HT
Harold Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Harold Thomas across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Thelma & Gilbert — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Driller |
| Industry | Aeroplane Manufacture |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 467 |
| Highest Grade | Hs 3 |
| 1935 Residence | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Driller |
| 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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Thelma Thomas | Spouse | — | 40 | ~1900 |
| Betty Thomas | Other | — | 21 | ~1919 |
| Gilbert Thomas | Head | — | 41 | ~1899 |
| Harold Thomas | Son | — | 22 | ~1918 |
Census Appearances
1920
Marion, Indiana
Son, age 1
Marion, Indiana · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 12
Marion, Indiana · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 22
Marion-County, Indiana · implied b. ~1918 — 4 household members
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Driller |
| Industry | Aeroplane Manufacture |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 467 |
| Highest Grade | Hs 3 |
| 1935 Residence | Indiana |
| 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 Harold Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Thelma Thomas (~0.92 confidence) and father Gilbert Thomas (~0.92 confidence) and mother Thelma Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Thelma Thomas
b. ~1896
Source mother
● Household
· direct · ~0.92
Father
Gilbert Thomas
b. ~1899
Source father
● Household
· direct · ~0.92
Mother
Thelma Thomas
b. ~1900
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Thomas
Son · 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
40 people indexed on this census page (nara:1940:m-t0627-01123-00169)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Blaine Lee | 16 | Son | New Worker | Illinois |
| 2 | Marilyn Lee | 13 | Daughter | — | Indiana |
| 3 | Juanita Lee | 11 | Daughter | — | Indiana |
| 4 | George Mcnutt | 36 | Head | Truck Driver | Indiana |
| 5 | Harriet Mcnutt | 34 | Wife | — | Indiana |
| 6 | James Mcnutt | 16 | Son | — | Indiana |
| 7 | Robert Mcnutt | 13 | Son | — | Indiana |
| 8 | George J. Mason | 48 | Head | Deputy Sheriff | Greece |
| 9 | Helen Mason | 34 | Wife | — | Indiana |
| 10 | John George Mason | 9 | Son | — | Indiana |
| 11 | Gilbert D. Thomas | 41 | Head | Assistant Material Engineer | Indiana |
| 12 | Thelma Thomas | 40 | Wife | Visitor | Indiana |
| 13 | Harold Thomas THIS PERSON | 22 | Son | Driller | Indiana |
| 14 | Betty Thomas | 21 | Daughter-in-law | — | Michigan |
| 15 | Bertha R. Hardy | 59 | Head | — | Ohio |
| 16 | Bertha L. Hardy | 37 | Daughter | Clothing Manufacture | Ohio |
| 17 | Eleanor R. Hardy | 34 | Daughter | Advertising | Ohio |
| 18 | Vivian H. Hewlin | 43 | Head | U.S. Post Office | Indiana |
| 19 | William H. Hewlin | 17 | Son | — | Indiana |
| 20 | Marian Hewlin | 13 | Daughter | — | Indiana |
| 21 | Danan E. Barker | 63 | Head | Packing Supplies | Indiana |
| 22 | Lillian Barker | 55 | Wife | — | Indiana |
| 23 | Following Persons | None | live in | — | — |
| 24 | Vernon Lamb | 36 | Head | Car Inspector | Indiana |
| 25 | Ida Lamb | 35 | Wife | Saleslady | Indiana |
| 26 | La Verne Lamb | 14 | Daughter | Musician | Indiana |
| 27 | Norman Lamb | 12 | Son | — | Indiana |
| 28 | Donald Lamb | 10 | Son | — | Indiana |
| 29 | Benjamin Lyman | 71 | Head | R. Art Supplies | Czechoslovakia |
| 30 | Ottilie Lyman | 69 | Wife | — | Czechoslovakia |
| 31 | Alfred Paul | 22 | Lodger | Clerk In Sales Department | Germany |
| 32 | Wallace Mcquhae | 69 | Head | — | Connecticut |
| 33 | Lillian Mcquhae | 68 | Wife | — | Illinois |
| 34 | Maggie Smith | 60 | Housekeeper | Private Home | Indiana |
| 35 | Irene Riddell | 55 | Head | Bookkeeper | Ohio |
| 36 | Elbert Harper Latshaw | 63 | Lodger | Salesman | Indiana |
| 37 | Alice P. Hill | 69 | Head | — | Ohio |
| 38 | Jessica W. Morris | 62 | Head | — | Indiana |
| 39 | Kate Doris | 55 | Head | High School | Indiana |
| 40 | Mable Doris | 50 | Sister | High School | Indiana |
Related Census Records
Pedigree Summary
Harold
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)