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John Duggan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Duggan across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Duggan |
| Given Name | John F Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Duggan | Son | — | 20 | ~1920 |
| Richard Duggan | Son | — | 13 | ~1927 |
| John Duggan | Head | — | 48 | ~1892 |
| Elizabeth Duggan | Daughter | — | 6 | ~1934 |
| Dennis Duggan | Son | — | 14 | ~1926 |
| Elizabeth Duggan | Spouse | — | 39 | ~1901 |
| James Duggan | Son | — | 21 | ~1919 |
| Julia Duggan | Daughter | — | 24 | ~1916 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 8
Middlesex, Massachusetts · implied b. ~1922 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duggan |
| Given Name | John F. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 20
Middlesex-County, Massachusetts · implied b. ~1920 — 8 household members
| Surname | Duggan |
| Given Name | John F Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 8 |
| 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 John Duggan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Duggan
Son · 1940 · age 20 · b. ~1920 · Massachusetts
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Sibling
Richard Duggan
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Duggan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duggan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Duggan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Duggan
Sibling · 1940 · age 6
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-t0627-01704-00222)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jennie D Montuori | 13 | Head | — | Massachusetts |
| 2 | Mary D Montuori | 8 | Daughter | — | Massachusetts |
| 3 | John De Gregorio | 51 | Head | Machine Operator | Italy |
| 4 | Maria De Gregorio | 47 | Wife | — | Italy |
| 5 | Albert De Gregorio | 19 | Son | Cleaning | Italy |
| 6 | Michelina De Gregorio | 10 | Daughter | — | Italy |
| 7 | Aloysius Mcdonough | 44 | Head | Chief Petty Officer | Connecticut |
| 8 | Margaret Mcdonough | 33 | Wife | — | Alabama |
| 9 | Gwendolyn Mcdonough | 15 | Daughter | — | Massachusetts |
| 10 | William Larkin | 43 | Head | Painter | Nova Scotia |
| 11 | Carrie Larkin | 40 | Wife | — | Nova Scotia |
| 12 | William Jr Larkin | 17 | Son | — | Massachusetts |
| 13 | Paul Larkin | 14 | Son | — | Massachusetts |
| 14 | Helen Larkin | 11 | Daughter | — | Massachusetts |
| 15 | Freeman Larkin | 70 | Cousin | — | Nova Scotia |
| 16 | Joseph Rogers | 29 | Head | Mechanic | Massachusetts |
| 17 | Marie Rogers | 24 | Wife | — | New Hampshire |
| 18 | Lorri R Rogers | 5 | Daughter | — | Massachusetts |
| 19 | Albert R Palmacci | 27 | Brother-in-law | Gilder | Massachusetts |
| 20 | Elmira Palmacci | 21 | Sister-in-law | — | Massachusetts |
| 21 | Albert J Palmacci | 1 | Nephew | — | Massachusetts |
| 22 | Robert A Palmacci | 0 | Nephew | — | Massachusetts |
| 23 | Asadoor Berberian | 50 | Head | Butcher | Armenia |
| 24 | Hazlie Berberian | 38 | Wife | — | Armenia |
| 25 | Alice Berberian | 13 | Son | — | Rhode Island |
| 26 | Anna Berberian | 11 | Daughter | — | Rhode Island |
| 27 | Archie Berberian | 9 | Son | — | Rhode Island |
| 28 | Malcolm Berberian | 6 | Son | — | Massachusetts |
| 29 | John F Duggan | 48 | Head | — | Massachusetts |
| 30 | Elizabeth Duggan | 39 | Wife | — | Massachusetts |
| 31 | Julia T Duggan | 24 | Daughter | General Work | Massachusetts |
| 32 | James T Duggan | 21 | Son | Slicer | Massachusetts |
| 33 | John F Jr Duggan THIS PERSON | 20 | Son | — | Massachusetts |
| 34 | Dennis J Duggan | 14 | Son | — | Massachusetts |
| 35 | Richard Duggan | 13 | Son | — | Massachusetts |
| 36 | Elizabeth A Duggan | 6 | Daughter | — | Massachusetts |
| 37 | Walter Burdett | 40 | Head | Chauffeur | Massachusetts |
| 38 | Alice M Burdett | 37 | Wife | — | Massachusetts |
| 39 | Barbara Burdett | 9 | Daughter | — | Massachusetts |
| 40 | Alice C Burdett | 8 | Daughter | — | 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)