JH
John Hennessey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Hennessey across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 8-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | 860 |
| Hours Worked | 24 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | 860 |
| Township / Ward | Cambridge |
| Est. Birth Year | ~1917 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rita Hennessey | Daughter | — | 21 | ~1919 |
| Daniel Hennessey | Head | — | 49 | ~1891 |
| Daniel Hennessey | Son | — | 19 | ~1921 |
| William Hennessey | Son | — | 17 | ~1923 |
| John Hennessey | Son | — | 23 | ~1917 |
| Paul Hennessey | Son | — | 13 | ~1927 |
| Joseph Hennessey | Son | — | 15 | ~1925 |
| Laura Hennessey | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 11
Middlesex, Massachusetts · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennesy |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada-English |
| Mother's Birthplace | Canada-English |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 23
Middlesex-County, Massachusetts · implied b. ~1917 — 8 household members
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Occupation | 860 |
| Hours Worked | 24 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| 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 John Hennessey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hennessey
Son · 1940 · age 23 · b. ~1917 · Massachusetts
★ You are viewing this record
Sibling
Rita Hennessey
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Hennessey
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Hennessey
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Hennessey
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Hennessey
Sibling · 1940 · age 19
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 — 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-t0627-01683-00352)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Delphine Long | 46 | Mother | Stitcher | Portugal |
| 2 | Annie S. Petrules | 53 | Head | Shoe Maker | Lithuania |
| 3 | Ursula Vinckus | 57 | Lodger | Stitcher | Lithuania |
| 4 | Arthur S. St. George | 64 | Head | Foreman | Massachusetts |
| 5 | Mary E. St. George | 59 | Wife | — | Massachusetts |
| 6 | Barry C. St. George | 32 | Son | Examiner | Massachusetts |
| 7 | Elmer L. St. George | 30 | Son | Laborer | Massachusetts |
| 8 | Isabell F. St. George | 27 | Daughter | Clerk | Massachusetts |
| 9 | Lillian M. St. George | 25 | Daughter | Clerk | Massachusetts |
| 10 | Earl J. St. George | 23 | Son | Helper | Massachusetts |
| 11 | Dorothy J. St. George | 21 | Daughter | Typist | Massachusetts |
| 12 | Leslie S. St. George | 19 | Son | Spooler | Massachusetts |
| 13 | Patrick Hennessey | 69 | Head | — | Eire |
| 14 | Bridget Hennessey | 73 | Wife | — | Eire |
| 15 | Daniel Hennessey | 49 | Head | Laborer | Massachusetts |
| 16 | Laura E. Hennessey | 47 | Wife | — | Canada |
| 17 | John Hennessey THIS PERSON | 23 | Son | 860 | Massachusetts |
| 18 | Rita Hennessey | 21 | Daughter | Packer | Massachusetts |
| 19 | Daniel Jr. Hennessey | 19 | Son | — | Massachusetts |
| 20 | William Hennessey | 17 | Son | Laborer | Massachusetts |
| 21 | Joseph Hennessey | 15 | Son | — | Massachusetts |
| 22 | Paul Hennessey | 13 | Son | — | Massachusetts |
| 23 | Stephen Demetri | 62 | Head | Proprietor | Albania |
| 24 | Nake Demetri | 52 | Wife | — | Albania |
| 25 | Charles O'Connor | 30 | Head | Laborer | Massachusetts |
| 26 | Anna E. O'Connor | 27 | Wife | — | Canada |
| 27 | Eugene O'Connor | 4 | Son | — | Massachusetts |
| 28 | Catherine O'Connor | 3 | Daughter | — | Massachusetts |
| 29 | Charles O'Connor | 1 | Son | — | Massachusetts |
| 30 | Anthony Dimitto | 55 | Head | Packer | Italy |
| 31 | Civita Dimitto | 44 | Wife | — | Italy |
| 32 | Margaret Dimitto | 27 | Daughter | Stitcher | Massachusetts |
| 33 | Vincent Dimitto | 22 | Son | Presser | Massachusetts |
| 34 | Angelo Dimitto | 18 | Son | — | Massachusetts |
| 35 | Daniel Dimitto | 16 | Son | — | Massachusetts |
| 36 | Mary Dimitto | 15 | Daughter | — | Massachusetts |
| 37 | Doris Dimitto | 12 | Daughter | — | Massachusetts |
| 38 | Flora Dimitto | 8 | Daughter | — | Massachusetts |
| 39 | Raymond Dimitto | 5 | Son | — | Massachusetts |
| 40 | Agatha Dimitto | 3 | Daughter | — | 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)