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William Koch — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Jones, Iowa
Our Model Tree links this William Koch across the 1930 and 1940 US Censuses in Jones, Iowa (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 5-person household.
Age 65
b. ~1865
Male
Head
Born: Germany
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Jones, Iowa |
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1872 |
| Age at First Marriage | 35 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 1200 |
| Veteran | No |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Occupation | Farmer |
| Township / Ward | Wyoming Township |
| Est. Birth Year | ~1865 |
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 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Koch | Head | — | 65 | ~1865 |
| Henry Koch | Son | — | 26 | ~1904 |
| John Koch | Son | — | 22 | ~1908 |
| Bertha Koch | Spouse | — | 58 | ~1872 |
| Henry Grimm | Other | — | 56 | ~1874 |
Census Appearances
1930
Jones, Iowa
Head, age 65
Jones, Iowa · implied b. ~1865 — 5 household members
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1872 |
| Age at First Marriage | 35 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 1200 |
| Veteran | No |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Jones-County, Iowa
Head, age 71
Jones-County, Iowa · implied b. ~1869 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kock |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 71 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Wyoming Township |
| 1935 Residence (County) | Jones |
| Naturalization Status | Naturalized |
| Occupation | Farming |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
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.
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This person
Anchor record
William Koch
Head · 1930 · age 65 · b. ~1865 · Iowa
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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 — Jones, Iowa
Open full size
1930 US Federal Census — Jones, Iowa
Page Contents
26 people indexed on this census page (ia:1930:iowacensus00reel662:0535)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Mary Jane Benson | 9 | Daughter | — | Iowa |
| 52 | Charlene Benson | 7 | Daughter | — | Iowa |
| 53 | Lawrence Benson | 34 | Step son | Partner | Iowa |
| 54 | Martin Petersen | 36 | Head | Farmer | Germany |
| 55 | Christiana Petersen | 30 | Wife | — | Iowa |
| 56 | Louis Petersen | 8 | Son | — | Iowa |
| 57 | Melvin Petersen | 3 | Son | — | Iowa |
| 58 | Dale Petersen | 0 | Son | — | Iowa |
| 59 | William Koch THIS PERSON | 65 | Head | Farmer | Germany |
| 60 | Bertha Koch | 58 | Wife | — | Iowa |
| 61 | Henry Koch | 26 | Son | Laborer | Iowa |
| 62 | John Koch | 22 | Son | Laborer | Iowa |
| 63 | Henry Grimm | 56 | Brother-in-law | — | Iowa |
| 64 | Carl Westphal | 44 | Head | Farmer | Iowa |
| 65 | Carlina Westphal | 46 | Wife | — | Iowa |
| 66 | Glenn Westphal | 15 | Son | — | Iowa |
| 67 | August Carstensen | 57 | Head | Farmer | Germany |
| 68 | Cathrina Carstensen | 49 | Wife | — | Iowa |
| 69 | Emma Carstensen | 27 | Daughter | Saleslady | Iowa |
| 70 | Bertha Carstensen | 25 | Daughter | — | Iowa |
| 71 | Herman Carstensen | 23 | Son | Laborer | Iowa |
| 72 | Martin Carstensen | 21 | Son | Laborer | Iowa |
| 73 | Minna Carstensen | 19 | Daughter | — | Iowa |
| 74 | Joseph Carstensen | 17 | Son | Laborer | Iowa |
| 75 | August Jr. Carstensen | 15 | Son | — | Iowa |
| 76 | Dora Carstensen | 10 | Daughter | — | Iowa |
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)