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Mary Bell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Mary Bell across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 7-person household.
Age 42
b. ~1898
Female
Spouse
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Bell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Dubuque |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Township / Ward | Dubuque |
| Est. Birth Year | ~1898 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Doris Bell | Daughter | — | 17 | ~1923 |
| John Bell | Head | — | 46 | ~1894 |
| Joseph Bell | Son | — | 12 | ~1928 |
| George Bell | Son | — | 19 | ~1921 |
| Robert Bell | Son | — | 18 | ~1922 |
| Gordon Bell | Son | — | 21 | ~1919 |
| Mary Bell | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Dubuque, Iowa
Spouse, age 21
Dubuque, Iowa · implied b. ~1899 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Bell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
Dubuque, Iowa
Spouse, age 32
Dubuque, Iowa · implied b. ~1898 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Bell |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 18 |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Dubuque-County, Iowa
Spouse, age 42
Dubuque-County, Iowa · implied b. ~1898 — 7 household members
| Surname | Bell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Dubuque |
| 1935 Residence (County) | Dubuque |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 Bell 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 Bell
Spouse · 1940 · age 42 · b. ~1898 · 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-t0627-01159-00405)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Douglas Heinen | 19 | Son | Cook | Iowa |
| 42 | Howard Heinen | 15 | Son | — | Iowa |
| 43 | Doris Heinen | 12 | Daughter | — | Iowa |
| 44 | John Bell | 46 | Head | Contractor | Wisconsin |
| 45 | Mary Bell THIS PERSON | 42 | Wife | — | Wisconsin |
| 46 | Gordon Bell | 21 | Son | Laborer | Iowa |
| 47 | George Bell | 19 | Son | Laborer | Iowa |
| 48 | Robert Bell | 18 | Son | Laborer | Iowa |
| 49 | Doris Bell | 17 | Daughter | — | Iowa |
| 50 | Joseph Bell | 12 | Son | — | Iowa |
| 51 | Will Howell | 39 | Head | Curb Setter | Iowa |
| 52 | Eunice Howell | 46 | Wife | — | Iowa |
| 53 | Carl Howell | 10 | Son | — | Iowa |
| 54 | Dana Howell | 7 | Son | — | Iowa |
| 55 | Dickie Ray Howell | 6 | Son | — | Iowa |
| 56 | Ronald Howell | 4 | Son | — | Iowa |
| 57 | Arthur Potter | 22 | Step-son | Painter | Iowa |
| 58 | Earl Potter | 18 | Step-son | Laborer | Iowa |
| 59 | Loyal Swinford | 34 | Head | Manager | Illinois |
| 60 | Catherine Swinford | 31 | Wife | Assistant Manager | Kentucky |
| 61 | Billy Swinford | 9 | Son | — | Illinois |
| 62 | Robert Walton | 31 | Head | Truck Driver | Iowa |
| 63 | Alena Walton | 26 | Wife | — | Minnesota |
| 64 | George R. Walton | 8 | Son | — | Missouri |
| 65 | Richard Walton | 3 | Son | — | Iowa |
| 66 | Donald Walton | 1 | Son | — | Iowa |
| 67 | Wilson Barker | 25 | Lodger | Laborer | Iowa |
| 68 | George E. Shellady | 38 | Head | Laborer | Iowa |
| 69 | Iva Shellady | 24 | Wife | — | Mississippi |
| 70 | John Overmayer | 42 | Head | Truck Driver | Iowa |
| 71 | Lois Overmayer | 42 | Wife | — | Iowa |
| 72 | George Cornwall | 63 | Head | Night Watchman | Wisconsin |
| 73 | Louisa Cornwall | 48 | Wife | — | Iowa |
| 74 | Harry Maiden | 24 | Son-in-law | Truck Driver | Wisconsin |
| 75 | Velma Maiden | 19 | Daughter | — | Iowa |
| 76 | Darlene Maiden | 2 | Granddaughter | — | Iowa |
| 77 | Sherron Maiden | 0 | Granddaughter | — | Iowa |
| 78 | John Kennedy | 46 | Head | Bartender | Iowa |
| 79 | Marie Kennedy | 44 | Wife | — | Iowa |
| 80 | Samuel D. Seeley | 70 | Head | Stationary Engineer | 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)