MF
Mary Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this Mary Frederick across the 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 6-person household.
Age 10
b. ~1930
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Frederick |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Sycamore Twp |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Sycamore Twp |
| Est. Birth Year | ~1930 |
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 |
|---|---|---|---|---|
| Russell Frederick | Son | — | 13 | ~1927 |
| Fannie Frederick | Spouse | — | 45 | ~1895 |
| Lila Frederick | Daughter | — | 18 | ~1922 |
| Ruth Frederick | Daughter | — | 14 | ~1926 |
| Mary Frederick | Daughter | — | 10 | ~1930 |
| Henry Frederick | Head | — | 47 | ~1893 |
Census Appearances
1930
Hamilton, Ohio
Daughter, age
Hamilton, Ohio · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Margaret M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Kentucky |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Daughter, age 10
Hamilton-County, Ohio · implied b. ~1930 — 6 household members
| Surname | Frederick |
| Given Name | Mary L |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Sycamore Twp |
| 1935 Residence (County) | Hamilton |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| 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 Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frederick
Daughter · 1940 · age 10 · b. ~1930 · Ohio
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Sibling
Ruth Frederick
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russell Frederick
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lila Frederick
Sibling · 1940 · age 18
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-t0627-03080-00742)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Forest B Floyd | 63 | Head | Lawyer | Ohio |
| 2 | George Brockmann | 25 | Head | Caretaker | Iowa |
| 3 | Martha Brockmann | 22 | Wife | — | Ohio |
| 4 | Andy Lama | 63 | Boarder | Laborer | Ohio |
| 5 | Charles Ulm | 27 | Boarder | Carpenter | Ohio |
| 6 | Henry B Frederick | 47 | Head | Conductor | Kentucky |
| 7 | Fannie Frederick | 45 | Wife | — | West Virginia |
| 8 | Lila V Frederick | 18 | Daughter | Stenographer | West Virginia |
| 9 | Russell W Frederick | 13 | Son | — | West Virginia |
| 10 | Ruth A Frederick | 14 | Daughter | — | Ohio |
| 11 | Mary L Frederick THIS PERSON | 10 | Daughter | — | Ohio |
| 12 | Luman W Almy | 46 | Head | Clergyman | Illinois |
| 13 | Ruth Almy | 39 | Wife | — | Illinois |
| 14 | Ruth Ester Almy | 14 | Daughter | — | Illinois |
| 15 | Richard Almy | 9 | Son | — | Illinois |
| 16 | Albert Shoop | 33 | Head | Metal Worker | Indiana |
| 17 | Opal Shoop | 32 | Wife | — | Indiana |
| 18 | James Shoop | 9 | Son | — | Ohio |
| 19 | Thomas S Clark | 56 | Head | Farmer | Ireland (Eire) |
| 20 | Mary Clark | 52 | Wife | — | Ireland (Eire) |
| 21 | Charles Dargue | 60 | Hired man | Farm Helper | Ohio |
| 22 | Emmet Ferris | 66 | Head | Farmer | Ohio |
| 23 | Eliza Ferris | 94 | Head | — | Ohio |
| 24 | Susan Ferris | 56 | Twp | Housekeeper | Kentucky |
| 25 | Anna Keffner | 55 | Head | — | Ohio |
| 26 | Edward Olmer | 71 | Boarder | — | Ohio |
| 27 | Eli Haggard | 22 | Head | Laborer | Kentucky |
| 28 | Nora M Haggard | 17 | Wife | — | Ohio |
| 29 | Ruth Fern Haggard | 3 | Daughter | — | Ohio |
| 30 | Loren Glenn Mccalla | 30 | Head | Extractor | Illinois |
| 31 | Marie Mccalla | 24 | Wife | — | Tennessee |
| 32 | Janet Mccalla | 2 | Daughter | — | Ohio |
| 33 | Henry Schwegman | 73 | Head | Farmer | Indiana |
| 34 | Ina Holshult | 65 | Housekeeper | Housekeeper | Ohio |
| 35 | Don Whitaker | 49 | Head | Clerk File | Kentucky |
| 36 | Allie Whitaker | 45 | Wife | — | Kentucky |
| 37 | Don Whitaker | 20 | Son | Salesman | Kentucky |
| 38 | Glenn Whitaker | 20 | Son | Taxi Driver | Kentucky |
| 39 | Ray Whitaker | 16 | Son | — | Kentucky |
| 40 | Ned Whitaker | 13 | Son | — | 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)