MK
Mary Knapp — 1930 US Census Record
Model Tree available1930 United States Federal Census · Hamilton, Illinois
Our Model Tree links this Mary Knapp across the 1910, 1920 and 1930 US Censuses in Hamilton, Illinois (XGBoost, ~Confirmed), with identified parents G & Grover — first a daughter (b.~1909), then head of a 10-person household.
Age 21
b. ~1909
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Hamilton, Illinois |
| Surname | Knapp |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Dahlgren Township |
| Est. Birth Year | ~1909 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| G Knapp | Head | — | 42 | ~1888 |
| Anna Knapp | Daughter | — | 6 | ~1924 |
| Ralph Knapp | Son | — | 17 | ~1913 |
| Florence Knapp | Other | — | 42 | ~1888 |
| Stanley Knapp | Son | — | 9 | ~1921 |
| Audrey Knapp | Daughter | — | 2 | ~1928 |
| Fred Knapp | Son | — | 10 | ~1920 |
| Leila Knapp | Daughter | — | 12 | ~1918 |
| Mary Knapp | Daughter | — | 21 | ~1909 |
| Betty Knapp | Daughter | — | 15 | ~1915 |
Census Appearances
1910
Hamilton, Illinois
Daughter, age
Hamilton, Illinois · implied b. ~1910 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Hamilton, Illinois
Daughter, age 10
Hamilton, Illinois · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Hamilton, Illinois
Daughter, age 21
Hamilton, Illinois · implied b. ~1909 — 10 household members
| Surname | Knapp |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 3 US Census years (1910, 1920 and 1930) in Hamilton, Illinois, using XGBoost record linkage. Identified parents: father G Knapp (~0.92 confidence) and father Grover Knapp (~0.92 confidence) and father James Knapp (~0.92 confidence) and mother Ada Knapp (~0.92 confidence) and mother Ada Knapp (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
G Knapp
b. ~1888
Source father
● Household
· direct · ~0.92
Father
Grover Knapp
b. ~1888
Source father
● Household
· direct · ~0.92
Father
James Knapp
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Ada Knapp
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Ada Knapp
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Knapp
Daughter · 1930 · age 21 · b. ~1909 · Illinois
★ You are viewing this record
Sibling
Fred Knapp
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Knapp
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Knapp
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Audrey Knapp
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Knapp
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leila Knapp
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Knapp
Sibling · 1930 · age 6
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 — Hamilton, Illinois
Open full size
1930 US Federal Census — Hamilton, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel514:0913)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph W. Klinker | 55 | Head | Farmer | Illinois |
| 2 | Anna B. Klinker | 54 | Wife-H | — | Illinois |
| 3 | Albert R. Klinker | 25 | Son | Farm Laborer | Illinois |
| 4 | Willie W. Klinker | 23 | Son | Farm Laborer | Illinois |
| 5 | Nora M. Klinker | 16 | Daughter | — | Illinois |
| 6 | Perry A. Sexton | 42 | Head | Farmer | Illinois |
| 7 | Zonia R. Sexton | 30 | Wife-H | — | Illinois |
| 8 | Emma B. Sexton | 5 | Daughter | — | Illinois |
| 9 | W. Albert Thull | 70 | Head | Farmer | Illinois |
| 10 | Mary M. Thull | 70 | Wife-H | — | Illinois |
| 11 | Mollie J. Thull | 45 | Daughter | — | Illinois |
| 12 | Casper E. Sexton | 38 | Head | Farmer | Illinois |
| 13 | Matilda M. Sexton | 73 | Mother-H | — | Ohio |
| 14 | Emmanuelle W. Tennyson | 62 | Head | Farmer | Illinois |
| 15 | Martha F. Tennyson | 61 | Wife-H | — | Illinois |
| 16 | Harry V. Richardson | 31 | Head | Farmer | Illinois |
| 17 | Dorothy S. Richardson | 28 | Wife-H | — | Illinois |
| 18 | Virgil L. Richardson | 2 | Son | — | Illinois |
| 19 | Jesse W. Garrison | 36 | Head | Farmer | Illinois |
| 20 | Lulu E. Garrison | 27 | Wife-H | — | United States |
| 21 | Clara B. Garrison | 5 | Daughter | — | Illinois |
| 22 | William R. Garrison | 2 | Son | — | Illinois |
| 23 | Isaac Irwin | 52 | Head | Farmer | Illinois |
| 24 | Eliza B. Irwin | 46 | Wife-H | — | Illinois |
| 25 | Effie Irwin | 19 | Daughter | — | Illinois |
| 26 | Harry Irwin | 16 | Son | Farm Laborer | Illinois |
| 27 | Grace Irwin | 13 | Daughter | — | Illinois |
| 28 | Willie Irwin | 11 | Son | — | Illinois |
| 29 | Ruth Irwin | 3 | Daughter | — | Illinois |
| 30 | Mary Kehrer | 47 | Head | Farmer | Illinois |
| 31 | Mary J. Kehrer | 14 | Daughter | — | Illinois |
| 32 | Frank Kehrer | 11 | Son | — | Illinois |
| 33 | Otis Kehrer | 9 | Son | — | Illinois |
| 34 | Charles H. Butler | 54 | Head | Farmer | Illinois |
| 35 | Nancy E. Butler | 51 | Wife-H | — | Illinois |
| 36 | Otis Butler | 24 | Son | Farm Laborer | Illinois |
| 37 | Essie Butler | 17 | Son | — | Illinois |
| 38 | Fowler Butler | 15 | Son | — | Illinois |
| 39 | Minor Butler | 13 | Son | — | Illinois |
| 40 | Ileta L. Butler | 8 | Daughter | — | Illinois |
| 41 | G. Grover Knapp | 42 | Head | Farmer | Illinois |
| 42 | Florence A. Knapp | 42 | Wife-H | — | Illinois |
| 43 | Mary A. Knapp THIS PERSON | 21 | Daughter | — | Illinois |
| 44 | Ralph L. Knapp | 17 | Son | Farm Laborer | Illinois |
| 45 | Betty Knapp | 15 | Daughter | — | Illinois |
| 46 | Leila L. Knapp | 12 | Daughter | — | Illinois |
| 47 | Fred K. Knapp | 10 | Son | — | Illinois |
| 48 | Stanley W. Knapp | 9 | Son | — | Illinois |
| 49 | Anna M. Knapp | 6 | Daughter | — | Illinois |
| 50 | Audrey Knapp | 2 | Daughter | — | Illinois |
Pedigree Summary
Mary + 7 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)