WK
William Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this William Koch across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a head (b.~1874), then head of a 3-person household.
Age 66
b. ~1874
Male
Head
Born: Germany
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Brooklyn Borough |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Repairer |
| Industry | Wholesale Woolen Mill |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 400 |
| Highest Grade | H 1 |
| 1935 Residence | Same Place |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Occupation | Repairer |
| Township / Ward | Brooklyn Borough |
| Est. Birth Year | ~1874 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Anna Koch | Spouse | — | 62 | ~1878 |
| William Koch | Head | — | 66 | ~1874 |
| William Koch | Son | — | 32 | ~1908 |
Census Appearances
1920
Kings, New …
Head, age 47
Kings, New York · implied b. ~1873 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1874 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Manager |
| Industry | Music Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Home Owned/Rented | R |
| Birth Country | Germany |
| Year of Naturalization | 1895 |
| Birthplace (normalized) | germany |
1930
Kings, New …
Head, age 58
Kings, New York · implied b. ~1872 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1882 |
| Age at First Marriage | 34 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Industry | Music Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | R |
| Home Value / Rent | 32.00 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1940
Kings-County, New …
Head, age 66
Kings-County, New York · implied b. ~1874 — 3 household members
| Surname | Koch |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Germany |
| 1935 Residence (City) | Brooklyn Borough |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Occupation | Repairer |
| Industry | Wholesale Woolen Mill |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 400 |
| Highest Grade | H 1 |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Koch
Head · 1940 · age 66 · b. ~1874 · New York
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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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02575-00614)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry Mcgrath | 65 | Head | Supervisor | New York |
| 2 | Emma Mcgrath | 64 | Wife | — | New York |
| 3 | John Buffa | 46 | Head | Foreman | Italy |
| 4 | Frances Buffa | 39 | Wife | — | Italy |
| 5 | Theresa Buffa | 7 | Daughter | — | New York |
| 6 | Michael Anthony | 59 | Head | Attendant | Rhode Island |
| 7 | Margaret Anthony | 51 | Wife | Stock Clerk | Rhode Island |
| 8 | Frances C. Anthony | 48 | Sister | — | Rhode Island |
| 9 | Ole J. Hausken | 50 | Head | Master Mariner | Norway |
| 10 | Marie Hausken | 50 | Wife | — | Norway |
| 11 | Arnold Hausken | 24 | Son | Sailor | New York |
| 12 | William Koch THIS PERSON | 66 | Head | Repairer | Germany |
| 13 | Anna Koch | 62 | Wife | — | New York |
| 14 | William Charles Koch | 32 | Son | Salesman | New York |
| 15 | Harry Daken | 44 | Head | Repairer | Russia |
| 16 | Sylvia Daken | 31 | Wife | — | New York |
| 17 | Marjorie Daken | 9 | Daughter | — | New York |
| 18 | Bertha Wallner | 58 | Mother in law | — | Germany |
| 19 | Emanuel Kassen | 49 | Head | Accountant | Denmark |
| 20 | Edythe Kassen | 45 | Wife | — | New Jersey |
| 21 | Patricia Kassen | 14 | Daughter | — | New York |
| 22 | Louise Kassen | 12 | Daughter | — | New York |
| 23 | Oscar Larsen | 78 | Head | Carpenter | Denmark |
| 24 | Adolphine Larsen | 76 | Wife | — | Denmark |
| 25 | Josephine Dimino | 69 | Head | — | Italy |
| 26 | Salvatore Dimino | 24 | Son | Salesman | New York |
| 27 | Jessie Dimino | 22 | Daughter | — | New York |
| 28 | Rita Dimino | 20 | Daughter | New Worker | New York |
| 29 | Mary Dimino | 17 | Daughter | — | New York |
| 30 | Michael Dimino | 30 | Son | Salesman | New York |
| 31 | Fay Dimino | 22 | Daughter in law | — | Connecticut |
| 32 | Dimino | 3 | Grand son | — | New York |
| 33 | Salvatore Scarfani | 35 | Head | Merchant | New York |
| 34 | Lillian Scarfani | 28 | Wife | — | New York |
| 35 | Catherine Scarfani | 11 | Daughter | — | New York |
| 36 | Josephine Scarfani | 8 | Daughter | — | New York |
| 37 | Anthony Canale | 42 | Head | Handyman | New York |
| 38 | Dorothy Canale | 34 | Wife | — | New York |
| 39 | Lorepa Canale | 12 | Son | — | New York |
| 40 | Madeline Canale | 40 | Sister | Dressmaker | New York |
Related Census Records
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)