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John Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mcdermott across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 11-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | dispatcher |
| Industry | gas company |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Dispatcher |
| Township / Ward | Boston City |
| Est. Birth Year | ~1917 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bernice Mcdermott | Daughter | — | 22 | ~1918 |
| Jane Mcdermott | Daughter | — | 3 | ~1937 |
| Patrick Mcdermott | Head | — | 47 | ~1893 |
| Joseph Mcdermott | Son | — | 6 | ~1934 |
| Edward Mcdermott | Son | — | 3 | ~1937 |
| James Mcdermott | Son | — | 19 | ~1921 |
| Francis Mcdermott | Son | — | 10 | ~1930 |
| William Mcdermott | Son | — | 18 | ~1922 |
| Charles Mcdermott | Son | — | 16 | ~1924 |
| John Mcdermott | Son | — | 23 | ~1917 |
| Mary Mcdermott | Spouse | — | 40 | ~1900 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 13
Suffolk, Massachusetts · implied b. ~1917 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada English |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 23
Suffolk-County, Massachusetts · implied b. ~1917 — 11 household members
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | dispatcher |
| Industry | gas company |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 900 |
| Highest Grade | H 4 |
| 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 John Mcdermott across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Mcdermott
Son · 1940 · age 23 · b. ~1917 · Massachusetts
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Sibling
Jane Mcdermott
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Mcdermott
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcdermott
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcdermott
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Mcdermott
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcdermott
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcdermott
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcdermott
Sibling · 1940 · age 19
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-t0627-01682-00131)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Vincent Vitrie | 37 | Head | Baker | Italy |
| 2 | Louise Vitrie | 30 | Wife | Stripper | Massachusetts |
| 3 | Grace Vitrie | 7 | Daughter | — | Massachusetts |
| 4 | Frank B. Gowey | 34 | Head | Retail Grocer | Massachusetts |
| 5 | Frances Gowey | 34 | Wife | — | Massachusetts |
| 6 | Helene Gowey | 9 | Daughter | — | Massachusetts |
| 7 | Patrick Mcdermott | 47 | Head | Watchman | Irish Free State |
| 8 | Mary Mcdermott | 40 | Wife | — | Irish Free State |
| 9 | John Mcdermott THIS PERSON | 23 | Son | Dispatcher | Massachusetts |
| 10 | Bernice Mcdermott | 22 | Daughter | Salesman | Massachusetts |
| 11 | James Mcdermott | 19 | Son | Laborer | Massachusetts |
| 12 | William Mcdermott | 18 | Son | — | Massachusetts |
| 13 | Charles Mcdermott | 16 | Son | — | Massachusetts |
| 14 | Francis Mcdermott | 10 | Son | — | Massachusetts |
| 15 | Joseph Mcdermott | 6 | Son | — | Massachusetts |
| 16 | Edward Mcdermott | 3 | Son | — | Massachusetts |
| 17 | Jane Mcdermott | 3 | Daughter | — | Massachusetts |
| 18 | Michael F. Egan | 73 | Head | — | Irish Free State |
| 19 | Bridgid Egan | 70 | Wife | — | Irish Free State |
| 20 | William Egan | 37 | Son | Chauffeur | Massachusetts |
| 21 | Sara Egan | 35 | Daughter | — | Massachusetts |
| 22 | Mary Egan | 33 | Daughter | Operator | Massachusetts |
| 23 | James Egan | 31 | Son | Cleaner | Massachusetts |
| 24 | John Eranberry | 40 | Lodger | Clerk | Irish Free State |
| 25 | David J. Ahern | 66 | Head | Longshoreman | Irish Free State |
| 26 | Ellen Ahern | 65 | Wife | — | Irish Free State |
| 27 | John P. Ahern | 34 | Son | Salesman | Massachusetts |
| 28 | David Ahern | 30 | Son | Salesman | Massachusetts |
| 29 | Maurice Ahern | 28 | Son | Laboratory | Massachusetts |
| 30 | Alice Ahern | 24 | Daughter | — | Massachusetts |
| 31 | William Ahern | 22 | Son | Chauffeur | Massachusetts |
| 32 | Frances Ahern | 20 | Daughter | Salesgirl | Massachusetts |
| 33 | John Creigan | 48 | Head | Operator | Irish Free State |
| 34 | Margaret Creigan | 44 | Wife | — | Irish Free State |
| 35 | Rose Creigan | 20 | Daughter | New Worker | Massachusetts |
| 36 | Nora A. Creigan | 18 | Daughter | Domestic | Massachusetts |
| 37 | John Creigan | 18 | Son | — | Massachusetts |
| 38 | Winifred Creigan | 15 | Daughter | — | Massachusetts |
| 39 | Catherine Creigan | 16 | Daughter | — | Massachusetts |
| 40 | James Creigan | 14 | Son | — | 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)