WK
William Koch — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Wayne, Michigan
Our Model Tree links this William Koch across the 1920 and 1930 US Censuses in Wayne, Michigan (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 6-person household.
Age 41
b. ~1889
Male
Head
Born: Germany
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Wayne, Michigan |
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Germany |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | Yes |
| Industry | Bricklayer |
| Class of Worker | Building |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1889 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Joseph Koch | Son | — | 10 | ~1920 |
| Mary Koch | Daughter | — | 18 | ~1912 |
| Mary Koch | Other | — | 36 | ~1894 |
| Elizabeth Koch | Daughter | — | 10 | ~1920 |
| William Koch | Head | — | 41 | ~1889 |
| Catherine Koch | Daughter | — | 15 | ~1915 |
Census Appearances
1920
Wayne, Michigan
Head, age 29
Wayne, Michigan · implied b. ~1891 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1910 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Janitor |
| Industry | Apt House |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Home Owned/Rented | R |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1930
Wayne, Michigan
Head, age 41
Wayne, Michigan · implied b. ~1889 — 6 household members
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Germany |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Yes |
| Industry | Bricklayer |
| Class of Worker | Building |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| 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 (1920 and 1930) in Wayne, Michigan, using XGBoost record linkage.
Show:
This person
Anchor record
William Koch
Head · 1930 · age 41 · b. ~1889 · Michigan
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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 — Wayne, Michigan
Open full size
1930 US Federal Census — Wayne, Michigan
Page Contents
50 people indexed on this census page (ia:1930:michigancensus00reel1066:0460)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Minnie Alexy | 54 | Head | — | Germany |
| 52 | Louise M Alexy | 23 | Daughter | Office Clerk | Michigan |
| 53 | Emil O Alexy | 29 | Head | Electrician | Michigan |
| 54 | Esther V Alexy | 24 | Wife-H | — | Michigan |
| 55 | Herbert R Alexy | 5 | Son | — | Michigan |
| 56 | Joseph Cook | 34 | Head | Toolmaker | Michigan |
| 57 | Adelaide Cook | 34 | Wife-H | — | Michigan |
| 58 | Pauline Cook | 13 | Daughter | — | Michigan |
| 59 | John M Lang | 48 | Head | Salesman | Michigan |
| 60 | Hazel Lang | 38 | Wife-H | — | Pennsylvania |
| 61 | Phil S Lang | 8 | Son | — | Michigan |
| 62 | Emory O Lang | 6 | Son | — | Michigan |
| 63 | Glad W Lang | 4 | Daughter | — | Michigan |
| 64 | Hans Korngehmidt | 48 | Head | Yes | Jugo Slavia |
| 65 | Mary Korngehmidt | 46 | Wife-H | Yes | Austria |
| 66 | Edward G Sufferlein | 54 | Head | Body Builder | Michigan |
| 67 | Minnie Sufferlein | 53 | Wife-H | — | Michigan |
| 68 | Fred Weber | 47 | Brother-in-law | Laborer | Michigan |
| 69 | Warner R Dick | 68 | Head | Yes | Germany |
| 70 | Hulda Dick | 65 | Wife-H | Yes | Germany |
| 71 | Lillian Dick | 41 | Daughter | Industrial Nurse | Michigan |
| 72 | Charles W Howard | 28 | Head | Salesman | Michigan |
| 73 | Theodore Howard | 23 | Wife-H | — | Michigan |
| 74 | Marilyn Howard | 2 | Daughter | — | Michigan |
| 75 | Charles B Howard | 0 | Son | — | Michigan |
| 76 | John R Doucet | 44 | Head | Yes | Canada-French |
| 77 | Sadie H Doucet | 37 | Wife-H | — | Massachusetts |
| 78 | Eileen Doucet | 11 | Daughter | — | Michigan |
| 79 | Dorothy Doucet | 9 | Daughter | — | Michigan |
| 80 | Marion Doucet | 7 | Daughter | — | Michigan |
| 81 | James G O'Neill | 30 | Head | Foreman Factory | Massachusetts |
| 82 | Harriett O'Neill | 32 | Wife-H | Yes | Norway |
| 83 | William Koch THIS PERSON | 41 | Head | Yes | Germany |
| 84 | Mary Koch | 36 | Wife-H | Yes | Austria |
| 85 | Mary Koch | 18 | Daughter | — | Michigan |
| 86 | Catherine Koch | 15 | Daughter | — | Michigan |
| 87 | Joseph Koch | 10 | Son | — | Michigan |
| 88 | Elizabeth Koch | 10 | Daughter | — | Michigan |
| 89 | Henry A O'Bryan | 53 | Head | Laborer | Kentucky |
| 90 | Lucy O'Bryan | 50 | Wife-H | — | Kentucky |
| 91 | Jasper R O'Bryan | 25 | Son | Laborer | Missouri |
| 92 | Evelyn O'Bryan | 22 | Daughter | Stenographer | Missouri |
| 93 | Ivy B O'Bryan | 18 | Daughter | — | Michigan |
| 94 | Grace O'Bryan | 16 | Daughter | — | Michigan |
| 95 | Albert O'Bryan | 14 | Son | — | Michigan |
| 96 | Clifford Kuhle | 21 | Son-in-law | Laborer | Michigan |
| 97 | Margaret Kuhle | 20 | Daughter | — | Missouri |
| 98 | Virginia O'Bryan | 11 | Daughter | — | Michigan |
| 99 | Helen O'Bryan | 10 | Daughter | — | Missouri |
| 100 | Patricia O'Bryan | 7 | Daughter | — | Michigan |
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)