JC
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.~1927), then head of a 6-person household.
Age 13
b. ~1927
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Cowan |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Altadena |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | La Canada |
| Est. Birth Year | ~1927 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Doris Cowan | Daughter | — | 14 | ~1926 |
| John Cowan | Son | — | 13 | ~1927 |
| Carolyn Cowan | Spouse | — | 34 | ~1906 |
| John Cowan | Head | — | 36 | ~1904 |
| Robert Cowan | Son | — | 8 | ~1932 |
| Margaret Runbeck | Other | — | 17 | ~1923 |
Census Appearances
1930
Los Angeles, …
Son, age 3
Los Angeles, California · implied b. ~1927 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cowan |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Mass |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Son, age 13
Los-Angeles-County, California · implied b. ~1927 — 6 household members
| Surname | Cowan |
| Given Name | John D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Altadena |
| 1935 Residence (County) | Los Angeles |
| Highest Grade | No 7 |
| 1935 Residence | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 13 · b. ~1927 · California
★ You are viewing this record
Sibling
Doris Cowan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cowan
Sibling · 1940 · age 8
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-t0627-00232-00606)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Santa Clara Dykeman | 51 | Head | — | Iowa |
| 42 | Oliver J. Hammer | 44 | Head | Mail Carrier | Iowa |
| 43 | Elsie S. Hammer | 37 | Wife | — | Kansas |
| 44 | Donald J. Hammer | 14 | Son | — | California |
| 45 | Ruth A. Hammer | 7 | Daughter | — | California |
| 46 | Aimeric W. Seymour | 44 | Head | Manufacturer | England |
| 47 | Helen P. Seymour | 40 | Wife | — | New York |
| 48 | Doris R. Seymour | 12 | Daughter | — | California |
| 49 | John M. Cowan | 36 | Head | Asst. Admt. Dept. | Massachusetts |
| 50 | Carolyn B. Cowan | 34 | Wife | — | Pennsylvania |
| 51 | Doris E. Cowan | 14 | Daughter | — | California |
| 52 | John D. Cowan THIS PERSON | 13 | Son | — | California |
| 53 | Robert D. Cowan | 8 | Son | — | California |
| 54 | Margaret L. Runbeck | 17 | Lodger | Maid | S. Dakota |
| 55 | William Hopkins | 37 | Head | Personal Manager | Texas |
| 56 | Lila Hopkins | 33 | Wife | — | Kansas |
| 57 | Joan Hopkins | 10 | Daughter | — | California |
| 58 | William Jr. Hopkins | 6 | Son | — | California |
| 59 | Stella Jones | 35 | Lodger | Maid | — |
| 60 | Charles Fishburn | 40 | Head | Executive | Missouri |
| 61 | Louise Fishburn | 34 | Wife | — | Tennessee |
| 62 | Randy Fishburn | 11 | Daughter | — | California |
| 63 | Eugene Jr. Weston | 44 | Head | Architect | California |
| 64 | Beatrice Weston | 44 | Wife | — | Arizona |
| 65 | Eugene 3Rd Weston | 15 | Son | — | California |
| 66 | Russel Weston | 12 | Son | — | California |
| 67 | Jane Weston | 5 | Daughter | — | California |
| 68 | Robert Oslund | 46 | Head | Physician | Montana |
| 69 | Genevieve Oslund | 38 | Wife | — | Wisconsin |
| 70 | Ronald Oslund | 11 | Son | — | Illinois |
| 71 | Ruth Oslund | 6 | Daughter | — | California |
| 72 | Franklin W. Kohler | 78 | Head | — | Pennsylvania |
| 73 | Cornelia P. Kohler | 47 | Wife | — | Missouri |
| 74 | Harvey H. Duryee | 69 | Head | Broker | New York |
| 75 | Grace H. Duryee | 65 | Wife | — | New York |
| 76 | Edwin J. Cutting | 37 | Head | Salesman | Honolulu |
| 77 | Elizabeth D. Cutting | 35 | Wife | — | California |
| 78 | Warren D. Cutting | 11 | Son | — | California |
| 79 | Mary E. Cutting | 3 | Daughter | — | California |
| 80 | Thomas F. Knight | 58 | Head | Secretary | Minnesota |
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)