WK
William Koch — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Cook, Illinois
Our Model Tree links this William Koch across the 1910 and 1920 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1903), then head of a 7-person household.
Age 17
b. ~1903
Male
Son
Born: Illinois
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Cook, Illinois |
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | Helper |
| Industry | Automobile |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Helper |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1903 |
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 |
|---|---|---|---|---|
| Adolph Koch | Head | — | 54 | ~1866 |
| Emma Koch | Spouse | — | 43 | ~1877 |
| William Koch | Son | — | 17 | ~1903 |
| Julia Koch | Daughter | — | 20 | ~1900 |
| Minnie Koch | Daughter | — | 18 | ~1902 |
| Clara Koch | Daughter | — | 12 | ~1908 |
| Frederick Koch | Son | — | 14 | ~1906 |
Census Appearances
1910
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1904 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kock |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Cook, Illinois
Son, age 17
Cook, Illinois · implied b. ~1903 — 7 household members
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Helper |
| Industry | Automobile |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| 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 Koch across 2 US Census years (1910 and 1920) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
William Koch
Son · 1920 · age 17 · b. ~1903 · Illinois
★ You are viewing this record
Sibling
Minnie Koch
Sibling · 1920 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clara Koch
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Koch
Sibling · 1920 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frederick Koch
Sibling · 1920 · 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
1920 US Federal Census — Cook, Illinois
Open full size
1920 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu350unit:0786)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Richard Tiemersma | 13 | Son | — | Illinois |
| 2 | Beatrice Tiemersma | 10 | Daughter | — | Illinois |
| 3 | Gertrude Tiemersma | 7 | Daughter | — | Illinois |
| 4 | Genevive Tiemersma | 2 | Daughter | — | Illinois |
| 5 | Head Sticksnyworth | 26 | — | Millwright | New York |
| 6 | Harriett Sticksnyworth | 25 | Wife | — | Illinois |
| 7 | Eileen Sticksnyworth | 2 | Daughter | — | Illinois |
| 8 | Charles Anderson | 64 | Father-in-law | Bricklayer | Sweden |
| 9 | Sofie Anderson | 65 | Mother-in-law | — | Sweden |
| 10 | Frank Anderson | 27 | Brother-in-law | Clerk | Illinois |
| 11 | Frank Hagins | 42 | Head | Carpenter | Ireland |
| 12 | Jane Hagins | 38 | Wife | — | Ireland |
| 13 | James Hagins | 12 | Son | — | Illinois |
| 14 | Mary Hagins | 10 | Daughter | — | Illinois |
| 15 | Frank Hagins | 7 | Son | — | Illinois |
| 16 | Robert Hagins | 3 | Son | — | Illinois |
| 17 | Anton Schelesky | 26 | Head | Mail Carrier | Poland |
| 18 | Barbara Schelesky | 24 | Wife | — | Austria |
| 19 | Clarence Schelesky | 2 | Son | — | Illinois |
| 20 | Joseph Conucha | 6 | Nephew | — | Illinois |
| 21 | Albert Wolter | 57 | Head | Stationary Fireman | Germany |
| 22 | Minnie Wolter | 55 | Wife | — | Germany |
| 23 | William Wolter | 27 | Son | Traffic Manager | Illinois |
| 24 | Helen Wolter | 21 | Daughter | — | Illinois |
| 25 | John Ely | 26 | Head | Conductor | Illinois |
| 26 | Gertrude Ely | 27 | Wife | — | Illinois |
| 27 | Lorraine Ely | 1 | Daughter | — | Illinois |
| 28 | William Hoskin | 45 | Head | Chief Inspector | Illinois |
| 29 | Rose Hoskin | 40 | Wife | — | Illinois |
| 30 | Margerite Hoskin | 14 | Daughter | — | Illinois |
| 31 | Veronica Hoskin | 12 | Daughter | — | Illinois |
| 32 | Evelyn Hoskin | 10 | Daughter | — | Illinois |
| 33 | Mildred Hoskin | 8 | Daughter | — | Illinois |
| 34 | Iodell Hoskin | 1 | Daughter | — | Illinois |
| 35 | James Callahan | 75 | Father-in-law | Laborer | Ireland |
| 36 | William Wehoren | 53 | Head | Carpenter | Wisconsin |
| 37 | Mary Wehoren | 51 | Wife | — | Wisconsin |
| 38 | Rolland Wehoren | 25 | Son | Buyer | Wisconsin |
| 39 | Harold Wehoren | 23 | Son | — | Illinois |
| 40 | Clara Wehoren | 22 | Daughter-in-law | — | Illinois |
| 41 | Lavern Wehoren | 1 | Granddaughter | — | Illinois |
| 42 | Adolph Koch | 54 | Head | Baker | Germany |
| 43 | Emma Koch | 43 | Wife | — | Germany |
| 44 | Julia Koch | 20 | Daughter | Stenographer | Illinois |
| 45 | Minnie Koch | 18 | Daughter | Cashier | Illinois |
| 46 | William Koch THIS PERSON | 17 | Son | Helper | Illinois |
| 47 | Frederick Koch | 14 | Son | — | Illinois |
| 48 | Clara Koch | 12 | Daughter | — | Illinois |
| 49 | John Corcoran | 44 | Head | Laborer | Illinois |
| 50 | Catherine Corcoran | 44 | Wife | — | Illinois |
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)