JC
John Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this John Cook across the 1920, 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed), with identified parents James & Elizabeth — first a head (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Male
Head
Born: Kentucky
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Cook |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Lawrence |
| Additional Details | |
| Occupation | Electrician |
| Industry | Motion Picture |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 3800 |
| Highest Grade | 8 |
| 1935 Residence | Kansas |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
| Occupation | Electrician |
| Township / Ward | Los Angeles City |
| Est. Birth Year | ~1900 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Martha Cook | Daughter | — | 6 | ~1934 |
| John Cook | Head | — | 40 | ~1900 |
| Murray Cook | Son | — | 4 | ~1936 |
| Jessie Cook | Spouse | — | 40 | ~1900 |
Census Appearances
1920
Los Angeles, …
Son, age 20
Los Angeles, California · implied b. ~1900 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | John W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Kentucky |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | Station Clerk |
| Industry | Railroad Co |
| Class of Worker | W |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1930
Los Angeles, …
Head, age 30
Los Angeles, California · implied b. ~1900 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | John W |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Kentucky |
| Age at First Marriage | 24 |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Occupation | Electrician |
| Industry | Motion Picture |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Radio Set | R |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
1940
Los-Angeles-County, California
Head, age 40
Los-Angeles-County, California · implied b. ~1900 — 4 household members
| Surname | Cook |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Kentucky |
| 1935 Residence (City) | Lawrence |
| Occupation | Electrician |
| Industry | Motion Picture |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 3800 |
| Highest Grade | 8 |
| 1935 Residence | Kansas |
| Birth State | Kentucky |
| Birth Country | United States |
| Birthplace (normalized) | kentucky |
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 James Cook (~0.92 confidence) and mother Elizabeth Cook (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Cook
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Cook
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Cook
Head · 1940 · age 40 · b. ~1900 · California
★ 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 — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00376-00222)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Walter Masterson | 29 | Head | Sound Technician | California |
| 2 | Claire Masterson | 28 | Wife | — | Missouri |
| 3 | Hugh Quigley | 57 | Head | Salesman | Ohio |
| 4 | Viola Quigley | 55 | Wife | — | Ohio |
| 5 | Lionel Kelly | 37 | Head | Pro-Manager | England |
| 6 | Evelyn Kelly | 32 | Wife | — | Texas |
| 7 | Ralph Kelly | 9 | Son | — | California |
| 8 | Sheila Kelly | 4 | Daughter | — | California |
| 9 | Charles R. Shaw | 37 | Head | Asst. Treas. | Utah |
| 10 | Mildred Shaw | 31 | Wife | — | Missouri |
| 11 | Charline Shaw | 8 | Daughter | — | California |
| 12 | Harry Simmons | 50 | Head | Mech. Engineer | Indiana |
| 13 | Eileen Simmons | 48 | Wife | — | California |
| 14 | Duncan Stewart | 30 | Head | Artist | Michigan |
| 15 | Mabel Stewart | 31 | Wife | — | California |
| 16 | Joseph M. Kelley | 43 | Head | Makeup-Artist | Idaho |
| 17 | Annie Kelley | 38 | Wife | — | Arizona |
| 18 | William Kelley | 16 | Son | — | California |
| 19 | Hubert Head | 25 | Head | Singer | New Jersey |
| 20 | Albert Head | 58 | Father | Gardener | England |
| 21 | Martha E. Head | 55 | Mother | — | England |
| 22 | James Thompson | 34 | Head | P.B.X. Operator | Arkansas |
| 23 | Alma P. Thompson | 32 | Wife | — | California |
| 24 | Block #143 Begins. Block #142 Ends Here. | None | — | — | — |
| 25 | Hubert Graham | 43 | Head | Electrician | Tennessee |
| 26 | Lillian Graham | 27 | Wife | — | California |
| 27 | Hubert Jr. Graham | 20 | Son | Laborer | Texas |
| 28 | Jane Graham | 19 | Daughter | Secretary | California |
| 29 | John W. Cook THIS PERSON | 40 | Head | Electrician | Kentucky |
| 30 | Jessie Cook | 40 | Wife | — | Nebraska |
| 31 | Martha Cook | 6 | Daughter | — | California |
| 32 | Murray Cook | 4 | Son | — | California |
| 33 | Luisa Fandora | 39 | Head | Supervisor | Mexico |
| 34 | Lucille Fandora | 36 | Wife | — | Minnesota |
| 35 | Lenore Fandora | 2 | Daughter | — | Arizona |
| 36 | Richard Card | 32 | Head | Gardener | Illinois |
| 37 | Arlene Card | 32 | Wife | — | Iowa |
| 38 | Caroline Card | 5 | Daughter | — | California |
| 39 | Diane Card | 2 | Daughter | — | California |
| 40 | Robert Ballard | 26 | Head | Musician | New York |
Pedigree Summary
John
Gen 1 · 2 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)