MH
Mary Hennessey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Hennessey across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 7-person household.
Age 28
b. ~1912
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Laundry Worker |
| Industry | Laundry |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Laundry Worker |
| Township / Ward | Boston City |
| Est. Birth Year | ~1912 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| James Hennessey | Head | — | 66 | ~1874 |
| Julia Hennessey | Daughter | — | 33 | ~1907 |
| Richard Hennessey | Son | — | 24 | ~1916 |
| Ellen Hennessey | Daughter | — | 25 | ~1915 |
| Mary Hennessey | Daughter | — | 28 | ~1912 |
| James Hennessey | Son | — | 30 | ~1910 |
| Catherine Hennessey | Spouse | — | 64 | ~1876 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 17
Suffolk, Massachusetts · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| 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
Daughter, age 28
Suffolk-County, Massachusetts · implied b. ~1912 — 7 household members
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Laundry Worker |
| Industry | Laundry |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 900 |
| 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 Mary Hennessey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hennessey
Daughter · 1940 · age 28 · b. ~1912 · Massachusetts
★ You are viewing this record
Sibling
Julia Hennessey
Sibling · 1940 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Hennessey
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Hennessey
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Hennessey
Sibling · 1940 · age 30
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
39 people indexed on this census page (nara:1940:m-t0627-01676-00064)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ann E Crowe | 25 | Daughter | Teacher | Massachusetts |
| 2 | Samuel Waxler | 48 | Head | Superintendent | Russia |
| 3 | Julia Waxler | 44 | Wife | — | Massachusetts |
| 4 | Herbert Waxler | 13 | Son | — | Massachusetts |
| 5 | Mary Gartland | 74 | Head | — | New York |
| 6 | Edith M Gartland | 49 | Daughter | Teacher | Massachusetts |
| 7 | Agnes C Hennessey | 48 | Daughter | Asst Manager | Massachusetts |
| 8 | James Hennessey | 66 | Head | Stationary Engineer | Eire |
| 9 | Catherine Hennessey | 64 | Wife | — | Eire |
| 10 | Julia Hennessey | 33 | Daughter | Elementary Teacher | Massachusetts |
| 11 | James Hennessey | 30 | Son | Market Clerk | Massachusetts |
| 12 | Mary Hennessey THIS PERSON | 28 | Daughter | Laundry Worker | Massachusetts |
| 13 | Ellen Hennessey | 25 | Daughter | Stenographer | Massachusetts |
| 14 | Richard Hennessey | 24 | Son | Laborer | Massachusetts |
| 15 | Mary A O'Brien | 59 | Head | Elementary Teacher | Eire |
| 16 | Margaret O'Brien | 40 | Sister | Elementary Teacher | Massachusetts |
| 17 | Dorothy O'Brien | 42 | Sister | Teacher | Massachusetts |
| 18 | Justina Weeks | 48 | Housekeeper | Housekeeper | Canada-English |
| 19 | Marshall Nye | 65 | Head | Artist | Massachusetts |
| 20 | Carl Olson | 65 | Lodger | Artist | Sweden |
| 21 | Charles J Burbick | 59 | Head | Vice Patrol | England |
| 22 | Jennie Burbick | 70 | Wife | — | Canada-English |
| 23 | James S Gillespie | 70 | Head | Watchman | Massachusetts |
| 24 | Florence Gillespie | 65 | Wife | — | Massachusetts |
| 25 | Edith A Gillespie | 43 | Daughter | Nurse | Massachusetts |
| 26 | Catherine Willwerth | 45 | Sister-in-law | — | Massachusetts |
| 27 | Hiram Chubbuck | 70 | Head | — | Massachusetts |
| 28 | Edith Kelley | 50 | Housekeeper | Housekeeper | Maine |
| 29 | P. Richard Couves | 71 | Head | — | Massachusetts |
| 30 | Catherine Couves | 67 | Wife | — | Massachusetts |
| 31 | Charles Bouzane | 40 | Head | — | Newfoundland |
| 32 | Irene Bouzane | 37 | Wife | — | Massachusetts |
| 33 | Jeanne Bouzane | 16 | Daughter | — | Massachusetts |
| 34 | Frances Bouzane | 14 | Daughter | — | Massachusetts |
| 35 | Paul Bouzane | 12 | Son | — | Massachusetts |
| 36 | John J Carroll | 36 | Head | Operator | Massachusetts |
| 37 | Mary E Carroll | 36 | Wife | — | Massachusetts |
| 38 | Jeanne Carroll | 7 | Daughter | — | Massachusetts |
| 39 | Patrick J Mccarthy | 37 | Head | Patrolman | 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)