HC
Harold Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Clark-County, Ohio
Our Model Tree links this Harold Cook across the 1920, 1930 and 1940 US Censuses in Clark-County, Ohio (XGBoost, ~Confirmed), with identified parents George & John — first a son (b.~1917), then head of a 8-person household.
Age 23
b. ~1917
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clark-County, Ohio |
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Moorefield Twp |
| 1935 Residence (County) | Clark |
| Additional Details | |
| Occupation | Filling Station Attendant |
| Industry | Service Station |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 416 |
| Highest Grade | No 5 |
| 1935 Residence | Same house |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Filling Station Attendant |
| Township / Ward | Moorefield Twp |
| Est. Birth Year | ~1917 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| John Cook | Son | — | 25 | ~1915 |
| Betty Cook | Daughter | — | 21 | ~1919 |
| Amelia Cook | Spouse | — | 52 | ~1888 |
| John Cook | Head | — | 64 | ~1876 |
| Barbara Cook | Daughter | — | 15 | ~1925 |
| Bonnie Cook | Daughter | — | 6 | ~1934 |
| Harold Cook | Son | — | 23 | ~1917 |
| Martha Cook | Daughter | — | 19 | ~1921 |
Census Appearances
1920
Clark, Ohio
Son, age 3
Clark, Ohio · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read | No |
| Can Write | No |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Clark, Ohio
Son, age 13
Clark, Ohio · implied b. ~1917 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold K. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Clark-County, Ohio
Son, age 23
Clark-County, Ohio · implied b. ~1917 — 8 household members
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Moorefield Twp |
| 1935 Residence (County) | Clark |
| Occupation | Filling Station Attendant |
| Industry | Service Station |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 416 |
| Highest Grade | No 5 |
| 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 Harold Cook across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Cook (~0.92 confidence) and father John Cook (~0.92 confidence) and father John Cook (~0.92 confidence) and mother Amelia Cook (~0.92 confidence) and mother Emelia Cook (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Cook
b. ~1877
Source father
● Household
· direct · ~0.92
Father
John Cook
b. ~1876
Source father
● Household
· direct · ~0.92
Father
John Cook
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Amelia Cook
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Emelia Cook
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Cook
Son · 1940 · age 23 · b. ~1917 · Ohio
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Sibling
Betty Cook
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Cook
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Cook
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bonnie Cook
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cook
Sibling · 1940 · age 25
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-t0627-03038-00437)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eugene Jr. Mckillip | 21 | Son | Farm Laborer | Ohio |
| 2 | Paul Mckillip | 15 | Son | — | Ohio |
| 3 | Robert K. Colvin | 35 | Head | Pattern Maker | Ohio |
| 4 | Evelyn Colvin | 28 | Wife | — | Ohio |
| 5 | Connie Jean Colvin | 5 | Daughter | — | Ohio |
| 6 | James Colvin | 3 | Son | — | Ohio |
| 7 | Frank T. Jones | 68 | Head | Farm Laborer | Ohio |
| 8 | Peter Pohland | 41 | Head | Fruit Grower | Germany |
| 9 | Laura Pohland | 37 | Wife | Saleslady | Ohio |
| 10 | Evelyn Pohland | 14 | Daughter | — | Ohio |
| 11 | Wilbur Pohland | 9 | Son | — | Ohio |
| 12 | William H. Howry | 66 | Head | Carpenter | Ohio |
| 13 | Richard B. Howry | 26 | Son | Assistant Pressman | Ohio |
| 14 | John Cook | 64 | Head | Farmer | Ohio |
| 15 | Amelia Cook | 52 | Wife | — | Ohio |
| 16 | John Nicholas Cook | 25 | Son | Filling Station Attendant | Ohio |
| 17 | Harold Cook THIS PERSON | 23 | Son | Filling Station Attendant | Ohio |
| 18 | Betty Cook | 21 | Daughter | — | Ohio |
| 19 | Martha Cook | 19 | Daughter | New Worker | Ohio |
| 20 | Barbara Cook | 15 | Daughter | — | Ohio |
| 21 | Bonnie Cook | 6 | Daughter | — | Ohio |
| 22 | James Ludman | 31 | Head | Salesman | Ohio |
| 23 | Dorothy Ludman | 29 | Wife | — | Ohio |
| 24 | Wilber L. Gard | 73 | Head | Accountant | Ohio |
| 25 | Grace Gard | 65 | Wife | — | Ohio |
| 26 | Elwood C. Murrey | 41 | Head | Foreman Machine Shop | Ohio |
| 27 | Ellen S. Murrey | 42 | Wife | — | Ohio |
| 28 | Floyd E. Martin | 43 | Head | Manager | Ohio |
| 29 | Florence A. Martin | 40 | Wife | — | Ohio |
| 30 | Roger E. Martin | 13 | Son | — | Ohio |
| 31 | Joyce A. Martin | 9 | Daughter | — | Ohio |
| 32 | Peter G. Katsolis | 28 | Head | Claim Agent | Wisconsin |
| 33 | Helen Katsolis | 36 | Wife | Clerk | Ohio |
| 34 | William E. Raider | 18 | Step-son | — | Ohio |
| 35 | James W. Saunders | 57 | Father-in-law | Bricklayer | Ohio |
| 36 | Howard Yoder | 34 | Head | Assembler | Ohio |
| 37 | Mary Yoder | 34 | Wife | Clerical | Ohio |
| 38 | Joseph H. Roth | 28 | Head | Salesman | Ohio |
| 39 | Mary F. Roth | 26 | Wife | — | Ohio |
| 40 | Warren D. Van Ness | 71 | Head | — | Ohio |
Related Census Records
Pedigree Summary
Harold + 5 siblings
Gen 1 · 5 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)