MM
Mary Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this Mary Mason across the 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 10-person household.
Age 15
b. ~1925
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Mason |
| Given Name | Mary Grace |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | Same house |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Cincinnati |
| Est. Birth Year | ~1925 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Shirley Mason | Daughter | — | 12 | ~1928 |
| Marcella Mason | Daughter | — | 23 | ~1917 |
| Janeche Mason | Daughter | — | 9 | ~1931 |
| Mary Mason | Daughter | — | 15 | ~1925 |
| Thomas Mason | Head | — | 54 | ~1886 |
| Eugene Mason | Son | — | 17 | ~1923 |
| Charles Mason | Son | — | 27 | ~1913 |
| John Mason | Son | — | 19 | ~1921 |
| Raymond Mason | Son | — | 21 | ~1919 |
| Grace Mason | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Hamilton, Ohio
Daughter, age 5
Hamilton, Ohio · implied b. ~1925 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Mary Grace |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Ohio |
| Can Read/Write | none |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Daughter, age 15
Hamilton-County, Ohio · implied b. ~1925 — 10 household members
| Surname | Mason |
| Given Name | Mary Grace |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Highest Grade | Hs 1 |
| 1935 Residence | Same house |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 Mason across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mason
Daughter · 1940 · age 15 · b. ~1925 · Ohio
★ You are viewing this record
Sibling
Janeche Mason
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mason
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Mason
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Shirley Mason
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Mason
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marcella Mason
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Mason
Sibling · 1940 · age 21
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-t0627-03200-00533)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Jr. Robinson | 8 | Son | — | Ohio |
| 2 | Carl Leonhardt | 34 | Head | Machinist | Germany |
| 3 | Mary Leonhardt | 33 | Wife | — | Ohio |
| 4 | Kenneth Leonhardt | 3 | Son | — | Ohio |
| 5 | Carrie Bugriek | 64 | Head | — | Ohio |
| 6 | William Hume | 44 | Head | Glass Worker | Ohio |
| 7 | Hattie Hume | 48 | Wife | Cafeteria Help | Ohio |
| 8 | Wilma Hume | 13 | Daughter | — | Ohio |
| 9 | Betty Hume | 9 | Daughter | — | Ohio |
| 10 | Mary Radel | 19 | Daughter | — | Ohio |
| 11 | Everett Mcnealy | 51 | Head | Glass Worker | Ohio |
| 12 | Mamie Mcnealy | 51 | Wife | — | Ohio |
| 13 | Melvin Mcnealy | 23 | Son | New Worker | Ohio |
| 14 | Ruth Mcnealy | 19 | Daughter | Box Maker | Ohio |
| 15 | Thomas Mason | 54 | Head | — | Ohio |
| 16 | Grace Mason | 48 | Wife | Assembler | Ohio |
| 17 | Charles Mason | 27 | Son | Order Clerk | Ohio |
| 18 | Marcella Mason | 23 | Daughter | Factory Work | Ohio |
| 19 | Raymond Mason | 21 | Son | Spinner | Ohio |
| 20 | John Mason | 19 | Son | Barker | Ohio |
| 21 | Eugene Mason | 17 | Son | — | Ohio |
| 22 | Mary Grace Mason THIS PERSON | 15 | Daughter | — | Ohio |
| 23 | Shirley Mason | 12 | Daughter | — | Ohio |
| 24 | Janeche Mason | 9 | Daughter | — | Ohio |
| 25 | Josephine Finley | 75 | Head | — | Kentucky |
| 26 | Martha Alexander | 76 | Sister | — | Kentucky |
| 27 | Robert Brown | 48 | Head | Potmaker | Tennessee |
| 28 | Mary Brown | 50 | Wife | — | Kentucky |
| 29 | Janie Engleman | 52 | Head | — | Kentucky |
| 30 | James Engleman | 28 | Son | Truck Driver | Ohio |
| 31 | — | None | — | — | — |
| 32 | Lillie Berry | 63 | Wife-Head | — | Kentucky |
| 33 | Robert Berry | 4 | Grandson | Laborer | Ohio |
| 34 | David White | 26 | Head | — | Tennessee |
| 35 | Carrie White | 24 | Wife | — | Kentucky |
| 36 | Janet White | 4 | Daughter | — | Ohio |
| 37 | Norma Jean White | 3 | Daughter | — | Ohio |
| 38 | Carolain White | 1 | Daughter | — | Ohio |
| 39 | William Baughman | 29 | Head | Laborer | Kentucky |
| 40 | Marie Baughman | 29 | Wife | — | Kentucky |
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)