FT
Fred Thomas — 1930 US Census Record
Model Tree available1930 United States Federal Census · Marion, Indiana
Our Model Tree links this Fred Thomas across the 1920, 1930 and 1940 US Censuses in Marion, Indiana (XGBoost, ~Confirmed), with identified parents John & Emma — first a head (b.~1900), then head of a 4-person household.
Age 30
b. ~1900
Male
Head
Born: Indiana
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Marion, Indiana |
| Surname | Thomas |
| Given Name | Fred A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Indiana |
| Age at First Marriage | 26 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Additional Details | |
| Occupation | Physician |
| Industry | Medical |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 45 |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Physician |
| Township / Ward | Indianapolis Cit |
| Est. Birth Year | ~1900 |
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 1930 census.
| Name | Relation to head | Relative to Fred | Age | Birth yr |
|---|---|---|---|---|
| Mary Thomas | Daughter | — | 2 | ~1928 |
| Fred Thomas | Head | — | 30 | ~1900 |
| Mary Cornwell | Other | — | 26 | ~1904 |
| Marie Thomas | Spouse | — | 32 | ~1898 |
Census Appearances
1920
Marion, Indiana
Son, age 21
Marion, Indiana · implied b. ~1899 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Fred M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Machinist |
| Industry | Machine Shop |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Head, age 30
Marion, Indiana · implied b. ~1900 — 4 household members
| Surname | Thomas |
| Given Name | Fred A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Indiana |
| Age at First Marriage | 26 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Physician |
| Industry | Medical |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 45 |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Head, age 40
Marion-County, Indiana · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Frederick B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis City |
| 1935 Residence (County) | Marion |
| Occupation | Physician |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 45 |
| Income (1939) | 0 |
| Highest Grade | C-4 |
| 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 Fred Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Thomas (~0.92 confidence) and mother Emma Thomas (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Thomas
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Emma Thomas
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Fred Thomas
Head · 1930 · age 30 · b. ~1900 · Indiana
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Marion, Indiana
Open full size
1930 US Federal Census — Marion, Indiana
Page Contents
32 people indexed on this census page (ia:1930:indianacensus00reel609:0108)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ralph Carr | 26 | Head | Mechanic | Indiana |
| 2 | Helda Carr | 23 | Wife | Knitter | Indiana |
| 3 | John J Kelley | 62 | Head | Motorman | Indiana |
| 4 | Delia Kelley | 52 | Wife | — | Irish Free State |
| 5 | Edward M Kelley | 25 | Son | Salesman | Indiana |
| 6 | Mary H Kelley | 27 | Daughter | Typist | Indiana |
| 7 | Margaret F Kelley | 23 | Daughter | Typist | Indiana |
| 8 | Omer Baird | 45 | Head | Fireman | Indiana |
| 9 | Margaret Baird | 45 | Wife | — | Indiana |
| 10 | Clarence Baird | 21 | Son | Order Clerk | Indiana |
| 11 | Joseph W Morrow | 25 | Head | Engineer | Alabama |
| 12 | Mary M Morrow | 23 | Wife | — | Illinois |
| 13 | Lloyd Morrow | 2 | Son | — | Alabama |
| 14 | Patrick Loftus | 46 | Head | — | Irish Free State |
| 15 | Maria Loftus | 41 | Wife | Cook | Irish Free State |
| 16 | Delia Loftus | 17 | Daughter | Bookkeeping | Indiana |
| 17 | Joseph Loftus | 5 | Son | — | Indiana |
| 18 | Phrone Haney | 60 | Head | — | Indiana |
| 19 | Julia Haney | 19 | Daughter | Stenographer | Indiana |
| 20 | Hazel Bailey | 24 | Lodger | Trained Nurse | Indiana |
| 21 | Fred A Thomas THIS PERSON | 30 | Head | Physician | Indiana |
| 22 | Marie Thomas | 32 | Wife | — | Indiana |
| 23 | Mary F Thomas | 2 | Daughter | — | Indiana |
| 24 | Mary Cornwell | 26 | Servant | Servant | Indiana |
| 25 | Manda Richey | 64 | Head | Servant | Tennessee |
| 26 | Edward A Ryan | 47 | Head | Commercial | Indiana |
| 27 | Gertrude C Ryan | 45 | Wife | — | Indiana |
| 28 | Edwin G Ryan | 24 | Son | — | Indiana |
| 29 | Anna M Ryan | 17 | Daughter | — | Indiana |
| 30 | James T Duffey | 27 | Lodger | Lab Clerk | Indiana |
| 31 | Lawrence Dolphin | 37 | Head | Salesman | Ohio |
| 32 | Martha Barton | 24 | Lodger | Stenographer | Indiana |
Pedigree Summary
Fred
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 1930 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)