MK
Mary Knapp — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Posey, Indiana
Our Model Tree links this Mary Knapp across the 1920 and 1930 US Censuses in Posey, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 6-person household.
Age 12
b. ~1918
Female
Daughter
Born: Indiana
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Posey, Indiana |
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Robinson Township |
| Est. Birth Year | ~1918 |
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 |
|---|---|---|---|---|
| Anna Knapp | Spouse | — | 34 | ~1896 |
| Mary Knapp | Daughter | — | 12 | ~1918 |
| Anthony Knapp | Son | — | 1 | ~1929 |
| John Knapp | Head | — | 42 | ~1888 |
| Hellen Knapp | Daughter | — | 8 | ~1922 |
| Walter Knapp | Son | — | 9 | ~1921 |
Census Appearances
1920
Posey, Indiana
Daughter, age 2
Posey, Indiana · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary J |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Posey, Indiana
Daughter, age 12
Posey, Indiana · implied b. ~1918 — 6 household members
| Surname | Knapp |
| Given Name | Mary |
| 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 |
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 (1920 and 1930) in Posey, Indiana, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knapp
Daughter · 1930 · age 12 · b. ~1918 · Indiana
★ You are viewing this record
Sibling
Walter Knapp
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hellen Knapp
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony 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 — Posey, Indiana
Open full size
1930 US Federal Census — Posey, Indiana
Page Contents
50 people indexed on this census page (ia:1930:indianacensus00reel622:1154)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Joseph Roester | 70 | Head | Carpenter | Indiana |
| 52 | Josephina Roester | 67 | Wife | — | Indiana |
| 53 | John Knapp | 42 | Head | Painter | Indiana |
| 54 | Anna Knapp | 34 | Wife | — | Indiana |
| 55 | Mary Knapp THIS PERSON | 12 | Daughter | — | Indiana |
| 56 | Walter Knapp | 9 | Son | — | Indiana |
| 57 | Hellen Knapp | 8 | Daughter | — | Indiana |
| 58 | Anthony Knapp | 1 | Son | — | Indiana |
| 59 | Joseph W. Schneider | 59 | Head | Butcher | Indiana |
| 60 | Maggie T. Schneider | 60 | Wife | — | Indiana |
| 61 | Arthur J. Schneider | 21 | Son | Laborer | Indiana |
| 62 | Charles N. Raper | 50 | Head | Merchant | Indiana |
| 63 | Anna Raper | 47 | Wife | — | Indiana |
| 64 | Theresa Raper | 20 | Daughter | Salesman | Indiana |
| 65 | William Raper | 17 | Son | Salesman | Indiana |
| 66 | Anthony Raper | 15 | Daughter | — | Indiana |
| 67 | Antonetta Raper | 15 | Daughter | — | Indiana |
| 68 | Mary Raper | 12 | Daughter | — | Indiana |
| 69 | Henry Raper | 10 | Son | — | Indiana |
| 70 | Angela Raper | 8 | Daughter | — | Indiana |
| 71 | Rita Raper | 4 | Daughter | — | Indiana |
| 72 | Rosa A. Raper | 2 | Daughter | — | Indiana |
| 73 | Alice Raper | 0 | Daughter | — | Indiana |
| 74 | Amelia Fehrenbacher | 34 | Head | Dressmaker | Indiana |
| 75 | Harold Fehrenbacher | 12 | Son | — | Indiana |
| 76 | Joseph Fehrenbacher | 10 | Son | — | Indiana |
| 77 | Hellen Fehrenbacher | 8 | Daughter | — | Indiana |
| 78 | Melvin Fehrenbacher | 7 | Son | — | Indiana |
| 79 | Vernita Fehrenbacher | 5 | Daughter | — | Indiana |
| 80 | James Pfeiffer | 27 | Head | Clergyman | Germany |
| 81 | Elisabeth Kretz | 66 | Servant | — | Indiana |
| 82 | Agnes Noehne | 26 | Servant | — | Indiana |
| 83 | Henry Trapp | 36 | Assistant | Clergyman | Indiana |
| 84 | Veronica Wassmer | 71 | Head | Dressmaker | Indiana |
| 85 | Katie Wassmer | 69 | Sister | Dressmaker | Indiana |
| 86 | Emil Seibert | 38 | Head | Janitor | Indiana |
| 87 | Margret Seibert | 35 | Wife | — | Indiana |
| 88 | Henrietta Seibert | 12 | Daughter | — | Indiana |
| 89 | Wilferd Seibert | 11 | Son | — | Indiana |
| 90 | Clarence Seibert | 10 | Son | — | Indiana |
| 91 | Vincent Seibert | 8 | Son | — | Indiana |
| 92 | Rosella Seibert | 6 | Daughter | — | Indiana |
| 93 | Hellen Seibert | 5 | Daughter | — | Indiana |
| 94 | Francis Seibert | 3 | Son | — | Indiana |
| 95 | Alfred Seibert | 1 | Son | — | Indiana |
| 96 | Mary David Weber | 43 | Head | — | Indiana |
| 97 | Claudia Pistner | 59 | Sister | Teacher | Indiana |
| 98 | Desideria Borgerding | 54 | Sister | Teacher | Ohio |
| 99 | Cletus Mesemer | 51 | Sister | Teacher | Indiana |
| 100 | Cordula Werner | 37 | Sister | Teacher | Ohio |
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)