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John Cowan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this John Cowan across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 7-person household.
Age 25
b. ~1915
Male
Son
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | South Gate City |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Occupation | Mill-man |
| Industry | Rubber Co |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 400 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Mill-Man |
| Township / Ward | South Gate City |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cowan | Spouse | — | 50 | ~1890 |
| Rita Cowan | Daughter | — | 21 | ~1919 |
| Joseph Cowan | Son | — | 19 | ~1921 |
| Edwin Cowan | Son | — | 18 | ~1922 |
| Arthur Cowan | Son | — | 23 | ~1917 |
| John Cowan | Son | — | 25 | ~1915 |
| Arthur Cowan | Head | — | 50 | ~1890 |
Census Appearances
1930
Los Angeles, …
Son, age 15
Los Angeles, California · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Oregon |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Los-Angeles-County, California
Son, age 25
Los-Angeles-County, California · implied b. ~1915 — 7 household members
| Surname | Cowan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | South Gate City |
| 1935 Residence (County) | Los Angeles |
| Occupation | Mill-man |
| Industry | Rubber Co |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 400 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Cowan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cowan
Son · 1940 · age 25 · b. ~1915 · California
★ You are viewing this record
Sibling
Rita Cowan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edwin Cowan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cowan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Cowan
Sibling · 1940 · age 23
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 — 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-t0627-00247-00348)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bruce Irvin | 7 | Son | — | California |
| 2 | Ivan Butcher | 32 | Head | Foreman | West Virginia |
| 3 | Edna Butcher | 31 | Wife | — | England |
| 4 | Dorothy Butcher | 5 | Daughter | — | California |
| 5 | Louis H Scheuerman | 65 | Head | Tool Maker | Illinois |
| 6 | Hillnette Scheuerman | 63 | Wife | Tool Dresser | Iowa |
| 7 | Guy Whitney | 45 | Head | Manager | Iowa |
| 8 | Loretta Whitney | 41 | Wife | — | Massachusetts |
| 9 | Leo Whitney | 16 | Son | — | California |
| 10 | Edna Sims | 1 | Lodger | — | California |
| 11 | Earl Sims | 6 | Lodger | — | California |
| 12 | Albert G Burnett | 62 | Head | Carpenter | Missouri |
| 13 | Mary E Burnett | 53 | Wife | — | Kansas |
| 14 | Wayne Burnett | 16 | Son | — | California |
| 15 | Charles Ketcham | 39 | Brother-in-law | Core Maker | Kansas |
| 16 | Arthur H Cowan | 50 | Head | Laborer | Oregon |
| 17 | Margaret Cowan | 50 | Wife | — | Pennsylvania |
| 18 | John Cowan THIS PERSON | 25 | Son | Mill-Man | Colorado |
| 19 | Arthur Cowan | 23 | Son | Office Man | Colorado |
| 20 | Rita Cowan | 21 | Daughter | Checker | Colorado |
| 21 | Joseph Cowan | 19 | Son | Plastic | Colorado |
| 22 | Edwin Cowan | 18 | Son | New Worker | Colorado |
| 23 | Francis L Bennett | 42 | Head | Minister | California |
| 24 | Margaret Bennett | 40 | Wife | Minister | Iowa |
| 25 | Ruth Bennett | 13 | Daughter | — | California |
| 26 | Jeanne Bennett | 12 | Daughter | — | California |
| 27 | Carol Bennett | 4 | Daughter | — | California |
| 28 | Louis Blevens | 33 | Head | Manager | Illinois |
| 29 | Christine Blevens | 29 | Wife | — | Ohio |
| 30 | Harold L Peade | 42 | Head | Druggist | California |
| 31 | Addie L Peade | 39 | Wife | — | California |
| 32 | Caroline Peade | 19 | Daughter | — | California |
| 33 | Harold Jr Peade | 15 | Son | — | California |
| 34 | Marilyn Peade | 13 | Daughter | — | California |
| 35 | Herbert D Marias | 45 | Lodger | Salesman | New York |
| 36 | Hilford Whitacre | 41 | Head | Estimator | Oklahoma |
| 37 | Lillian Whitacre | 40 | Wife | Saleslady | Michigan |
| 38 | Donald Whitacre | 16 | Son | — | California |
| 39 | Roger Whitacre | 15 | Son | — | California |
| 40 | Kate Gorman | 67 | Mother | — | Canada |
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)