WP
William Peterson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Peterson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 3-person household.
Age 56
b. ~1884
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Peterson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Electrician |
| Industry | Contracting |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 2042 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Electrician |
| Township / Ward | Belmont |
| Est. Birth Year | ~1884 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Emma Peterson | Daughter | — | 21 | ~1919 |
| William Peterson | Head | — | 56 | ~1884 |
| Serafia Peterson | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Middlesex, Massachusetts
Head, age 36
Middlesex, Massachusetts · implied b. ~1884 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Sweden |
| Year of Immigration | 1901 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Electrician |
| Industry | Electrical |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Sweden |
| Year of Naturalization | 1909 |
| Birthplace (normalized) | sweden |
1930
Middlesex, Massachusetts
Head, age 46
Middlesex, Massachusetts · implied b. ~1884 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1894 |
| Age at First Marriage | 28 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Electrician |
| Industry | Electrical |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Home Value / Rent | 12000 |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Middlesex-County, Massachusetts
Head, age 56
Middlesex-County, Massachusetts · implied b. ~1884 — 3 household members
| Surname | Peterson |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Electrician |
| Industry | Contracting |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 2042 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 William Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Peterson
Head · 1940 · age 56 · b. ~1884 · Massachusetts
★ You are viewing this record
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-t0627-01603-00074)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charles Pearson | 54 | Head | Electrician | Sweden |
| 42 | Ester Pearson | 53 | Wife | — | Sweden |
| 43 | Ruth Pearson | 20 | Daughter | — | Massachusetts |
| 44 | Arthur Shaw | 40 | Head | Newspaper Distributor | Massachusetts |
| 45 | Elizabeth Shaw | 33 | Wife | — | Canada English |
| 46 | William Shaw | 18 | Son | New Worker | Maine |
| 47 | Edward Shaw | 17 | Son | — | Maine |
| 48 | Arthur Shaw | 9 | Son | — | Massachusetts |
| 49 | Alfred Scotten | 68 | Head | Janitor'S Helper | Massachusetts |
| 50 | Janet Scotten | 68 | Wife | — | Massachusetts |
| 51 | Eva Purson | 47 | Head | Stenographer | Massachusetts |
| 52 | Harriet Purson | 73 | Mother | — | Canada English |
| 53 | William Nye | 54 | Head | Traveling Salesman | Massachusetts |
| 54 | Bertha Nye | 52 | Wife | — | Massachusetts |
| 55 | Willa Nye | 26 | Daughter | Dramatic Teacher | Massachusetts |
| 56 | Josephine Rockett | 70 | Head | — | New York State |
| 57 | Thomas Rockett | 40 | Son | Engineer | Massachusetts |
| 58 | Helen Rockett | 37 | Daughter | Nurse | Massachusetts |
| 59 | Francis Rockett | 30 | Son | Reporter | Massachusetts |
| 60 | Kendall Chase | 38 | Head | Operator | Massachusetts |
| 61 | Eileen Chase | 35 | Wife | — | Rhode Island |
| 62 | Carolyn Chase | 8 | Daughter | — | Massachusetts |
| 63 | Herbert Spencer | 57 | Head | Carpenter | Canada English |
| 64 | Lilla Spencer | 60 | Wife | — | Canada English |
| 65 | Ernest Spencer | 27 | Son | Truck Driver | Canada English |
| 66 | Chester Spencer | 20 | Son | Clerk | New England |
| 67 | Audrey Spencer | 15 | Daughter | — | Canada English |
| 68 | William Peterson THIS PERSON | 56 | Head | Electrician | Sweden |
| 69 | Serafia Peterson | 57 | Wife | — | Sweden |
| 70 | Emma Peterson | 21 | Daughter | Secretary | Massachusetts |
| 71 | Sidney Swaine | 47 | Head | Chemical Engineer | Canada English |
| 72 | Bessie Swaine | 47 | Wife | — | Massachusetts |
| 73 | Russell Swaine | 17 | Son | — | Massachusetts |
| 74 | Phyllis Schrak | 71 | Head | Sexton | Massachusetts |
| 75 | Annie Schrak | 69 | Wife | — | Maine |
| 76 | Grace C. Snow | 65 | Sister in law | — | Maine |
| 77 | John Kelly | 43 | Head | Truck Driver | New York State |
| 78 | Sarah J. Kelly | 43 | Wife | — | Irish Free State |
| 79 | John J. Kelly | 10 | Son | — | Massachusetts |
| 80 | Frederick Kelly | 7 | Son | — | Massachusetts |
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)