JC
John Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cumberland-County, Maine
Our Model Tree links this John Cook across the 1920, 1930 and 1940 US Censuses in Cumberland-County, Maine (XGBoost, ~Confirmed), with identified parents John & Frank — first a son (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Male
Son
Born: Maine
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cumberland-County, Maine |
| Surname | Cook |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maine |
| 1935 Residence (City) | Portland city |
| 1935 Residence (County) | Cumberland |
| Additional Details | |
| Occupation | Salesman |
| Industry | Wholesale Tea |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
| Occupation | Salesman |
| Township / Ward | Portland City |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Catherine Cook | Daughter | — | 12 | ~1928 |
| John Cook | Head | — | 64 | ~1876 |
| John Cook | Son | — | 23 | ~1917 |
| Norman Cook | Son | — | 17 | ~1923 |
| Albina Cook | Spouse | — | 62 | ~1878 |
Census Appearances
1920
Cumberland, Maine
Son, age 2
Cumberland, Maine · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maine |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1930
Cumberland, Maine
Son, age 12
Cumberland, Maine · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maine |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Can Read/Write | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1940
Cumberland-County, Maine
Son, age 23
Cumberland-County, Maine · implied b. ~1917 — 5 household members
| Surname | Cook |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maine |
| 1935 Residence (City) | Portland city |
| 1935 Residence (County) | Cumberland |
| Occupation | Salesman |
| Industry | Wholesale Tea |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
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 John Cook across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Cook (~0.92 confidence) and father Frank Cook (~0.92 confidence) and father Roland Cook (~0.92 confidence) and mother Albina Cook (~0.92 confidence) and mother Alice Cook (~0.92 confidence) and mother Sarah Cook (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Cook
b. ~1876
Source father
● Household
· direct · ~0.92
Father
Frank Cook
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Roland Cook
b. ~1897
Source father
● Household
· direct · ~0.92
Mother
Albina Cook
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Alice Cook
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Sarah Cook
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Cook
Son · 1940 · age 23 · b. ~1917 · Maine
★ You are viewing this record
Sibling
Norman Cook
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cook
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 — Cumberland-County, Maine
Open full size
1940 US Federal Census — Cumberland-County, Maine
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01475-00880)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Martha London | 32 | Head | Nurse | Maine |
| 2 | Beatrice Curran | 36 | Lodger | Nurse | Maine |
| 3 | Monica Haughey | 36 | Lodger | Nurse | New Hampshire |
| 4 | Marguerite Peterson | 48 | Head | — | New York |
| 5 | Catherine Bruno | 68 | Mother | — | New York |
| 6 | James Mason | 28 | Head | Truck Driver | New Hampshire |
| 7 | Barbara Mason | 26 | Wife | — | Maine |
| 8 | Marie Mason | 64 | Mother | — | Norway |
| 9 | Frank Brown | 67 | Head | — | Maine |
| 10 | Frances Brown | 60 | Wife | — | Maine |
| 11 | Jane Mcneil | 65 | Head | Shoemaker | Maine |
| 12 | Ellen Mcneil | 63 | Sister | — | Maine |
| 13 | Isabell Mcneil | 49 | Sister | Stenographer | Maine |
| 14 | John Mcneil | 69 | Brother | — | Maine |
| 15 | James B. Libby | 57 | Head | Salesman | Maine |
| 16 | May B. Libby | 54 | Wife | — | Canada English |
| 17 | Oscar R. Johnston | 67 | Head | Teacher | Maine |
| 18 | Sylvia T. Johnston | 54 | Wife | — | Maine |
| 19 | Anna Bancroft | 38 | Daughter | — | Maine |
| 20 | Nathie Bancroft | 11 | Granddaughter | — | Maine |
| 21 | Edward Finks | 52 | Head | Proprietor | Russia |
| 22 | Ida Finks | 52 | Wife | — | Maine |
| 23 | Marsha Finks | 22 | Daughter | — | Maine |
| 24 | Alexander Robinson | 51 | Head | Photographer | Turkey |
| 25 | Wilhelmina Robinson | 53 | Wife | — | Massachusetts |
| 26 | Alexander Jr. Robinson | 23 | Son | Photographer | Maryland |
| 27 | Beatrice E. Robinson | 23 | Daughter | Bookkeeper | Maine |
| 28 | Edward G. Robinson | 20 | Son | New Worker | Maine |
| 29 | Gloria C. Robinson | 17 | Daughter | — | Maine |
| 30 | George B. Littlefield | 61 | Head | Postman | Rhode Island |
| 31 | Alice B. Littlefield | 61 | Wife | — | Maine |
| 32 | George W. Littlefield | 17 | Son | — | Maine |
| 33 | John T. Cook | 64 | Head | Fire Inspector | Canada English |
| 34 | Albina Cook | 62 | Wife | — | Canada French |
| 35 | John S. Cook THIS PERSON | 23 | Son | Salesman | Maine |
| 36 | Norman S. Cook | 17 | Son | — | Maine |
| 37 | Catherine A. Cook | 12 | Daughter | — | Maine |
| 38 | Kenneth Percival | 39 | Head | Dental Technician | Maine |
| 39 | Mary Percival | 36 | Wife | — | Maine |
| 40 | Robert Percival | 9 | Son | — | Maine |
Pedigree Summary
John + 2 siblings
Gen 1 · 6 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)