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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dane-County, Wisconsin
Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Dane-County, Wisconsin (XGBoost, ~Confirmed) — first a head (b.~1900), then head of a 8-person household.
Age 40
b. ~1900
Male
Head
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dane-County, Wisconsin |
| Surname | Koch |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Vienna township |
| 1935 Residence (County) | Dane |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 90 |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same house |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Farmer |
| Township / Ward | Vienna Township |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Koch | Daughter | — | 15 | ~1925 |
| Martin Koch | Son | — | 5 | ~1935 |
| Dolores Koch | Daughter | — | 10 | ~1930 |
| John Koch | Head | — | 40 | ~1900 |
| Lucile Koch | Daughter | — | 6 | ~1934 |
| Anna Koch | Spouse | — | 40 | ~1900 |
| John Koch | Son | — | 7 | ~1933 |
| Anne Koch | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Dane, Wisconsin
Head, age 30
Dane, Wisconsin · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 23 |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Dane-County, Wisconsin
Head, age 40
Dane-County, Wisconsin · implied b. ~1900 — 8 household members
| Surname | Koch |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Vienna township |
| 1935 Residence (County) | Dane |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 90 |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 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
Head · 1940 · age 40 · b. ~1900 · Wisconsin
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Dane-County, Wisconsin
Open full size
1940 US Federal Census — Dane-County, Wisconsin
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04471-00701)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Harold G. Erickson | 19 | Son | Farm Laborer | Wisconsin |
| 42 | Lorraine D. Erickson | 17 | Daughter | — | Wisconsin |
| 43 | John A. Rohrbeck | 25 | Hired hand | Farm Laborer | Wisconsin |
| 44 | Hans C. Paulson | 61 | Head | Farmer | Norway |
| 45 | Gunhild Paulson | 57 | Wife | — | Norway |
| 46 | Sigurd D. Paulson | 25 | Son | Farm Laborer | Wisconsin |
| 47 | Florence E. Paulson | 21 | Daughter | — | Wisconsin |
| 48 | Josias J. Johnson | 45 | Head | Farmer | Wisconsin |
| 49 | Clara J. Johnson | 34 | Wife | — | Wisconsin |
| 50 | Jeanette C. Johnson | 14 | Daughter | — | Wisconsin |
| 51 | Edward N. Johnson | 11 | Son | — | Wisconsin |
| 52 | La Verne D. Johnson | 9 | Son | — | Wisconsin |
| 53 | Elmore A. Johnson | 5 | Daughter | — | Wisconsin |
| 54 | Bette L. Johnson | 2 | Daughter | — | Wisconsin |
| 55 | Josias J. Johnson | 0 | Son | — | Wisconsin |
| 56 | Julius J. Davidson | 48 | Head | Farmer | Wisconsin |
| 57 | Rosella A. Davidson | 42 | Wife | — | Wisconsin |
| 58 | Allie J. Davidson | 17 | Son | Farm Laborer | Wisconsin |
| 59 | Dorothy M. Davidson | 15 | Daughter | — | Wisconsin |
| 60 | Marie M. Davidson | 10 | Daughter | — | Wisconsin |
| 61 | Olin B. Sveum | 39 | Head | Farmer | Wisconsin |
| 62 | Anna Sveum | 45 | Wife | — | Wisconsin |
| 63 | Ruth B. Sveum | 16 | Daughter | — | Wisconsin |
| 64 | Kenneth Colby | 23 | Hired hand | Farm Laborer | Wisconsin |
| 65 | Eugene T. Bowers | 46 | Head | Farmer | Wisconsin |
| 66 | Alice C. Bowers | 48 | Wife | — | Wisconsin |
| 67 | Benny A. Bowers | 23 | Son | Farm Laborer | Wisconsin |
| 68 | Alvin J. Benisch | 35 | Head | Farm Laborer | Wisconsin |
| 69 | Hettie M. Benisch | 34 | Wife | — | Wisconsin |
| 70 | Herbert G. Benisch | 3 | Son | — | Wisconsin |
| 71 | Carol A. Benisch | 2 | Daughter | — | Wisconsin |
| 72 | Ruth H. Benisch | 0 | Daughter | — | Wisconsin |
| 73 | John L. Koch THIS PERSON | 40 | Head | Farmer | Wisconsin |
| 74 | Anna S. Koch | 40 | Wife | — | Wisconsin |
| 75 | Dorothy J. Koch | 15 | Daughter | — | Wisconsin |
| 76 | Anne M. Koch | 12 | Daughter | — | Wisconsin |
| 77 | Dolores R. Koch | 10 | Daughter | — | Wisconsin |
| 78 | John R. Koch | 7 | Son | — | Wisconsin |
| 79 | Lucile A. Koch | 6 | Daughter | — | Wisconsin |
| 80 | Martin A. Koch | 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)