JC
John Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Knox-County, Illinois
Our Model Tree links this John Cooper across the 1920, 1930 and 1940 US Censuses in Knox-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 7-person household.
Age 63
b. ~1877
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Illinois |
| Surname | Cooper |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Ill |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Maquon Twp |
| Est. Birth Year | ~1877 |
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 |
|---|---|---|---|---|
| John Cooper | Head | — | 63 | ~1877 |
| Walden Cooper | Other | — | 3 | ~1937 |
| Mildred Cooper | Other | — | 32 | ~1908 |
| Shirley Cooper | Other | — | 11 | ~1929 |
| Phylis Cooper | Other | — | 6 | ~1934 |
| Clarence Cooper | Son | — | 36 | ~1904 |
| Rossala Cooper | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Knox, Illinois
Head, age 42
Knox, Illinois · implied b. ~1878 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | John W |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Knox, Illinois
Head, age 52
Knox, Illinois · implied b. ~1878 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | John W |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 21 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | O |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Knox-County, Illinois
Head, age 63
Knox-County, Illinois · implied b. ~1877 — 7 household members
| Surname | Cooper |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Knox |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Ill |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cooper
Head · 1940 · age 63 · b. ~1877 · Illinois
★ 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 — Knox-County, Illinois
Open full size
1940 US Federal Census — Knox-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00827-00206)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles D. Thurman | 54 | Head | Farmer | Illinois |
| 2 | Mary E. Thurman | 55 | Wife | — | Iowa |
| 3 | Leona Thurman | 51 | Wife | — | Missouri |
| 4 | Reece Thurman | 32 | Son | Farmer | Illinois |
| 5 | Wilda Thurman | 18 | Daughter | — | Illinois |
| 6 | Geneva Scudder | 21 | Stepdaughter | Teacher | Illinois |
| 7 | Leonard B. Jones | 56 | Head | Farmer | Missouri |
| 8 | Hazel Jones | 44 | Wife | — | Illinois |
| 9 | John W. Cooper THIS PERSON | 63 | Head | Farmer | Illinois |
| 10 | Rossala Cooper | 58 | Wife | — | Illinois |
| 11 | Clarence E. Cooper | 36 | Son | Farmer | Illinois |
| 12 | Mildred R. Cooper | 32 | Daughter-in-law | — | Illinois |
| 13 | Shirley J. Cooper | 11 | Granddaughter | — | Illinois |
| 14 | Phylis Cooper | 6 | Granddaughter | — | Illinois |
| 15 | Walden Cooper | 3 | Grandson | — | Illinois |
| 16 | Ernest V. Swanson | 34 | Head | Farmer | Illinois |
| 17 | Edith M. Swanson | 34 | Wife | — | Illinois |
| 18 | Norma Jean Swanson | 9 | Daughter | — | Illinois |
| 19 | Joann Swanson | 3 | Daughter | — | Illinois |
| 20 | Floyd Martin | 23 | Head | Laborer | Illinois |
| 21 | Alice Martin | 22 | Wife | — | Illinois |
| 22 | Floyd J. Martin | 2 | Son | — | Illinois |
| 23 | Orrin R. Turner | 52 | Head | Farmer | Illinois |
| 24 | Iva M. Turner | 44 | Wife | — | Illinois |
| 25 | Eugene H. Turner | 24 | Son | Trucker | Illinois |
| 26 | Hattie Turner | 15 | Daughter | — | Illinois |
| 27 | Melvin Turner | 13 | Son | — | Illinois |
| 28 | Lloyd Turner | 11 | Son | — | Illinois |
| 29 | Opal Turner | 9 | Daughter | — | Illinois |
| 30 | Erling Christenson | 26 | Lodger | Farmhand | Nebraska |
| 31 | Earl A. Smith | 46 | Head | Farmer | Illinois |
| 32 | Nellie J. Smith | 42 | Wife | — | Illinois |
| 33 | Ethel W. Smith | 10 | Daughter | — | Illinois |
| 34 | Ray Slagel | 39 | Head | Farmer | Illinois |
| 35 | Alice K. Slagel | 37 | Wife | — | Illinois |
| 36 | Dale L. Slagel | 5 | Son | — | Illinois |
| 37 | Gerald D. Slagel | 3 | Son | — | Illinois |
| 38 | Lewis Slagel | 78 | Head | Retired | Illinois |
| 39 | Landrine E. Brooks | 63 | Head | Laborer | Illinois |
| 40 | Elsie Brooks | 42 | Wife | — | Illinois |
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)