MH
Mary Hennessey — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Essex, Massachusetts
Our Model Tree links this Mary Hennessey across the 1920 and 1930 US Censuses in Essex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1894), then head of a 12-person household.
Age 26
b. ~1894
Female
Daughter
Born: Massachusetts
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Essex, Massachusetts |
| Surname | Hennessey |
| Given Name | Mary M |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | clerk |
| Industry | government |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Lynn City |
| Est. Birth Year | ~1894 |
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.
12 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Gertrude Hennessey | Daughter | — | 17 | ~1903 |
| John Hennessey | Head | — | 54 | ~1866 |
| Mabel Hennessey | Daughter | — | 14 | ~1906 |
| Dorothy Hennessey | Daughter | — | 6 | ~1914 |
| Richard Hennessey | Son | — | 29 | ~1891 |
| Mary Hennessey | Spouse | — | 49 | ~1871 |
| Leo Hennessey | Son | — | 9 | ~1911 |
| Mary Hennessey | Daughter | — | 26 | ~1894 |
| Thomas Hennessey | Son | — | 20 | ~1900 |
| William Hennessey | Son | — | 25 | ~1895 |
| George Hennessey | Son | — | 23 | ~1897 |
| Florence Hennessey | Daughter | — | 12 | ~1908 |
Census Appearances
1920
Essex, Massachusetts
Daughter, age 26
Essex, Massachusetts · implied b. ~1894 — 12 household members
| Surname | Hennessey |
| Given Name | Mary M |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | clerk |
| Industry | government |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, Massachusetts
Daughter, age 36
Essex, Massachusetts · implied b. ~1894 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Mary M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Vermont |
| Occupation | Teacher |
| Industry | Eleme School |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 (1920 and 1930) in Essex, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hennessey
Daughter · 1920 · age 26 · b. ~1894 · Massachusetts
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Sibling
Florence Hennessey
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Hennessey
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Hennessey
Sibling · 1920 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Hennessey
Sibling · 1920 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Hennessey
Sibling · 1920 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mabel Hennessey
Sibling · 1920 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gertrude Hennessey
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Hennessey
Sibling · 1920 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Hennessey
Sibling · 1920 · age 25
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
1920 US Federal Census — Essex, Massachusetts
Open full size
1920 US Federal Census — Essex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu695unit:0129)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas B Trott | 74 | head | None | Maine |
| 2 | Elizabeth Trott | 65 | wife | None | Maine |
| 3 | Ernest E Trott | 25 | step son | Salesman | Maine |
| 4 | Peter Stewart | 52 | head | Shipper | England |
| 5 | Bessie Stewart | 42 | wife | None | Canada |
| 6 | Etta Stewart | 21 | daughter | Winding Field | Canada |
| 7 | Jennie Stewart | 17 | daughter | Electric Co | English |
| 8 | Patrick J Lynch | 58 | head | Laborer | Ireland |
| 9 | Katherine Lynch | 58 | wife | None | Ireland |
| 10 | John A Lynch | 27 | son | Jeweler | Massachusetts |
| 11 | James F Lynch | 25 | son | Coil Winder | Massachusetts |
| 12 | Katherine Lynch | 22 | daughter | Stenographer | Massachusetts |
| 13 | Irving Hapgood | 61 | head | Proprietor | Massachusetts |
| 14 | Annie M Hapgood | 57 | wife | None | Maine |
| 15 | Willard C Williams | 61 | head | Meter Assembler | Massachusetts |
| 16 | Carrie M Williams | 60 | wife | None | Massachusetts |
| 17 | Joseph B Wood | 76 | head | Laster | Massachusetts |
| 18 | Rose L Wood | 72 | wife | None | Massachusetts |
| 19 | Fred D Stone | 49 | head | Yard Master | Massachusetts |
| 20 | George H Stone | 15 | son | Teamster | Massachusetts |
| 21 | Minnie H Doucett | 47 | cousin | None | Massachusetts |
| 22 | John F Hennessey | 25 | head | Electrician | Massachusetts |
| 23 | Gladys Hennessey | 21 | wife | None | Massachusetts |
| 24 | William Hennessey | 2 | son | None | Massachusetts |
| 25 | Raymond Hennessey | 0 | son | None | Massachusetts |
| 26 | John Hennessey | 54 | head | Brass Polisher | Ireland |
| 27 | Mary A Hennessey | 49 | wife | None | Ireland |
| 28 | Richard P Hennessey | 29 | son | Meter Tester | Massachusetts |
| 29 | Mary M Hennessey THIS PERSON | 26 | daughter | Clerk | Massachusetts |
| 30 | William J Hennessey | 25 | son | Stenographer | Massachusetts |
| 31 | George E Hennessey | 23 | son | Shipper | Massachusetts |
| 32 | Thomas J Hennessey | 20 | son | Stenographer | Massachusetts |
| 33 | Gertrude T Hennessey | 17 | daughter | Clerk | Massachusetts |
| 34 | Mabel A Hennessey | 14 | daughter | None | Massachusetts |
| 35 | Florence E Hennessey | 12 | daughter | None | Massachusetts |
| 36 | Leo H Hennessey | 9 | son | None | Massachusetts |
| 37 | Dorothy L Hennessey | 6 | daughter | None | Massachusetts |
| 38 | George W Wood | 50 | head | Shipper | England |
| 39 | Mary Wood | 52 | wife | None | England |
| 40 | George Wood | 17 | son | Machinist | Massachusetts |
| 41 | Franklin W Presol | 46 | head | Sole Cutter | Massachusetts |
| 42 | Anna Presol | 40 | wife | None | Sweden |
| 43 | Ruby G Presol | 12 | step daughter | None | Massachusetts |
| 44 | Franklin W Presol | 5 | son | None | Massachusetts |
| 45 | Charles F Rice | 65 | head | Minister | Massachusetts |
| 46 | William C Rice | 41 | son | Lawyer | Massachusetts |
| 47 | Martha Mason | 57 | house keeper | House Keeper | Canada |
| 48 | Addie K Le Groh | 72 | head | None | Maine |
| 49 | Eleanor Le Groh | 37 | daughter | Bookkeeper | Massachusetts |
| 50 | Arthur Russell | 34 | head | Auto Man | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)