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Mary Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this Mary Mcgrath across the 1920, 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed), with identified parents James & Sarah — first a daughter (b.~1903), then head of a 6-person household.
Age 37
b. ~1903
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Additional Details | |
| Occupation | librarian |
| Industry | public library |
| Class of Worker | GW |
| Hours Worked | 41 |
| Income (1939) | 1100 |
| Highest Grade | C-1 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Librarian |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1903 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 37 | ~1903 |
| James Mcgrath | Head | — | 68 | ~1872 |
| Janet Kelly | Other | — | 54 | ~1886 |
| John Mcgrath | Son | — | 42 | ~1898 |
| Hubert Mcgrath | Son | — | 35 | ~1905 |
| Thomas Mcgrath | Son | — | 39 | ~1901 |
Census Appearances
1920
Worcester, Massachusetts
Daughter, age 17
Worcester, Massachusetts · implied b. ~1903 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Librarian |
| Industry | City of Worc |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Worcester, Massachusetts
Daughter, age 27
Worcester, Massachusetts · implied b. ~1903 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Librarian |
| Industry | Public Library |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Worcester-County, Massachusetts
Daughter, age 37
Worcester-County, Massachusetts · implied b. ~1903 — 6 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Occupation | librarian |
| Industry | public library |
| Class of Worker | GW |
| Hours Worked | 41 |
| Income (1939) | 1100 |
| Highest Grade | C-1 |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mcgrath (~0.92 confidence) and mother Sarah Mcgrath (~0.92 confidence) and father Henry Mcgrath (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mcgrath
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Sarah Mcgrath
b. ~1875
Source mother
● Household
· direct · ~0.92
Father
Henry Mcgrath
b. ~1879
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcgrath
Daughter · 1940 · age 37 · b. ~1903 · Massachusetts
★ You are viewing this record
Sibling
John Mcgrath
Sibling · 1940 · age 42
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcgrath
Sibling · 1940 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hubert Mcgrath
Sibling · 1940 · age 35
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 — Worcester-County, Massachusetts
Open full size
1940 US Federal Census — Worcester-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01715-00565)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna Schalansky | 21 | wife | Finisher | Massachusetts |
| 42 | Michael J. Walsh | 40 | head | Janitor | Massachusetts |
| 43 | Helen Walsh | 34 | wife | — | Massachusetts |
| 44 | Elizabeth Walsh | 5 | daughter | — | Massachusetts |
| 45 | Joanne Walsh | 1 | daughter | — | Massachusetts |
| 46 | Nanna Lyons | 73 | mother-in-law | — | Ireland |
| 47 | Michael Moriarty | 57 | lodger | — | South Ireland |
| 48 | John Lyons | 43 | brother-in-law | Fireman | Massachusetts |
| 49 | Loretta Lyons | 38 | sister-in-law | Stitcher | Massachusetts |
| 50 | Joseph Farr | 44 | head | Salesman | England |
| 51 | Margaret Farr | 42 | wife | — | Massachusetts |
| 52 | Joseph Farr | 11 | son | — | Massachusetts |
| 53 | John Farr | 8 | son | — | Massachusetts |
| 54 | James J. Mcgrath | 68 | head | Foreman | South Ireland |
| 55 | John F. Mcgrath | 42 | son | Lawyer | Massachusetts |
| 56 | Thomas Mcgrath | 39 | son | Teacher | Massachusetts |
| 57 | Hubert Mcgrath | 35 | son | Examiner | Massachusetts |
| 58 | Mary Mcgrath THIS PERSON | 37 | daughter | Librarian | Massachusetts |
| 59 | Janet Kelly | 54 | sister-in-law | — | South Ireland |
| 60 | Minnie Birkeland | 52 | head | Manager | Massachusetts |
| 61 | Teresa Burns | 39 | sister | — | Massachusetts |
| 62 | Nellie Newton | 40 | sister | Salesgirl | Massachusetts |
| 63 | Mary O. Lyons | 62 | head | — | South Ireland |
| 64 | Anna Lyons | 25 | daughter | Stenographer | Massachusetts |
| 65 | Francis O. Kessler | 72 | head | — | Lithuania |
| 66 | Annie Kessler | 70 | wife | — | Lithuania |
| 67 | Jacob Rosenfeld | 43 | head | Manager | Russia |
| 68 | Matilda Rosenfeld | 42 | wife | — | New York |
| 69 | Arthur Rosenfeld | 20 | son | Laborer | Massachusetts |
| 70 | Rhoda Rosenfeld | 9 | daughter | — | Massachusetts |
| 71 | Arline Rosenfeld | 6 | daughter | — | Massachusetts |
| 72 | Walter Pawlowskas | 51 | head | Millwright | Lithuania |
| 73 | Helen Pawlowskas | 48 | wife | — | Lithuania |
| 74 | John Pawlowskas | 30 | son | Painter | Connecticut |
| 75 | Francis Pawlowskas | 27 | son | Furnace Man | Connecticut |
| 76 | Charles Pawlowskas | 25 | son | Presser | Connecticut |
| 77 | Mary Pawlowskas | 21 | daughter | Presser | Massachusetts |
| 78 | Peter Milus | 45 | head | Sprayer | Lithuania |
| 79 | Amelia Milus | 43 | wife | — | Massachusetts |
| 80 | Virginia Milus | 19 | daughter | — | Massachusetts |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)