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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Winnebago-County, Wisconsin
Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Winnebago-County, Wisconsin (XGBoost, ~Confirmed) — first a son (b.~1910), then head of a 9-person household.
Age 30
b. ~1910
Male
Son
Born: Wisconsin
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Winnebago-County, Wisconsin |
| Surname | Koch |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Oshkosh City |
| 1935 Residence (County) | Winnebago |
| Additional Details | |
| Occupation | Lumber Piler |
| Industry | Lumber Mill |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 850 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Lumber Piler |
| Township / Ward | Oshkosh City |
| Est. Birth Year | ~1910 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Helen Koch | Daughter | — | 17 | ~1923 |
| Victor Koch | Son | — | 22 | ~1918 |
| John Koch | Son | — | 30 | ~1910 |
| Selma Koch | Daughter | — | 13 | ~1927 |
| John Koch | Head | — | 52 | ~1888 |
| Elizabeth Koch | Spouse | — | 49 | ~1891 |
| Violet Koch | Daughter | — | 20 | ~1920 |
| Sidney Koch | Son | — | 15 | ~1925 |
| Lucille Koch | Daughter | — | 11 | ~1929 |
Census Appearances
1930
Winnebago, Wisconsin
Son, age 20
Winnebago, Wisconsin · implied b. ~1910 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Occupation | Laborer |
| Industry | Auto Body Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Winnebago-County, Wisconsin
Son, age 30
Winnebago-County, Wisconsin · implied b. ~1910 — 9 household members
| Surname | Koch |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Oshkosh City |
| 1935 Residence (County) | Winnebago |
| Occupation | Lumber Piler |
| Industry | Lumber Mill |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 850 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 John Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Koch
Son · 1940 · age 30 · b. ~1910 · Wisconsin
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Sibling
Victor Koch
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Selma Koch
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Koch
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sidney Koch
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Violet Koch
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Koch
Sibling · 1940 · age 11
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
1940 US Federal Census — Winnebago-County, Wisconsin
Open full size
1940 US Federal Census — Winnebago-County, Wisconsin
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04539-00398)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ermgard Neubauer | 22 | Wife | — | Wisconsin |
| 42 | Edgar H Neubauer | 25 | Head | Weaver | Wisconsin |
| 43 | Caroline Neubauer | 25 | Wife | — | Wisconsin |
| 44 | Gerald Neubauer | 1 | Son | — | Wisconsin |
| 45 | Anna Luft | 71 | Head | — | Russia |
| 46 | John Hanneman | 34 | Head | Benchwork | Wisconsin |
| 47 | Amelia Hanneman | 33 | Wife | — | Wisconsin |
| 48 | Ronald Hanneman | 11 | Son | — | Wisconsin |
| 49 | Frank G Betts | 31 | Head | Mixer | Wisconsin |
| 50 | Josephine Betts | 24 | Wife | — | Wisconsin |
| 51 | Alex Farmer | 68 | Head | Laborer | Russia |
| 52 | Anna Farmer | 60 | Wife | — | Russia |
| 53 | John Koch | 52 | Head | — | Russia |
| 54 | Elizabeth Koch | 49 | Wife | — | Russia |
| 55 | John Jr Koch THIS PERSON | 30 | Son | Lumber Piler | Wisconsin |
| 56 | Victor Koch | 22 | Son | Lumber Piler | Wisconsin |
| 57 | Violet Koch | 20 | Daughter | Dryer | Wisconsin |
| 58 | Helen Koch | 17 | Daughter | — | Wisconsin |
| 59 | Sidney Koch | 15 | Son | — | Wisconsin |
| 60 | Selma Koch | 13 | Daughter | — | Wisconsin |
| 61 | Lucille Koch | 11 | Daughter | — | Wisconsin |
| 62 | John Stuhl | 42 | Head | Supply Man | Russia |
| 63 | Katherine Stuhl | 36 | Wife | Stock Feeder | Wisconsin |
| 64 | Geraldine Stuhl | 16 | Daughter | — | Wisconsin |
| 65 | Douglas Stuhl | 10 | Son | — | Wisconsin |
| 66 | Edward Luft | 34 | Head | Motor | Wisconsin |
| 67 | Helen Luft | 31 | Wife | — | Wisconsin |
| 68 | Alice Luft | 10 | Daughter | — | Wisconsin |
| 69 | Jacob Jordan | 33 | Head | Labour | Russia |
| 70 | Eva Jordan | 31 | Wife | — | Wisconsin |
| 71 | Berwin Jordan | 12 | Son | — | Wisconsin |
| 72 | Doris Jordan | 10 | Daughter | — | Wisconsin |
| 73 | Theodore J. Sunker | 51 | Head | Cutter | Germany |
| 74 | Matilda Sunker | 50 | Wife | — | Russia |
| 75 | William Sunker | 27 | Son | Machine App | Wisconsin |
| 76 | Theodore Jr Sunker | 22 | Son | Labour | Wisconsin |
| 77 | Edward Sunker | 20 | Son | Take Off Man | Wisconsin |
| 78 | Gustav O Puarig | 34 | Head | Sander | Wisconsin |
| 79 | Ann Puarig | 31 | Wife | Checking | New York |
| 80 | Rolf Puarig | 5 | Son | — | 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)