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John Dennis — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lucas-County, Ohio
Our Model Tree links this John Dennis across the 1930 and 1940 US Censuses in Lucas-County, Ohio (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lucas-County, Ohio |
| Surname | Dennis |
| Given Name | John L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Toledo City |
| 1935 Residence (County) | Lucas |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Toledo City |
| Est. Birth Year | ~1929 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Harley Dennis | Son | — | 15 | ~1925 |
| John Dennis | Son | — | 11 | ~1929 |
| Blanche Dennis | Spouse | — | 35 | ~1905 |
| Donald Dennis | Son | — | 9 | ~1931 |
| Harley Dennis | Head | — | 31 | ~1909 |
| Duane Dennis | Son | — | 12 | ~1928 |
Census Appearances
1930
Lucas, Ohio
Other, age 2
Lucas, Ohio · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dennis |
| Given Name | John L |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Michigan |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Lucas-County, Ohio
Son, age 11
Lucas-County, Ohio · implied b. ~1929 — 6 household members
| Surname | Dennis |
| Given Name | John L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Toledo City |
| 1935 Residence (County) | Lucas |
| Highest Grade | No 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 Dennis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Dennis
Son · 1940 · age 11 · b. ~1929 · Ohio
★ You are viewing this record
Sibling
Duane Dennis
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harley Dennis
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Dennis
Sibling · 1940 · age 9
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 — Lucas-County, Ohio
Open full size
1940 US Federal Census — Lucas-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03266-01009)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Carl A Dienat | 48 | Head | Lawyer | Ohio |
| 42 | Beatrice M Dienat | 46 | Wife | — | England |
| 43 | Ella R Drenat | 72 | Mother | — | Ohio |
| 44 | Elmer R Crosby | 38 | Head | Draftsman | Ohio |
| 45 | Huldah G Crosby | 42 | Wife | — | Michigan |
| 46 | G. Eugene Crosby | 12 | Son | — | Ohio |
| 47 | Beverly G Crosby | 6 | Daughter | — | Ohio |
| 48 | Charles H Kreger | 29 | Head | Die Maker | New York |
| 49 | Margaret E Kreger | 23 | Wife | — | Ohio |
| 50 | Wayne E Kreger | 3 | Son | — | Ohio |
| 51 | Walter F Cousino | 41 | Head | Die Engineer | Ohio |
| 52 | Helen L Cousino | 38 | Wife | — | Ohio |
| 53 | Wayne R Cousino | 16 | Son | — | Ohio |
| 54 | Joan H Cousino | 14 | Daughter | — | Ohio |
| 55 | Doris A Cousino | 12 | Daughter | — | Ohio |
| 56 | John G Brown | 28 | Head | Wholesale Salesman | Ohio |
| 57 | Florence Brown | 25 | Wife | — | Ohio |
| 58 | Charles E Nichols | 50 | Head | Manager | Ohio |
| 59 | Mabelle Nichols | 50 | Wife | — | Ohio |
| 60 | Charles E Nichols | 17 | Son | — | Ohio |
| 61 | William R Nichols | 12 | Son | — | Ohio |
| 62 | John R Tauffman | 38 | Head | Pattern Maker | Ohio |
| 63 | Violet A Tauffman | 37 | Wife | — | Ohio |
| 64 | Ralph J Schultz | 32 | Head | District Meter Engineer | Ohio |
| 65 | Florence M Schultz | 33 | Wife | — | Ohio |
| 66 | Richard C Schultz | 8 | Son | — | Ohio |
| 67 | John R Schultz | 7 | Son | — | Ohio |
| 68 | Donald F Schultz | 5 | Son | — | Ohio |
| 69 | Suzanne M Schultz | 2 | Daughter | — | Ohio |
| 70 | Harley C Dennis | 31 | Head | Postal Clerk | Ohio |
| 71 | Blanche L Dennis | 35 | Wife | — | Michigan |
| 72 | Harley J Dennis | 15 | Son | — | Michigan |
| 73 | Duane R Dennis | 12 | Son | — | Ohio |
| 74 | John L Dennis THIS PERSON | 11 | Son | — | Ohio |
| 75 | Donald J Dennis | 9 | Son | — | Ohio |
| 76 | Gunther H Greifelt | 33 | Head | Die Maker | Germany |
| 77 | Blair H Greifelt | 25 | Wife | — | Ohio |
| 78 | Marie H Greifelt | 4 | Daughter | — | Ohio |
| 79 | Gertrude S Greifelt | 2 | Daughter | — | Ohio |
| 80 | Russell H Brown | 43 | Head | Accountant | 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)