WK
William Knapp — 1920 US Census Record
Linked across censuses1920 United States Federal Census · St Clair, Illinois
Our Model Tree links this William Knapp across the 1910 and 1920 US Censuses in St Clair, Illinois (XGBoost, ~Confirmed) — first a son (b.~1900), then head of a 7-person household.
Age 20
b. ~1900
Male
Son
Born: Missouri
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | St Clair, Illinois |
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Prussia Ger |
| Additional Details | |
| Occupation | Stove mounter |
| Industry | Stove factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Stove Mounter |
| Township / Ward | Belleville City |
| Est. Birth Year | ~1900 |
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.
7 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Knapp | Son | — | 20 | ~1900 |
| Albert Knapp | Son | — | 23 | ~1897 |
| Henry Knapp | Son | — | 28 | ~1892 |
| Rosa Knapp | Spouse | — | 58 | ~1862 |
| George Knapp | Head | — | 63 | ~1857 |
| Edward Knapp | Son | — | 17 | ~1903 |
| David Knapp | Son | — | 15 | ~1905 |
Census Appearances
1910
St Clair, …
Son, age 11
St Clair, Illinois · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1920
St Clair, …
Son, age 20
St Clair, Illinois · implied b. ~1900 — 7 household members
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Prussia Ger |
| Occupation | Stove mounter |
| Industry | Stove factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| 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 William Knapp across 2 US Census years (1910 and 1920) in St Clair, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
William Knapp
Son · 1920 · age 20 · b. ~1900 · Illinois
★ You are viewing this record
Sibling
Edward Knapp
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Knapp
Sibling · 1920 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Knapp
Sibling · 1920 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Knapp
Sibling · 1920 · age 28
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
1920 US Federal Census — St Clair, Illinois
Open full size
1920 US Federal Census — St Clair, Illinois
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu403unit:0607)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Stroble | 23 | Head | Moulder | Illinois |
| 2 | Edna Stroble | 21 | Wife | None | Illinois |
| 3 | John Gilding | 47 | Head | Carpenter | Illinois |
| 4 | Anna Gilding | 33 | Wife | None | Illinois |
| 5 | Herbert Gilding | 12 | Son | None | Illinois |
| 6 | Leona Gilding | 10 | Daughter | None | Illinois |
| 7 | Lester Gilding | 3 | Son | None | Illinois |
| 8 | George A. Knapp | 63 | Head | Labor | Missouri |
| 9 | Rosa Knapp | 58 | Wife | None | Prussia Ger |
| 10 | Henry Knapp | 28 | Son | Machinist | Missouri |
| 11 | Albert Knapp | 23 | Son | Stove Mounter | Missouri |
| 12 | William Knapp THIS PERSON | 20 | Son | Stove Mounter | Missouri |
| 13 | Edward Knapp | 17 | Son | Core Maker | Missouri |
| 14 | David Knapp | 15 | Son | Helper | Illinois |
| 15 | John Henning | 56 | Head | Night Watchman | Missouri |
| 16 | Annie Henning | 60 | Wife | None | Missouri |
| 17 | Rudolph Dillinger | 18 | Step Son | Moulder | Illinois |
| 18 | George Leidenbush | 53 | Head | Painter | Illinois |
| 19 | Margaret Leidenbush | 55 | Wife | None | Illinois |
| 20 | Edward Kolb | 39 | Head | Stove Mounter | Illinois |
| 21 | Mary Kolb | 40 | Wife | None | Arkansas |
| 22 | Raymond Kolb | 11 | Son | None | Illinois |
| 23 | John E. Kolb | 10 | Son | None | Illinois |
| 24 | Alice K. Kolb | 8 | Daughter | None | Illinois |
| 25 | Dorothy D. Kolb | 3 | Daughter | None | Illinois |
| 26 | Mary Butler | 69 | Head | None | Wisconsin |
| 27 | James J. Butler | 39 | Son | Labor | Illinois |
| 28 | Benjamin F. Butler | 27 | Son | Labor | Illinois |
| 29 | Herbert Appel | 34 | Head | Moulder | Illinois |
| 30 | Elizabeth Appel | 29 | Wife | None | Illinois |
| 31 | Herbert Appel | 8 | Son | None | Illinois |
| 32 | Ralph Appel | 6 | Son | None | Illinois |
| 33 | Edward Appel | 1 | Son | None | Illinois |
| 34 | August A. Gass | 60 | Head | Moulder | Illinois |
| 35 | Theresa Gass | 59 | Wife | None | Prussia Ger |
| 36 | William Gass | 35 | Son | Labor | Illinois |
| 37 | Edward Kauffmann | 35 | Head | Moulder | Illinois |
| 38 | Frida Kauffmann | 33 | Wife | None | Illinois |
| 39 | Sarah Mckenzie | 89 | Head | None | Illinois |
| 40 | Morris Vogel | 35 | Head | Miner | Bohemia |
| 41 | Mary Vogel | 32 | Wife | None | Bohemia |
| 42 | Rudolph Vogel | 11 | Son | None | Illinois |
| 43 | Joseph Vogel | 4 | Son | None | Illinois |
| 44 | Henry Kauffmann | 26 | Head | Moulder | Illinois |
| 45 | Rosa Kauffmann | 19 | Wife | None | Illinois |
| 46 | Esther Kauffmann | 2 | Daughter | None | Illinois |
| 47 | Arthur Klug | 34 | Head | Carpenter Builder | Illinois |
| 48 | Emelia Klug | 33 | Wife | None | Illinois |
| 49 | James Helm | 52 | Head | Labor | Illinois |
| 50 | Henrietta Helm | 52 | Wife | None | Kentucky |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)