HC
Harold Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this Harold Cook across the 1910, 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Alonzo & William — first a head (b.~1909), then head of a 4-person household.
Age 31
b. ~1909
Male
Head
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Cook |
| Given Name | Harold E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Printer |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 2578 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Printer |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1909 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Cook | Head | — | 31 | ~1909 |
| L Cook | Other | — | 60 | ~1880 |
| Melba Cook | Spouse | — | 26 | ~1914 |
| Ronald Cook | Son | — | 5 | ~1935 |
Census Appearances
1910
Marion, Indiana
Son, age
Marion, Indiana · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Herbert H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1920
Marion, Indiana
Son, age 10
Marion, Indiana · implied b. ~1910 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 21
Marion, Indiana · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Harold C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Painter |
| Industry | News Paper Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Head, age 31
Marion-County, Indiana · implied b. ~1909 — 4 household members
| Surname | Cook |
| Given Name | Harold E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Printer |
| Industry | Newspaper |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 2578 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Alonzo Cook (~0.92 confidence) and father William Cook (~0.92 confidence) and mother Belva Cook (~0.92 confidence) and mother Gertrude Cook (~0.92 confidence) and mother Lydia Cook (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Alonzo Cook
b. ~1875
Source father
● Household
· direct · ~0.92
Father
William Cook
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Belva Cook
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Gertrude Cook
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Lydia Cook
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Cook
Head · 1940 · age 31 · b. ~1909 · Indiana
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01122-00707)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lowell Jr. Mcquenney | 1 | Son | — | Indiana |
| 42 | Robert E. Farmer | 54 | Head | Hair Stylist | Indiana |
| 43 | Eva M. Farmer | 56 | Wife | — | Ohio |
| 44 | Jane Farmer | 14 | Daughter | — | Indiana |
| 45 | Felix Maria | 32 | Head | Asst Sales Mgr. | Indiana |
| 46 | Ruth Maria | 30 | Wife | — | Indiana |
| 47 | Richard Lee Maria | 8 | Son | — | Indiana |
| 48 | John E. Dugan | 51 | Head | Sheet Metal Worker | Indiana |
| 49 | Flora E. Dugan | 48 | Wife | — | Indiana |
| 50 | Dorothy Dugan | 16 | Daughter | — | Indiana |
| 51 | Alice Dugan | 10 | Daughter | — | Indiana |
| 52 | Richard Dugan | 23 | Son | Pipefitter | Indiana |
| 53 | Edward Dittrich | 65 | Head | Foreman | Indiana |
| 54 | Catherine Dittrich | 65 | Wife | — | Indiana |
| 55 | Kathryn Dittrich | 21 | Daughter | — | Indiana |
| 56 | James L. Blottman | 67 | Head | Salesman | Ohio |
| 57 | Catherine Blottman | 67 | Wife | — | Indiana |
| 58 | Homer J. Snyder | 52 | Head | Draftsman | Indiana |
| 59 | Josephine Snyder | 50 | Wife | — | Indiana |
| 60 | Lois Ann Snyder | 24 | Daughter | Comptometer | Indiana |
| 61 | James K. Robbins | 56 | Head | Clerk | Indiana |
| 62 | Bertha Robbins | 50 | Wife | — | Indiana |
| 63 | William J. Robbins | 17 | Son | — | Indiana |
| 64 | Harley Deon | 34 | Head | Truck Driver | Indiana |
| 65 | Ruth Deon | 28 | Wife | — | Tennessee |
| 66 | Lester Oliver | 13 | Step-son | — | Indiana |
| 67 | Harold E. Cook THIS PERSON | 31 | Head | Printer | Indiana |
| 68 | Melba C. Cook | 26 | Wife | — | Indiana |
| 69 | Ronald L. Cook | 5 | Son | — | Indiana |
| 70 | L. Ersie Cook | 60 | Mother | — | Indiana |
| 71 | John A. Murphy | 42 | Head | Salesman | Indiana |
| 72 | Hazel V. Murphy | 38 | Wife | — | Kentucky |
| 73 | Martha Ann Murphy | 7 | Daughter | — | Indiana |
| 74 | John Kent Murphy | 1 | Son | — | Indiana |
| 75 | Martha Jones | 73 | Mother-in-law | — | Illinois |
| 77 | George Newman | 73 | Head | Carpenter | Ohio |
| 78 | Nellie M. Newman | 66 | Wife | — | Indiana |
| 79 | Claude M. Newman | 49 | Son | Scarfitter | Indiana |
| 80 | John Lowery | 35 | Head | Salesman | Kentucky |
Pedigree Summary
Harold
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)