WK
William Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Manitowoc-County, Wisconsin
Our Model Tree links this William Koch across the 1930 and 1940 US Censuses in Manitowoc-County, Wisconsin (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 5-person household.
Age 58
b. ~1882
Male
Head
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Manitowoc-County, Wisconsin |
| Surname | Koch |
| Given Name | William F. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Maple Grove Town |
| 1935 Residence (County) | Manitowoc |
| Additional Details | |
| Occupation | farming |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Farming |
| Township / Ward | Maple Grove Town |
| Est. Birth Year | ~1882 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Koch | Head | — | 58 | ~1882 |
| Kenneth Koch | Son | — | 17 | ~1923 |
| Junior Koch | Son | — | 14 | ~1926 |
| Grace Koch | Daughter | — | 11 | ~1929 |
| Clara Koch | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Manitowoc, Wisconsin
Other, age 49
Manitowoc, Wisconsin · implied b. ~1881 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | William F. |
| Relationship to Head | O |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 31 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Wisconsin |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Radio Set | R |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Manitowoc-County, Wisconsin
Head, age 58
Manitowoc-County, Wisconsin · implied b. ~1882 — 5 household members
| Surname | Koch |
| Given Name | William F. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Maple Grove Town |
| 1935 Residence (County) | Manitowoc |
| Occupation | farming |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Koch
Head · 1940 · age 58 · b. ~1882 · Wisconsin
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Manitowoc-County, Wisconsin
Open full size
1940 US Federal Census — Manitowoc-County, Wisconsin
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04495-00110)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Dvorchek | 23 | son | Machinist | Wisconsin |
| 2 | Anthony Dvorchek | 21 | son | Farm Laborer | Wisconsin |
| 3 | Emil Dvorchek | 19 | son | Farm Hand | Wisconsin |
| 4 | William F. Koch THIS PERSON | 58 | head | Farming | Wisconsin |
| 5 | Clara Koch | 48 | wife | — | Wisconsin |
| 6 | Kenneth Koch | 17 | son | Farm Hand | Wisconsin |
| 7 | Junior Koch | 14 | son | — | Wisconsin |
| 8 | Grace Koch | 11 | daughter | — | Wisconsin |
| 9 | Charles Bohlmann | 78 | head | Farming | Germany |
| 10 | Mathilda Bohlmann | 73 | wife | — | Germany |
| 11 | Henry Bohlmann | 53 | son | — | Wisconsin |
| 12 | John Bohlmann | 50 | son | — | Wisconsin |
| 13 | Harry Bohlmann | 45 | son | Farm Laborer | Wisconsin |
| 14 | Emma Bohlmann | 43 | daughter | House Maid | Wisconsin |
| 15 | Leonhard Bohlmann | 37 | son | Farm Hand | Wisconsin |
| 16 | Fred Ebert | 60 | head | Farming | Wisconsin |
| 17 | Ida Ebert | 56 | wife | — | Wisconsin |
| 18 | Herbert Ebert | 30 | son | Farm Laborer | Wisconsin |
| 19 | Georgiaqua Ebert | 14 | daughter | House Maid | Wisconsin |
| 20 | Walter Herzog | 38 | head | Farming | Wisconsin |
| 21 | Laura Herzog | 33 | wife | — | Wisconsin |
| 22 | Guron Herzog | 11 | son | — | Wisconsin |
| 23 | Betty Jane Herzog | 8 | daughter | — | Wisconsin |
| 24 | Albin Dickert | 36 | laborer | Farm Laborer | Wisconsin |
| 25 | Clement H. Miller | 24 | head | Farming | Wisconsin |
| 26 | Anna Miller | 26 | sister | House Keeper | Wisconsin |
| 27 | Audrey Miller | 1 | niece | — | Wisconsin |
| 28 | John Kocourek | 60 | head | Farming | Wisconsin |
| 29 | Rose Kocourek | 49 | wife | — | Wisconsin |
| 30 | Clarence Kocourek | 21 | son | Farm Laborer | Wisconsin |
| 31 | Harold Kocourek | 18 | son | Farm Hand | Wisconsin |
| 32 | John Kocourek | 16 | son | — | Wisconsin |
| 33 | Lester Kocourek | 14 | son | — | Wisconsin |
| 34 | Ralph Kocourek | 12 | son | — | Wisconsin |
| 35 | Rose Mary Kocourek | 9 | daughter | — | Wisconsin |
| 36 | Betty Kocourek | 8 | daughter | — | Wisconsin |
| 37 | Elroy Kocourek | 6 | son | — | Wisconsin |
| 38 | Albert Prochnow | 60 | head | Farming | Wisconsin |
| 39 | Emma Prochnow | 56 | wife | — | Wisconsin |
| 40 | Elroy Brandes | 18 | laborer | Farm Laborer | Wisconsin |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)