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John Koch — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Posey, Indiana
Our Model Tree links this John Koch across the 1920 and 1930 US Censuses in Posey, Indiana (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 6-person household.
Age 55
b. ~1875
Male
Head
Born: Indiana
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Posey, Indiana |
| Surname | Koch |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Indiana |
| Age at First Marriage | 22 |
| Father's Birthplace | Germany |
| Mother's Birthplace | France |
| Additional Details | |
| Occupation | Farmer |
| Industry | Grain farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 13 |
| Radio Set | R |
| Veteran | No |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Farmer |
| Township / Ward | Robb Township |
| Est. Birth Year | ~1875 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Charles Koch | Son | — | 17 | ~1913 |
| Martin Koch | Son | — | 19 | ~1911 |
| Mary Koch | Spouse | — | 54 | ~1876 |
| Mary Koch | Daughter | — | 14 | ~1916 |
| John Koch | Head | — | 55 | ~1875 |
| Joseph Koch | Son | — | 11 | ~1919 |
Census Appearances
1920
Posey, Indiana
Head, age 45
Posey, Indiana · implied b. ~1875 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Indiana |
| Father's Birthplace | Germany |
| Mother's Birthplace | Alsace Lorraine |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | Em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Posey, Indiana
Head, age 55
Posey, Indiana · implied b. ~1875 — 6 household members
| Surname | Koch |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Indiana |
| Age at First Marriage | 22 |
| Father's Birthplace | Germany |
| Mother's Birthplace | France |
| Occupation | Farmer |
| Industry | Grain farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 13 |
| Radio Set | R |
| Veteran | No |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 (1920 and 1930) in Posey, Indiana, using XGBoost record linkage.
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This person
Anchor record
John Koch
Head · 1930 · age 55 · b. ~1875 · Indiana
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Posey, Indiana
Open full size
1930 US Federal Census — Posey, Indiana
Page Contents
46 people indexed on this census page (ia:1930:indianacensus00reel622:1125)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Mahrenholz | 50 | Head | Farmer | Indiana |
| 2 | Herbert J Mahrenholz | 18 | Son | Laborer | Indiana |
| 3 | Ruth C Mahrenholz | 17 | Daughter | — | Indiana |
| 4 | Melza J Hanes | 44 | Head | Farmer | Indiana |
| 5 | Minnie E Hanes | 36 | Wife | Homemaker | Oklahoma |
| 6 | Tura J Hanes | 12 | Daughter | — | Indiana |
| 7 | Mary B Hanes | 10 | Daughter | — | Indiana |
| 8 | Walter E Craig | 52 | Head | Farmer | Indiana |
| 9 | Elizabeth R Craig | 51 | Wife | Homemaker | Indiana |
| 10 | Nolan V Craig | 29 | Son | Laborer | Indiana |
| 11 | Alice M Craig | 24 | Daughter | Homemaker | Indiana |
| 12 | Darrell L Craig | 21 | Son | Laborer | Indiana |
| 13 | Harrold Craig | 9 | Grandson | — | Indiana |
| 14 | Clarence Mahrenholz | 25 | Head | Farmer | Indiana |
| 15 | Meta L Mahrenholz | 23 | Wife | Homemaker | Indiana |
| 16 | Fred Mahrenholz | 52 | Head | Farmer | Indiana |
| 17 | Caroline Mahrenholz | 52 | Wife | Homemaker | Indiana |
| 18 | Otto Mahrenholz | 31 | Son | Laborer | Indiana |
| 19 | Katherine Mahrenholz | 25 | Daughter | Homemaker | Indiana |
| 20 | George L Jolly | 57 | Head | Laborer | Indiana |
| 21 | Lula Jolly | 50 | Wife | Laborer | Indiana |
| 22 | Clyde M Jolly | 17 | Son | Laborer | Indiana |
| 23 | Pearl B Jolly | 13 | Daughter | — | Illinois |
| 24 | Earl D Jolly | 13 | Son | — | Illinois |
| 25 | Thomas D Jolly | 10 | Son | — | Indiana |
| 26 | Jesse M Stilley | 39 | Head | Farmer | Indiana |
| 27 | Helen Stilley | 33 | Wife | Homemaker | Indiana |
| 28 | Martha C Stilley | 12 | Daughter | — | Indiana |
| 29 | Ruth Stilley | 9 | Daughter | — | Indiana |
| 30 | Thomas Ansley | 58 | Servant | Laborer | Indiana |
| 31 | John H Koch THIS PERSON | 55 | Head | Farmer | Indiana |
| 32 | Mary E Koch | 54 | Wife | Homemaker | Indiana |
| 33 | Martin Koch | 19 | Son | Laborer | Indiana |
| 34 | Charles Koch | 17 | Son | Laborer | Indiana |
| 35 | Mary Koch | 14 | Daughter | Homemaker | Indiana |
| 36 | Joseph Koch | 11 | Son | — | Indiana |
| 37 | Minor M Fairchild | 67 | Head | — | Indiana |
| 38 | Tillic Fairchild | 65 | Wife | Homemaker | Indiana |
| 39 | John Turehill | 32 | Head | Farmer | Indiana |
| 40 | Anna I Turehill | 27 | Wife | Homemaker | Indiana |
| 41 | Marian Turehill | 11 | Daughter | — | Indiana |
| 42 | Dorothy Turehill | 5 | Daughter | — | Indiana |
| 43 | August Mahrenholz | 60 | Head | Farmer | Indiana |
| 44 | Elizabeth Mahrenholz | 61 | Wife | Homemaker | Indiana |
| 45 | William H Gretfall | 72 | Head | — | Indiana |
| 46 | Edith M Gretfall | 65 | Sister | Homemaker | Indiana |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)