JD
John Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mahoning-County, Ohio
Our Model Tree links this John Dempsey across the 1920, 1930 and 1940 US Censuses in Mahoning-County, Ohio (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mahoning-County, Ohio |
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Youngstown |
| 1935 Residence (County) | Mahoning |
| Additional Details | |
| Occupation | Salesman |
| Industry | Shoe Store |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Salesman |
| Township / Ward | Youngstown |
| Est. Birth Year | ~1912 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bridget Dempsey | Spouse | — | 54 | ~1886 |
| Alice Dempsey | Daughter | — | 26 | ~1914 |
| John Dempsey | Son | — | 28 | ~1912 |
| Donald Dempsey | Son | — | 21 | ~1919 |
| James Dempsey | Head | — | 56 | ~1884 |
Census Appearances
1920
Mahoning, Ohio
Son, age 9
Mahoning, Ohio · implied b. ~1911 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Mahoning, Ohio
Son, age 19
Mahoning, Ohio · implied b. ~1911 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Salesman |
| Industry | Shoe store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Mahoning-County, Ohio
Son, age 28
Mahoning-County, Ohio · implied b. ~1912 — 5 household members
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Youngstown |
| 1935 Residence (County) | Mahoning |
| Occupation | Salesman |
| Industry | Shoe Store |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| 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 John Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Dempsey (~0.92 confidence) and father James Dempsey (~0.92 confidence) and father James Dempsey (~0.92 confidence) and mother Bridget Dempsey (~0.92 confidence) and mother Bridget Dempsey (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Dempsey
b. ~1877
Source father
● Household
· direct · ~0.92
Father
James Dempsey
b. ~1884
Source father
● Household
· direct · ~0.92
Father
James Dempsey
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Bridget Dempsey
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Bridget Dempsey
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Dempsey
Son · 1940 · age 28 · b. ~1912 · Ohio
★ You are viewing this record
Sibling
Alice Dempsey
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Dempsey
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 — Mahoning-County, Ohio
Open full size
1940 US Federal Census — Mahoning-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03268-00262)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Kula | 26 | Head | Pipe Fitter | Pennsylvania |
| 2 | Agnes Kula | 24 | Wife | — | Ohio |
| 3 | James Kula | 2 | Son | — | Ohio |
| 4 | Andrew Tomassino | 65 | Head | — | Italy |
| 5 | Nancy Tomassino | 51 | Wife | — | Italy |
| 6 | Dorothy Tomassino | 20 | Daughter | Cook | Ohio |
| 7 | Josephine Tomassino | 17 | Daughter | — | Ohio |
| 8 | Michael Scarpi | 30 | Head | Labor | Ohio |
| 9 | Mary Ann Scarpi | 26 | Wife | — | Ohio |
| 10 | James Dempsey | 56 | Head | Labor | Ireland |
| 11 | Bridget Dempsey | 54 | Wife | — | Ireland |
| 12 | John Dempsey THIS PERSON | 28 | Son | Salesman | Ohio |
| 13 | Alice Dempsey | 26 | Daughter | Sales Woman | Ohio |
| 14 | Donald Dempsey | 21 | Son | Salesman | Ohio |
| 15 | Thomas De Rose | 52 | Head | Tailor | Italy |
| 16 | Martha De Rose | 42 | Wife | — | Italy |
| 17 | John De Rose | 21 | Son | Label Machine Operator | Ohio |
| 18 | Rita May De Rose | 15 | Daughter | — | Ohio |
| 19 | Eleanor Barber | 27 | Sister-in-law | Clerical Work | Ohio |
| 20 | Torquato Palma | 55 | Head | Time Keeper | Italy |
| 21 | Connie Lucia Palma | 44 | Wife | Manager | Pennsylvania |
| 22 | Katherine Palma | 27 | Daughter | Secretarial | New York |
| 23 | Victor B. Palma | 24 | Son | Chemist | Ohio |
| 24 | Ernest Palma | 16 | Son | — | Ohio |
| 25 | Eguista Cola | 62 | Mother-in-law | — | Italy |
| 26 | Michael De Main | 54 | Head | Track Work | Italy |
| 27 | Lena De Main | 51 | Wife | — | Italy |
| 28 | Joseph De Main | 17 | Son | — | Ohio |
| 29 | Michael Jr. De Main | 14 | Son | — | Ohio |
| 30 | Phillip Vitacula | 22 | Son-in-law | Labor | Ohio |
| 31 | Rose Vitacula | 22 | Daughter | — | Ohio |
| 32 | Jeanne Vitacula | 1 | Grandchild | — | Ohio |
| 33 | George Higgins | 48 | Head | Yard Brakeman | Ohio |
| 34 | Susan Higgins | 44 | Wife | — | Pennsylvania |
| 35 | Robert Higgins | 20 | Son | New Worker | Ohio |
| 36 | Janice Higgins | 18 | Daughter | — | Ohio |
| 37 | Lee Hammon | 52 | Head | Pipe Fitter | Ohio |
| 38 | Minnie Hammon | 54 | Wife | — | Ohio |
| 39 | Anthony Nicola | 60 | Head | Blast Furnace | Italy |
| 40 | Carmel Nicola | 58 | Wife | — | Italy |
Pedigree Summary
John + 2 siblings
Gen 1 · 5 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)