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Mary Leary — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Leary across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 11-person household.
Age 14
b. ~1926
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Leary |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Watertown |
| 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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Leary | Daughter | — | 16 | ~1924 |
| Jean Leary | Daughter | — | 6 | ~1934 |
| Margaret Leary | Spouse | — | 50 | ~1890 |
| Paul Leary | Son | — | 20 | ~1920 |
| Robert Leary | Son | — | 8 | ~1932 |
| James Leary | Son | — | 21 | ~1919 |
| Joseph Leary | Son | — | 17 | ~1923 |
| Mary Leary | Daughter | — | 14 | ~1926 |
| James Leary | Head | — | 51 | ~1889 |
| Albert Leary | Son | — | 13 | ~1927 |
| Leo Leary | Son | — | 10 | ~1930 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 4
Middlesex, Massachusetts · implied b. ~1926 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | Mary B |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 14
Middlesex-County, Massachusetts · implied b. ~1926 — 11 household members
| Surname | Leary |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Watertown |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 8 |
| 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 Leary across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leary
Daughter · 1940 · age 14 · b. ~1926 · Massachusetts
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Sibling
Paul Leary
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Leary
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Leary
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Leary
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Leary
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Leary
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Leary
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Leary
Sibling · 1940 · age 13
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-t0627-01620-00134)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marion V. Riley | 63 | Head | — | Canada French |
| 2 | Hulda Conick | 38 | Lodger | Baker | Canada English |
| 3 | William Lynch | 45 | Head | Mechanic | Massachusetts |
| 4 | Mary E. Lynch | 35 | Wife | — | Massachusetts |
| 5 | William Lynch | 9 | Son | — | Massachusetts |
| 6 | Helen D. Walsh | 65 | Head | Clerk | Massachusetts |
| 7 | Mary M. Walsh | 35 | Daughter | Shipper | Massachusetts |
| 8 | Louis M. Walsh | 35 | Son | Admitting Clerk | Massachusetts |
| 9 | Alice J. Walsh | 31 | Daughter | — | Massachusetts |
| 10 | Ann M. Walsh | 29 | Daughter | Comptometer Operator | Massachusetts |
| 11 | Lucy J. Walsh | 25 | Daughter | Custodian | Massachusetts |
| 12 | Cyril Doxer | 35 | Head | — | Canada English |
| 13 | Alice A. Doxer | 35 | Wife | — | Canada English |
| 14 | Phyllis Doxer | 13 | Daughter | — | Massachusetts |
| 15 | Joan Doxer | 4 | Daughter | — | Massachusetts |
| 16 | Miles M. Mcphail | 55 | Head | Jeweler | Scotland |
| 17 | Mary M. Mcphail | 29 | Wife | — | Massachusetts |
| 18 | Mary Lou Mcphail | 5 | Daughter | — | Massachusetts |
| 19 | Donald M. Mcphail | 4 | Son | — | Massachusetts |
| 20 | Audrey L. Mcphail | 1 | Daughter | — | Massachusetts |
| 21 | Charles E. O'Dea | 52 | Head | Buyer | Massachusetts |
| 22 | Ida O'Dea | 52 | Wife | — | Massachusetts |
| 23 | Marie O'Dea | 21 | Daughter | Stenographer | Massachusetts |
| 24 | David O'Dea | 18 | Son | — | Massachusetts |
| 25 | Charles O'Dea | 16 | Son | — | Massachusetts |
| 26 | James E. Leary | 51 | Head | Salesman | Massachusetts |
| 27 | Margaret A. Leary | 50 | Wife | — | Massachusetts |
| 28 | James Leary | 21 | Son | Cutter | Massachusetts |
| 29 | Paul F. Leary | 20 | Son | Receiver | Massachusetts |
| 30 | Joseph A. Leary | 17 | Son | Helper | Massachusetts |
| 31 | Margaret A. Leary | 16 | Daughter | — | Massachusetts |
| 32 | Mary B. Leary THIS PERSON | 14 | Daughter | — | Massachusetts |
| 33 | Albert B. Leary | 13 | Son | — | Massachusetts |
| 34 | Leo H. Leary | 10 | Son | — | Massachusetts |
| 35 | Robert L. Leary | 8 | Son | — | Massachusetts |
| 36 | Jean E. Leary | 6 | Daughter | — | Massachusetts |
| 37 | Percy Ingham | 57 | Head | Watchman | England |
| 38 | Lena Ingham | 58 | Wife | — | Rhode Island |
| 39 | Lawrence A. Ingham | 31 | Son | Caretaker | Massachusetts |
| 40 | Paul Ingham | 23 | Son | Salesman | 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)