MK
Mary Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Van-Buren-County, Michigan
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Van-Buren-County, Michigan (XGBoost, ~Confirmed) — first a daughter (b.~1915), then head of a 10-person household.
Age 25
b. ~1915
Female
Daughter
Born: Wisconsin
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Van-Buren-County, Michigan |
| Surname | Knapp |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | South Haven Township |
| 1935 Residence (County) | Van Buren |
| Additional Details | |
| Occupation | saleslady |
| Industry | dress shop |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 670 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Saleslady |
| Township / Ward | South Haven Township |
| Est. Birth Year | ~1915 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Leo Knapp | Son | — | 16 | ~1924 |
| William Knapp | Head | — | 77 | ~1863 |
| Francis Knapp | Son | — | 9 | ~1931 |
| Helen Knapp | Son | — | 23 | ~1917 |
| Emma Knapp | Spouse | — | 49 | ~1891 |
| Ruth Knapp | Daughter | — | 21 | ~1919 |
| Emma Knapp | Daughter | — | 15 | ~1925 |
| Teresa Knapp | Daughter | — | 13 | ~1927 |
| Nelly Knapp | Son | — | 18 | ~1922 |
| Mary Knapp | Daughter | — | 25 | ~1915 |
Census Appearances
1930
Van Buren, …
Daughter, age 15
Van Buren, Michigan · implied b. ~1915 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Van-Buren-County, Michigan
Daughter, age 25
Van-Buren-County, Michigan · implied b. ~1915 — 10 household members
| Surname | Knapp |
| Given Name | Mary Louise |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | South Haven Township |
| 1935 Residence (County) | Van Buren |
| Occupation | saleslady |
| Industry | dress shop |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 670 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 25 · b. ~1915 · Michigan
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Sibling
Ruth Knapp
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teresa Knapp
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emma Knapp
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Knapp
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Knapp
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Knapp
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nelly Knapp
Sibling · 1940 · age 18
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 — Van-Buren-County, Michigan
Open full size
1940 US Federal Census — Van-Buren-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01822-00978)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lola D. Knapp | 66 | Wife | — | Hungary |
| 2 | William H. Knapp | 77 | Head | Core-Cleaner | Wisconsin |
| 3 | Emma C. Knapp | 49 | Wife | — | Wisconsin |
| 4 | Mary Louise Knapp THIS PERSON | 25 | Daughter | Saleslady | Wisconsin |
| 5 | Helen N. Knapp | 23 | Son | Laborer | Wisconsin |
| 6 | Ruth M. Knapp | 21 | Daughter | Saleslady | Michigan |
| 7 | Nelly M. Knapp | 18 | Son | — | Michigan |
| 8 | Leo L. Knapp | 16 | Son | — | Michigan |
| 9 | Emma Ann Knapp | 15 | Daughter | — | Michigan |
| 10 | Teresa C. Knapp | 13 | Daughter | — | Michigan |
| 11 | Francis X.B. Knapp | 9 | Son | — | Michigan |
| 12 | Maud G. Maylott | 66 | Head | — | Michigan |
| 13 | Frank G. Covey | 36 | Head | Truck-Driver | Michigan |
| 14 | Julia Covey | 35 | Wife | — | Russia |
| 15 | Norma Covey | 14 | Daughter | — | Michigan |
| 16 | William Hosier | 62 | Head | Furniture Repair | Michigan |
| 17 | Susie E. Hosier | 58 | Wife | — | Michigan |
| 18 | John Lofberg | 42 | Head | Trim-Sawer | Sweden |
| 19 | Adeline A. Lofberg | 40 | Wife | — | Michigan |
| 20 | Harry Crawford | 43 | Head | — | West Virginia |
| 21 | Charles Crawford | 8 | Son | — | Michigan |
| 22 | Ann Crawford | 7 | Daughter | — | Michigan |
| 23 | Mary Crawford | 6 | Daughter | — | Michigan |
| 24 | Robert Crawford | 5 | Son | — | Michigan |
| 25 | Carl Cappe | 30 | Head | Electric Repairman | Missouri |
| 26 | Eva Cappe | 28 | Wife | — | Indiana |
| 27 | Charles N. Cappe | 9 | Son | — | Michigan |
| 28 | Catherine L. Cappe | 7 | Daughter | — | Michigan |
| 29 | Charlene S. Cappe | 4 | Daughter | — | Michigan |
| 30 | Catherine Pappe | 52 | Head | — | Hungary |
| 31 | Harden Margaret A. Pappe | 12 | Daughter | — | Michigan |
| 32 | Walter S. Seavey | 67 | Head | Carpenter | Illinois |
| 33 | Edna F. Seavey | 60 | Wife | — | Ohio |
| 34 | Ernest B. Seavey | 37 | Son | Repair Man | Illinois |
| 35 | Leslie C. Seavey | 28 | Son | Mechanic | Michigan |
| 36 | Clarence Ross | 35 | Head | Patcher | Illinois |
| 37 | Anna Ross | 31 | Wife | — | Illinois |
| 38 | Edith Ross | 13 | Daughter | — | Michigan |
| 39 | Virginia Ross | 5 | Daughter | — | Michigan |
| 40 | Donald Ross | 2 | Son | — | Michigan |
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)