DC
Donald Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Donald Clark across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Basil & Leo — first a head (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Head
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Machinist |
| Industry | Airplane Motor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Machinist |
| Township / Ward | Indianapolis |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Donald | Age | Birth yr |
|---|---|---|---|---|
| Donald Clark | Head | — | 22 | ~1918 |
| Nancy Clark | Daughter | — | 1 | ~1939 |
| Josephine Clark | Spouse | — | 23 | ~1917 |
| Don Clark | Son | — | 2 | ~1938 |
Census Appearances
1920
Marion, Indiana
Son, age 1
Marion, Indiana · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 12
Marion, Indiana · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Head, age 22
Marion-County, Indiana · implied b. ~1918 — 4 household members
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Machinist |
| Industry | Airplane Motor |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| 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 Donald Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Basil Clark (~0.92 confidence) and father Leo Higgins (~0.92 confidence) and mother Mary Higgins (~0.92 confidence) and mother Mary Clark (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Basil Clark
b. ~1896
Source father
● Household
· direct · ~0.92
Father
Leo Higgins
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Mary Higgins
b. ~1897
Source mother
● Household
· direct · ~0.92
Mother
Mary Clark
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Donald Clark
Head · 1940 · age 22 · b. ~1918 · Indiana
★ 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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01130-00369)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Ulmer | 55 | Head | Custodian | Indiana |
| 2 | Nora Ulmer | 53 | Wife | Maid | Indiana |
| 3 | Marcella Ulmer | 15 | Daughter | — | Indiana |
| 4 | Robert Ulmer | 8 | Son | — | Indiana |
| 5 | Thomas J. Killaspy | 53 | Head | Carpenter | Indiana |
| 6 | Edith Killaspy | 42 | Wife | — | Indiana |
| 7 | William P. Killaspy | 8 | Son | — | Indiana |
| 8 | Herman Sims | 36 | Head | Pipefitter | Indiana |
| 9 | Viola Sims | 37 | Wife | Childrens Nurse | Indiana |
| 10 | Kenneth Sims | 15 | Son | — | Indiana |
| 11 | Lois Sims | 12 | Daughter | — | Indiana |
| 12 | Robert Sims | 7 | Son | — | Indiana |
| 13 | Rollie Sims | 26 | Brother | Laborer | Indiana |
| 14 | Forest L. Adkins | 31 | Head | Butcher | Indiana |
| 15 | Lillian Adkins | 25 | Wife | — | Indiana |
| 16 | Eleanor Mae Adkins | 4 | Daughter | — | Indiana |
| 17 | Jean Ann Adkins | 3 | Daughter | — | Indiana |
| 18 | Henry Becklehimer | 30 | Head | Machinist | Indiana |
| 19 | Donna Becklehimer | 25 | Wife | — | Indiana |
| 20 | Opha Becklehimer | 7 | Son | — | Indiana |
| 21 | Sandra Becklehimer | 5 | Daughter | — | Indiana |
| 24 | Ralph Spratt | 34 | Head | Salesman | Indiana |
| 25 | Mildred Spratt | 23 | Wife | Key Punch | Indiana |
| 26 | Donald Clark THIS PERSON | 22 | Head | Machinist | Indiana |
| 27 | Josephine Clark | 23 | Wife | — | Indiana |
| 28 | Don Jr. Clark | 2 | Son | — | Indiana |
| 29 | Nancy Jo Clark | 1 | Daughter | — | Indiana |
| 30 | Arnold Roellker | 30 | Head | Die Maker | Indiana |
| 31 | Lucille Roellker | 29 | Wife | — | Indiana |
| 32 | James Roellker | 3 | Son | — | Indiana |
| 33 | Halter West | 24 | Head | Milk Distributor | Indiana |
| 34 | Lois West | 25 | Wife | — | Alabama |
| 35 | James West | 2 | Son | — | Indiana |
| 36 | Virginia West | 1 | Daughter | — | Alabama |
| 37 | Fred H. Cook | 42 | Head | Salesman | Indiana |
| 38 | Ruth Cook | 31 | Wife | — | Illinois |
| 39 | Morris Stoddard | 21 | Head | Oiler | Indiana |
| 40 | Marjorie Stoddard | 21 | Wife | — | Indiana |
Pedigree Summary
Donald
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)