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Mary Mcgrath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Mcgrath across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 10-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Boston WPA Headquarters |
| Class of Worker | GW |
| Hours Worked | 26 |
| Income (1939) | 150 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Stenographer |
| Township / Ward | Boston City |
| Est. Birth Year | ~1921 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eleanor Mcgrath | Daughter | — | 13 | ~1927 |
| Theresa Mcgrath | Daughter | — | 5 | ~1935 |
| Mary Mcgrath | Daughter | — | 19 | ~1921 |
| Patricia Mcgrath | Daughter | — | 9 | ~1931 |
| Thomas Mcgrath | Head | — | 41 | ~1899 |
| Lawrence Mcgrath | Son | — | 11 | ~1929 |
| William Mcgrath | Son | — | 7 | ~1933 |
| Thomas Mcgrath | Son | — | 17 | ~1923 |
| Richard Mcgrath | Son | — | 15 | ~1925 |
| Ellen Mcgrath | Spouse | — | 42 | ~1898 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Free State |
| Mother's Birthplace | Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 19
Suffolk-County, Massachusetts · implied b. ~1921 — 10 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Stenographer |
| Industry | Boston WPA Headquarters |
| Class of Worker | GW |
| Hours Worked | 26 |
| Income (1939) | 150 |
| Highest Grade | Hs 4 |
| 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 Mcgrath across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcgrath
Daughter · 1940 · age 19 · b. ~1921 · Massachusetts
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Sibling
William Mcgrath
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Mcgrath
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Mcgrath
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcgrath
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Mcgrath
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Mcgrath
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mcgrath
Sibling · 1940 · age 9
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
40 people indexed on this census page (nara:1940:m-t0627-01682-00564)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Oliva | 58 | Wife | — | Italy |
| 2 | Victor Oliva | 34 | Son | Bookkeeper | Massachusetts |
| 3 | Thomas G. Mcgrath | 41 | Head | Shipper | Rhode Island |
| 4 | Ellen Mcgrath | 42 | Wife | — | Irish Free State |
| 5 | Mary Mcgrath THIS PERSON | 19 | Daughter | Stenographer | Massachusetts |
| 6 | Thomas Mcgrath | 17 | Son | — | Massachusetts |
| 7 | Richard Mcgrath | 15 | Son | — | Massachusetts |
| 8 | Eleanor Mcgrath | 13 | Daughter | — | Massachusetts |
| 9 | Lawrence Mcgrath | 11 | Son | — | Massachusetts |
| 10 | Patricia Mcgrath | 9 | Daughter | — | Massachusetts |
| 11 | William Mcgrath | 7 | Son | — | Massachusetts |
| 12 | Theresa Mcgrath | 5 | Daughter | — | Massachusetts |
| 13 | Charles Nixon | 55 | Head | Letter Carrier | Rhode Island |
| 14 | Mary Nixon | 46 | Wife | — | Massachusetts |
| 15 | Charles Nixon | 16 | Son | — | Massachusetts |
| 16 | Marion Nixon | 13 | Daughter | — | Massachusetts |
| 17 | Clare O'Donnell | 19 | Niece | Auditor | Massachusetts |
| 18 | Francis Mulcahy | 6 | Niece | — | Massachusetts |
| 19 | Frank Dewitt | 36 | Head | Stationary Engineer | Illinois |
| 20 | Norma Dewitt | 36 | Wife | Barber | Massachusetts |
| 21 | Frank Dewitt | 14 | Son | — | Massachusetts |
| 22 | Mario Cornigliano | 40 | Head | Hairdresser | Italy |
| 23 | Josephine Cornigliano | 41 | Wife | — | Italy |
| 24 | Mario Cornigliano | 12 | Son | — | Massachusetts |
| 25 | Richard Cornigliano | 11 | Son | — | Massachusetts |
| 26 | Dorothy Cornigliano | 7 | Daughter | — | Massachusetts |
| 27 | Raymond Cornigliano | 6 | Son | — | Massachusetts |
| 28 | Thomas Tilly | 53 | Head | Express Driver | Massachusetts |
| 29 | Minnie Tilly | 64 | Wife | — | New York |
| 30 | Mary Ryan | 66 | Head | — | Irish Free State |
| 31 | Thomas Ryan | 24 | Son | Mechanic | Massachusetts |
| 32 | Frank Hawkes | 29 | Head | Auditor | Massachusetts |
| 33 | Edith Hawkes | 29 | Wife | — | Massachusetts |
| 34 | Louise Best | 33 | Head | School Nurse | Canada-English |
| 35 | Ruth Best | 36 | Sister | — | Canada-English |
| 36 | Florence Donohue | 49 | Head | — | Massachusetts |
| 37 | Harvey Donohue | 27 | Son | Lawyer | Massachusetts |
| 38 | Joseph Donohue | 24 | Son | Accountant | Massachusetts |
| 39 | Eleanor Donohue | 23 | Daughter | Interior Decorator | Massachusetts |
| 40 | Clare Donohue | 15 | 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)