JD
James Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this James Duffy across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1914), then head of a 4-person household.
Age 26
b. ~1914
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Duffy |
| Given Name | James H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lynn City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Teacher |
| Industry | prep. school |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 1400 |
| Highest Grade | C-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Teacher |
| Township / Ward | Lynn City |
| Est. Birth Year | ~1914 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| V Duffy | Daughter | — | 29 | ~1911 |
| Winifred Duffy | Head | — | 63 | ~1877 |
| John Duffy | Son | — | 21 | ~1919 |
| James Duffy | Son | — | 26 | ~1914 |
Census Appearances
1920
Essex, Massachusetts
Son, age 5
Essex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, Massachusetts
Son, age 16
Essex, Massachusetts · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| 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
Essex-County, Massachusetts
Son, age 26
Essex-County, Massachusetts · implied b. ~1914 — 4 household members
| Surname | Duffy |
| Given Name | James H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lynn City |
| 1935 Residence (County) | Essex |
| Occupation | Teacher |
| Industry | prep. school |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 1400 |
| Highest Grade | C-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 James Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Duffy (~0.92 confidence) and father James Duffy (~0.92 confidence) and mother Winnefred Duffy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Duffy
b. ~1866
Source father
● Household
· direct · ~0.92
Father
James Duffy
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Winnefred Duffy
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Duffy
Son · 1940 · age 26 · b. ~1914 · Massachusetts
★ You are viewing this record
Sibling
V Duffy
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Duffy
Sibling · 1940 · age 21
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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
8 people indexed on this census page (nara:1940:m-t0627-01695-00866)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arthur Hollis | 45 | Head | Supervisor | Massachusetts |
| 2 | Irene O. Hollis | 42 | Wife | — | Massachusetts |
| 3 | Arlene Hollis | 13 | Daughter | — | Massachusetts |
| 4 | Arthur Jr. Hollis | 12 | Son | — | Massachusetts |
| 5 | Winifred A. Duffy | 63 | Head | — | Massachusetts |
| 6 | V. Margaret Duffy | 29 | Daughter | Teacher | Massachusetts |
| 7 | James H. Jr. Duffy THIS PERSON | 26 | Son | Teacher | Massachusetts |
| 8 | John H. Duffy | 21 | Son | — | Massachusetts |
Pedigree Summary
James + 2 siblings
Gen 1 · 3 parents
~0.92
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)