JD
James Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Montgomery-County, Ohio
Our Model Tree links this James Duffy across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Ohio (XGBoost, ~Confirmed), with identified parents Margaret & James — first a head (b.~1906), then head of a 10-person household.
Age 34
b. ~1906
Male
Head
Born: Ohio
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Ohio |
| Surname | Duffy |
| Given Name | James P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Dayton City |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Postal Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Postal Clerk |
| Township / Ward | Dayton City |
| Est. Birth Year | ~1906 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Sharon Duffy | Daughter | — | 1 | ~1939 |
| Patricia Duffy | Daughter | — | 12 | ~1928 |
| Mary Duffy | Daughter | — | 8 | ~1932 |
| Marilyn Duffy | Daughter | — | 2 | ~1938 |
| James Duffy | Head | — | 34 | ~1906 |
| Helena Ellerman | Other | — | 76 | ~1864 |
| James Duffy | Son | — | 10 | ~1930 |
| Michael Duffy | Son | — | 3 | ~1937 |
| John Duffy | Son | — | 7 | ~1933 |
| Cecelia Duffy | Spouse | — | 35 | ~1905 |
Census Appearances
1920
Montgomery, Ohio
Son, age 14
Montgomery, Ohio · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Montgomery, Ohio
Son, age 25
Montgomery, Ohio · implied b. ~1905 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Clerk |
| Industry | Grocery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Montgomery-County, Ohio
Head, age 34
Montgomery-County, Ohio · implied b. ~1906 — 10 household members
| Surname | Duffy |
| Given Name | James P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Dayton City |
| 1935 Residence (County) | Montgomery |
| Occupation | Postal Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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: mother Margaret Duffy (~0.92 confidence) and father James Duffy (~0.92 confidence) and father James Duffy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Margaret Duffy
b. ~1871
Source mother
● Household
· direct · ~0.92
Father
James Duffy
b. ~1872
Source father
● Household
· direct · ~0.92
Father
James Duffy
b. ~1873
Source father
● Household
· direct · ~0.92
This person
Anchor record
James Duffy
Head · 1940 · age 34 · b. ~1906 · Ohio
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Ohio
Open full size
1940 US Federal Census — Montgomery-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03253-00155)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jay Wm. Holmes | 48 | Head | Principal | Ohio |
| 2 | Katherine D. Holmes | 45 | Wife | — | Indiana |
| 3 | Mary Ivey | 70 | Mother-in-law | — | Canada English |
| 4 | Matilda Cape | 64 | Maid | Housekeeper | Germany |
| 5 | John M. Strauser | 64 | Head | Canvasser | Indiana |
| 6 | Ada Strauser | 60 | Wife | — | Ohio |
| 7 | George Strauser | 11 | Son | — | Ohio |
| 8 | Mary Strauser | 60 | Sister | — | Ohio |
| 9 | Edward Lucas | 34 | Head | Abstractor Of Titles | Ohio |
| 10 | Virginia B. Lucas | 35 | Wife | — | Ohio |
| 11 | Chauncey Lowrey | 34 | Head | Material Clerk | Connecticut |
| 12 | Margretta Lowrey | 25 | Wife | File Clerk | Ohio |
| 13 | Leonor Minter | 48 | Mother-in-law | — | Ohio |
| 14 | Lee Nolte Minter | 13 | Sister-in-law | — | Ohio |
| 15 | Phoebe Beckham | 78 | Mother | — | Ohio |
| 16 | James D. Clancey | 47 | Head | Tool Inspector | Ohio |
| 17 | Sabrina Clancey | 46 | Wife | — | Ohio |
| 18 | Virginia Clancey | 22 | Daughter | Key Assembler | Ohio |
| 19 | Grace Clancey | 20 | Daughter | Typist | Ohio |
| 20 | John L. Russell | 36 | Head | Paint Chemist | Ohio |
| 21 | Florence Russell | 36 | Wife | — | Ohio |
| 22 | John L. Russell | 6 | Son | — | Ohio |
| 23 | Richard Russell | 4 | Son | — | Ohio |
| 24 | Robert Wellmeier | 15 | Lodger | — | Ohio |
| 25 | Earl E. French | 34 | Head | Assistant Foreman | Indiana |
| 26 | Janet E. French | 31 | Wife | — | Ohio |
| 27 | John E. French | 5 | Son | — | Ohio |
| 28 | James P. Duffy THIS PERSON | 34 | Head | Postal Clerk | Ohio |
| 29 | Cecelia Duffy | 35 | Wife | — | Ohio |
| 30 | Patricia Ann Duffy | 12 | Daughter | — | Ohio |
| 31 | James Jr. Duffy | 10 | Son | — | Ohio |
| 32 | Mary A. Duffy | 8 | Daughter | — | Ohio |
| 33 | John T. Duffy | 7 | Son | — | Ohio |
| 34 | Michael Duffy | 3 | Son | — | Ohio |
| 35 | Marilyn Duffy | 2 | Daughter | — | Ohio |
| 36 | Sharon Duffy | 1 | Daughter | — | Ohio |
| 37 | Helena Ellerman | 76 | Mother-in-law | — | Germany |
| 38 | — | None | — | — | — |
| 39 | J. Sidney Jr. Mckee | 42 | Head | Audit Manager | Ohio |
| 40 | Agnes Mckee | 37 | Wife | Stenographer | Ohio |
Pedigree Summary
James
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)