MC
Mary Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this Mary Campbell across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed), with identified parents John & Catherine — first a daughter (b.~1884), then head of a 6-person household.
Age 56
b. ~1884
Female
Daughter
Born: Scotland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Retail Drug Store |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1610 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Bookkeeper |
| Township / Ward | Cincinnati |
| Est. Birth Year | ~1884 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Campbell | Daughter | — | 56 | ~1884 |
| Euphemia Campbell | Daughter | — | 57 | ~1883 |
| Catherine Leighton | Daughter | — | 44 | ~1896 |
| Catherine Campbell | Head | — | 90 | ~1850 |
| John Campbell | Other | — | 12 | ~1928 |
| Frank Leighton | Other | — | 46 | ~1894 |
Census Appearances
1920
Hamilton, Ohio
Daughter, age 36
Hamilton, Ohio · implied b. ~1884 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1882 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Bookkeeper |
| Industry | Clothing Bus. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Year of Naturalization | 1883 |
| Birthplace (normalized) | scotland |
1930
Hamilton, Ohio
Daughter, age 46
Hamilton, Ohio · implied b. ~1884 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1885 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Bookkeeper |
| Industry | Cloak Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Veteran | No |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Hamilton-County, Ohio
Daughter, age 56
Hamilton-County, Ohio · implied b. ~1884 — 6 household members
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Naturalization Status | Naturalized |
| Occupation | Bookkeeper |
| Industry | Retail Drug Store |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 1610 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Campbell (~0.92 confidence) and mother Catherine Campbell (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Campbell
b. ~1846
Source father
● Household
· direct · ~0.92
Mother
Catherine Campbell
b. ~1850
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Campbell
Daughter · 1940 · age 56 · b. ~1884 · Ohio
★ You are viewing this record
Sibling
Catherine Leighton
Sibling · 1940 · age 44
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Euphemia Campbell
Sibling · 1940 · age 57
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-03194-00020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William O. Appel | 67 | Head | Shoe Cutter | Ohio |
| 2 | Agusta Appel | 62 | Wife | — | Ohio |
| 3 | Catherine Campbell | 90 | Head | — | Scotland |
| 4 | Euphemia Campbell | 57 | Daughter | — | Scotland |
| 5 | Mary Campbell THIS PERSON | 56 | Daughter | Bookkeeper | Scotland |
| 6 | John Campbell | 12 | Grandson | — | Ohio |
| 7 | Frank Leighton | 46 | Son-in-law | Electrical Engineer | New Jersey |
| 8 | Catherine Leighton | 44 | Daughter | — | Ohio |
| 9 | Hans R. Rau | 44 | Head | Doctor | Germany |
| 10 | Mollie Rau | 41 | Wife | — | Germany |
| 11 | Ernan Rau | 11 | Daughter | — | Germany |
| 12 | John Rau | 8 | Son | — | Germany |
| 13 | Thelma Rau | 76 | Mother | — | Germany |
| 14 | Gretel Muller | 35 | Maid | Maid | Germany |
| 15 | William O. Roslow | 50 | Head | Patrolman | Ohio |
| 16 | Ruth Roslow | 35 | Wife | — | Ohio |
| 17 | Albert O. Wentworth | 69 | Head | Contractor | Ohio |
| 18 | Mable Wentworth | 60 | Wife | — | Ohio |
| 19 | Edward W. Schriever | 62 | Head | Public Accountant | Ohio |
| 20 | Mary Jane Schriever | 48 | Wife | Teacher | Ohio |
| 21 | Ellen Schriever | 19 | Daughter | — | Ohio |
| 22 | Clifford O. Traish | 52 | Head | Salesman | Ohio |
| 23 | Marian Traish | 46 | Wife | — | Pennsylvania |
| 24 | William Traish | 17 | Son | Clerk | Ohio |
| 25 | Frances Traish | 15 | Daughter | — | Ohio |
| 26 | Jane Traish | 13 | Daughter | — | Ohio |
| 27 | James Traish | 7 | Son | — | Ohio |
| 28 | Lester Martin | 38 | Head | Buyer | Ohio |
| 29 | Hortense Martin | 45 | Wife | Librarian | Ohio |
| 30 | Cave D. Dorch | 55 | Head | — | Indiana |
| 31 | Joseph Dorch | 51 | Brother | — | Indiana |
| 32 | Mary Dorch | 80 | Mother | — | Ohio |
| 33 | Everett H. Hobart | 39 | Head | Manufacturer | Ohio |
| 34 | Louise Hobart | 37 | Wife | — | Ohio |
| 35 | Mary Hobart | 12 | Daughter | — | Ohio |
| 36 | Everett Hobart | 8 | Son | — | Ohio |
| 37 | James Hobart | 5 | Son | — | Ohio |
| 38 | John D. Dalzell | 38 | Head | Manager | Ohio |
| 39 | Mary Louise Dalzell | 38 | Wife | — | Ohio |
| 40 | John Dalzell | 8 | Son | — | Ohio |
Related Census Records
Pedigree Summary
Mary + 2 siblings
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)