WD
William Decker — 1940 US Census Record
Model Tree available1940 United States Federal Census · Scott-County, Iowa
Our Model Tree links this William Decker across the 1920, 1930 and 1940 US Censuses in Scott-County, Iowa (XGBoost, ~Confirmed), with identified parents Herman & Samuel — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Scott-County, Iowa |
| Surname | Decker |
| Given Name | William S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Additional Details | |
| Hours Worked | 12 |
| Income (1939) | 240 |
| Highest Grade | C-3 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Davenport City |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Richard Decker | Son | — | 16 | ~1924 |
| Flora Decker | Spouse | — | 47 | ~1893 |
| William Decker | Son | — | 21 | ~1919 |
| Herman Decker | Head | — | 54 | ~1886 |
Census Appearances
1920
Scott, Iowa
Son, age
Scott, Iowa · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | William B |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Iowa |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Scott, Iowa
Son, age 11
Scott, Iowa · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Decker |
| Given Name | William L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Scott-County, Iowa
Son, age 21
Scott-County, Iowa · implied b. ~1919 — 4 household members
| Surname | Decker |
| Given Name | William S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Davenport City |
| 1935 Residence (County) | Scott |
| Hours Worked | 12 |
| Income (1939) | 240 |
| Highest Grade | C-3 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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. Identified parents: father Herman Decker (~0.92 confidence) and father Samuel Moorhead (~0.92 confidence) and mother Flora Decker (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Herman Decker
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Samuel Moorhead
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Flora Decker
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Decker
Son · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Richard Decker
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Scott-County, Iowa
Open full size
1940 US Federal Census — Scott-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01203-00386)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Stein | 24 | Head | Machine Operator | Iowa |
| 2 | Marian Stein | 24 | Wife | — | Iowa |
| 3 | Alma Knaack | 47 | Mother | — | Iowa |
| 4 | Charlotte Aalye | 15 | Sister | — | Iowa |
| 5 | Herman W. Decker | 54 | Head | Asst. Salesman | Indiana |
| 6 | Flora Decker | 47 | Wife | — | Iowa |
| 7 | William S. Decker THIS PERSON | 21 | Son | — | Indiana |
| 8 | Richard D. Decker | 16 | Son | — | Iowa |
| 9 | Samuel H. Moorhead | 78 | Head | — | Iowa |
| 10 | Mayme R. Moorhead | 54 | Wife | — | Kansas |
| 11 | Martha M. Fitzpatrick | 23 | Lodger | Social Worker | Iowa |
| 12 | Hollis E. Parker | 35 | Lodger | Dentist | Iowa |
| 13 | Edmond H. Carroll | 40 | Head | Dentist | Iowa |
| 14 | Eileen Carroll | 39 | Wife | — | Iowa |
| 15 | Edmond Jr. Carroll | 13 | Son | — | Iowa |
| 16 | Mary Carroll | 9 | Daughter | — | Iowa |
| 17 | Jule H. Kerker | 63 | Head | Part Owner | Iowa |
| 18 | Bessie D. Kerker | 63 | Wife | — | Ohio |
| 19 | Carl A. Stoelting | 49 | Head | Storekeeper | Illinois |
| 20 | Clara H. Stoelting | 44 | Wife | — | Iowa |
| 21 | Mary B. Stoelting | 24 | Daughter | — | Iowa |
| 22 | Dan Stoelting | 18 | Son | — | Iowa |
| 23 | Grace Hansen | 24 | Maid | Servant | Iowa |
| 24 | Henry R. Hamann | 70 | Head | — | Iowa |
| 25 | Annie Hamann | 61 | Wife | — | Iowa |
| 26 | Lucinda Hamann | 39 | Daughter | — | Iowa |
| 27 | Blanche Hamann | 31 | Daughter | — | Iowa |
| 28 | Beonda Hamann | 26 | Daughter | — | Iowa |
| 29 | Howard Muks | 31 | Head | Bookkeeper | Iowa |
| 30 | Margaret Muks | 30 | Wife | — | Iowa |
| 31 | Wilma Datim | 55 | Mother-in-law | Dressmaker | Iowa |
| 32 | Jeanette Datim | 24 | Sister-in-law | Grade School Teacher | Iowa |
| 33 | Rupert Oyster | 55 | Head | Tool Salesman | Massachusetts |
| 34 | Lucile Oyster | 55 | Wife | — | Iowa |
| 35 | Charles A. Oyster | 21 | Son | — | Iowa |
| 36 | Sophia Krumbholz | 61 | Servant | Servant | Germany |
| 37 | Edward F. Spillain | 60 | Head | Ex. Health & Accident | Iowa |
| 38 | Carrie M. Spillain | 54 | Wife | — | Denmark |
| 39 | Mary Anna Spillain | 15 | Daughter | — | Minnesota |
| 40 | Lena Hine | 71 | Lodger | — | Iowa |
Pedigree Summary
William + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)