MK
Mary Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Joseph-County, Indiana
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in St.-Joseph-County, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1917), then head of a 7-person household.
Age 23
b. ~1917
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Joseph-County, Indiana |
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | South Bend City |
| 1935 Residence (County) | St. Joseph |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | South Bend City |
| Est. Birth Year | ~1917 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Carol Knapp | Daughter | — | 14 | ~1926 |
| Raymon Knapp | Head | — | 49 | ~1891 |
| Gloria Knapp | Daughter | — | 14 | ~1926 |
| Dean Knapp | Son | — | 20 | ~1920 |
| Mary Knapp | Daughter | — | 23 | ~1917 |
| Laura Knapp | Spouse | — | 50 | ~1890 |
| Robert Schock | Other | — | 10 | ~1930 |
Census Appearances
1930
St Joseph, …
Daughter, age 12
St Joseph, Indiana · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knepp |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
St.-Joseph-County, Indiana
Daughter, age 23
St.-Joseph-County, Indiana · implied b. ~1917 — 7 household members
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | South Bend City |
| 1935 Residence (County) | St. Joseph |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Mary Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knapp
Daughter · 1940 · age 23 · b. ~1917 · Indiana
★ You are viewing this record
Sibling
Gloria Knapp
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carol Knapp
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dean Knapp
Sibling · 1940 · age 20
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 — St.-Joseph-County, Indiana
Open full size
1940 US Federal Census — St.-Joseph-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01135-00105)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Otto J. Warthman | 46 | Head | Furnace Rep. | Indiana |
| 2 | Nellie Warthman | 39 | Wife | — | Indiana |
| 3 | Billy Irene Warthman | 17 | Daughter | — | Indiana |
| 4 | Leroy H. Swartz | 46 | Head | Reg. Carrier | Indiana |
| 5 | Gladys J. Swartz | 43 | Wife | — | Indiana |
| 6 | Eldon J. Swartz | 16 | Son | — | Indiana |
| 7 | Marion P. Synder | 27 | Son-in-law | Truck Dr. | Indiana |
| 8 | Orleta J. Synder | 24 | Daughter | — | Indiana |
| 9 | Owen M. Synder | 1 | Grandson | — | Indiana |
| 10 | Raymon J. Knapp | 49 | Head | Tool Des. | Indiana |
| 11 | Laura J. Knapp | 50 | Wife | — | Indiana |
| 12 | Mary Knapp THIS PERSON | 23 | Daughter | — | Indiana |
| 13 | Dean R. Knapp | 20 | Son | Machinist | Indiana |
| 14 | Carol Knapp | 14 | Daughter | — | Indiana |
| 15 | Gloria Knapp | 14 | Daughter | — | Indiana |
| 16 | Robert Schock | 10 | Grandson | — | Indiana |
| 17 | Charles W. Jones | 31 | Head | Layout Man | Indiana |
| 18 | Helen Jones | 23 | Wife | — | Indiana |
| 19 | Susan Jones | 2 | Daughter | — | Indiana |
| 20 | Percy J. Beuter | 51 | Head | Rubber Worker | Indiana |
| 21 | Clara Beuter | 55 | Wife | — | Indiana |
| 22 | Steven Dodd | 54 | Head | Carpenter | Indiana |
| 23 | Mary Dodd | 56 | Wife | — | Indiana |
| 24 | Treva Dodd | 15 | Daughter | — | Indiana |
| 25 | Walter Schulz | 43 | Head | Billing Clerk | Indiana |
| 26 | Grace Schulz | 40 | Wife | — | Indiana |
| 27 | Jeanne Schulz | 18 | Daughter | — | Indiana |
| 28 | James Schulz | 15 | Son | — | Indiana |
| 29 | Charles Huber | 38 | Lodger | Engineer | Illinois |
| 30 | Elmer E. Walter | 36 | Head | Asst. Foreman | Indiana |
| 31 | Marjorie Walter | 29 | Wife | — | Indiana |
| 32 | Jamie Ann Walter | 7 | Daughter | — | Indiana |
| 33 | John D. Rasmussen | 55 | Head | Salesman | Denmark |
| 34 | Ruby Rasmussen | 47 | Wife | — | Michigan |
| 35 | Lester Rasmussen | 13 | Son | — | Illinois |
| 36 | Minnie Rasmussen | 79 | Mother | — | Denmark |
| 37 | Fred Mclane | 52 | Head | Decorator | Michigan |
| 38 | Bessie Mclane | 49 | Wife | — | Indiana |
| 39 | Here Ends Block 293 And Begins Block 294 Mclane | None | — | — | — |
| 40 | Charles W. Hytham | 35 | Head | Millwright | Alabama |
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)