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William Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Ohio
Our Model Tree links this William Leonard across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Ohio (XGBoost, ~Confirmed) — first a head (b.~1870), then head of a 5-person household.
Age 70
b. ~1870
Male
Head
Born: Ohio
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Ohio |
| Surname | Leonard |
| Given Name | William C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Dayton City |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Dayton City |
| Est. Birth Year | ~1870 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Frances Harkins | Daughter | — | 41 | ~1899 |
| William Leonard | Head | — | 70 | ~1870 |
| Herman Harkins | Other | — | 41 | ~1899 |
| Kathryn Harkins | Other | — | 10 | ~1930 |
| Kathryn Leonard | Spouse | — | 62 | ~1878 |
Census Appearances
1920
Montgomery, Ohio
Head, age 50
Montgomery, Ohio · implied b. ~1870 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | William E |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Retail Merchant |
| Industry | Coal |
| Class of Worker | Emp |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | F |
| Birth State | Ohio |
| Birth Country | United States |
| Year of Naturalization | O |
| Birthplace (normalized) | ohio |
1930
Montgomery, Ohio
Head, age 60
Montgomery, Ohio · implied b. ~1870 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | William E |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ohio |
| Age at First Marriage | 28 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Owner |
| Industry | Coal Yard |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | 8000 |
| Home Value / Rent | R |
| Veteran | O |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Montgomery-County, Ohio
Head, age 70
Montgomery-County, Ohio · implied b. ~1870 — 5 household members
| Surname | Leonard |
| Given Name | William C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Dayton City |
| 1935 Residence (County) | Montgomery |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 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 William Leonard across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Leonard
Head · 1940 · age 70 · b. ~1870 · 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
25 people indexed on this census page (nara:1940:m-t0627-03255-00309)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Martha Ann Costner | 17 | Daughter | — | Ohio |
| 2 | Emma Charlotte Miller | 83 | Sister in law | — | Ohio |
| 3 | George H. Snyder | 60 | Head | Salesman | Ohio |
| 4 | Emma K. Snyder | 51 | Wife | — | Ohio |
| 5 | Thomas G. Snyder | 20 | Son | Apprentice Tool Making | Ohio |
| 6 | Joseph L. Shafshure | 62 | Head | Salesman | Kentucky |
| 7 | Margaret S. Shafshure | 61 | Wife | Engineer | Kentucky |
| 8 | Adolph R. Euchenhofer | 61 | Head | Supervising | Ohio |
| 9 | Elizabeth A. Euchenhofer | 63 | Wife | — | Indiana |
| 10 | Edward V. Stocklein | 53 | Head | Director Welfare | Ohio |
| 11 | May F. Stocklein | 54 | Wife | — | Ohio |
| 12 | Virginia M. Stocklein | 24 | Daughter | — | Ohio |
| 13 | Rita Ann Stocklein | 19 | Daughter | — | Ohio |
| 14 | Iris Jean Stocklein | 16 | Daughter | — | Ohio |
| 15 | Joseph H. Ferneding | 52 | Brother in law | Interviewer Maintenance | Ohio |
| 16 | Ernest C. Genn | 44 | Head | Engineer | Indiana |
| 17 | Helen H. Genn | 38 | Wife | Sub Teacher | Ohio |
| 18 | Caroline M. Genn | 58 | Mother in law | — | Ohio |
| 19 | William C. Leonard THIS PERSON | 70 | Head | — | Ohio |
| 20 | Kathryn C. Leonard | 62 | Wife | — | Ohio |
| 21 | Frances S. Harkins | 41 | Daughter | Teacher Sub-Rings | Ohio |
| 22 | Herman R. Harkins | 41 | Son in law | Proprietor | Ohio |
| 23 | Kathryn E. Harkins | 10 | Grand daughter | — | Ohio |
| 24 | Lester A. Eagle | 56 | Head | Sales Clerk | Ohio |
| 25 | Florence V. Eagle | 53 | Wife | Bookkeeper | Ohio |
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)