JK
John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Koch across the 1920, 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 7-person household.
Age 58
b. ~1882
Male
Head
Born: Germany
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Detroit |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Moulder |
| Industry | Foundry |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | No 5 |
| 1935 Residence | Same house |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Occupation | Moulder |
| Township / Ward | Detroit |
| Est. Birth Year | ~1882 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Anna Koch | Spouse | — | 53 | ~1887 |
| John Koch | Head | — | 58 | ~1882 |
| Raymond Dumpley | Other | — | 26 | ~1914 |
| Lillian Dumpley | Daughter | — | 31 | ~1909 |
| Vera Koch | Daughter | — | 22 | ~1918 |
| Richard Dumpley | Other | — | 9 | ~1931 |
| Raymond Koch | Son | — | 25 | ~1915 |
Census Appearances
1920
Oakland, Michigan
Head, age 36
Oakland, Michigan · implied b. ~1884 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1884 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Moulder |
| Industry | Auto factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1930
Wayne, Michigan
Head, age 47
Wayne, Michigan · implied b. ~1883 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Germany |
| Age at First Marriage | 25 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Moulder |
| Industry | Aluminum Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 3500 |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Wayne-County, Michigan
Head, age 58
Wayne-County, Michigan · implied b. ~1882 — 7 household members
| Surname | Koch |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Detroit |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Occupation | Moulder |
| Industry | Foundry |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | No 5 |
| 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 John Koch across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Koch
Head · 1940 · age 58 · b. ~1882 · Michigan
★ 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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01869-00518)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carl Hannaford | 47 | Head | Pattern Maker | Michigan |
| 2 | Beryl Hannaford | 44 | Wife | — | Michigan |
| 3 | Donald Hannaford | 20 | Son | Commercial Artist | Michigan |
| 4 | Anthony Bobrowski | 63 | Head | — | Germany |
| 5 | Mary Bobrowski | 64 | Wife | — | Germany |
| 6 | John Bobrowski | 35 | Son | Clipper | Michigan |
| 7 | Addie Bobrowski | 31 | Son | Assembler | Michigan |
| 8 | John Koch THIS PERSON | 58 | Head | Moulder | Germany |
| 9 | Anna Koch | 53 | Wife | — | Michigan |
| 10 | Raymond Koch | 25 | Son | Buffer | Michigan |
| 11 | Vera Koch | 22 | Daughter | Maid | Michigan |
| 12 | Lillian Dumpley | 31 | Daughter | — | Michigan |
| 13 | Raymond Dumpley | 26 | Son-in-law | Stock Clerk | New York |
| 14 | Richard Dumpley | 9 | Grand-son | — | Michigan |
| 15 | Harold E. Johnson | 44 | Head | Police Officer | Canada |
| 16 | Ethel Johnson | 44 | Wife | — | Canada |
| 17 | Almira E. Johnson | 17 | Daughter | — | Michigan |
| 18 | Carrie E. Johnson | 16 | Daughter | — | Michigan |
| 19 | Dorothy E. Johnson | 14 | Daughter | — | Michigan |
| 20 | Joseph E. Johnson | 10 | Son | — | Michigan |
| 21 | H. Evan Johnson | 7 | Son | — | Michigan |
| 22 | Raymond Bacon | 54 | Head | Awning Hanger | Ohio |
| 23 | Nellie Bacon | 52 | Wife | Office Worker | Ohio |
| 24 | Raymond Bacon | 17 | Son | Office Worker | Michigan |
| 25 | John Bacon | 15 | Son | — | Michigan |
| 26 | Charles Bacon | 12 | Son | — | Michigan |
| 27 | Victor Cooper | 40 | Head | Supervisor | England |
| 28 | Dorothy Cooper | 39 | Wife | — | England |
| 29 | Victoria Cooper | 66 | Mother | — | England |
| 30 | J. H. Sabin | 63 | Head | — | England |
| 31 | Eleanor P. Sabin | 62 | Wife | — | Minnesota |
| 32 | Robert H. Stridiron | 43 | Head | Mechanical Engineer | Michigan |
| 33 | Gertrude Stridiron | 35 | Wife | — | New York |
| 34 | William Boak | 13 | Son | — | Michigan |
| 35 | Walter Kompsanski | 21 | Head | Shipper | Michigan |
| 36 | Olga Kompsanski | 15 | Wife | — | Michigan |
| 37 | Joseph Perrica | 32 | Head | Polisher | Italy |
| 38 | Leona Perrica | 29 | Wife | — | Michigan |
| 39 | Janet Perrica | 5 | Daughter | — | Michigan |
| 40 | Delores J. Perrica | 1 | Daughter | — | 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)