MO
Mary Olson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Minnesota
Our Model Tree links this Mary Olson across the 1930 and 1940 US Censuses in Polk-County, Minnesota (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 14-person household.
Age 12
b. ~1928
Female
Daughter
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Minnesota |
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Sandisville |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Township / Ward | Sandisville |
| Est. Birth Year | ~1928 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Warren Olson | Son | — | 17 | ~1923 |
| Mary Olson | Spouse | — | 51 | ~1889 |
| Ernest Olson | Son | — | 23 | ~1917 |
| Hulda Olson | Daughter | — | 21 | ~1919 |
| Vernon Olson | Son | — | 32 | ~1908 |
| Dave Olson | Head | — | 59 | ~1881 |
| Arvid Olson | Son | — | 30 | ~1910 |
| Fern Olson | Daughter | — | 10 | ~1930 |
| Walter Sand | Other | — | 50 | ~1890 |
| Leonard Olson | Son | — | 28 | ~1912 |
| Carl Olson | Son | — | 8 | ~1932 |
| Dave Olson | Son | — | 14 | ~1926 |
| Mary Olson | Daughter | — | 12 | ~1928 |
| Mylo Olson | Son | — | 13 | ~1927 |
Census Appearances
1930
Polk, Minnesota
Other, age 3
Polk, Minnesota · implied b. ~1927 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | g. daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Can Read/Write | No |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Polk-County, Minnesota
Daughter, age 12
Polk-County, Minnesota · implied b. ~1928 — 14 household members
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Sandisville |
| 1935 Residence (County) | Polk |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Olson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Olson
Daughter · 1940 · age 12 · b. ~1928 · Minnesota
★ You are viewing this record
Sibling
Hulda Olson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Olson
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ernest Olson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dave Olson
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mylo Olson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vernon Olson
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Warren Olson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arvid Olson
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Olson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fern Olson
Sibling · 1940 · age 10
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 — Polk-County, Minnesota
Open full size
1940 US Federal Census — Polk-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01949-01039)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clara Yatimes | 34 | wife | — | Minnesota |
| 42 | Melvina Yatimes | 20 | daughter | Servant | Minnesota |
| 43 | Lorraine Yatimes | 15 | daughter | — | Minnesota |
| 44 | Cleon Andresen | 53 | head | Farming | Minnesota |
| 45 | Emma Andresen | 48 | wife | — | Minnesota |
| 46 | Wallace Andresen | 18 | son | Farm Laborer | Minnesota |
| 47 | Harlene Andresen | 16 | son | — | Minnesota |
| 48 | Mike Pietrzak | 61 | head | — | Poland |
| 49 | Josephine Pietrzak | 58 | wife | — | North Dakota |
| 50 | Henry Pietrzak | 22 | son | Farm Laborer | North Dakota |
| 51 | Florence Pietrzak | 18 | daughter | Servant | North Dakota |
| 52 | Lilly Pietrzak | 5 | granddaughter | — | Minnesota |
| 53 | George Pitsch | 46 | head | Farming | Minnesota |
| 54 | Julia Pitsch | 36 | wife | — | North Dakota |
| 55 | Dorothy Pitsch | 12 | daughter | — | Minnesota |
| 56 | Shirley Pitsch | 11 | daughter | — | Minnesota |
| 57 | Thomas Pitsch | 7 | son | — | Minnesota |
| 58 | Betty Pitsch | 6 | daughter | — | Minnesota |
| 59 | Harold Stavig | 36 | lodger | Farm Laborer | Minnesota |
| 60 | Dave Olson | 59 | head | Farming | North Dakota |
| 61 | Mary Olson | 51 | wife | — | Sweden |
| 62 | Vernon Olson | 32 | son | Farm Laborer | North Dakota |
| 63 | Arvid Olson | 30 | son | Farm Laborer | North Dakota |
| 64 | Leonard Olson | 28 | son | Trucking | North Dakota |
| 65 | Ernest Olson | 23 | son | Farm Laborer | Minnesota |
| 66 | Hulda Olson | 21 | daughter | — | Minnesota |
| 67 | Warren Olson | 17 | son | — | Minnesota |
| 68 | Dave Olson | 14 | son | — | Minnesota |
| 69 | Mylo Olson | 13 | son | — | Minnesota |
| 70 | Mary Olson THIS PERSON | 12 | daughter | — | Minnesota |
| 71 | Fern Olson | 10 | daughter | — | Minnesota |
| 72 | Carl Olson | 8 | son | — | Minnesota |
| 73 | Walter C. Sand | 50 | lodger | Farm Laborer | Minnesota |
| 74 | Mike Lindquist | 24 | head | Sewer Project | Minnesota |
| 75 | Margaret Lindquist | 21 | wife | — | Minnesota |
| 76 | Lulu Mae Lindquist | 3 | daughter | — | Minnesota |
| 77 | Betty Jane Lindquist | 2 | daughter | — | Minnesota |
| 78 | Wm. Jr. Lindquist | 1 | son | — | Minnesota |
| 79 | Mike Jacobson | 61 | head | — | Norway |
| 80 | Victor Hendrickson | 40 | head | — | Minnesota |
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)