WS
William Sweeney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Sweeney across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Katherine & William — first a head (b.~1892), then head of a 3-person household.
Age 48
b. ~1892
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Sweeney |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Arlington Town |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Salesman |
| Industry | Automobiles |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2000 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Salesman |
| Township / Ward | Arlington Town |
| Est. Birth Year | ~1892 |
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 |
|---|---|---|---|---|
| William Sweeney | Head | — | 48 | ~1892 |
| William Sweeney | Son | — | 11 | ~1929 |
| Agnes Sweeney | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 24
Middlesex, Massachusetts · implied b. ~1896 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sweeney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Salesman |
| Industry | Retail White Goods |
| 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 36
Middlesex, Massachusetts · implied b. ~1894 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sweeney |
| Given Name | William Patrick |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Salesman |
| Industry | Insurance |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 48
Middlesex-County, Massachusetts · implied b. ~1892 — 3 household members
| Surname | Sweeney |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Arlington Town |
| 1935 Residence (County) | Middlesex |
| Occupation | Salesman |
| Industry | Automobiles |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2000 |
| Highest Grade | H-4 |
| 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 William Sweeney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Katherine Sweeney (~0.92 confidence) and father William Sweeney (~0.92 confidence) and father James Sweeney (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Katherine Sweeney
b. ~1860
Source mother
● Household
· direct · ~0.92
Father
William Sweeney
b. ~1860
Source father
● Household
· direct · ~0.92
Father
James Sweeney
b. ~1880
Source father
● Household
· direct · ~0.92
This person
Anchor record
William Sweeney
Head · 1940 · age 48 · b. ~1892 · 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-t0627-01601-00409)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas F. Shady | 46 | Head | Switchman | Irish Free State |
| 2 | Nora M. Shady | 47 | Wife | — | Irish Free State |
| 3 | Margaret M. Shady | 10 | Daughter | — | Massachusetts |
| 4 | Thomas F. Shady | 9 | Son | — | Massachusetts |
| 5 | William J. Mullins | 50 | Head | Clerk | Massachusetts |
| 6 | Mary A. Mullins | 34 | Wife | — | Poland |
| 7 | Virginia Mullins | 5 | Daughter | — | Massachusetts |
| 8 | Michel Melanson | 27 | Boarder | — | Massachusetts |
| 9 | Louis G. Pereira | 38 | Head | Steward | Portugal |
| 10 | Albertina Pereira | 34 | Wife | — | Portugal |
| 11 | Albert F. Pereira | 13 | Son | — | Massachusetts |
| 12 | Manuel V. Gomes | 61 | Head | Bed Maker | Portugal |
| 13 | Adelina Gomes | 61 | Wife | — | Portugal |
| 14 | Mary Gomes | 37 | Daughter | Clerk | Portugal |
| 15 | Louisa Gomes | 29 | Daughter | — | Massachusetts |
| 16 | John Gomes | 26 | Son | Messenger | Massachusetts |
| 17 | Niles L. Weeks | 36 | Head | Baker | Sweden |
| 18 | Lillian Weeks | 20 | Wife | Secretary | Massachusetts |
| 19 | Jane L. Weeks | 3 | Daughter | — | Massachusetts |
| 20 | Margaret F. Buffey | 35 | Sister-in-law | — | Massachusetts |
| 21 | William J. Sweeney THIS PERSON | 48 | Head | Salesman | Massachusetts |
| 22 | Agnes G. Sweeney | 42 | Wife | — | Massachusetts |
| 23 | William J. Sweeney | 11 | Son | — | Massachusetts |
| 24 | George J. Ellerdan | 47 | Head | Painter | Massachusetts |
| 25 | Ethel S. Ellerdan | 45 | Wife | — | Irish Free State |
| 26 | Daniel R. Ellerdan | 18 | Son | — | Massachusetts |
| 27 | George J. Ellerdan | 15 | Son | — | Massachusetts |
| 28 | Virginia A. Ellerdan | 14 | Daughter | — | Massachusetts |
| 29 | Ruth L. Ellerdan | 13 | Daughter | — | Massachusetts |
| 30 | Theresa D. Ellerdan | 10 | Daughter | — | Massachusetts |
| 31 | Daniel Sullivan | 42 | Head | Laborer | Massachusetts |
| 32 | Margaret M. Sullivan | 40 | Wife | — | Massachusetts |
| 33 | Joseph Sullivan | 16 | Son | — | Massachusetts |
| 34 | Mary Sullivan | 15 | Daughter | — | Massachusetts |
| 35 | Ernest Collingwood | 37 | Head | — | Maine |
| 36 | Sarah M. Collingwood | 30 | Wife | — | Newfoundland |
| 37 | Janet W. Collingwood | 8 | Daughter | — | Massachusetts |
| 38 | Robert A. Collingwood | 7 | Son | — | Massachusetts |
| 39 | Linwood F. Stetson | 32 | Head | — | Massachusetts |
| 40 | Edith E. Stetson | 26 | Wife | — | Vermont |
Pedigree Summary
William
Gen 1 · 3 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)