MK
Mary Knox — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clark-County, Ohio
Our Model Tree links this Mary Knox across the 1930 and 1940 US Censuses in Clark-County, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
Female
Daughter
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clark-County, Ohio |
| Surname | Knox |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Pleasant Twp. |
| 1935 Residence (County) | Clark |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Pleasant Twp |
| Est. Birth Year | ~1927 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dale Knox | Son | — | 5 | ~1935 |
| Carl Knox | Head | — | 40 | ~1900 |
| Robert Knox | Son | — | 17 | ~1923 |
| Ruth Knox | Spouse | — | 38 | ~1902 |
| Janet Knox | Daughter | — | 3 | ~1937 |
| Willard Knox | Son | — | 20 | ~1920 |
| Mary Knox | Daughter | — | 13 | ~1927 |
| Carl Knox | Son | — | 8 | ~1932 |
Census Appearances
1930
Clark, Ohio
Daughter, age 3
Clark, Ohio · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knox |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Clark-County, Ohio
Daughter, age 13
Clark-County, Ohio · implied b. ~1927 — 8 household members
| Surname | Knox |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Pleasant Twp. |
| 1935 Residence (County) | Clark |
| Highest Grade | No 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 Knox across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knox
Daughter · 1940 · age 13 · b. ~1927 · Ohio
★ You are viewing this record
Sibling
Dale Knox
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Knox
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Willard Knox
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Knox
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Knox
Sibling · 1940 · age 8
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 — Clark-County, Ohio
Open full size
1940 US Federal Census — Clark-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03038-00513)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Teets | 3 | daughter | — | — |
| 2 | Donna Teets | 1 | daughter | — | — |
| 3 | Ansel Knox | 42 | head | Body Assembler | Ohio |
| 4 | Aletha Knox | 35 | wife | — | Ohio |
| 5 | Edward Knox | 16 | son | — | Ohio |
| 6 | Lois Knox | 6 | daughter | — | Ohio |
| 7 | Martha Knox | 3 | daughter | — | — |
| 8 | James Knox | 2 | son | — | — |
| 9 | Mitchell Harrington | 38 | head | Farm Laborer | Ohio |
| 10 | Etta Harrington | 32 | wife | — | Ohio |
| 11 | Eugene Harrington | 14 | son | — | Ohio |
| 12 | Helen Harrington | 13 | daughter | — | Ohio |
| 13 | Alice Harrington | 10 | daughter | — | Ohio |
| 14 | Mary Harrington | 8 | daughter | — | Ohio |
| 15 | Norman Harrington | 6 | son | — | Ohio |
| 16 | Donald Harrington | 4 | son | — | — |
| 17 | Frances Harrington | 1 | daughter | — | — |
| 18 | Jennie Sailor | 60 | head | — | Ohio |
| 19 | John Ballard | 53 | head | Farm Laborer | Ohio |
| 20 | Mary Ballard | 52 | wife | — | Ohio |
| 21 | Wanda Ballard | 15 | daughter | — | Ohio |
| 22 | Roy Ballard | 11 | son | — | Ohio |
| 23 | Harry Ballard | 39 | brother | — | Ohio |
| 24 | Carl Knox | 40 | head | Farm Operator | Ohio |
| 25 | Ruth Knox | 38 | wife | — | Ohio |
| 26 | Willard Knox | 20 | son | Sheep Shearer | Ohio |
| 27 | Robert Knox | 17 | son | Farm Laborer | Ohio |
| 28 | Mary Knox THIS PERSON | 13 | daughter | — | Ohio |
| 29 | Carl Jr. Knox | 8 | son | — | Ohio |
| 30 | Dale Knox | 5 | son | — | Ohio |
| 31 | Janet Knox | 3 | daughter | — | — |
| 32 | Amos Ballard | 60 | head | Livestock Buyer | Ohio |
| 33 | Alverta Ballard | 23 | daughter | — | Ohio |
| 34 | Opal Ballard | 19 | daughter | — | Ohio |
| 35 | Floyd Ballard | 14 | son | — | Ohio |
| 36 | Willis Ballard | 25 | head | Foreign Packer | Ohio |
| 37 | Doris Ballard | 23 | wife | — | Ohio |
| 38 | Arnold Ballard | 3 | son | — | — |
| 39 | Foster Ballard | 31 | head | Packing Inspector | Ohio |
| 40 | Freda Ballard | 26 | 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)