WM
William Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Mcdermott across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 6-person household.
Age 25
b. ~1915
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Cambridge |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Clerk |
| Industry | Steamship grain pier |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1000 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | City Of Cambridge |
| Est. Birth Year | ~1915 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Agnes Mcdermott | Spouse | — | 60 | ~1880 |
| William Mcdermott | Son | — | 25 | ~1915 |
| Daniel Mcdermott | Son | — | 20 | ~1920 |
| William Mcdermott | Head | — | 61 | ~1879 |
| Agnes Mcdermott | Daughter | — | 28 | ~1912 |
| Francis Mcdermott | Son | — | 23 | ~1917 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 14
Middlesex, Massachusetts · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada-French |
| Mother's Birthplace | Canada-French |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 6 household members
| Surname | McDermott |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Cambridge |
| 1935 Residence (County) | Middlesex |
| Occupation | Clerk |
| Industry | Steamship grain pier |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1000 |
| 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 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 25 · b. ~1915 · Massachusetts
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Sibling
Daniel Mcdermott
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Mcdermott
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcdermott
Sibling · 1940 · age 23
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
29 people indexed on this census page (nara:1940:m-t0627-01683-00040)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sam Fama | 42 | Head | Line-Man | Nova Scotia |
| 42 | Anthony Demilla | 52 | Head | Laborer | Italy |
| 43 | Jenny Demilla | 48 | Wife | — | Italy |
| 44 | Freda Demilla | 22 | Daughter | New Worker | Canada-French |
| 45 | Daniel Demilla | 18 | Son | New Worker | Canada-French |
| 46 | Emma Demilla | 16 | Daughter | — | Massachusetts |
| 47 | Ostia Demilla | 14 | Daughter | — | Massachusetts |
| 48 | Francis Demilla | 12 | Son | — | Massachusetts |
| 49 | Elinora Demilla | 10 | Daughter | — | Massachusetts |
| 50 | Eva Scamper | 52 | Head | — | Italy |
| 51 | Joseph Scamper | 22 | Son | Sculpturer | Massachusetts |
| 52 | Joseph La Scala | 56 | Head | Cement Finisher | Italy |
| 53 | Josephine La Scala | 46 | Wife | — | Italy |
| 54 | Josephine La Scala | 25 | Daughter | Cleaner | Massachusetts |
| 55 | John La Scala | 23 | Son | Salesman | Massachusetts |
| 56 | Elizabeth La Scala | 26 | Daughter-in-law | — | Massachusetts |
| 57 | Geraldine La Scala | 0 | Granddaughter | — | Massachusetts |
| 58 | William Mcdermott | 61 | Head | Watchman | Eire |
| 59 | Agnes Mcdermott | 60 | Wife | — | Eire |
| 60 | Agnes Mcdermott | 28 | Daughter | Clerk | Massachusetts |
| 61 | William Mcdermott THIS PERSON | 25 | Son | Clerk | Massachusetts |
| 62 | Francis Mcdermott | 23 | Son | Bookkeeper | Massachusetts |
| 63 | Daniel Mcdermott | 20 | Son | Carpenter | Massachusetts |
| 64 | Anthony Rubbico | 27 | Head | Police Officer | Massachusetts |
| 65 | Frances Rubbico | 26 | Wife | — | Maine |
| 66 | Patricia Rubbico | 1 | Daughter | — | Massachusetts |
| 67 | Vito Cucchetti | 61 | Head | Barber | Italy |
| 68 | Mary Cucchetti | 61 | Wife | — | Italy |
| 69 | James Cucchetti | 26 | Son | Salesman | Massachusetts |
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)