HC
Harry Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mendocino-County, California
Our Model Tree links this Harry Cooper across the 1920, 1930 and 1940 US Censuses in Mendocino-County, California (XGBoost, ~Confirmed) — first a head (b.~1885), then head of a 3-person household.
Age 55
b. ~1885
Male
Head
Born: Oregon
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mendocino-County, California |
| Surname | Cooper |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Willits |
| 1935 Residence (County) | Mendocino |
| Additional Details | |
| Occupation | Locomotive engineer |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2200 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Occupation | Locomotive Engineer |
| Township / Ward | Willits |
| Est. Birth Year | ~1885 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harry | Age | Birth yr |
|---|---|---|---|---|
| Laverne Cooper | Daughter | — | 29 | ~1911 |
| Edith Cooper | Spouse | — | 50 | ~1890 |
| Harry Cooper | Head | — | 55 | ~1885 |
Census Appearances
1920
Mendocino, California
Head, age 34
Mendocino, California · implied b. ~1886 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Harry A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Oregon |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Locomotive Engineer |
| Industry | Rail Road |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1930
Mendocino, California
Head, age 44
Mendocino, California · implied b. ~1886 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Harry A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Oregon |
| Age at First Marriage | 23 |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | California |
| Occupation | Engineer |
| Industry | Steam Railroad |
| Class of Worker | 8977 |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2000 |
| Radio Set | R |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Mendocino-County, California
Head, age 55
Mendocino-County, California · implied b. ~1885 — 3 household members
| Surname | Cooper |
| Given Name | Harry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | Willits |
| 1935 Residence (County) | Mendocino |
| Occupation | Locomotive engineer |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2200 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Harry Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Harry Cooper
Head · 1940 · age 55 · b. ~1885 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Mendocino-County, California
Open full size
1940 US Federal Census — Mendocino-County, California
Page Contents
24 people indexed on this census page (nara:1940:m-t0627-00263-00195)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Jack Brewer | 38 | Head | Truck Driver | California |
| 42 | Harry Cooper THIS PERSON | 55 | Head | Locomotive Engineer | Oregon |
| 43 | Edith Cooper | 50 | Wife | — | California |
| 44 | Laverne Cooper | 29 | Daughter | — | California |
| 45 | Raymond Hall | 55 | Head | Car Inspector | Nebraska |
| 46 | Cecile Hall | 53 | Wife | — | Colorado |
| 48 | Frances Hell | 22 | Head | Bookkeeper | California |
| 49 | Val Peterson | 39 | Head | Proprietor | Wisconsin |
| 50 | Constance Peterson | 22 | Wife | — | California |
| 54 | Harry Galbreath | 22 | Head | Clerk | California |
| 55 | Wesley Millard | 32 | Head | Carpenter | California |
| 56 | Julia Millard | 24 | Wife | — | Texas |
| 57 | Mary Millard | 3 | Daughter | — | California |
| 58 | Luella Millard | 1 | Daughter | — | California |
| 61 | Charles Bean | 25 | Head | Laborer | California |
| 62 | Pearl Bean | 24 | Wife | Beauty Operator | California |
| 64 | Donald Scruggins | 23 | Head | Dishwasher | California |
| 66 | Gladys Cave | 29 | Head | Grade Teacher | California |
| 68 | Charles F. Henny | 28 | Head | English Teacher | Missouri |
| 70 | William A. Tobin | 37 | Head | Manager | California |
| 71 | William S. Hall | 41 | Head | Manager | California |
| 72 | Dolores Goetz Minear | 23 | Head | Elementary Teacher | California |
| 74 | Paul Elmer Respondo | 50 | Head | Kitchen Helper | Illinois |
| 76 | William A. Jamieson | 25 | Head | Ranger | California |
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)