MO
Mary Olson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Plymouth-County, Massachusetts
Our Model Tree links this Mary Olson across the 1930 and 1940 US Censuses in Plymouth-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Plymouth-County, Massachusetts |
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton City |
| 1935 Residence (County) | Plymouth |
| Additional Details | |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | H 1 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Brockton City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Olson | Spouse | — | 37 | ~1903 |
| Raymond Olson | Son | — | 17 | ~1923 |
| Evelyn Olson | Daughter | — | 12 | ~1928 |
| Leonard Olson | Head | — | 44 | ~1896 |
| Laverne Olson | Daughter | — | 13 | ~1927 |
| Lois Olson | Daughter | — | 4 | ~1936 |
| Mary Olson | Daughter | — | 15 | ~1925 |
| Robert Olson | Son | — | 8 | ~1932 |
| Barbara Olson | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Plymouth, Massachusetts
Daughter, age 5
Plymouth, Massachusetts · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Plymouth-County, Massachusetts
Daughter, age 15
Plymouth-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Brockton City |
| 1935 Residence (County) | Plymouth |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | H 1 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Lois Olson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Laverne Olson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Olson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Olson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Olson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Olson
Sibling · 1940 · age 17
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 — Plymouth-County, Massachusetts
Open full size
1940 US Federal Census — Plymouth-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01636-00557)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Beatrice Valley | 16 | Daughter | — | Massachusetts |
| 2 | Theodore Valley | 14 | Son | — | Massachusetts |
| 3 | Daniel M. Ryan | 57 | Head | Superintendent | Massachusetts |
| 4 | Joanna M. Ryan | 54 | Wife | — | Massachusetts |
| 5 | Mertyne D. Ryan | 27 | Son | Fireman | Massachusetts |
| 6 | John M. Ryan | 24 | Son | Manager | Massachusetts |
| 7 | Evangelist La Couture | 53 | Head | Trimmer | Massachusetts |
| 8 | Delina La Couture | 43 | Wife | — | Massachusetts |
| 9 | Gloria La Couture | 18 | Daughter | — | Massachusetts |
| 10 | Marcelle La Couture | 16 | Daughter | — | Massachusetts |
| 11 | Rita La Couture | 14 | Daughter | — | Massachusetts |
| 12 | Amelia Harper | 66 | Head | — | Massachusetts |
| 13 | Abbott Higgins | 33 | Head | Carpenter | Massachusetts |
| 14 | Helen Higgins | 36 | Wife | Stitcher | Massachusetts |
| 15 | Benjamin Higgins | 72 | Father | — | Massachusetts |
| 16 | Beverly Higgins | 5 | Daughter | — | Massachusetts |
| 17 | Leonard Olson | 44 | Head | Laborer | Michigan |
| 18 | Mary Olson | 37 | Wife | — | Massachusetts |
| 19 | Raymond Olson | 17 | Son | — | Massachusetts |
| 20 | Mary Olson THIS PERSON | 15 | Daughter | — | Massachusetts |
| 21 | Laverne Olson | 13 | Daughter | — | Massachusetts |
| 22 | Evelyn Olson | 12 | Daughter | — | Massachusetts |
| 23 | Barbara Olson | 10 | Daughter | — | Massachusetts |
| 24 | Robert Olson | 8 | Son | — | Massachusetts |
| 25 | Lois Olson | 4 | Daughter | — | Massachusetts |
| 26 | Yolanda Michelini | 65 | Head | — | Massachusetts |
| 27 | Joseph Michelini | 42 | Son | Kitchenman | Massachusetts |
| 28 | Diana Michelini | 38 | Daughter | — | Massachusetts |
| 29 | Sadie H. Michelini | 28 | Daughter | Housekeeper | Massachusetts |
| 30 | Fred E. Packard | 52 | Head | Skiver | Massachusetts |
| 31 | Minnie Mccraith | 56 | Sister | Bookkeeper | Massachusetts |
| 32 | Kenneth Conley | 31 | Head | Finisher | Massachusetts |
| 33 | Helen Conley | 25 | Wife | — | Pennsylvania |
| 34 | Kenneth Jr. Conley | 5 | Son | — | Massachusetts |
| 35 | Anne Conley | 2 | Daughter | — | Massachusetts |
| 36 | Eleanor Conley | 1 | Daughter | — | Massachusetts |
| 37 | Rita Bedore | 27 | Head | Rougher | Massachusetts |
| 38 | Lillian M. Bedore | 22 | Wife | Stitcher | Massachusetts |
| 39 | Edward B. Lyons | 53 | Head | Salesman | Massachusetts |
| 40 | Esther Lyons | 44 | Wife | — | Rhode Island |
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)