JK
John Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Richland-County, Ohio
Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Richland-County, Ohio (XGBoost, ~Confirmed) — first a head (b.~1893), then head of a 6-person household.
Age 47
b. ~1893
Male
Head
Born: Czechoslovakia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, Ohio |
| Surname | Knapp |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Czechoslovakia |
| 1935 Residence (City) | Mansfield |
| 1935 Residence (County) | Richland |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Moulder |
| Industry | Brass + Pump Mfg Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 338 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
| Occupation | Moulder |
| Township / Ward | Mansfield |
| Est. Birth Year | ~1893 |
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 |
|---|---|---|---|---|
| Frank Knapp | Son | — | 10 | ~1930 |
| John Knapp | Head | — | 47 | ~1893 |
| Mary Knapp | Spouse | — | 44 | ~1896 |
| Andy Knapp | Son | — | 20 | ~1920 |
| Michael Knapp | Son | — | 5 | ~1935 |
| Joseph Knapp | Son | — | 17 | ~1923 |
Census Appearances
1930
Richland, Ohio
Head, age 37
Richland, Ohio · implied b. ~1893 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Czechoslovakia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1923 |
| Age at First Marriage | 25 |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Occupation | Molder |
| Industry | Barnes Mfg Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Slovak |
| Home Owned/Rented | O |
| Home Value / Rent | $4000 |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
1940
Richland-County, Ohio
Head, age 47
Richland-County, Ohio · implied b. ~1893 — 6 household members
| Surname | Knapp |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Czechoslovakia |
| 1935 Residence (City) | Mansfield |
| 1935 Residence (County) | Richland |
| Naturalization Status | Naturalized |
| Occupation | Moulder |
| Industry | Brass + Pump Mfg Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 338 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
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 Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Knapp
Head · 1940 · age 47 · b. ~1893 · Ohio
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Richland-County, Ohio
Open full size
1940 US Federal Census — Richland-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03135-00265)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Sobek | 21 | Head | Labourer | Ohio |
| 2 | Suella Sobek | 17 | Wife | — | Ohio |
| 3 | Harold Sobek | 1 | Son | — | Ohio |
| 4 | Roberta Sobek | 0 | Daughter | — | Ohio |
| 5 | John Knapp THIS PERSON | 47 | Head | Moulder | Czechoslovakia |
| 6 | Mary Knapp | 44 | Wife | — | Czechoslovakia |
| 7 | Andy Knapp | 20 | Son | Range Line | Czechoslovakia |
| 8 | Joseph Knapp | 17 | Son | — | Czechoslovakia |
| 9 | Frank Knapp | 10 | Son | — | Ohio |
| 10 | Michael Knapp | 5 | Son | — | Ohio |
| 11 | Walter E. Hunt | 38 | Head | Labourer | Ohio |
| 12 | Kathryn Hunt | 36 | Wife | Tube Dept. | Ohio |
| 13 | Kathleen Hunt | 15 | Daughter | — | Ohio |
| 14 | Lorraine Hunt | 13 | Daughter | — | Ohio |
| 15 | Ronald Hunt | 12 | Son | — | Ohio |
| 16 | Wesley Hunt | 9 | Son | — | Ohio |
| 17 | Charlie W. Penman | 68 | Head | — | Ohio |
| 18 | Hetta A. Penman | 68 | Wife | — | Ohio |
| 19 | Olive Priscilla Penman | 28 | Daughter | — | Ohio |
| 20 | Esther Williams | 40 | Head | Janitor | Ohio |
| 21 | (Misinformed About Number In This Family) Williams | None | — | — | — |
| 22 | Jacob Campbell | 28 | Head | Maintenance | Ohio |
| 23 | Gladys Campbell | 25 | Wife | — | Kansas |
| 24 | Patricia Campbell | 6 | Daughter | — | Ohio |
| 25 | Dorothy Campbell | 5 | Daughter | — | Ohio |
| 26 | Charlotte Campbell | 3 | Daughter | — | Ohio |
| 27 | Daisy Mae Emmons | 74 | Head | — | Ohio |
| 28 | George Dinius | 61 | Head | Ticket Taker | Ohio |
| 29 | Carrie Boyer | 51 | Housekeeper | Housekeeper | Ohio |
| 30 | Lucille Boyer | 29 | Housekeeper's Daughter | Tube Dept. | Ohio |
| 31 | Ruby Boyer | 22 | Housekeeper's Daughter | Typist | Ohio |
| 32 | (Neighbor Told Me Five Persons And Was Only Four) | None | — | — | — |
| 33 | Adam Pifer | 72 | Head | Salesman | Germany |
| 34 | Emma Pifer | 63 | Wife | — | Germany |
| 35 | Albert Pifer | 40 | Son | Trucking | Ohio |
| 36 | Louis Pifer | 35 | Son | Automobile Mechanic | Ohio |
| 37 | John Pifer | 32 | Son | Garage Helper | Iowa |
| 38 | Gladys Jacobs | 35 | Head | — | Ohio |
| 39 | Billy Jacobs | 14 | Son | Caddy | Ohio |
| 40 | Andrew Grohol | 44 | Head | Tire Builder | Ohio |
Related Census Records
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)