WM
William Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Mcdermott across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 9-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | messenger |
| Industry | bank |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 600 |
| Highest Grade | H-4 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Messenger |
| Township / Ward | Boston |
| Est. Birth Year | ~1920 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Mcdermott | Son | — | 20 | ~1920 |
| Mary Mcdermott | Daughter | — | 19 | ~1921 |
| Walter Mcdermott | Head | — | 52 | ~1888 |
| Margaret Mcdermott | Spouse | — | 49 | ~1891 |
| Edward Mcdermott | Son | — | 12 | ~1928 |
| Elizabeth Mcdermott | Daughter | — | 21 | ~1919 |
| Margaret Mcdermott | Daughter | — | 26 | ~1914 |
| Margaret Reagan | Other | — | 85 | ~1855 |
| Walter Mcdermott | Son | — | 25 | ~1915 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 10
Suffolk, Massachusetts · implied b. ~1920 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 20
Suffolk-County, Massachusetts · implied b. ~1920 — 9 household members
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | messenger |
| Industry | bank |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 600 |
| Highest Grade | H-4 |
| 1935 Residence | Massachusetts |
| 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 Mcdermott across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcdermott
Son · 1940 · age 20 · b. ~1920 · Massachusetts
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Sibling
Margaret Mcdermott
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Mcdermott
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Mcdermott
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcdermott
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcdermott
Sibling · 1940 · age 12
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-t0627-01682-00047)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ann M. Mcdermott | 25 | Daughter | — | Massachusetts |
| 2 | William Mcdermott | 10 | Son | — | Massachusetts |
| 3 | George Hurley | 55 | Head | — | Canada-Eng |
| 4 | Gertrude Hurley | 57 | Wife | — | England |
| 5 | George Hurley | 38 | Son | Shipper | Massachusetts |
| 6 | Alfred Hurley | 36 | Son | Steam Fitter | Massachusetts |
| 7 | Mary Hurley | 13 | Granddaughter | — | Massachusetts |
| 8 | Arthur Hurley | 11 | Grandson | — | Massachusetts |
| 9 | Robert Hurley | 10 | Grandson | — | Massachusetts |
| 10 | Janice Hurley | 9 | Granddaughter | — | Massachusetts |
| 11 | Grace Ruig | 26 | Lodger | Machine Operator | Maine |
| 12 | George W. Crosper | 74 | Head | Paper Hanger | Canada-Eng |
| 13 | Martha E. Crosper | 52 | Wife | — | Canada-Eng |
| 14 | Dorothy Crosper | 22 | Daughter | Saleslady | Massachusetts |
| 15 | Walter J. Mcdermott | 52 | Head | Conductor | Massachusetts |
| 16 | Margaret E. Mcdermott | 49 | Wife | — | Massachusetts |
| 17 | Margaret Mcdermott | 26 | Daughter | Waitress | Massachusetts |
| 18 | Walter J. Jr. Mcdermott | 25 | Son | Manager | Massachusetts |
| 19 | Elizabeth Mcdermott | 21 | Daughter | — | Maine |
| 20 | Edward W. Mcdermott | 12 | Son | — | Massachusetts |
| 21 | Margaret Reagan | 85 | Mother-in-law | — | Massachusetts |
| 22 | William Mcdermott THIS PERSON | 20 | Son | Messenger | Massachusetts |
| 23 | Mary Mcdermott | 19 | Daughter | Clerk | Massachusetts |
| 24 | Marion Barlow | 32 | Head | Optician | Massachusetts |
| 25 | Joseph Barlow | 30 | Brother | Foreman | Massachusetts |
| 26 | Robert Barlow | 24 | Brother | — | Massachusetts |
| 27 | Louise Barlow | 20 | Sister | Clerical Work | Massachusetts |
| 28 | Louis Barlow | 17 | Brother | — | Massachusetts |
| 29 | Anne Barlow | 15 | Sister | — | Massachusetts |
| 30 | Lottie Payne | 33 | Maid | Maid | Canada-Eng |
| 31 | John Currie | 40 | Head | Shipper | Canada-Eng |
| 32 | Mary Currie | 40 | Wife | — | Canada-Eng |
| 33 | John Currie | 8 | Son | — | Massachusetts |
| 34 | Gerald Currie | 7 | Son | — | Massachusetts |
| 35 | Donald Currie | 2 | Son | — | Massachusetts |
| 36 | Nicholas Threst | 49 | Head | Baker | Turkey |
| 37 | Adela Threst | 49 | Wife | — | Turkey |
| 38 | Grace Threst | 10 | Daughter | — | Massachusetts |
| 39 | Dimitrios Threst | 7 | Son | — | Massachusetts |
| 40 | Charles L. Jakobini | 82 | Head | Barber | Syria |
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)