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Margaret Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Margaret Thomas across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1883), then head of a 3-person household.
Age 57
b. ~1883
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Table Mound Township |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Table Mound Township |
| Est. Birth Year | ~1883 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Frank Thomas | Head | — | 57 | ~1883 |
| Reynold Thomas | Son | — | 26 | ~1914 |
| Margaret Thomas | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Dubuque, Iowa
Spouse, age 37
Dubuque, Iowa · implied b. ~1883 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Spouse, age 46
Dubuque, Iowa · implied b. ~1884 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Spouse, age 57
Dubuque-County, Iowa · implied b. ~1883 — 3 household members
| Surname | Thomas |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Table Mound Township |
| 1935 Residence (County) | Dubuque |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Margaret Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Margaret Thomas
Spouse · 1940 · age 57 · b. ~1883 · 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 — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01159-00637)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Michael J. Wall | 61 | Head | — | Iowa |
| 42 | Frances Wall | 46 | Wife | — | Iowa |
| 43 | Joseph Wall | 18 | Son | Helper | Iowa |
| 44 | Alphonse Helle | 30 | Son-in-law | Farmer | Iowa |
| 45 | Cecila Helle | 21 | Daughter | — | Iowa |
| 46 | Frank P. Thomas | 57 | Head | Farmer | Iowa |
| 47 | Margaret Thomas THIS PERSON | 57 | Wife | — | Iowa |
| 48 | Reynold Thomas | 26 | Son | Farmer | Iowa |
| 49 | Joseph P. O'Connor | 76 | Head | Farmer | Iowa |
| 50 | Victoria O'Connor | 58 | Wife | — | Iowa |
| 51 | Hannah O'Connor | 24 | Daughter | Teacher | Iowa |
| 52 | Margaret A. O'Connor | 22 | Daughter | Beauty Operator | Iowa |
| 53 | Joseph J. O'Connor | 21 | Son | Helper | Iowa |
| 54 | Mary Ann O'Connor | 21 | Daughter | — | Iowa |
| 55 | Elmer P. Gordon | 42 | Head | Farmer | Iowa |
| 56 | Kathern Gordon | 44 | Wife | — | Iowa |
| 57 | John Breitbach | 38 | Hired hand | Farm Laborer | Iowa |
| 58 | George P. Behr | 60 | Head | Farmer | Iowa |
| 59 | Annie Behr | 57 | Wife | — | Iowa |
| 60 | Evelyn Behr | 30 | Daughter | Helper | Iowa |
| 61 | Francis Mahoney | 25 | Hired hand | Farm Laborer | Iowa |
| 62 | Francis D. Nolan | 61 | Head | Farmer | Iowa |
| 63 | Nell Nolan | 54 | Wife | — | Iowa |
| 64 | Helen Nolan | 28 | Daughter | Teacher | Iowa |
| 65 | Thomas Nolan | 25 | Son | Farm Laborer | Iowa |
| 66 | Arthur Nolan | 14 | Son | — | Iowa |
| 67 | Maxine Nolan | 12 | Daughter | — | Iowa |
| 68 | Edward J. Winders | 64 | Head | Farmer | Iowa |
| 69 | Mary E. Winders | 64 | Wife | — | Iowa |
| 70 | Walter P. Roerner | 37 | Head | Farmer | Iowa |
| 71 | Gladys Roerner | 34 | Wife | — | Iowa |
| 72 | Robert A. Roerner | 14 | Son | — | Iowa |
| 73 | Betty Roerner | 12 | Daughter | — | Iowa |
| 74 | Mary Roerner | 10 | Daughter | — | Iowa |
| 75 | Sally Roerner | 7 | Daughter | — | Iowa |
| 76 | John Roerner | 4 | Son | — | Iowa |
| 77 | Joseph Roerner | 3 | Son | — | Iowa |
| 78 | James Roerner | 2 | Son | — | Iowa |
| 79 | Herman Vonderhuly | 58 | Hired hand | Helper | Germany |
| 80 | Elizabeth Vonderhuly | 65 | Mother-in-law | — | Iowa |
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)