MF
Mary Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Erie-County, Ohio
Our Model Tree links this Mary Frederick across the 1930 and 1940 US Censuses in Erie-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, Ohio |
| Surname | Frederick |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Perkins Twp |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | School |
| Highest Grade | 6 |
| 1935 Residence | Same Place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | School |
| Township / Ward | Perkins Twp |
| Est. Birth Year | ~1929 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dolores Lippert | Other | — | 17 | ~1923 |
| Mary Frederick | Daughter | — | 11 | ~1929 |
| Thomas Frederick | Son | — | 7 | ~1933 |
| Joan Frederick | Daughter | — | 9 | ~1931 |
| Robert Frederick | Son | — | 12 | ~1928 |
| Jacob Frederick | Head | — | 37 | ~1903 |
| Stanley Frederick | Son | — | 14 | ~1926 |
| Kenneth Fox | Son | — | 5 | ~1935 |
| Mildred Frederick | Spouse | — | 33 | ~1907 |
Census Appearances
1930
Erie, Ohio
Daughter, age 1
Erie, Ohio · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Mary F. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Erie-County, Ohio
Daughter, age 11
Erie-County, Ohio · implied b. ~1929 — 9 household members
| Surname | Frederick |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Perkins Twp |
| 1935 Residence (County) | Erie |
| Occupation | School |
| Highest Grade | 6 |
| 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 11 · b. ~1929 · Ohio
★ You are viewing this record
Sibling
Kenneth Fox
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Frederick
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Frederick
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Frederick
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Frederick
Sibling · 1940 · age 12
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 — Erie-County, Ohio
Open full size
1940 US Federal Census — Erie-County, Ohio
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-03063-00361)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas Fox | 57 | Head | Farmer | Ohio |
| 2 | Catherine Fox | 53 | Wife | House Wife | Ohio |
| 3 | William Fox | 30 | Son | Farm Helper | Ohio |
| 4 | Harold Fox | 25 | Son | Assembler | Ohio |
| 5 | Gertrude Fox | 15 | Daughter | School | Ohio |
| 6 | Emery Fox | 13 | Son | School | Ohio |
| 7 | Charles Fox | 11 | Son | School | Ohio |
| 8 | Sherman Fox | 24 | Son | Laborer | Ohio |
| 9 | Margaret Fox | 19 | Daughter-in-law | House Wife | Ohio |
| 10 | Frances L. Fox | 2 | Granddaughter | — | Ohio |
| 11 | Sherman Jr. Fox | 0 | Grandson | — | Ohio |
| 12 | Emery Fox | 59 | Head | Farmer | Ohio |
| 13 | Doris Fox | 27 | Wife | Farmer | Ohio |
| 14 | Eleanor Fox | 22 | Wife | House Wife | Ohio |
| 15 | Elbert Hartley | 49 | Head | Farmer | England |
| 16 | Henrietta Hartley | 45 | Wife | House Wife | Ohio |
| 17 | Betty Jane Hartley | 16 | Daughter | Home | Ohio |
| 18 | John E. Hartley | 18 | Son | Farm Helper | Ohio |
| 19 | Catherine M. Hartley | 13 | Daughter | School | Ohio |
| 20 | Florence Hartley | 11 | Daughter | School | Ohio |
| 21 | Eunice Hartley | 9 | Daughter | School | Ohio |
| 22 | Harriet Hartley | 69 | Head | Housekeeping | England |
| 23 | Charles Yearick | 54 | Head | Carpenter | Ohio |
| 24 | Omie B. Yearick | 53 | Wife | House Wife | Ohio |
| 25 | Russel Yearick | 27 | Son | Laborer | Ohio |
| 26 | Jacob Frederick | 37 | Head | Sailor | Ohio |
| 27 | Mildred Frederick | 33 | Wife | Assembler | Ohio |
| 28 | Stanley Frederick | 14 | Son | School | Ohio |
| 29 | Robert Frederick | 12 | Son | School | Ohio |
| 30 | Mary Frederick THIS PERSON | 11 | Daughter | School | Ohio |
| 31 | Joan Frederick | 9 | Daughter | School | Ohio |
| 32 | Thomas Frederick | 7 | Son | School | Ohio |
| 33 | Dolores Lippert | 17 | Cousin | House Work | Ohio |
| 34 | Kenneth Fox | 5 | Son | — | Ohio |
| 35 | Geo. Beebe | 60 | Head | Farmer | Ohio |
| 36 | Blanche Beebe | 65 | Wife | House Wife | 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)