MC
Mary Caldwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Webster-County, Iowa
Our Model Tree links this Mary Caldwell across the 1920, 1930 and 1940 US Censuses in Webster-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1864), then head of a 5-person household.
Age 76
b. ~1864
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Webster-County, Iowa |
| Surname | Caldwell |
| Given Name | Mary B. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Fort Dodge |
| 1935 Residence (County) | Webster |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Fort Dodge |
| Est. Birth Year | ~1864 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| W Caldwell | Head | — | 79 | ~1861 |
| Julia Stevenson | Other | — | 28 | ~1912 |
| Daisy Gilchrist | Other | — | 58 | ~1882 |
| Thomas Gilchrist | Son | — | 23 | ~1917 |
| Mary Caldwell | Spouse | — | 76 | ~1864 |
Census Appearances
1920
Webster, Iowa
Spouse, age 56
Webster, Iowa · implied b. ~1864 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Webster, Iowa
Spouse, age 66
Webster, Iowa · implied b. ~1864 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | Mary A |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 18 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Webster-County, Iowa
Spouse, age 76
Webster-County, Iowa · implied b. ~1864 — 5 household members
| Surname | Caldwell |
| Given Name | Mary B. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 76 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Fort Dodge |
| 1935 Residence (County) | Webster |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Caldwell 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 Caldwell
Spouse · 1940 · age 76 · b. ~1864 · 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 — Webster-County, Iowa
Open full size
1940 US Federal Census — Webster-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01212-00907)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | W. Q. Caldwell | 79 | Head | Salesman | Illinois |
| 42 | Mary B. Caldwell THIS PERSON | 76 | Wife | — | Illinois |
| 43 | Daisy R. Gilchrist | 58 | Sister | — | Iowa |
| 44 | Thomas R. Gilchrist | 23 | Son | Labor | Iowa |
| 45 | Julia Stevenson | 28 | Lodger | Salesman | Iowa |
| 46 | Warren Fred Van Dyck | 36 | Head | Mgr. | Iowa |
| 47 | Florence Van Dyck | 36 | Wife | Saleslady | Iowa |
| 48 | James E. Hinton | 30 | Head | Salesman | Kentucky |
| 49 | Marion J. Hinton | 34 | Wife | — | Iowa |
| 50 | Betty Jane Clausen | 17 | Daughter | — | Iowa |
| 51 | Marilyn C. Clausen | 15 | Daughter | — | Iowa |
| 52 | James Jr. Hinton | 10 | Son | — | Iowa |
| 53 | Nancy Anne Hinton | 3 | Daughter | — | Iowa |
| 54 | E. Leslie Queen | 40 | Head | Ship. Clerk | Iowa |
| 55 | Mala R. Queen | 40 | Wife | Laundry | Minnesota |
| 56 | Wayne C. Harter | 34 | Head | Barber | Iowa |
| 57 | Lela M. Harter | 34 | Wife | — | Iowa |
| 58 | Fern M. Sanders | 14 | Daughter | — | Iowa |
| 59 | John C. D. Moore | 34 | Head | County Eng. | Iowa |
| 60 | Irene Moore | 32 | Wife | — | Iowa |
| 61 | John Moore | 10 | Son | — | Indiana |
| 62 | Gordon Moore | 7 | Son | — | Iowa |
| 63 | Emerson Gorman | 24 | Head | Bus Driver | Iowa |
| 64 | Anna Gorman | 23 | Wife | — | Iowa |
| 65 | Robert Gorman | 3 | Son | — | Iowa |
| 66 | Thomas Gorman | 2 | Son | — | Iowa |
| 67 | Jimmie Gorman | 0 | Son | — | Iowa |
| 68 | Frank Furman | 58 | Head | Painter | Iowa |
| 69 | Emma Furman | 56 | Wife | Kitchen Help | Iowa |
| 70 | Frank J. Hartnett | 53 | Head | Farmer | Iowa |
| 71 | Aleen Hartnett | 25 | Daughter | Mach. Opr. | Iowa |
| 72 | Francis Echelberger | 21 | Head | Labor | Iowa |
| 73 | Gladys Echelberger | 19 | Wife | — | Iowa |
| 74 | Michael Echelberger | 1 | Son | — | Iowa |
| 75 | Ray Follettes | 28 | Head | Cr. Collector | Iowa |
| 76 | Ruth Follettes | 24 | Wife | — | Iowa |
| 77 | Ray Jean Follettes | 5 | Daughter | — | Iowa |
| 78 | Maude Porter | 57 | Head | — | Iowa |
| 79 | Richard J. Porter | 30 | Son | Switchman | Iowa |
| 80 | Jane Porter | 13 | Daughter | — | 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)