HC
Harry Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mills-County, Iowa
Our Model Tree links this Harry Clark across the 1920, 1930 and 1940 US Censuses in Mills-County, Iowa (XGBoost, ~Confirmed), with identified parents Will & Maggie — first a head (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mills-County, Iowa |
| Surname | Clark |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Mills |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | Iowa |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Indian Creek Township |
| Est. Birth Year | ~1910 |
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 Harry | Age | Birth yr |
|---|---|---|---|---|
| Irena Clark | Daughter | — | 3 | ~1937 |
| Harry Clark | Head | — | 30 | ~1910 |
| Herren Clark | Other | — | 19 | ~1921 |
| Thelma Clark | Spouse | — | 22 | ~1918 |
Census Appearances
1920
Mills, Iowa
Son, age 9
Mills, Iowa · implied b. ~1911 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Mills, Iowa
Other, age 20
Mills, Iowa · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harry |
| Relationship to Head | Brother |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Mills-County, Iowa
Head, age 30
Mills-County, Iowa · implied b. ~1910 — 4 household members
| Surname | Clark |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Mills |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | Iowa |
| 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 Harry Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Will Clark (~0.92 confidence) and mother Maggie Clark (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Will Clark
b. ~1862
Source father
● Household
· direct · ~0.92
Mother
Maggie Clark
b. ~1870
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Clark
Head · 1940 · age 30 · b. ~1910 · Iowa
★ 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 — Mills-County, Iowa
Open full size
1940 US Federal Census — Mills-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01183-00244)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Francis Gilleland | 2 | Son | — | — |
| 2 | Billy Gilleland | 0 | Son | — | — |
| 3 | Charles Carson | 63 | Head | Farmer | Iowa |
| 4 | Amber Carson | 56 | Wife | — | Iowa |
| 5 | La Verne Carson | 22 | Son | Farm Laborer | Iowa |
| 6 | Harry Clark THIS PERSON | 30 | Head | Farmer | Illinois |
| 7 | Thelma Clark | 22 | Wife | — | Kentucky |
| 8 | Irena Clark | 3 | Daughter | — | — |
| 9 | Herren, Alva Clark | 19 | Hired Hand | Farm Laborer | Missouri |
| 10 | Guy Osborn | 34 | Head | Farm Laborer | Missouri |
| 11 | Cora Osborn | 36 | Wife | — | Missouri |
| 12 | Dale Osborn | 13 | Son | — | Iowa |
| 13 | Darlene Osborn | 5 | Daughter | — | — |
| 14 | Eulie Lewis | 20 | Hired Hand | Farm Laborer | Missouri |
| 15 | Claude D. Barns | 49 | Head | Farmer | Iowa |
| 16 | Esma Barns | 50 | Wife | — | Iowa |
| 17 | John Barns | 15 | Son | — | Iowa |
| 18 | Paul Carlstedt | 36 | Head | Farmer | Iowa |
| 19 | Mary Carlstedt | 33 | Wife | — | Iowa |
| 20 | Paul L. Carlstedt | 10 | Son | — | Iowa |
| 21 | Duane Carlstedt | 3 | Son | — | — |
| 22 | Hulda Carlstedt | 76 | Mother | — | Sweden |
| 23 | Forrest Achenbaugh | 41 | Head | Farmer | Iowa |
| 24 | Sylvia Achenbaugh | 42 | Wife | — | Iowa |
| 25 | Darrell Achenbaugh | 21 | Son | Farmer | Iowa |
| 26 | Darlene Achenbaugh | 19 | Daughter | Maid | Iowa |
| 27 | Ray B. Tubbs | 60 | Head | Farmer | Iowa |
| 28 | Pearle J. Tubbs | 60 | Wife | — | Iowa |
| 29 | George A. Stille | 28 | Head | Farm Laborer | Iowa |
| 30 | Helen Stille | 29 | Wife | — | Iowa |
| 31 | Carolyn Stille | 4 | Daughter | — | — |
| 32 | Joyce Stille | 1 | Daughter | — | — |
| 33 | Atko Bryan | 20 | Hired Hand | Farm Laborer | Iowa |
| 34 | Julius Bilek | 26 | Head | Farmer | Iowa |
| 35 | Frances Bilek | 24 | Wife | — | Iowa |
| 36 | Janet Bilek | 1 | Daughter | — | — |
| 37 | Carl Buch | 28 | Head | Farmer | Iowa |
| 38 | Dorothy Buch | 24 | Wife | — | Iowa |
| 39 | Eleanor Buch | 1 | Daughter | — | — |
| 40 | Clarence A. Barns | 58 | Head | Farmer | Iowa |
Pedigree Summary
Harry
Gen 1 · 2 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)