HT
Harold Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Deer-Lodge-County, Montana
Our Model Tree links this Harold Thomas across the 1920, 1930 and 1940 US Censuses in Deer-Lodge-County, Montana (XGBoost, ~Confirmed), with identified parents James & Mary — first a son (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Deer-Lodge-County, Montana |
| Surname | Thomas |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | School District No 10 Outside Anaconda City |
| 1935 Residence (County) | Deer Lodge |
| Additional Details | |
| Occupation | Mill Laborer |
| Industry | Copper Smelter |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1417 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Mill Laborer |
| Township / Ward | School District No 10 Outside Anaconda City |
| Est. Birth Year | ~1906 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Thomas | Son | — | 34 | ~1906 |
| Mabel Thomas | Daughter | — | 30 | ~1910 |
| May Thomas | Head | — | 60 | ~1880 |
Census Appearances
1920
Deer Lodge, …
Son, age 14
Deer Lodge, Montana · implied b. ~1906 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Wisconsin |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Deer Lodge, …
Son, age 24
Deer Lodge, Montana · implied b. ~1906 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Wisconsin |
| Occupation | Laborer |
| Industry | Reduction Works |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Deer-Lodge-County, Montana
Son, age 34
Deer-Lodge-County, Montana · implied b. ~1906 — 3 household members
| Surname | Thomas |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | School District No 10 Outside Anaconda City |
| 1935 Residence (County) | Deer Lodge |
| Occupation | Mill Laborer |
| Industry | Copper Smelter |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1417 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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: father James Thomas (~0.92 confidence) and mother Mary Thomas (~0.92 confidence) and mother May Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Thomas
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Mary Thomas
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
May Thomas
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Thomas
Son · 1940 · age 34 · b. ~1906 · Montana
★ You are viewing this record
Sibling
Mabel Thomas
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Deer-Lodge-County, Montana
Open full size
1940 US Federal Census — Deer-Lodge-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02217-00796)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Stella Ehlmann | 35 | Daughter | — | Montana |
| 2 | Ronald Marshall | 5 | Grandson | — | Montana |
| 3 | Leonard W. Olson | 29 | Head | Reverberatory Laborer | Minnesota |
| 4 | Hilma M. Olson | 29 | Wife | — | Montana |
| 5 | Donald L. Olson | 10 | Son | — | Montana |
| 6 | Kenneth W. Olson | 7 | Son | — | Montana |
| 7 | John Rosenleaf | 68 | Head | Craneman | Finland |
| 8 | Jennie Rosenleaf | 60 | Wife | — | Sweden |
| 9 | Dorothy Ostlund | 12 | Lodger | — | Idaho |
| 10 | Rollie E. Hoenstine | 54 | Head | Plasterer | Nebraska |
| 11 | Leona L. Hoenstine | 43 | Wife | — | Idaho |
| 12 | Mary R. Hoenstine | 17 | Daughter | — | Idaho |
| 13 | Gene L. Hoenstine | 4 | Son | — | Montana |
| 14 | Joyce Hoenstine | 1 | Daughter | — | Montana |
| 15 | Henry Schanzenbach | 33 | Head | Carpenter | So. Dakota |
| 16 | Dorothy Schanzenbach | 28 | Wife | — | So. Dakota |
| 17 | Connie Al Schanzenbach | 5 | Daughter | — | So. Dakota |
| 18 | Mahlon Schanzenbach | 5 | Son | — | So. Dakota |
| 19 | Dorothy Schanzenbach | 1 | Daughter | — | Montana |
| 20 | May Thomas | 60 | Head | — | Wisconsin |
| 21 | Harold A. Thomas THIS PERSON | 34 | Son | Mill Laborer | Montana |
| 22 | Mabel Thomas | 30 | Daughter | Registered Nurse | Idaho |
| 23 | John N. Allen | 58 | Head | Car Dumper In Flue | Tennessee |
| 24 | Daisy L. Allen | 56 | Wife | — | Tennessee |
| 25 | John F. Spangler | 58 | Head | Carpenter | Illinois |
| 26 | Delia Spangler | 48 | Wife | — | Montana |
| 27 | Aubrey V. Jackson | 26 | Head | Warehouse Laborer | Oklahoma |
| 28 | Gail M. Jackson | 24 | Wife | — | Washington |
| 29 | Garry E. Jackson | 6 | Son | — | Montana |
| 30 | Grant V. Jackson | 2 | Son | — | Montana |
| 31 | Lester H. Parks | 45 | Head | Roaster Fireman | Missouri |
| 32 | Florence Parks | 33 | Wife | — | Utah |
| 33 | Lois M. Parks | 3 | Daughter | — | Montana |
| 34 | Norman L. Broadbent | 16 | Step-son | — | Utah |
| 35 | Robert T. Broadbent | 14 | Step-son | — | Utah |
| 36 | Hanna Dragaye | 71 | Head | — | Austria |
| 37 | Mary Dragaye | 38 | Daughter | Stenographer | Montana |
| 38 | William T. Dez | 59 | Head | Change House Janitor | Michigan |
| 39 | Grace O. Dez | 53 | Wife | — | Pennsylvania |
| 40 | James C. Dez | 24 | Son | Leader | Montana |
Pedigree Summary
Harold + 1 sibling
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)