WD
William Decker — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Washington-County, Illinois
Our Model Tree links this William Decker across the 1920, 1930 and 1940 US Censuses in Washington-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1881), then head of a 4-person household.
Age 59
b. ~1881
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Washington-County, Illinois |
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Pilot Knob Twp |
| 1935 Residence (County) | Washington |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 452 |
| Highest Grade | No 4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Pilot Knob Twp |
| Est. Birth Year | ~1881 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Decker | Head | — | 59 | ~1881 |
| Alvina Decker | Spouse | — | 65 | ~1875 |
| Elwood Decker | Son | — | 25 | ~1915 |
| Nola Decker | Other | — | 23 | ~1917 |
Census Appearances
1920
Washington, Illinois
Head, age 38
Washington, Illinois · implied b. ~1882 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | Em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Washington, Illinois
Head, age 48
Washington, Illinois · implied b. ~1882 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 29 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Washington-County, Illinois
Head, age 59
Washington-County, Illinois · implied b. ~1881 — 4 household members
| Surname | Decker |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Pilot Knob Twp |
| 1935 Residence (County) | Washington |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 452 |
| Highest Grade | No 4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Decker 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 Decker
Head · 1940 · age 59 · b. ~1881 · Illinois
★ 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 — Washington-County, Illinois
Open full size
1940 US Federal Census — Washington-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00902-00426)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Raymond Zapp | 11 | Son | — | Illinois |
| 2 | Kenneth Zapp | 8 | Son | — | Illinois |
| 3 | Mary Della Zapp | 5 | Daughter | — | Illinois |
| 4 | Lee Decker | 53 | Head | Farmer | Illinois |
| 5 | Edith Decker | 42 | Wife | — | Illinois |
| 6 | Ruby Decker | 19 | Daughter | — | Illinois |
| 7 | Vernon Decker | 16 | Son | Farm Helper | Illinois |
| 8 | William Stonum | 62 | Head | Farmer | Illinois |
| 9 | Angie Stonum | 53 | Wife | — | Illinois |
| 10 | Kathrine Stonum | 13 | Daughter | — | Illinois |
| 11 | Geneva Smith | 14 | Daughter | — | Illinois |
| 12 | Barney Barczewski | 48 | Head | Farm Helper | Illinois |
| 13 | Irene Barczewski | 19 | Daughter | — | Illinois |
| 14 | Walter Heggemeier | 54 | Head | Farmer | Illinois |
| 15 | Minnie Heggemeier | 51 | Wife | — | Illinois |
| 16 | Leroy Heggemeier | 21 | Son | Farm Helper | Illinois |
| 17 | Dorothy Heggemeier | 15 | Daughter | — | Illinois |
| 18 | Nettie Hardekopf | 37 | Head | — | Illinois |
| 19 | Earl Cook | 11 | Son | — | Illinois |
| 20 | William Decker THIS PERSON | 59 | Head | Farmer | Illinois |
| 21 | Alvina Decker | 65 | Wife | — | Illinois |
| 22 | Elwood Decker | 25 | Son | Farm Helper | Illinois |
| 23 | Nola Decker | 23 | In-law | — | Illinois |
| 24 | Charles Karoleski | 52 | Head | Farmer | Illinois |
| 25 | Fred Beckman | 59 | Head | Farmer | Illinois |
| 26 | Martha Beckman | 54 | Wife | — | Illinois |
| 27 | Talitha Beckman | 17 | Daughter | — | Illinois |
| 28 | F. Palmer Beckman | 15 | Son | — | Illinois |
| 29 | Doris Beckman | 11 | Daughter | — | Illinois |
| 30 | Albert Beckman | 55 | Head | — | Illinois |
| 31 | Emma Beckman | 51 | Wife | — | Illinois |
| 32 | Alfred Weise | 29 | Head | Farmer | Illinois |
| 33 | Nora Weise | 30 | Wife | — | Illinois |
| 34 | Lloyd Weise | 6 | Son | — | Illinois |
| 35 | Lester Weise | 2 | Son | — | Illinois |
| 36 | William Weise | 68 | Uncle | Farm Helper | Illinois |
| 37 | Elmer Eigenrauch | 35 | Head | Farmer | Illinois |
| 38 | Lillie Eigenrauch | 34 | Wife | — | Illinois |
| 39 | Helen Eigenrauch | 12 | Daughter | — | Illinois |
| 40 | Darlene Eigenrauch | 10 | Daughter | — | Illinois |
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)