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William Knapp — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Tazewell, Illinois
Our Model Tree links this William Knapp across the 1930 and 1940 US Censuses in Tazewell, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 10-person household.
Age 5
b. ~1925
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Tazewell, Illinois |
| Surname | Knapp |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Deer Creek Township |
| Est. Birth Year | ~1925 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| George Knapp | Son | — | 19 | ~1911 |
| William Knapp | Son | — | 5 | ~1925 |
| Elmer Knapp | Son | — | 17 | ~1913 |
| Alice Knapp | Daughter | — | 13 | ~1917 |
| Albert Knapp | Son | — | 16 | ~1914 |
| Clementine Knapp | Daughter | — | 14 | ~1916 |
| William Knapp | Head | — | 47 | ~1883 |
| Luella Knapp | Daughter | — | 14 | ~1916 |
| Christine Knapp | Daughter | — | 10 | ~1920 |
| Mollie Knapp | Other | — | 41 | ~1889 |
Census Appearances
1930
Tazewell, Illinois
Son, age 5
Tazewell, Illinois · implied b. ~1925 — 10 household members
| Surname | Knapp |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Tazewell-County, Illinois
Son, age 15
Tazewell-County, Illinois · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knepp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Deer Creek |
| 1935 Residence (County) | Tazewell |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 52 |
| Income (1939) | 888 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| 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 William Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Knapp
Son · 1930 · age 5 · b. ~1925 · Illinois
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Sibling
George Knapp
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Luella Knapp
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Knapp
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Christine Knapp
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elmer Knapp
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Knapp
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clementine Knapp
Sibling · 1930 · age 14
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 — Tazewell, Illinois
Open full size
1930 US Federal Census — Tazewell, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel562:0260)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Abraham Hatton | 75 | Father-in-law | — | Ohio |
| 2 | Ervin Wyss | 30 | Head | Farm Hand | Illinois |
| 3 | Lois Wyss | 25 | Wife-H | — | Illinois |
| 4 | Ervin Jr. Wyss | 4 | Son | — | Illinois |
| 5 | Mary Wyss | 3 | Daughter | — | Illinois |
| 6 | Cordelia Wyss | 1 | Daughter | — | Illinois |
| 7 | Willis Newell | 45 | Head | Farmer | Illinois |
| 8 | Minnie Newell | 39 | Wife-H | — | Illinois |
| 9 | Harley Polymer | 38 | Head | Farmer | Illinois |
| 10 | Sadie Polymer | 35 | Wife-H | — | Illinois |
| 11 | August Bollinger | 56 | Head | Farmer | Illinois |
| 12 | Tessa Bollinger | 46 | Wife-H | — | Indiana |
| 13 | August Jr. Bollinger | 5 | Son | — | Illinois |
| 14 | Valde Johnson | 32 | Head | Farmer | Illinois |
| 15 | Vern Johnson | 32 | Wife-H | — | Illinois |
| 16 | Wendell Johnson | 10 | Son | — | Illinois |
| 17 | Eugene Johnson | 8 | Son | — | Illinois |
| 18 | Vildora Johnson | 7 | Son | — | Illinois |
| 19 | Russell Moore | 17 | Farm Hand | Farm Hand | Illinois |
| 20 | Mary Williams | 58 | Servant | Housekeeper | Illinois |
| 21 | William Knapp | 47 | Head | Farmer | Germany |
| 22 | Mollie Knapp | 41 | Wife-H | — | Illinois |
| 23 | George Knapp | 19 | Son | Farm Hand | Illinois |
| 24 | Clementine Knapp | 14 | Daughter | — | Illinois |
| 25 | Elmer Knapp | 17 | Son | Farm Hand | Illinois |
| 26 | Albert Knapp | 16 | Son | — | Illinois |
| 27 | Luella Knapp | 14 | Daughter | — | Illinois |
| 28 | Alice Knapp | 13 | Daughter | — | Illinois |
| 29 | Christine Knapp | 10 | Daughter | — | Illinois |
| 30 | William Jr. Knapp THIS PERSON | 5 | Son | — | Illinois |
| 31 | Theodore Hays | 57 | Head | Farmer | Illinois |
| 32 | Euphemia Hays | 54 | Wife-H | — | Illinois |
| 33 | Thierry Hays | 31 | Son | Farmer | Illinois |
| 34 | Joseph Hays | 25 | Son | Laborer | Illinois |
| 35 | Catherine Hays | 23 | Daughter | — | Illinois |
| 36 | Harold Hays | 22 | Son | Laborer | Illinois |
| 37 | Edna Hays | 19 | Daughter | — | Illinois |
| 38 | Theodore Jr. Hays | 18 | Son | Laborer | Illinois |
| 39 | Jesse Smith | 48 | Head | Laborer | Indiana |
| 40 | Leah Smith | 49 | Wife-H | — | Illinois |
| 41 | Alpheus Smith | 19 | Son | — | Illinois |
| 42 | David Smith | 12 | Son | — | Illinois |
| 43 | Vivian Smith | 9 | Daughter | — | Illinois |
| 44 | Arthur Newell | 17 | Step-Son | — | Illinois |
| 45 | Willis Newell | 13 | Step-Son | — | Illinois |
| 46 | Theodore Peffer | 61 | Head | Farmer | Pennsylvania |
| 47 | Luella Peffer | 38 | Wife-H | — | Illinois |
| 48 | William Peffer | 11 | Son | — | Illinois |
| 49 | Clifford Peffer | 9 | Son | — | Illinois |
| 50 | Marcella Peffer | 8 | Daughter | — | Illinois |
Related Census Records
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)