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John Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this John Dempsey across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed), with identified parents Mary — first a son (b.~1896), then head of a 5-person household.
Age 44
b. ~1896
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati City |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Occupation | Lawyer |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Lawyer |
| Township / Ward | Cincinnati City |
| Est. Birth Year | ~1896 |
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 |
|---|---|---|---|---|
| Mary Dempsey | Head | — | 73 | ~1867 |
| Edward Dempsey | Son | — | 42 | ~1898 |
| John Dempsey | Son | — | 44 | ~1896 |
| Margaret Dempsey | Daughter | — | 41 | ~1899 |
| Virginia Dempsey | Daughter | — | 35 | ~1905 |
Census Appearances
1920
Hamilton, Ohio
Son, age 24
Hamilton, Ohio · implied b. ~1896 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Hamilton, Ohio
Son, age 34
Hamilton, Ohio · implied b. ~1896 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Lawyer |
| Industry | Law Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | WW |
| Veteran | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Son, age 44
Hamilton-County, Ohio · implied b. ~1896 — 5 household members
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati City |
| 1935 Residence (County) | Hamilton |
| Occupation | Lawyer |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | Hs 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 John Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Dempsey (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Dempsey
b. ~1866
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Dempsey
Son · 1940 · age 44 · b. ~1896 · Ohio
★ You are viewing this record
Sibling
Margaret Dempsey
Sibling · 1940 · age 41
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Dempsey
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Dempsey
Sibling · 1940 · age 42
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 — Hamilton-County, Ohio
Open full size
1940 US Federal Census — Hamilton-County, Ohio
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03199-00779)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy Carpenter | 12 | daughter | — | Ohio |
| 3 | Frank Duffy | 54 | Head | Switchman | Ohio |
| 4 | Minnie Duffy | 58 | wife | — | Ohio |
| 5 | Francis Duffy | 28 | son | Timekeeper | Ohio |
| 6 | Russell Van Vleet | 34 | boarder | Clerk | Minnesota |
| 7 | George Fields | 37 | boarder | — | Kentucky |
| 8 | Elmer Binkley | 41 | boarder | — | Ohio |
| 9 | Minnie Schmeyer | 61 | Head | Practical Nurse | Kentucky |
| 10 | Thomas Hackett | 54 | Head | President | Ohio |
| 11 | Helen Hackett | 46 | wife | — | Ohio |
| 12 | Rita Hackett | 22 | daughter | Contact Woman | Ohio |
| 13 | Tommy Hackett | 11 | son | — | Ohio |
| 14 | Margaret Jacobs | 75 | aunt | — | Ohio |
| 15 | Jennie Carlson | 69 | aunt | Manager | Ohio |
| 16 | Louis Cook | 68 | Head | Physician | Ohio |
| 17 | Clara Cook | 68 | wife | — | Illinois |
| 18 | Joseph H. Hahn | 65 | Head | House Painter | Germany |
| 19 | Elizabeth A. Hahn | 60 | wife | — | Ohio |
| 20 | Mildred Hahn | 32 | daughter | Telephone Operator | Ohio |
| 21 | Raymond Hahn | 22 | son | Printer | Ohio |
| 22 | Oscar Rohe | 30 | Head | Timekeeper | Ohio |
| 23 | Gertrude Rohe | 29 | wife | — | Ohio |
| 24 | Clifford Myers | 73 | Head | — | Ohio |
| 25 | Harold Stevens | 39 | son-in-law | Engineer | Ohio |
| 26 | Mary Stevens | 36 | daughter | — | Ohio |
| 27 | Harold Stevens | 7 | grandson | — | Ohio |
| 28 | Robert Stevens | 3 | grandson | — | Ohio |
| 29 | Marcella Minnemann | 18 | maid | Housework | Indiana |
| 30 | Mary Dempsey | 73 | Head | — | Ohio |
| 31 | John Dempsey THIS PERSON | 44 | son | Lawyer | Ohio |
| 32 | Margaret Dempsey | 41 | daughter | — | Ohio |
| 33 | Edward Dempsey | 42 | son | Lawyer | Ohio |
| 34 | Virginia Dempsey | 35 | daughter | Stenographer | Ohio |
| 35 | George H. Bauers | 70 | Head | Partner | Ohio |
| 36 | Rose Bauers | 71 | wife | — | Ohio |
| 37 | Elmer S. Henty | 39 | son-in-law | Partner | Kentucky |
| 38 | Henrietta Henty | 36 | daughter | — | Ohio |
| 39 | Richard Henty | 12 | grandson | — | Ohio |
| 40 | William Henty | 10 | grandson | — | Ohio |
Pedigree Summary
John + 3 siblings
Gen 1 · 1 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)