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William Hart — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Hart across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 9-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Hart |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston (Mattapan) |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Assisting in Core of Engr |
| Industry | School Work Program |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 15 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Assisting In Core Of Engr |
| Township / Ward | Boston Mattapan |
| Est. Birth Year | ~1920 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Catherine Hart | Daughter | — | 5 | ~1935 |
| Helen Hart | Daughter | — | 3 | ~1937 |
| Patrick Hart | Head | — | 47 | ~1893 |
| William Hart | Son | — | 20 | ~1920 |
| James Hart | Son | — | 11 | ~1929 |
| Robert Hart | Son | — | 9 | ~1931 |
| John Hart | Son | — | 14 | ~1926 |
| Daniel Hart | Son | — | 12 | ~1928 |
| Catherine Hart | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 9
Suffolk, Massachusetts · implied b. ~1921 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hart |
| Given Name | William E. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 20
Suffolk-County, Massachusetts · implied b. ~1920 — 9 household members
| Surname | Hart |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston (Mattapan) |
| 1935 Residence (County) | Suffolk |
| Occupation | Assisting in Core of Engr |
| Industry | School Work Program |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 15 |
| 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 Hart across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Hart
Son · 1940 · age 20 · b. ~1920 · Massachusetts
★ You are viewing this record
Sibling
James Hart
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Hart
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Hart
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hart
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Hart
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Hart
Sibling · 1940 · age 3
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01677-00468)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frederick Noonan | 44 | Head | Laborer | Massachusetts |
| 2 | Mary Noonan | 42 | Wife | — | Massachusetts |
| 3 | Phyllis V. Noonan | 13 | Daughter | — | Massachusetts |
| 4 | Alice O. Noonan | 12 | Daughter | — | Massachusetts |
| 5 | John J. Noonan | 7 | Son | — | Massachusetts |
| 6 | Timothy J. O'Brien | 36 | Head | Druggist | Connecticut |
| 7 | Frances O'Brien | 36 | Wife | — | Massachusetts |
| 8 | Loretta O'Brien | 9 | Daughter | — | Massachusetts |
| 9 | Mary H. O'Brien | 7 | Daughter | — | Massachusetts |
| 10 | Patrick Hart | 47 | Head | Wool Handler | Irish Free State |
| 11 | Catherine Hart | 46 | Wife | — | Irish Free State |
| 12 | William Hart THIS PERSON | 20 | Son | Assisting In Core Of Engr | Massachusetts |
| 13 | John Hart | 14 | Son | — | Massachusetts |
| 14 | Daniel Hart | 12 | Son | — | Massachusetts |
| 15 | James E. Hart | 11 | Son | — | Massachusetts |
| 16 | Robert Hart | 9 | Son | — | Massachusetts |
| 17 | Catherine M. Hart | 5 | Daughter | — | Massachusetts |
| 18 | Helen Hart | 3 | Daughter | — | Massachusetts |
| 19 | Torsten Gustafson | 41 | Head | Carpenter | Sweden |
| 20 | Hedvig Gustafson | 39 | Wife | — | Sweden |
| 21 | Ray Gustafson | 16 | Son | — | Massachusetts |
| 22 | Thomas Madden | 44 | Head | Plasterer | Massachusetts |
| 23 | Annie Madden | 42 | Wife | — | Massachusetts |
| 24 | Dorothea Madden | 22 | Daughter | — | Massachusetts |
| 25 | Ruth Madden | 20 | Daughter | Clerk | Massachusetts |
| 26 | Grace Madden | 14 | Daughter | — | Massachusetts |
| 27 | Pauline Madden | 9 | Daughter | — | Massachusetts |
| 28 | John Johnson | 55 | Head | Watchman | Sweden |
| 29 | Olivia Johnson | 53 | Wife | — | Sweden |
| 30 | Inez Johnson | 23 | Daughter | Bookkeeper | Massachusetts |
| 31 | Michael S. Wilson | 50 | Head | Machinist | Austria |
| 32 | Rose Wilson | 50 | Wife | — | Austria |
| 33 | Bernard Wilson | 20 | Son | Laborer | Massachusetts |
| 34 | Leonard Lansdale | 62 | Head | Laborer | England |
| 35 | Mary Lansdale | 60 | Wife | — | England |
| 36 | Joseph Lansdale | 35 | Son | Electro Plater | Massachusetts |
| 37 | James D. Hennessey | 63 | Head | Order Man | Australia |
| 38 | Theresa Hennessey | 62 | Wife | — | Irish Free State |
| 39 | Eugene H. O'Connell | 35 | Head | Store Manager | Irish Free State |
| 40 | Monica O'Connell | 32 | Daughter | — | Massachusetts |
Related Census Records
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)