HC
Harold Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Jefferson-County, Pennsylvania
Our Model Tree links this Harold Cook across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Jacob & Joseph — first a son (b.~1915), then head of a 5-person household.
Age 25
b. ~1915
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Pennsylvania |
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Perry Twp |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm Hand |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 288 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Farmer |
| Township / Ward | Perry Twp |
| Est. Birth Year | ~1915 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Jane Cook | Daughter | — | 21 | ~1919 |
| Joseph Cook | Head | — | 64 | ~1876 |
| Sophronia Means | Other | — | 84 | ~1856 |
| Addie Cook | Spouse | — | 51 | ~1889 |
| Harold Cook | Son | — | 25 | ~1915 |
Census Appearances
1920
Jefferson, Pennsylvania
Son, age 5
Jefferson, Pennsylvania · implied b. ~1915 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Jefferson, Pennsylvania
Son, age 15
Jefferson, Pennsylvania · implied b. ~1915 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Jefferson-County, Pennsylvania
Son, age 25
Jefferson-County, Pennsylvania · implied b. ~1915 — 5 household members
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Perry Twp |
| 1935 Residence (County) | Jefferson |
| Occupation | Farmer |
| Industry | Farm Hand |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 288 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Jacob Cook (~0.92 confidence) and father Joseph Cook (~0.92 confidence) and father O Cook (~0.92 confidence) and mother Addie Cook (~0.92 confidence) and mother Addie Cook (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jacob Cook
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Joseph Cook
b. ~1876
Source father
● Household
· direct · ~0.92
Father
O Cook
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Addie Cook
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Addie Cook
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Cook
Son · 1940 · age 25 · b. ~1915 · Pennsylvania
★ You are viewing this record
Sibling
Jane Cook
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 — Jefferson-County, Pennsylvania
Open full size
1940 US Federal Census — Jefferson-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03519-00619)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Maude Whitesell | 21 | Wife | — | Pennsylvania |
| 2 | Barbara Whitesell | 2 | Daughter | — | Pennsylvania |
| 3 | Patricia Whitesell | 1 | Daughter | — | Pennsylvania |
| 4 | Daniel M. Bush | 72 | Head | — | Pennsylvania |
| 5 | James Zolner | 23 | Grandson | New Worker | Pennsylvania |
| 6 | Irene Zolner | 23 | Wife | — | Pennsylvania |
| 7 | David Zolner | 4 | Son | — | Pennsylvania |
| 8 | Diane Zolner | 2 | Daughter | — | Pennsylvania |
| 9 | Angus Wilson | 60 | Head | Farmer | Pennsylvania |
| 10 | Phoebe Wilson | 57 | Wife | — | Pennsylvania |
| 11 | Mercedes Wilson | 15 | Daughter | — | Pennsylvania |
| 12 | John C. Mowrey | 56 | Head | Vol. Maint. | Pennsylvania |
| 13 | Fanny Mowrey | 54 | Wife | — | Pennsylvania |
| 14 | Clarence Mowrey | 22 | Son | Farmer | Pennsylvania |
| 15 | Clyde Mowrey | 18 | Son | Farmer | Pennsylvania |
| 16 | Irvine Mowrey | 17 | Daughter | — | Pennsylvania |
| 17 | Edith Mowrey | 14 | Daughter | — | Pennsylvania |
| 18 | Ernest Mowrey | 9 | Grandson | — | Pennsylvania |
| 19 | Lester Mowrey | 7 | Grandson | — | Pennsylvania |
| 20 | Joseph B. Cook | 64 | Head | Farmer | Pennsylvania |
| 21 | Addie Cook | 51 | Wife | — | Pennsylvania |
| 22 | Harold Cook THIS PERSON | 25 | Son | Farmer | Pennsylvania |
| 23 | Jane Cook | 21 | Daughter | Clerk | Pennsylvania |
| 24 | Sophronia Means | 84 | Mother-in-law | — | Pennsylvania |
| 25 | Norris Johnston | 64 | Head | Laborer | Pennsylvania |
| 26 | Mary A. Johnston | 58 | Wife | — | Pennsylvania |
| 27 | Yorda Hull | 63 | Head | — | Pennsylvania |
| 28 | Silas Cresson | 67 | Head | Farmer | Pennsylvania |
| 29 | Loretta Cresson | 60 | Wife | — | Pennsylvania |
| 30 | Blaine Cresson | 40 | Head | Laborer | Pennsylvania |
| 31 | Eleanor Cresson | 37 | Wife | — | Pennsylvania |
| 32 | Walter Cresson | 16 | Son | — | Pennsylvania |
| 33 | Milton Cresson | 8 | Son | — | Pennsylvania |
| 34 | Cynthia Hamilton | 70 | Head | — | Pennsylvania |
| 35 | Grace Hamilton | 35 | Daughter | — | Pennsylvania |
| 36 | Lucas Halls | 40 | Head | Laborer | Pennsylvania |
| 37 | Alma Halls | 37 | Wife | — | Pennsylvania |
| 38 | Martha Halls | 13 | Daughter | — | Pennsylvania |
| 39 | Allen Halls | 11 | Son | — | Pennsylvania |
| 40 | Eleanor Halls | 3 | Daughter | — | Pennsylvania |
Pedigree Summary
Harold + 1 sibling
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)