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Mary Leary — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Leary across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1907), then head of a 13-person household.
Age 33
b. ~1907
Female
Daughter
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Leary |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | East Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Comptometer Operator |
| Industry | Soap Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 936 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Comptometer Operator |
| Township / Ward | East Boston City |
| Est. Birth Year | ~1907 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Driscoll | Head | — | 59 | ~1881 |
| John Leary | Other | — | 11 | ~1929 |
| Mary Leary | Daughter | — | 33 | ~1907 |
| Patricia Leary | Other | — | 2 | ~1938 |
| Patricia Driscoll | Other | — | 4 | ~1936 |
| John Driscoll | Son | — | 31 | ~1909 |
| James Driscoll | Son | — | 16 | ~1924 |
| John Driscoll | Other | — | 6 | ~1934 |
| Geraldine Leary | Other | — | 3 | ~1937 |
| Marguerite Driscoll | Daughter | — | 22 | ~1918 |
| Arthur Driscoll | Son | — | 24 | ~1916 |
| Leonard Driscoll | Son | — | 26 | ~1914 |
| Florence Driscoll | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 22
Suffolk, Massachusetts · implied b. ~1908 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leary |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 21 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 33
Suffolk-County, Massachusetts · implied b. ~1907 — 13 household members
| Surname | Leary |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | East Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Comptometer Operator |
| Industry | Soap Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 936 |
| Highest Grade | Hs 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 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 33 · b. ~1907 · Massachusetts
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Sibling
Marguerite Driscoll
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Driscoll
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Driscoll
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Driscoll
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Driscoll
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Driscoll
Sibling · 1940 · age 26
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
35 people indexed on this census page (nara:1940:m-t0627-01657-00081)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marjorie Caruso | 13 | daughter | — | Massachusetts |
| 2 | David M. Magee | 52 | Head | Yardman | Maine |
| 3 | Margaret M. Magee | 41 | wife | — | Massachusetts |
| 4 | Louis Fanello | 32 | Head | Maintenance Worker | Massachusetts |
| 5 | Pauline Fanello | 31 | wife | — | Massachusetts |
| 6 | Louis Jr. Fanello | 2 | son | — | Massachusetts |
| 7 | David Fanello | 0 | son | — | Massachusetts |
| 8 | Robert Mclean | 9 | adopted son | — | Massachusetts |
| 10 | Louis D. Martell | 70 | Head | — | Canada-French |
| 11 | Annie H. Martell | 66 | wife | — | Canada-French |
| 12 | Harold Boudreau | 26 | nephew | Shipper | New York |
| 13 | Alice Muise | 43 | niece | — | Canada-French |
| 14 | Alice Muise | 21 | daughter | Clerk | Canada-French |
| 15 | Muriel Muise | 20 | daughter | Nurse-Maid | Massachusetts |
| 16 | Francis Muise | 9 | son | — | Massachusetts |
| 17 | Margaret Driscoll | 59 | Head | — | Massachusetts |
| 18 | Leonard Driscoll | 26 | son | Salesman | Massachusetts |
| 19 | Arthur A. Driscoll | 24 | son | Clerk | Massachusetts |
| 20 | Marguerite Driscoll | 22 | daughter | Telephone Operator | Massachusetts |
| 21 | Florence Driscoll | 20 | daughter | New Worker | Massachusetts |
| 22 | James Driscoll | 16 | son | — | Massachusetts |
| 23 | John J. Sr. Driscoll | 31 | son | Chauffeur | Massachusetts |
| 24 | John J. Jr. Driscoll | 6 | grandson | — | Massachusetts |
| 25 | Patricia A. Driscoll | 4 | granddaughter | — | Massachusetts |
| 26 | Mary Leary THIS PERSON | 33 | daughter | Comptometer Operator | Massachusetts |
| 27 | John J. Leary | 11 | grandson | — | Massachusetts |
| 28 | Geraldine Leary | 3 | granddaughter | — | Massachusetts |
| 29 | Patricia Leary | 2 | granddaughter | — | Massachusetts |
| 30 | Frank J. Johnson | 66 | Head | Foreman | Massachusetts |
| 31 | Mary A. Johnson | 64 | wife | — | Massachusetts |
| 32 | Patsy Caruso | 44 | Head | Farmer | Italy |
| 33 | Rose Caruso | 38 | wife | — | New York |
| 34 | Esther Caruso | 21 | daughter | Clerk | Massachusetts |
| 35 | Thomas Caruso | 18 | son | Farmer | Massachusetts |
| 36 | Peter Caruso | 17 | son | — | 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)