MO
Mary Olson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Erie-County, Pennsylvania
Our Model Tree links this Mary Olson across the 1920, 1930 and 1940 US Censuses in Erie-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Lilly & Tilly — first a daughter (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Female
Daughter
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, Pennsylvania |
| Surname | Olson |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Erie |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 400 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Maid |
| Township / Ward | Erie |
| Est. Birth Year | ~1913 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Olson | Daughter | — | 27 | ~1913 |
| John Olson | Son | — | 27 | ~1913 |
| Lilly Olson | Head | — | 62 | ~1878 |
| Helga Olson | Daughter | — | 26 | ~1914 |
Census Appearances
1920
Erie, Pennsylvania
Daughter, age 8
Erie, Pennsylvania · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | none |
| Speaks English | Yes |
| Mother Tongue | Finnish |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Erie, Pennsylvania
Daughter, age 19
Erie, Pennsylvania · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | Maid |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Erie-County, Pennsylvania
Daughter, age 27
Erie-County, Pennsylvania · implied b. ~1913 — 4 household members
| Surname | Olson |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Erie |
| 1935 Residence (County) | Erie |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 400 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Lilly Olson (~0.92 confidence) and mother Tilly Olson (~0.92 confidence) and father Robert Hakala (~0.92 confidence) and mother Sarah Hakala (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Lilly Olson
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Tilly Olson
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Robert Hakala
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Sarah Hakala
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Olson
Daughter · 1940 · age 27 · b. ~1913 · Pennsylvania
★ You are viewing this record
Sibling
John Olson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helga Olson
Sibling · 1940 · age 26
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 — Erie-County, Pennsylvania
Open full size
1940 US Federal Census — Erie-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03649-00146)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frederick Korn | 51 | Head | — | Ohio |
| 42 | R. E. S. Rogers | 54 | Head | — | Ohio |
| 43 | Harry Walker | 57 | Head | Laborer | Ohio |
| 44 | John Daincanton | 60 | Head | Machinist | Italy |
| 45 | Mary Daincanton | 56 | Wife | — | Italy |
| 46 | Margaret Daincanton | 34 | Daughter | Housework | Italy |
| 47 | Anthony Daincanton | 25 | Son | Salesman | Ohio |
| 48 | Daniel Daincanton | 21 | Son | Musician | Ohio |
| 49 | Andrew J. Allen | 44 | Head | Welder | Ohio |
| 50 | Margaret M. Allen | 37 | Wife | — | Ohio |
| 51 | William J. Allen | 17 | Son | Newswriter | Ohio |
| 52 | Mary Allen | 13 | Daughter | — | Ohio |
| 53 | Ursula M. Allen | 11 | Daughter | — | Ohio |
| 54 | Patricia M. Allen | 2 | Daughter | — | Ohio |
| 55 | John T. Chellis | 50 | Brother-in-law | Roller Operator | Ohio |
| 56 | Cyrus J. Seyboldt | 36 | Head | Supervisor | Ohio |
| 57 | Mildred M. Seyboldt | 33 | Wife | — | Ohio |
| 58 | Joanne M. Seyboldt | 11 | Daughter | — | Ohio |
| 59 | James G. Seyboldt | 4 | Son | — | Ohio |
| 60 | Robert E. Mandeville | 23 | Head | Inspector | Ohio |
| 61 | Mary Margaret Mandeville | 20 | Wife | — | Ohio |
| 62 | Lilly Olson | 62 | Head | — | Finland |
| 63 | Mary E. Olson THIS PERSON | 27 | Daughter | Maid | Washington |
| 64 | Helga Olson | 26 | Daughter | Laborer | Washington |
| 65 | John Olson | 27 | Son | Seaman | Nevada |
| 66 | Joseph C. Viera | 35 | Head | Welder | Portugal |
| 67 | Margaret M. Viera | 33 | Wife | — | Ohio |
| 68 | Emile J. Sola | 52 | Head | Machinist | Finland |
| 69 | Hilma Sola | 49 | Wife | — | Finland |
| 70 | Phillip H. Rancho | 51 | Head | Barber | Ohio |
| 71 | Helen M. Rancho | 49 | Wife | — | Ohio |
| 72 | Frances C. Rancho | 22 | Daughter | Finisher & Packer | Ohio |
| 73 | Joseph L. Kosa | 42 | Head | Metal Polisher | Ohio |
| 74 | Martha F. E. Kosa | 44 | Wife | — | Ohio |
| 75 | Joseph C. Kosa | 18 | Son | — | Ohio |
| 76 | James E. Kosa | 15 | Son | — | Ohio |
| 77 | John P. Kosa | 12 | Son | — | Ohio |
| 78 | John H. Temple | 28 | Head | Seaman | Ohio |
| 79 | Audrey Temple | 25 | Wife | — | Ohio |
| 80 | Shirley M. Temple | 10 | Daughter | — | Ohio |
Pedigree Summary
Mary + 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)