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Oscar Olson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Oscar Olson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Carl & Marie — first a son (b.~1904), then head of a 5-person household.
Age 36
b. ~1904
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Acton |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 52 |
| Income (1939) | 688 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Farm Laborer |
| Township / Ward | Acton |
| Est. Birth Year | ~1904 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Simon Olson | Head | — | 69 | ~1871 |
| Ottine Synsinen | Other | — | 50 | ~1890 |
| Oscar Olson | Son | — | 36 | ~1904 |
| Albert Olson | Son | — | 35 | ~1905 |
| Marie Olson | Spouse | — | 71 | ~1869 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 19
Middlesex, Massachusetts · implied b. ~1901 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar N. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Stenographer |
| Industry | Thread Mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 27
Middlesex, Massachusetts · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 36
Middlesex-County, Massachusetts · implied b. ~1904 — 5 household members
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Acton |
| 1935 Residence (County) | Middlesex |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 52 |
| Income (1939) | 688 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| 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 Oscar Olson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Carl Olsen (~0.92 confidence) and mother Marie Olson (~0.92 confidence) and father Simon Olson (~0.92 confidence) and father Simon Olsen (~0.92 confidence) and mother Sigrid Olsen (~0.92 confidence) and mother Maren Olsen (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Carl Olsen
b. ~1866
Source father
● Household
· direct · ~0.92
Mother
Marie Olson
b. ~1869
Source mother
● Household
· direct · ~0.92
Father
Simon Olson
b. ~1871
Source father
● Household
· direct · ~0.92
Father
Simon Olsen
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Sigrid Olsen
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Maren Olsen
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Olson
Son · 1940 · age 36 · b. ~1904 · Massachusetts
★ You are viewing this record
Sibling
Albert Olson
Sibling · 1940 · age 35
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01601-00062)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Jean L. Hendrickson | 0 | Daughter | — | Massachusetts |
| 42 | Alfred Davis | 27 | Head | Salesman | Massachusetts |
| 43 | Esther Davis | 24 | Wife | — | Massachusetts |
| 44 | Grace Davis | 2 | Daughter | — | Massachusetts |
| 45 | Stanley Paskiewicz | 16 | Lodger | Farm Laborer | Massachusetts |
| 46 | Axel Christiansen | 32 | Head | Farm Laborer | Massachusetts |
| 47 | Edith Christiansen | 28 | Wife | — | Massachusetts |
| 48 | Albert Christiansen | 9 | Son | — | Massachusetts |
| 49 | Joan Christiansen | 6 | Daughter | — | Massachusetts |
| 50 | Erwin Putnam | 33 | Head | Carpenter | Canada-Eng |
| 51 | Adelaide Putnam | 29 | Wife | — | Massachusetts |
| 52 | Betty Putnam | 4 | Daughter | — | Massachusetts |
| 53 | Frank Toskey | 51 | Head | — | — |
| 54 | Toskey | 48 | Wife | — | — |
| 55 | Toskey | 27 | — | — | — |
| 56 | Edwin H. Christofferson | 39 | Head | Farmer | Massachusetts |
| 57 | Gladys Christofferson | 37 | Wife | — | Massachusetts |
| 58 | Mildred Christofferson | 14 | Daughter | — | Massachusetts |
| 59 | Helen Christofferson | 12 | Daughter | — | Massachusetts |
| 60 | Marjorie Christofferson | 10 | Daughter | — | Massachusetts |
| 61 | Peter J. Shea | 71 | Head | — | Scotland |
| 62 | Mary L. Shea | 66 | Wife | — | Massachusetts |
| 63 | Hattie V. Lunt | 72 | Wife | — | Massachusetts |
| 64 | Harold Sampson | 35 | Head | Radio Engineer | No. Carolina |
| 65 | Ethel Sampson | 31 | Wife | — | Massachusetts |
| 66 | Douglas Sampson | 5 | Son | — | Massachusetts |
| 67 | Sally Sampson | 2 | Daughter | — | Massachusetts |
| 68 | Simon Olson | 69 | Head | — | Norway |
| 69 | Marie Olson | 71 | Wife | — | Norway |
| 70 | Albert Olson | 35 | Son | Farmer | Massachusetts |
| 71 | Oscar Olson THIS PERSON | 36 | Son | Farm Laborer | Massachusetts |
| 72 | Extra Line | None | — | — | — |
| 73 | Ottine Synsinen | 50 | Sister-in-law | — | Norway |
| 74 | Lyman J. Downey | 27 | Head | Truck Driver | Massachusetts |
| 75 | Mary C. Downey | 25 | Wife | — | Massachusetts |
| 76 | Clinton Downey | 46 | Head | Barber | Massachusetts |
| 77 | Edna Downey | 41 | Wife | — | Massachusetts |
| 78 | Frank Downey | 22 | Son | Laborer | Massachusetts |
| 79 | George Downey | 21 | Son | New Worker | Massachusetts |
| 80 | Anna Downey | 20 | Daughter | House Housework | Massachusetts |
Pedigree Summary
Oscar + 1 sibling
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 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)