HC
Harry Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hamilton-County, Illinois
Our Model Tree links this Harry Clark across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Illinois (XGBoost, ~Confirmed), with identified parents J & Irvin — first a head (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Illinois |
| Surname | Clark |
| Given Name | Harry O. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Crouch Township |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 53 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Crouch Township |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Betty Clark | Daughter | — | 6 | ~1934 |
| Harry Clark | Head | — | 27 | ~1913 |
| Dwight Clark | Son | — | 5 | ~1935 |
| Eunice Clark | Spouse | — | 27 | ~1913 |
Census Appearances
1920
Hamilton, Illinois
Son, age 7
Hamilton, Illinois · implied b. ~1913 — 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 | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Hamilton, Illinois
Son, age 17
Hamilton, Illinois · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harry E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| 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
Hamilton-County, Illinois
Head, age 27
Hamilton-County, Illinois · implied b. ~1913 — 4 household members
| Surname | Clark |
| Given Name | Harry O. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Crouch Township |
| 1935 Residence (County) | Hamilton |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 53 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| 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 J Clark (~0.92 confidence) and father Irvin Clark (~0.92 confidence) and mother Elizabeth Clark (~0.92 confidence) and mother Elisabeth Clark (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
J Clark
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Irvin Clark
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Clark
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Elisabeth Clark
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Clark
Head · 1940 · age 27 · b. ~1913 · 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 — Hamilton-County, Illinois
Open full size
1940 US Federal Census — Hamilton-County, Illinois
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-00809-00587)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leonard Nelson | 12 | Son | — | Illinois |
| 42 | Marshall Nelson | 6 | Son | — | Illinois |
| 43 | Donald Nelson | 3 | Son | — | Illinois |
| 44 | David Hardy | 15 | Hired girl | Sales Clerk | Illinois |
| 45 | Earl E. Wilson | 46 | Head | Farmer | Illinois |
| 46 | Nellie Wilson | 42 | Wife | — | Illinois |
| 47 | Virginia Sheasley | 23 | Daughter | Seamstress | Illinois |
| 48 | Edward Sheasley | 22 | Son-in-law | Teacher | Illinois |
| 49 | Robert Mitchell | 6 | Grandson | — | Illinois |
| 50 | Ralph Yelland | 37 | Head | Supervisor | Illinois |
| 51 | Mildred Yelland | 33 | Wife | — | Illinois |
| 52 | Frank Hunt | 64 | Head | Laborer | Illinois |
| 53 | Effie S. Hunt | 52 | Wife | — | Illinois |
| 54 | Gussie Laster | 25 | Daughter | Housework | Illinois |
| 55 | Harry Laster | 19 | Son | Farm Laborer | Illinois |
| 56 | Millard Hunt | 15 | Son | — | Illinois |
| 57 | Elda Hunt | 11 | Daughter | — | Illinois |
| 58 | Glide Laster | 6 | Nephew | — | Illinois |
| 59 | Harry O. Clark THIS PERSON | 27 | Head | Farmer | Illinois |
| 60 | Eunice Clark | 27 | Wife | Seamstress | Illinois |
| 61 | Dwight Clark | 5 | Son | — | Illinois |
| 62 | Betty Clark | 6 | Daughter | — | Illinois |
| 63 | Lillie Gallaher | 58 | Head | — | Illinois |
| 64 | Ralph White | 29 | Head | Carpenter | N. Dakota |
| 65 | Halley White | 27 | Brother | Farmer | N. Dakota |
| 66 | Jake Waters | 70 | Head | — | Minnesota |
| 67 | Jake Waters | 46 | Son | Laborer | Indiana |
| 68 | Ben Waters | 21 | Son | Laborer | Illinois |
| 69 | H. C. Fulkersin | 44 | Head | Dentist | Illinois |
| 70 | Helene Fulkersin | 40 | Wife | — | Illinois |
| 71 | Robert Sinclair | 20 | Step-son | Farm Laborer | Illinois |
| 72 | Virginia Price | 15 | Step-daughter | — | Illinois |
| 73 | A. H. Cooper | 39 | Head | Farmer | Illinois |
| 74 | Annie Cooper | 44 | Wife | — | Illinois |
| 75 | Hylton Cooper | 16 | Son | Farm Laborer | Illinois |
| 76 | Ralph Podenny | 60 | Head | Painter | Illinois |
Pedigree Summary
Harry
Gen 1 · 4 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)