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William Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this William Clark across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents Wayne & Warren — first a son (b.~1918), then head of a 5-person household.
Age 22
b. ~1918
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Clark |
| Given Name | William A |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | farm hand |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 250 |
| Highest Grade | Hs 4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farm Hand |
| Township / Ward | Bloomfield Township |
| Est. Birth Year | ~1918 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Betty Clark | Daughter | — | 19 | ~1921 |
| Warren Clark | Head | — | 56 | ~1884 |
| Robert Clark | Son | — | 15 | ~1925 |
| William Clark | Son | — | 22 | ~1918 |
| Borea Clark | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Polk, Iowa
Son, age 1
Polk, Iowa · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 12
Polk, Iowa · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | William A |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 22
Polk-County, Iowa · implied b. ~1918 — 5 household members
| Surname | Clark |
| Given Name | William A |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines |
| 1935 Residence (County) | Polk |
| Occupation | farm hand |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 250 |
| Highest Grade | Hs 4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Wayne Clark (~0.92 confidence) and father Warren Clark (~0.92 confidence) and father Warren Clark (~0.92 confidence) and mother Bessie Clark (~0.92 confidence) and mother Borea Clark (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Wayne Clark
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Warren Clark
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Warren Clark
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Bessie Clark
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Borea Clark
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Clark
Son · 1940 · age 22 · b. ~1918 · Iowa
★ You are viewing this record
Sibling
Robert Clark
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Clark
Sibling · 1940 · age 19
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01192-00276)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rozella Hutchison | 13 | daughter | — | Missouri |
| 42 | Ronald D May | 23 | Head | Farm Hand | Iowa |
| 43 | Verna L May | 22 | wife | Housewife | Iowa |
| 44 | Warren E Clark | 56 | Head | Farmer | Iowa |
| 45 | Borea E Clark | 49 | wife | Housewife | Iowa |
| 46 | William A Clark THIS PERSON | 22 | son | Farm Hand | Iowa |
| 47 | Betty B Clark | 19 | daughter | — | Iowa |
| 48 | Robert W Clark | 15 | son | — | Iowa |
| 49 | Leonard W Clark | 34 | Head | Farmer | Iowa |
| 50 | Dora V Clark | 26 | wife | Housewife | Iowa |
| 51 | E. Lynne Clark | 5 | daughter | — | Iowa |
| 52 | Wayne H Clark | 3 | son | — | Iowa |
| 53 | Hallett A Clark | 64 | Head | Farmer | Iowa |
| 54 | Sarah J Clark | 65 | wife | Housewife | Iowa |
| 55 | Mabel E Clark | 32 | daughter | Teacher | Iowa |
| 56 | Charles H Barkley | 67 | Head | Farmer | Iowa |
| 57 | Effie J Barkley | 65 | wife | Housewife | Iowa |
| 58 | Alden D Gifford | 65 | Head | Farm Hand | Iowa |
| 59 | Mae E Gifford | 64 | wife | Housewife | Iowa |
| 60 | Nelson Tilton | 22 | Head | Carpenter | Iowa |
| 61 | Maxine S Tilton | 20 | wife | House Keeper | Iowa |
| 62 | Lewis W Cox | 23 | Head | Farmer | Iowa |
| 63 | Lydia W Cox | 69 | Mother | Housewife | Iowa |
| 64 | Henry Dobberstein | 35 | Head | City Clerk | Iowa |
| 65 | Nellie Dobberstein | 36 | wife | Housewife | Iowa |
| 66 | Helen Herring | 70 | Head | House Wife | Iowa |
| 67 | Mary F Herring | 32 | daughter | Housekeeper | Iowa |
| 68 | W. Carter Layfelt | 34 | Head | — | Iowa |
| 69 | Walter Strub | 55 | Head | Laborer | Switzerland |
| 70 | Anna Strub | 51 | wife | Housewife | Switzerland |
| 71 | Margaret Hess | 78 | Mother | — | Hungary |
| 72 | Louis Pizzi | 53 | Head | Millwright | Hungary |
| 73 | Helen Pizzi | 46 | wife | — | Hungary |
| 74 | Steve J Pizzi | 22 | son | Laborer | Michigan |
| 75 | Louis Jr Pizzi | 20 | son | Laborer | Iowa |
| 76 | Jimmie Pizzi | 19 | son | — | Iowa |
| 77 | Helen Pizzi | 16 | daughter | — | Iowa |
| 78 | Irene Pizzi | 12 | daughter | — | Iowa |
| 79 | Tommy Pizzi | 10 | son | — | Iowa |
| 80 | Mary Ann Pizzi | 8 | daughter | — | Iowa |
Pedigree Summary
William + 2 siblings
Gen 1 · 5 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)