MM
Mary Mcgrath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Mcgrath across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 4-person household.
Age 65
b. ~1875
Female
Head
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McGrath |
| Given Name | Mary A. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1875 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kane | Daughter | — | 25 | ~1915 |
| Margaret Kane | Daughter | — | 37 | ~1903 |
| Mary Mcgrath | Head | — | 65 | ~1875 |
| James Mcgrath | Son | — | 30 | ~1910 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 47
Middlesex, Massachusetts · implied b. ~1873 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Spouse, age 55
Middlesex, Massachusetts · implied b. ~1875 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| 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
Middlesex-County, Massachusetts
Head, age 65
Middlesex-County, Massachusetts · implied b. ~1875 — 4 household members
| Surname | McGrath |
| Given Name | Mary A. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 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 Mcgrath across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcgrath
Head · 1940 · age 65 · b. ~1875 · Massachusetts
★ You are viewing this record
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
38 people indexed on this census page (nara:1940:m-t0627-01604-00097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Mccarthy | 25 | Step daughter | Stenographer | Massachusetts |
| 2 | Francis Mccarthy | 21 | Step daughter | Sorter | Massachusetts |
| 3 | Michael Kane | 80 | Head | Laborer | Massachusetts |
| 4 | Katherine A. Kane | 70 | Wife | — | Massachusetts |
| 5 | Mary Kane | 17 | Daughter | New Worker | Massachusetts |
| 6 | Rita Kane | 17 | Daughter | — | Massachusetts |
| 7 | Bernadine Kane | 15 | Daughter | — | Massachusetts |
| 8 | Robert Kane | 14 | Son | — | Massachusetts |
| 9 | Patrick Kane | 12 | Son | — | Massachusetts |
| 10 | Frances Kane | 9 | Daughter | — | Massachusetts |
| 11 | Rose Kane | 7 | Daughter | — | Massachusetts |
| 12 | Archibald Christo | 35 | Head | Proprietor | Albania |
| 13 | Pauline Christo | 25 | Wife | — | Albania |
| 14 | Edward Christo | 1 | Son | — | Massachusetts |
| 15 | Leo Petroni | 32 | Head | Barber | Italy |
| 16 | Ida Petroni | 30 | Wife | — | Italy |
| 17 | Louis Petroni | 6 | Son | — | Massachusetts |
| 18 | Frank Petroni | 4 | Son | — | Massachusetts |
| 19 | Emile Petroni | 1 | Son | — | Massachusetts |
| 20 | Edna B. Goode | 53 | Head | — | Massachusetts |
| 21 | Madeline S. Goode | 31 | Daughter | Instructor Arts & Crafts | Massachusetts |
| 22 | Frank J. Rourke | 52 | Head | Mason | Massachusetts |
| 23 | Anna M. Rourke | 55 | Wife | Clerk | Massachusetts |
| 24 | Joseph Rourke | 18 | Son | New Worker | Massachusetts |
| 25 | Rita Rourke | 15 | Daughter | — | Massachusetts |
| 26 | Mary Rourke | 12 | Daughter | — | Massachusetts |
| 27 | Mary A. Mcgrath THIS PERSON | 65 | Head | — | Massachusetts |
| 28 | James Mcgrath | 30 | Son | Operator | Massachusetts |
| 29 | Margaret Kane | 37 | Daughter | Clerk | Massachusetts |
| 30 | Mary Kane | 25 | Daughter | Inspector | Massachusetts |
| 31 | Mary M. Crowe | 82 | Head | — | Newfoundland |
| 32 | Florence Crowe | 68 | Boarder | — | Maine |
| 33 | Elizabeth Eatough | 60 | Boarder | Waitress | Massachusetts |
| 34 | Annie Page | 54 | Head | — | Massachusetts |
| 35 | Warren F. Page | 29 | Son | Chauffeur | Massachusetts |
| 36 | Daniel Page | 24 | Son | Laborer | Massachusetts |
| 37 | John Minnechelli | 24 | Head | Rigger | Maine |
| 38 | Mary Minnechelli | 20 | Wife | Folder | Maine |
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)