | Head | Farmer | Wisconsin |
| 92 | Anna E. Tollefson | 23 | Wife | — | West Virginia |
| 93 | Idalia G. Tollefson | 1 | Daughter | — | North Dakota |
| 94 | Chas. J. Sutherland | 48 | Head | Farmer | Iowa |
| 95 | Gracia M. Sutherland | 42 | Wife | — | Minnesota |
| 96 | Lyle Sutherland | 16 | Son | — | Iowa |
| 97 | Irene Sutherland | 10 | Daughter | — | Iowa |
| 98 | Walter Sutherland | 8 | Son | — | Iowa |
| 99 | Wayne Sutherland | 6 | Son | — | Iowa |
| 100 | James Mcmahon | 39 | Head | Farmer | Canada |
Pedigree Summary
Oscar + 4 siblings
Gen 1 · 6 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)