MO
Mary Olsen — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Roberts, South Dakota
Our Model Tree links this Mary Olsen across the 1920 and 1930 US Censuses in Roberts, South Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1875), then head of a 10-person household.
Age 45
b. ~1875
Female
Spouse
Born: Denmark
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Roberts, South Dakota |
| Surname | Olsen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Denmark |
| Year of Immigration | 1887 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Birth Country | Denmark |
| Year of Naturalization | 1887 |
| Birthplace (normalized) | denmark |
| Township / Ward | Wismer Township |
| Est. Birth Year | ~1875 |
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.
10 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Edward Olsen | Son | — | 13 | ~1907 |
| Marie Olsen | Daughter | — | 10 | ~1910 |
| Howard Olsen | Son | — | 5 | ~1915 |
| Mary Olsen | Spouse | — | 45 | ~1875 |
| Eda Olsen | Daughter | — | 16 | ~1904 |
| Henry Olsen | Son | — | 20 | ~1900 |
| Nels Olsen | Head | — | 54 | ~1866 |
| Boy Olsen | Son | — | 15 | ~1905 |
| Almond Olsen | Son | — | 11 | ~1909 |
| Nels Olsen | Son | — | 8 | ~1912 |
Census Appearances
1920
Roberts, South …
Spouse, age 45
Roberts, South Dakota · implied b. ~1875 — 10 household members
| Surname | Olsen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Denmark |
| Year of Immigration | 1887 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Birth Country | Denmark |
| Year of Naturalization | 1887 |
| Birthplace (normalized) | denmark |
1930
Roberts, South …
Other, age 55
Roberts, South Dakota · implied b. ~1875 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Maren |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1887 |
| Age at First Marriage | 27 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
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 Mary Olsen across 2 US Census years (1920 and 1930) in Roberts, South Dakota, using XGBoost record linkage.
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This person
Anchor record
Mary Olsen
Spouse · 1920 · age 45 · b. ~1875 · South Dakota
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Roberts, South Dakota
Open full size
1920 US Federal Census — Roberts, South Dakota
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1726unit:0301)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Celestia Rau | 7 | Daughter | — | South Dak |
| 2 | Robert Rau | 6 | Son | — | South Dak |
| 3 | Gladys Rau | 5 | Daughter | — | South Dak |
| 4 | Evelin Rau | 3 | Daughter | — | South Dak |
| 5 | Norma Rau | 2 | Son | — | South Dak |
| 6 | Clinton Rau | 0 | Son | — | South Dak |
| 7 | William Berndt | 46 | Head | Farmer | Wisconsin |
| 8 | Emma Berndt | 39 | Wife | — | Wisconsin |
| 9 | Harold Berndt | 14 | Son | — | South Dak |
| 10 | Fred Berndt | 37 | Hired hand | Laborer | Minnesota |
| 11 | John Berg | 37 | Head | Farmer | Minnesota |
| 12 | Lizzie Berg | 35 | Wife | — | Minnesota |
| 13 | Clifford Berg | 11 | Son | — | South Dak |
| 14 | Bernice Berg | 8 | Daughter | — | South Dak |
| 15 | Melvin Berg | 7 | Son | — | South Dak |
| 16 | Howard Berg | 4 | Son | — | South Dak |
| 17 | Dick Monson | 53 | Head | Farmer | Norway |
| 18 | Mary Monson | 42 | Wife | — | Norway |
| 19 | Martin Monson | 18 | Son | Laborer | South Dak |
| 20 | Christiana Monson | 14 | Daughter | — | South Dak |
| 21 | Amanda Monson | 12 | Daughter | — | South Dak |
| 22 | Dora Monson | 10 | Daughter | — | South Dak |
| 23 | Leonora Monson | 8 | Daughter | — | South Dak |
| 24 | Lydia Monson | 6 | Daughter | — | South Dak |
| 25 | William Alaine | 46 | Head | Farmer | Minnesota |
| 26 | Katherine Alaine | 43 | Wife | — | Minnesota |
| 27 | Walter Alaine | 18 | Son | Laborer | South Dak |
| 28 | Clarence Alaine | 17 | Son | Laborer | South Dak |
| 29 | Hattie Alaine | 15 | Daughter | — | Minnesota |
| 30 | Dolly Alaine | 14 | Daughter | — | South Dak |
| 31 | Anabel Alaine | 10 | Daughter | — | South Dak |
| 32 | Virgil Alaine | 5 | Son | — | South Dak |
| 33 | Nels Olsen | 54 | Head | Farmer | Denmark |
| 34 | Mary Olsen THIS PERSON | 45 | Wife | — | Denmark |
| 35 | Henry E Olsen | 20 | Son | Laborer | South Dak |
| 36 | Eda Olsen | 16 | Daughter | — | South Dak |
| 37 | Boy Olsen | 15 | Son | — | South Dak |
| 38 | Edward Olsen | 13 | Son | — | South Dak |
| 39 | Almond Olsen | 11 | Son | — | South Dak |
| 40 | Marie Olsen | 10 | Daughter | — | South Dak |
| 41 | Nels Olsen | 8 | Son | — | South Dak |
| 42 | Howard Olsen | 5 | Son | — | South Dak |
| 43 | Ole O Stav | 52 | Head | Farmer | Norway |
| 44 | Annie Stav | 48 | Wife | — | Norway |
| 45 | Ida Stav | 23 | Daughter | — | South Dak |
| 46 | Edward Stav | 21 | Son | Laborer | South Dak |
| 47 | Melvin Stav | 18 | Son | Laborer | South Dak |
| 48 | Alice Stav | 14 | Daughter | — | South Dak |
| 49 | Oscar Stav | 12 | Son | — | South Dak |
| 50 | Arthur Stav | 8 | Son | — | South Dak |
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)