WM
William Mcgrath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Mcgrath across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 10-person household.
Age 21
b. ~1919
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McGrath |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | C.C.C. project |
| Industry | GW |
| Class of Worker | 400 |
| Highest Grade | Hs 4 |
| 1935 Residence | 40 |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | C.C.C. Project |
| Township / Ward | Boston City |
| Est. Birth Year | ~1919 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Martha Mcgrath | Daughter | — | 23 | ~1917 |
| Margaret Mcgrath | Spouse | — | 47 | ~1893 |
| William Mcgrath | Head | — | 47 | ~1893 |
| Leo Mcgrath | Son | — | 20 | ~1920 |
| Edward Mcgrath | Son | — | 18 | ~1922 |
| William Mcgrath | Son | — | 21 | ~1919 |
| Marie Mcgrath | Daughter | — | 11 | ~1929 |
| Phyllis Mcgrath | Daughter | — | 15 | ~1925 |
| Paul Mcgrath | Son | — | 14 | ~1926 |
| John Mcgrath | Son | — | 24 | ~1916 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 11
Suffolk, Massachusetts · implied b. ~1919 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | William F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 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
Son, age 21
Suffolk-County, Massachusetts · implied b. ~1919 — 10 household members
| Surname | McGrath |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (County) | Suffolk |
| Occupation | C.C.C. project |
| Industry | GW |
| Class of Worker | 400 |
| Highest Grade | Hs 4 |
| 1935 Residence | 40 |
| 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 William Mcgrath across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcgrath
Son · 1940 · age 21 · b. ~1919 · Massachusetts
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Sibling
Edward Mcgrath
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phyllis Mcgrath
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcgrath
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Mcgrath
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Mcgrath
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Mcgrath
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Mcgrath
Sibling · 1940 · age 11
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-t0627-01667-00712)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Daniel Macmillan | 2 | Son | — | Massachusetts |
| 42 | Ewen Green | 60 | Head | Subway Project | Massachusetts |
| 43 | Daniel Davis | 82 | Head | — | Massachusetts |
| 44 | Louisa Davis | 81 | Wife | — | Rhode Island |
| 45 | James Haley | 30 | Head | Subway Project | Massachusetts |
| 46 | Lois Haley | 27 | Wife | — | Massachusetts |
| 47 | Lois Haley | 7 | Daughter | — | Massachusetts |
| 48 | Caroline Haley | 5 | Daughter | — | Massachusetts |
| 49 | Patricia Haley | 3 | Daughter | — | Massachusetts |
| 50 | Mary Haley | 1 | Daughter | — | Massachusetts |
| 51 | Ray Hulbert | 46 | Head | — | New York |
| 52 | Josephine Hulbert | 54 | Wife | — | Massachusetts |
| 53 | Margaret Hartnet | 53 | Sister-in-law | Cloth | Massachusetts |
| 54 | John Alladay | 33 | Head | Optical | Indiana |
| 55 | Helen Alladay | 31 | Wife | — | Massachusetts |
| 56 | Helen Alladay | 10 | Daughter | — | Massachusetts |
| 57 | John Alladay | 8 | Son | — | Massachusetts |
| 58 | William Alladay | 5 | Son | — | Massachusetts |
| 59 | Mary Alladay | 4 | Daughter | — | Massachusetts |
| 60 | Louis Alladay | 3 | Daughter | — | Massachusetts |
| 61 | Mary Lamond | 86 | Head | 0 | Ireland |
| 62 | Catherine Lamond | 48 | Daughter | Private Family | Massachusetts |
| 63 | William Mcgrath | 47 | Head | Bindery | Massachusetts |
| 64 | Margaret Mcgrath | 47 | Wife | — | Massachusetts |
| 65 | John Mcgrath | 24 | Son | W.P.A. Administration Office | Massachusetts |
| 66 | Martha Mcgrath | 23 | Daughter | — | Massachusetts |
| 67 | William Mcgrath THIS PERSON | 21 | Son | C.C.C. Project | Massachusetts |
| 68 | Leo Mcgrath | 20 | Son | — | Massachusetts |
| 69 | Edward Mcgrath | 18 | Son | Hospital | Massachusetts |
| 70 | Phyllis Mcgrath | 15 | Daughter | — | Massachusetts |
| 71 | Paul Mcgrath | 14 | Son | — | Massachusetts |
| 72 | Marie Mcgrath | 11 | Daughter | — | Massachusetts |
| 73 | Harry Wind | 32 | Head | W.P.A. Hospital Project | Massachusetts |
| 74 | Minna Wind | 31 | Wife | — | Massachusetts |
| 75 | Donald Wind | 12 | Son | — | Massachusetts |
| 76 | Donald Collins | 45 | Lodger | 0 | Scotland |
| 77 | Alice Collins | 42 | Niece | 0 | Scotland |
| 78 | William Duffy | 75 | Head | Municipal Stable | Massachusetts |
| 79 | Mary Mcconley | 21 | Head | — | Massachusetts |
| 80 | Lillian Jones | 38 | Head | Private Home | Massachusetts |
Related Census Records
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)