MH
Mary Hennessy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Hennessy across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1895), then head of a 7-person household.
Age 45
b. ~1895
Female
Spouse
Born: Irish Free State
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Chauffeur |
| Industry | Rent Car Agency |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birthplace (normalized) | irish free state |
| Occupation | Chauffeur |
| Township / Ward | Boston City |
| Est. Birth Year | ~1895 |
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 |
|---|---|---|---|---|
| William Hennessy | Son | — | 11 | ~1929 |
| Mary Hennessy | Spouse | — | 45 | ~1895 |
| John Hennessy | Son | — | 12 | ~1928 |
| Mary Hennessy | Daughter | — | 4 | ~1936 |
| John Hennessy | Head | — | 49 | ~1891 |
| Eleanor Hennessy | Daughter | — | 16 | ~1924 |
| Francis Hennessy | Son | — | 9 | ~1931 |
Census Appearances
1930
Suffolk, Massachusetts
Spouse, age 34
Suffolk, Massachusetts · implied b. ~1896 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary J |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| Naturalization Status | Alien |
| Year of Immigration | 1927 |
| Age at First Marriage | 24 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birthplace (normalized) | irish free state |
1940
Suffolk-County, Massachusetts
Spouse, age 45
Suffolk-County, Massachusetts · implied b. ~1895 — 7 household members
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Naturalization Status | Naturalized |
| Occupation | Chauffeur |
| Industry | Rent Car Agency |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | 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 Hennessy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Hennessy
Spouse · 1940 · age 45 · b. ~1895 · Massachusetts
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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-t0627-01668-00445)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Daniel Mcphee | 70 | Head | — | Massachusetts |
| 42 | Mary Mcphee | 76 | Wife | — | Canada-English |
| 43 | Helen Seeley | 56 | Head | — | Massachusetts |
| 44 | Mary Seeley | 28 | Daughter | Stenographer | Massachusetts |
| 45 | Margaret Seeley | 26 | Daughter | Nurse | Massachusetts |
| 46 | Helmar Christman | 55 | Head | Stationary Engineer | Germany |
| 47 | Ella Christman | 51 | Wife | — | Massachusetts |
| 48 | Jane Christman | 25 | Daughter | Cook'S Aide | Massachusetts |
| 49 | Daniel Christman | 22 | Son | Assembler | Massachusetts |
| 50 | Margaret Christman | 20 | Daughter | Cook'S Aide | Massachusetts |
| 51 | Helmar Jr. Christman | 18 | Son | Office Boy | Massachusetts |
| 52 | Elizabeth Christman | 13 | Daughter | — | Massachusetts |
| 53 | John J. Griffin | 58 | Head | Boiler Maker | Irish Free State |
| 54 | Johanna Griffin | 54 | Wife | — | Irish Free State |
| 55 | John H. Griffin | 28 | Son | Tractor Trailer Driver | Massachusetts |
| 56 | Mary Griffin | 26 | Daughter | Stenographer | Massachusetts |
| 57 | Michael Griffin | 23 | Son | Steam Boiler Helper | Massachusetts |
| 58 | Helen Griffin | 19 | Daughter | — | Massachusetts |
| 59 | James Griffin | 17 | Son | — | Massachusetts |
| 60 | Margaret Griffin | 14 | Daughter | — | Massachusetts |
| 61 | Thomas Griffin | 7 | Son | — | Massachusetts |
| 62 | James Mccarthy | 51 | Head | Laborer | Massachusetts |
| 63 | Mary Mccarthy | 53 | Wife | — | Irish Free State |
| 64 | John D. Mccarthy | 25 | Son | Lineman | Massachusetts |
| 65 | Mary C. Mccarthy | 22 | Daughter | Bookkeeper | Massachusetts |
| 66 | Daniel K. Mccarthy | 17 | Son | — | Massachusetts |
| 67 | Helena Mccarthy | 14 | Daughter | — | Massachusetts |
| 68 | Mary Ford | 77 | Head | — | Irish Free State |
| 69 | John J. Hennessy | 49 | Head | Winder | Massachusetts |
| 70 | Mary Hennessy THIS PERSON | 45 | Wife | Chauffeur | Irish Free State |
| 71 | Eleanor Hennessy | 16 | Daughter | — | Massachusetts |
| 72 | John Hennessy | 12 | Son | — | Massachusetts |
| 73 | William Hennessy | 11 | Son | — | Massachusetts |
| 74 | Francis Hennessy | 9 | Son | — | Massachusetts |
| 75 | Mary Hennessy | 4 | Daughter | — | Massachusetts |
| 76 | Patrick J. O'Mara | 56 | Head | Chauffeur | Irish Free State |
| 77 | Ellen O'Mara | 57 | Wife | — | Irish Free State |
| 78 | Nora O'Mara | 22 | Daughter | Clerk Billing | Massachusetts |
| 79 | Mary B. O'Mara | 20 | Daughter | Typist | Massachusetts |
| 80 | Agnes Hennessy | 47 | Daughter | — | England |
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)