MK
Mary Knapp — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Buchanan, Missouri
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Buchanan, Missouri (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 6-person household.
Age 9
b. ~1921
Female
Daughter
Born: Missouri
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Buchanan, Missouri |
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Additional Details | |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | St Joseph City |
| Est. Birth Year | ~1921 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Knapp | Daughter | — | 9 | ~1921 |
| Joseph Knapp | Head | — | 42 | ~1888 |
| Hazel Knapp | Spouse | — | 43 | ~1887 |
| Catherine Knapp | Daughter | — | 1 | ~1929 |
| Louis Knapp | Son | — | 11 | ~1919 |
| James Knapp | Son | — | 14 | ~1916 |
Census Appearances
1930
Buchanan, Missouri
Daughter, age 9
Buchanan, Missouri · implied b. ~1921 — 6 household members
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Buchanan-County, Missouri
Daughter, age 20
Buchanan-County, Missouri · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Marjorie L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Washington township |
| 1935 Residence (County) | Buchanan |
| Hours Worked | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 · 1930 · age 9 · b. ~1921 · Missouri
★ You are viewing this record
Sibling
Louis Knapp
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Knapp
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Knapp
Sibling · 1930 · age 1
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
1930 US Federal Census — Buchanan, Missouri
Open full size
1930 US Federal Census — Buchanan, Missouri
Page Contents
50 people indexed on this census page (ia:1930:missouricensus00reel1177:1060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Edward Colby | 50 | Head | Salesman | Missouri |
| 52 | Toney Colby | 38 | Wife | — | Missouri |
| 53 | Walter J Freeman | 49 | Head | Blacksmith | Missouri |
| 54 | Lena H Freeman | 54 | Wife | — | Kansas |
| 55 | Lola Dickerson | 21 | Step-dau | Stenographer | Missouri |
| 56 | Emma Burke | 67 | Head | — | Missouri |
| 57 | Nellie Burke | 42 | Wife-H | — | Illinois |
| 58 | Emily Burke | 42 | Daughter | — | Missouri |
| 59 | Ruth Burke | 35 | Daughter | Bookkeeper | Missouri |
| 60 | Kathryn Burke | 27 | Daughter | Carpenter | Missouri |
| 61 | Harold E Pierson | 45 | Head | — | Missouri |
| 62 | Mable Pierson | 31 | Wife | Salesman | New York |
| 63 | Jane G Pierson | 7 | Daughter | — | Missouri |
| 64 | Mary L Ii Pierson | 5 | Daughter | — | Missouri |
| 65 | Florence Foster | 63 | Cook | Cook | Missouri |
| 66 | John Westbrook | 27 | Head | Sheet Metal Wk | Missouri |
| 67 | Gladys Westbrook | 30 | Wife | — | Missouri |
| 68 | George W Westbrook | 4 | Son | — | Missouri |
| 69 | Velma Jersey | 44 | Head | Retail Merch | Missouri |
| 70 | Othe Jersey | 29 | Wife-H | — | Missouri |
| 71 | Gene Jersey | 21 | Daughter | Retail Merch | Missouri |
| 72 | Dorothy Jersey | 13 | Daughter | — | Missouri |
| 73 | Charles Molony | 66 | Head | Manager | Ireland |
| 74 | Mechtile Molony | 66 | Wife | — | W Virginia |
| 75 | Cecily J Molony | 33 | Daughter | Salesman | W Virginia |
| 76 | Joan Molony | 30 | Daughter | Librarian | Maryland |
| 77 | Margaret M Molony | 23 | Daughter | — | Maryland |
| 78 | John L Calvert | 85 | Head | — | Missouri |
| 79 | Mary Calvert | 62 | Wife | — | Missouri |
| 80 | Charles Calvert | 23 | Son | Paper Maker | Missouri |
| 81 | Joseph M Knapp | 42 | Head | Fireman | Missouri |
| 82 | Hazel A Knapp | 43 | Wife | — | Missouri |
| 83 | James Knapp | 14 | Son | — | Missouri |
| 84 | Louis Knapp | 11 | Son | — | Missouri |
| 85 | Mary Knapp THIS PERSON | 9 | Daughter | — | Missouri |
| 86 | Catherine Knapp | 1 | Daughter | — | Missouri |
| 87 | John Moran | 27 | Head | Engineer | Missouri |
| 88 | Lena Moran | 25 | Wife | — | Kansas |
| 89 | Ruth Moran | 2 | Daughter | — | Missouri |
| 90 | Charles W Bacon | 69 | Head | Baker | Iowa |
| 91 | Cecelia Bacon | 67 | Wife | — | Germany |
| 92 | John Bacon | 40 | Son | Machinist | Missouri |
| 93 | Albert Morgan | 42 | Head | Machinist | Kentucky |
| 94 | Mary Morgan | 41 | Wife | — | Kentucky |
| 95 | Charles Morgan | 18 | Son | — | Missouri |
| 96 | Adaline Collins | 57 | Head | — | Missouri |
| 97 | Adaline Collins | 20 | Daughter | Bill Clerk | Missouri |
| 98 | Charles Morton | 39 | Head | Retail Merch | Alabama |
| 99 | Maud Morton | 38 | Wife | — | Alabama |
| 100 | Adelia Morton | 10 | Daughter | — | Alabama |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)