WK
William Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Genesee-County, Michigan
Our Model Tree links this William Koch across the 1930 and 1940 US Censuses in Genesee-County, Michigan (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 10-person household.
Age 51
b. ~1889
Male
Head
Born: Germany
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Genesee-County, Michigan |
| Surname | Koch |
| Given Name | William F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Flint city |
| 1935 Residence (County) | Genesee |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Labor |
| Industry | Auto Factory |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1600 |
| Highest Grade | H 3 |
| 1935 Residence | Same House |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Occupation | Labor |
| Township / Ward | Flint 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Frank Ferguson | Other | — | 47 | ~1893 |
| William Koch | Son | — | 14 | ~1926 |
| Elsie Koch | Daughter | — | 18 | ~1922 |
| William Koch | Head | — | 51 | ~1889 |
| Mabel Koch | Daughter | — | 11 | ~1929 |
| Marion Koch | Daughter | — | 20 | ~1920 |
| Dorothy Koch | Daughter | — | 7 | ~1933 |
| Alma Koch | Spouse | — | 40 | ~1900 |
| Arnold Koch | Son | — | 5 | ~1935 |
| Helen Koch | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Genesee, Michigan
Head, age 42
Genesee, Michigan · implied b. ~1888 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kock |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1912 |
| Age at First Marriage | 31 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Production |
| Industry | Auto factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 3900 |
| Veteran | No |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Genesee-County, Michigan
Head, age 51
Genesee-County, Michigan · implied b. ~1889 — 10 household members
| Surname | Koch |
| Given Name | William F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Flint city |
| 1935 Residence (County) | Genesee |
| Naturalization Status | Naturalized |
| Occupation | Labor |
| Industry | Auto Factory |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1600 |
| Highest Grade | H 3 |
| 1935 Residence | Same House |
| 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.
Show:
This person
Anchor record
William Koch
Head · 1940 · age 51 · b. ~1889 · Michigan
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Genesee-County, Michigan
Open full size
1940 US Federal Census — Genesee-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01893-00471)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Junior W Frost | 17 | Son | Labor | Michigan |
| 2 | Evelyn E Frost | 15 | Daughter | — | Michigan |
| 3 | Betty A Frost | 13 | Daughter | — | Michigan |
| 4 | Florence J Frost | 12 | Daughter | — | Michigan |
| 5 | Shirley L Frost | 10 | Daughter | — | Michigan |
| 6 | Patricia G Frost | 8 | Daughter | — | Michigan |
| 7 | Gerald R Frost | 7 | Son | — | Michigan |
| 8 | Thomas Frost | 4 | Son | — | Michigan |
| 9 | Katherine D Frost | 5 | Daughter | — | Michigan |
| 10 | Charles D Frost | 2 | Son | — | Michigan |
| 11 | Bryan Culberton | 45 | Head | Labor | Michigan |
| 12 | Mildred M Culberton | 46 | Wife | — | Michigan |
| 13 | Sue A Culberton | 2 | Daughter | — | Michigan |
| 14 | Harold A De May | 25 | Head | Truck Driver | Michigan |
| 15 | Emma C De May | 46 | Wife | — | Pennsylvania |
| 16 | William E Lockard | 22 | Head | Labor | Michigan |
| 17 | Mary Lockard | 47 | Mother | — | Bohemian |
| 18 | Stilt | 52 | Lodger | — | — |
| 19 | Marjorie Beechler | 28 | Lodger | Labor | Michigan |
| 20 | Martin A Lockard | 20 | Brother | Superintendent Clerk | Michigan |
| 21 | Martha M Lockard | 11 | Sister | — | New York |
| 22 | William A Larue | 50 | Lodger | Labor | Ohio |
| 23 | William F Koch THIS PERSON | 51 | Head | Labor | Germany |
| 24 | Alma A Koch | 40 | Wife | — | Minnesota |
| 25 | Marion E Koch | 20 | Daughter | Bookkeeper | Minnesota |
| 26 | Elsie A Koch | 18 | Daughter | Bookkeeper | North Dakota |
| 27 | Helen F Koch | 16 | Daughter | — | North Dakota |
| 28 | William C Koch | 14 | Son | — | Indiana |
| 29 | Mabel L Koch | 11 | Daughter | — | Michigan |
| 30 | Dorothy A Koch | 7 | Daughter | — | Michigan |
| 31 | Arnold J Koch | 5 | Son | — | Michigan |
| 32 | Frank M Ferguson | 47 | Lodger | Labor | Michigan |
| 33 | John R Lawrence | 52 | Head | Labor | Michigan |
| 34 | Lillian M Lawrence | 50 | Wife | — | Michigan |
| 35 | Anna A Moran | 54 | Head | — | Michigan |
| 36 | Robert E Moran | 24 | Son | Clerical | Michigan |
| 37 | Mary E Moran | 21 | Daughter in law | — | Michigan |
| 38 | Coleman P Taylor | 22 | Nephew | Truck Driver | North Dakota |
| 39 | Clifford M Folks | 17 | Lodger | — | Michigan |
| 40 | Robert Farquharson | 16 | Lodger | Labor | Michigan |
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)