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.~1926), then head of a 10-person household.
Age 14
b. ~1926
Female
Daughter
Born: Irish Free State
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 | 14 |
| Marital Status | Single |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | Hs 8 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
| Township / Ward | Boston City |
| Est. Birth Year | ~1926 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Patrick Hennessey | Head | — | 44 | ~1896 |
| Patrick Hennessey | Son | — | 9 | ~1931 |
| Katherine Hennessey | Daughter | — | 6 | ~1934 |
| Mary Hennessey | Spouse | — | 44 | ~1896 |
| Margaret Hennessey | Daughter | — | 17 | ~1923 |
| John Hennessey | Son | — | 18 | ~1922 |
| Sheila Hennessey | Daughter | — | 4 | ~1936 |
| Helen Hennessey | Daughter | — | 11 | ~1929 |
| Eamon Hennessey | Son | — | 7 | ~1933 |
| Mary Hennessey | Daughter | — | 14 | ~1926 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 4
Suffolk, Massachusetts · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Irish Free State |
| Naturalization Status | Alien |
| Year of Immigration | 1927 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Mother Tongue | English |
| Birthplace (normalized) | irish free state |
1940
Suffolk-County, Massachusetts
Daughter, age 14
Suffolk-County, Massachusetts · implied b. ~1926 — 10 household members
| Surname | Hennessey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Naturalization Status | Naturalized |
| Highest Grade | Hs 8 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
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 14 · b. ~1926 · Massachusetts
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Sibling
John Hennessey
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Hennessey
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Hennessey
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sheila Hennessey
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eamon Hennessey
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Hennessey
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Hennessey
Sibling · 1940 · age 9
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-t0627-01672-00100)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Irving G. Fletcher | 24 | Head | Laborer | Massachusetts |
| 42 | Florence Fletcher | 25 | Wife | — | Massachusetts |
| 43 | Patrick J. Hennessey | 44 | Head | Cabinet Maker | Irish Free State |
| 44 | Mary E. Hennessey | 44 | Wife | — | Irish Free State |
| 45 | John T. Hennessey | 18 | Son | Clerk | Irish Free State |
| 46 | Margaret Hennessey | 17 | Daughter | — | Irish Free State |
| 47 | Mary Hennessey THIS PERSON | 14 | Daughter | — | Irish Free State |
| 48 | Helen Hennessey | 11 | Daughter | — | Massachusetts |
| 49 | Patrick Hennessey | 9 | Son | — | Massachusetts |
| 50 | Eamon Hennessey | 7 | Son | — | Massachusetts |
| 51 | Katherine Hennessey | 6 | Daughter | — | Massachusetts |
| 52 | Sheila Hennessey | 4 | Daughter | — | Massachusetts |
| 53 | Mabel S. Low | 74 | Head | — | Pennsylvania |
| 54 | Mabel Simonds | 42 | Daughter | — | Massachusetts |
| 55 | James Simonds | 16 | Grandson | — | Massachusetts |
| 56 | Alice Harris | 22 | Granddaughter | — | Massachusetts |
| 57 | Frederick Harris | 3 | Grt Grandson | — | Massachusetts |
| 58 | James Harris | 1 | Grt Grandson | — | Massachusetts |
| 59 | Lester Low | 38 | Son | — | Massachusetts |
| 60 | Matthew Crawford | 40 | Lodger | — | Massachusetts |
| 61 | Robert J. Coulsey | 56 | Head | Laborer | Massachusetts |
| 62 | Miriam H. Coulsey | 45 | Wife | — | Massachusetts |
| 63 | Robert Coulsey | 27 | Son | Clerk | Massachusetts |
| 64 | Charles V. Coulsey | 22 | Son | Clerk | Massachusetts |
| 65 | Kenneth N. Coulsey | 20 | Son | New Worker | Massachusetts |
| 66 | Dorothy Coulsey | 19 | Daughter | New Worker | Massachusetts |
| 67 | Gladys Coulsey | 15 | Daughter | — | Massachusetts |
| 68 | Donald Coulsey | 10 | Son | — | Massachusetts |
| 69 | Richard H. Coulsey | 1 | Son | — | Massachusetts |
| 70 | Eugene E. Mc Carthy | 36 | Head | News Stand Oper. | Massachusetts |
| 71 | Catherine Mc Carthy | 35 | Wife | — | Massachusetts |
| 72 | Catherine M. Mc Carthy | 4 | Daughter | — | Massachusetts |
| 73 | Jeanne L. Mc Carthy | 1 | Daughter | — | Massachusetts |
| 74 | Albert M. Halpin | 36 | Head | Paperhanger | Massachusetts |
| 75 | Ellen R. Halpin | 26 | Wife | — | Massachusetts |
| 76 | Herbert Robinson | 51 | Head | Cabinet Maker | Maine |
| 77 | Mary Robinson | 51 | Wife | — | Canada-English |
| 78 | Clayton Robinson | 23 | Son | Mechanic | Canada-English |
| 79 | Phylis Robinson | 13 | Daughter | — | Massachusetts |
| 80 | Ruth J. Clark | 46 | Sister-in-law | Stitcher | Canada-English |
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)