WM
William Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Mcgrath across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents William & William — first a son (b.~1918), then head of a 7-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McGrath |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Salesman |
| Industry | Retail Shoe Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 900 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Salesman |
| Township / Ward | Malden City |
| Est. Birth Year | ~1918 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Thomas Guilfoyle | Other | — | 47 | ~1893 |
| William Mcgrath | Head | — | 43 | ~1897 |
| William Mcgrath | Son | — | 22 | ~1918 |
| Eliza Guilfoyle | Daughter | — | 22 | ~1918 |
| Ruth Mcgrath | Daughter | — | 17 | ~1923 |
| Mary Walsh | Other | — | 73 | ~1867 |
| Ella Mcgrath | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age
Middlesex, Massachusetts · implied b. ~1920 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 12
Middlesex, Massachusetts · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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
Middlesex-County, Massachusetts
Son, age 22
Middlesex-County, Massachusetts · implied b. ~1918 — 7 household members
| Surname | McGrath |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Occupation | Salesman |
| Industry | Retail Shoe Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 900 |
| 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 William Mcgrath across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Mcgrath (~0.92 confidence) and father William Mcgrath (~0.92 confidence) and father Hugh Mcgrath (~0.82 confidence) and mother Ella Mcgrath (~0.92 confidence) and mother Ida Mcgrath (~0.92 confidence). The pedigree spans 2 generations with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.9
Father
William Mcgrath
b. ~1897
Source father
● Household
· direct · ~0.92
Father
William Mcgrath
b. ~1898
Source father
● Household
· direct · ~0.92
Father
Hugh Mcgrath
b. ~1870
Source father>father
● Household
· direct · ~0.82
Mother
Ella Mcgrath
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Ida Mcgrath
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mcgrath
Son · 1940 · age 22 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
Eliza Guilfoyle
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Mcgrath
Sibling · 1940 · age 17
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01608-00556)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rose C. Cafarella | 48 | Wife | — | Italy |
| 42 | Rose M. Cafarella | 23 | Daughter | Saleswoman | Massachusetts |
| 43 | Marie F. Cafarella | 22 | Daughter | Saleswoman | Massachusetts |
| 44 | Joseph A. Cafarella | 18 | Son | Clerk | Massachusetts |
| 45 | Felix Cafarella | 13 | Son | — | Massachusetts |
| 46 | Rudolph Cafarella | 10 | Son | — | Massachusetts |
| 47 | Eleanor Cafarella | 7 | Daughter | — | Massachusetts |
| 48 | Patrick P. Grassia | 35 | Head | Police Officer | Massachusetts |
| 49 | Catherine E. Grassia | 29 | Wife | — | Massachusetts |
| 50 | M. Carolyn Grassia | 0 | Daughter | — | Massachusetts |
| 51 | Joseph D. Paino | 31 | Head | Manager | Massachusetts |
| 52 | Marie N. Paino | 27 | Wife | — | Massachusetts |
| 53 | Dominick N. Paino | 6 | Son | — | Massachusetts |
| 54 | Marlene M. Paino | 0 | Daughter | — | Massachusetts |
| 55 | Nunziata Paino | 75 | Head | — | Italy |
| 56 | Tony D. Paino | 52 | Son | Machine Operator | Italy |
| 57 | Fred E. Stanton | 29 | Head | Salesman | Massachusetts |
| 58 | Barbara C. Stanton | 27 | Wife | Office Clerk | Massachusetts |
| 59 | Fred Stanton | 5 | Son | — | Massachusetts |
| 60 | Ruth Stanton | 3 | Daughter | — | Massachusetts |
| 61 | Grace L. Robbins | 19 | Lodger | Private Family | Massachusetts |
| 62 | Bernard J. Mallon | 41 | Head | Fireman | Massachusetts |
| 63 | Pauline C. Mallon | 37 | Wife | — | New Hampshire |
| 64 | Robert L. Mallon | 17 | Son | — | Massachusetts |
| 65 | John B. Mallon | 15 | Son | — | Massachusetts |
| 66 | Patricia R. Mallon | 13 | Daughter | — | Massachusetts |
| 67 | Margaret Mallon | 10 | Daughter | — | Massachusetts |
| 68 | Richard J. Mallon | 7 | Son | — | Massachusetts |
| 69 | Mary Lou Mallon | 4 | Daughter | — | Massachusetts |
| 70 | James R. Everitt | 33 | Head | Paint Sprayer | Canada-English |
| 71 | Pearl M. Everitt | 29 | Wife | — | Canada-English |
| 72 | Robert D. Everitt | 9 | Son | — | Massachusetts |
| 73 | William J. Mcgrath | 43 | Head | Fireman | Massachusetts |
| 74 | Ella C. Mcgrath | 42 | Wife | — | Massachusetts |
| 75 | William J. Mcgrath THIS PERSON | 22 | Son | Salesman | Massachusetts |
| 76 | Ruth E. Mcgrath | 17 | Daughter | — | Massachusetts |
| 77 | Mary E. Walsh | 73 | Mother-in-law | — | Massachusetts |
| 78 | Thomas J. Guilfoyle | 47 | Boarder | Gasfitter | Massachusetts |
| 79 | Eliza M. Guilfoyle | 22 | Daughter | Saleswoman | Massachusetts |
| 80 | John F. Evans | 54 | Head | Operator | Massachusetts |
Pedigree Summary
William + 2 siblings
Gen 1 · 4 parents
~0.92
Gen 2 · 1 grandparents
~0.82
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)