MC
Mary Caldwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this Mary Caldwell across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed) — first a spouse (b.~1877), then head of a 4-person household.
Age 63
b. ~1877
Female
Spouse
Born: Alabama
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Alabama |
| 1935 Residence (City) | Blue Ash |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Ohio |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
| Township / Ward | Cincinnati |
| Est. Birth Year | ~1877 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kate Caldwell | Daughter | — | 40 | ~1900 |
| Marguerite Caldwell | Daughter | — | 35 | ~1905 |
| Samuel Caldwell | Head | — | 70 | ~1870 |
| Mary Caldwell | Spouse | — | 63 | ~1877 |
Census Appearances
1920
Hamilton, Ohio
Spouse, age 42
Hamilton, Ohio · implied b. ~1878 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | Mary M |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Alabama |
| Father's Birthplace | Alabama |
| Mother's Birthplace | Alabama |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
1930
Hamilton, Ohio
Other, age 52
Hamilton, Ohio · implied b. ~1878 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | Mary M |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Alabama |
| Age at First Marriage | 21 |
| Father's Birthplace | Alabama |
| Mother's Birthplace | Alabama |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
1940
Hamilton-County, Ohio
Spouse, age 63
Hamilton-County, Ohio · implied b. ~1877 — 4 household members
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Alabama |
| 1935 Residence (City) | Blue Ash |
| 1935 Residence (County) | Hamilton |
| Highest Grade | Hs 4 |
| 1935 Residence | Ohio |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
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 63 · b. ~1877 · Ohio
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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 — Hamilton-County, Ohio
Open full size
1940 US Federal Census — Hamilton-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03191-00383)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Gater | 64 | Roomer | Minister | New York |
| 42 | Ruby Reed | 34 | Roomer | Waitress | Tenn. |
| 43 | Kate Bailey | 75 | Roomer | — | Ohio |
| 44 | Emil Freund | 52 | Head | Teacher | Mass. |
| 45 | Camilla Paris | 52 | Head | Teacher | Canada |
| 46 | Paul Jane | 36 | Head | Social Worker | Ohio |
| 47 | Alma Rhead | 59 | Head | Reporter | Missouri |
| 48 | Cecil Parsons | 59 | Head | Teacher | Ohio |
| 49 | Elva Hunting | 27 | Roomer | Teacher | Ohio |
| 50 | J. Helen Lumley | 54 | Head | Secretary | Louisiana |
| 51 | Gertrude Grobel | 32 | Head | Lecturer | Ohio |
| 52 | M. Stella Tyrrell | 59 | Head | Practical Nurse | Ohio |
| 53 | Evelyn Ferran | 40 | Head | Teacher | Kentucky |
| 54 | T. John Williams | 59 | Head | Minister | England |
| 55 | Donna Darkness | 45 | Head | Secretary | Ohio |
| 56 | E. Mary Williams | 69 | Head | Saleslady | Ohio |
| 57 | Alice Bushnell | 64 | Head | Seamstress | England |
| 58 | Mae Maguire | 73 | Head | — | Ohio |
| 59 | Opelice Lamb | 60 | Head | Waitress | Kentucky |
| 60 | Helena Henschel | 46 | Head | Teacher | New York |
| 61 | — | None | — | — | — |
| 62 | E. Willard Rianhard | 62 | Head | Junior Account Clerk | Ohio |
| 63 | Gertie Rianhard | 60 | Wife | — | Ohio |
| 64 | S. Emma Wald | 70 | Mother-in-law | — | Indiana |
| 65 | Samuel Caldwell | 70 | Head | Minister | Tenn. |
| 66 | Mary Caldwell THIS PERSON | 63 | Wife | — | Alabama |
| 67 | Kate Caldwell | 40 | Daughter | Stenographer | Alabama |
| 68 | Marguerite Caldwell | 35 | Daughter | Librarian | Illinois |
| 69 | C. John Weis | 47 | Head | Teacher | Kentucky |
| 70 | Clarabelle Weis | 36 | Wife | — | Penn. |
| 71 | Jessie Robinson | 60 | Head | Educational Supervisor | Ohio |
| 72 | Edmund Geohigan | 44 | Head | Salesman | Ohio |
| 73 | Helen Geohigan | 37 | Wife | Social Worker | Ohio |
| 74 | Elizabeth Geohigan | 10 | Daughter | — | Ohio |
| 75 | Daniel Geohigan | 8 | Son | — | Ohio |
| 76 | Stephen Geohigan | 6 | Son | — | Ohio |
| 77 | Magdalene Fieber | 73 | Head | — | Ohio |
| 78 | H. Herman Lachman | 31 | Head | Engineer | Ohio |
| 79 | Helen Lachman | 29 | Wife | Contract Bridge Teacher | Virginia |
| 80 | Conway Lachman | 1 | Son | — | Ohio |
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)