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Mary Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Mary Mcdermott across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1888), then head of a 9-person household.
Age 52
b. ~1888
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Prairie Creek Twp |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Prairie Creek Twp |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Patricia Mcdermott | Daughter | — | 8 | ~1932 |
| Margaret Mcdermott | Daughter | — | 19 | ~1921 |
| Dorothy Mcdermott | Daughter | — | 21 | ~1919 |
| Albinus Mcdermott | Head | — | 57 | ~1883 |
| Clement Mcdermott | Son | — | 12 | ~1928 |
| Charles Mcdermott | Son | — | 14 | ~1926 |
| Bernard Mcdermott | Son | — | 23 | ~1917 |
| Emmett Mcdermott | Son | — | 16 | ~1924 |
| Mary Mcdermott | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Dubuque, Iowa
Spouse, age 31
Dubuque, Iowa · implied b. ~1889 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Spouse, age 41
Dubuque, Iowa · implied b. ~1889 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary T. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 18 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Baking |
| Industry | Private family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Spouse, age 52
Dubuque-County, Iowa · implied b. ~1888 — 9 household members
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Prairie Creek Twp |
| 1935 Residence (County) | Dubuque |
| Highest Grade | H 4 |
| 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 Mary Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcdermott
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 — 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-t0627-01159-00626)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Victor Schiffer | 27 | Brother | Farm Labor | S Dakota |
| 42 | Thomas Carl | 37 | Head | Farmer | Iowa |
| 43 | Mabel Carl | 35 | Wife | — | Iowa |
| 44 | Mary Ann Carl | 0 | Daughter | — | Iowa |
| 45 | Henry Heidemann | 25 | Hired hand | Farm Labor | Iowa |
| 46 | Francis Donover | 47 | Head | Farmer | Iowa |
| 47 | Irene Donover | 44 | Wife | — | Iowa |
| 48 | Cletus Donover | 19 | Son | Farm Labor | Iowa |
| 49 | Clifford Donover | 19 | Son | Farm Labor | Iowa |
| 50 | Lou Mary Donover | 18 | Daughter | Sales Lady | Iowa |
| 51 | Joanne Donover | 15 | Daughter | — | Iowa |
| 52 | Albinus Mcdermott | 57 | Head | Farmer | Iowa |
| 53 | Mary Mcdermott THIS PERSON | 52 | Wife | — | Iowa |
| 54 | Bernard Mcdermott | 23 | Son | Farm Labor | Iowa |
| 55 | Dorothy Mcdermott | 21 | Daughter | Rural Teacher | Iowa |
| 56 | Margaret Mcdermott | 19 | Daughter | — | Iowa |
| 57 | Emmett Mcdermott | 16 | Son | Farm Labor | Iowa |
| 58 | Charles Mcdermott | 14 | Son | — | Iowa |
| 59 | Clement Mcdermott | 12 | Son | — | Iowa |
| 60 | Patricia Mcdermott | 8 | Daughter | — | Iowa |
| 61 | John Mccarthy | 51 | Head | Farmer | Iowa |
| 62 | Mary Mccarthy | 47 | Wife | — | Iowa |
| 63 | Ralph Mccarthy | 21 | Son | Farm Labor | Iowa |
| 64 | Justin Mccarthy | 18 | Son | — | Iowa |
| 65 | Mary Mccarthy | 17 | Daughter | — | Iowa |
| 66 | Margaret Mccarthy | 17 | Daughter | — | Iowa |
| 67 | Geraldine Mccarthy | 11 | Daughter | — | Iowa |
| 68 | Eleanore Mccarthy | 10 | Daughter | — | Iowa |
| 69 | James Mccarthy | 10 | Son | — | Iowa |
| 70 | Clarence Mccullough | 38 | Head | Farmer | Iowa |
| 71 | Catherine Mccullough | 32 | Wife | — | Iowa |
| 72 | Charles Mccullough | 0 | Son | — | Iowa |
| 73 | John Mitchell | 22 | Hired hand | Farm Labor | Iowa |
| 74 | Raphael Goggin | 41 | Head | Farmer | Iowa |
| 75 | Ann Goggin | 47 | Sister | — | Iowa |
| 76 | Henry Meyer | 42 | Head | Farmer | S Dakota |
| 77 | Catherine Meyer | 40 | Wife | — | Iowa |
| 78 | Marie Meyer | 13 | Daughter | — | Iowa |
| 79 | Virginia Meyer | 13 | Daughter | — | Iowa |
| 80 | Merlin Meyer | 11 | Son | — | Iowa |
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)