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Mary Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Adair-County, Iowa
Our Model Tree links this Mary Thomas across the 1910, 1920, 1930 and 1940 US Censuses in Adair-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1888), then head of a 3-person household.
Age 52
b. ~1888
Female
Spouse
Born: Switzerland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Adair-County, Iowa |
| Surname | Thomas |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Switzerland |
| 1935 Residence (City) | Adair Town |
| 1935 Residence (County) | Adair |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
| Township / Ward | Adair Town |
| Est. Birth Year | ~1888 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Brook Thomas | Head | — | 71 | ~1869 |
| Howard Thomas | Son | — | 22 | ~1918 |
| Mary Thomas | Spouse | — | 52 | ~1888 |
Census Appearances
1910
Adair, Iowa
Spouse, age 23
Adair, Iowa · implied b. ~1887 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Mary L |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Switzerland |
| Years Married | 0 |
| Year of Immigration | 1882 |
| Father's Birthplace | Switzerland |
| Mother's Birthplace | Switzerland |
| Occupation | none |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
1920
Adair, Iowa
Spouse, age 33
Adair, Iowa · implied b. ~1887 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Switzerland |
| Father's Birthplace | Switzerland |
| Mother's Birthplace | Switzerland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | French |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
1930
Adair, Iowa
Other, age 42
Adair, Iowa · implied b. ~1888 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Switzerland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1888 |
| Age at First Marriage | 22 |
| Father's Birthplace | Switzerland |
| Mother's Birthplace | Switzerland |
| Occupation | Carrier |
| Industry | Paper route |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
1940
Adair-County, Iowa
Spouse, age 52
Adair-County, Iowa · implied b. ~1888 — 3 household members
| Surname | Thomas |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Switzerland |
| 1935 Residence (City) | Adair Town |
| 1935 Residence (County) | Adair |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Switzerland |
| Birthplace (normalized) | switzerland |
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 Mary Thomas across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Thomas
Spouse · 1940 · age 52 · b. ~1888 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Adair-County, Iowa
Open full size
1940 US Federal Census — Adair-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01136-00030)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William B. Fugate | 75 | Lodger | — | Illinois |
| 42 | Raymond S. Hawthorne | 46 | Head | Laborer | Iowa |
| 43 | Agnes D. Hawthorne | 44 | Wife | Proprietor | Missouri |
| 44 | Marcia Hawthorne | 16 | Daughter | — | Nebraska |
| 45 | Robert Hawthorne | 9 | Son | — | Iowa |
| 46 | Bruce Schuenneman | 18 | Head | Proprietor | Iowa |
| 47 | Ida D. Murphy | 22 | Lodger | Saleswoman | Iowa |
| 48 | Laura G. Hosier | 56 | Head | — | Iowa |
| 49 | Robert Hosier | 20 | Son | Plumber And Laborer | Iowa |
| 50 | Jack Hosier | 19 | Son | Laborer | Iowa |
| 51 | Margaret Hosier | 17 | Daughter | — | Iowa |
| 52 | Verna Hosier | 16 | Daughter | — | Iowa |
| 53 | Harry Hosier | 14 | Son | — | Iowa |
| 54 | William D. Brack | 38 | Head | Carpenter | Iowa |
| 55 | Fred H. Wedemeyer | 78 | Head | — | Germany |
| 56 | George Mueller | 57 | Head | Laborer | Iowa |
| 57 | Lena D. Mueller | 53 | Wife | — | Iowa |
| 58 | Doris Mueller | 18 | Daughter | Teacher | Iowa |
| 59 | Ella D. Murphy | 71 | Head | — | Iowa |
| 60 | Joseph R. Everhard | 75 | Head | — | Indiana |
| 61 | Theresa D. Everhard | 65 | Wife | — | Pennsylvania |
| 62 | Frank D. Warrick | 52 | Head | — | Iowa |
| 63 | Henry Warrick | 22 | Son | — | Iowa |
| 64 | Irwin E. Perry | 24 | Head | Trucker | Iowa |
| 65 | Mary D. Perry | 24 | Wife | — | Iowa |
| 66 | Robert Perry | 2 | Son | — | Iowa |
| 67 | Patricia Ann Perry | 0 | Daughter | — | Iowa |
| 68 | Clarence W. Prohaska | 43 | Head | Laborer | Iowa |
| 69 | Katherine Prohaska | 43 | Wife | — | Iowa |
| 70 | John Carney | 75 | Head | — | Illinois |
| 71 | Alice C. D. Carney | 64 | Wife | — | Illinois |
| 72 | Brook R. Thomas | 71 | Head | — | Ohio |
| 73 | Mary D. Thomas THIS PERSON | 52 | Wife | — | Switzerland |
| 74 | Howard Thomas | 22 | Son | Signal Man | Iowa |
| 75 | James D. Stout | 84 | Head | — | Illinois |
| 76 | Evelyn Damman | 30 | Servant | — | Iowa |
| 77 | Arthur Scheeler | 29 | Head | Laborer | Iowa |
| 78 | Velda D. Scheeler | 24 | Wife | — | Nebraska |
| 79 | Patricia Scheeler | 7 | Daughter | — | Iowa |
| 80 | John H. Porter | 56 | Lodger | Farm Laborer | Missouri |
Related Census Records
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)