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John Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Missouri
Our Model Tree links this John Blackwell across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Missouri (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 5-person household.
Age 69
b. ~1871
Male
Head
Born: Missouri
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Missouri |
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | Valle Twp |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | Farming |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Farming |
| Township / Ward | Valle Twp |
| Est. Birth Year | ~1871 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Blackwell | Head | — | 69 | ~1871 |
| Vella Blackwell | Spouse | — | 66 | ~1874 |
| Val Blackwell | Son | — | 35 | ~1905 |
| Verna Blackwell | Other | — | 29 | ~1911 |
| Val Blackwell | Other | — | 1 | ~1939 |
Census Appearances
1920
Jefferson, Missouri
Head, age 49
Jefferson, Missouri · implied b. ~1871 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | farmer |
| Industry | general farm |
| Class of Worker | O |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Jefferson, Missouri
Head, age 59
Jefferson, Missouri · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 24 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | Farmer |
| Industry | General |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Jefferson-County, Missouri
Head, age 69
Jefferson-County, Missouri · implied b. ~1871 — 5 household members
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | Valle Twp |
| 1935 Residence (County) | Jefferson |
| Occupation | Farming |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Blackwell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Blackwell
Head · 1940 · age 69 · b. ~1871 · Missouri
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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 — Jefferson-County, Missouri
Open full size
1940 US Federal Census — Jefferson-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02119-00846)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Wader | 11 | Son | — | Missouri |
| 2 | Neal Cole | 68 | Head | Farming | Missouri |
| 3 | Effie Cole | 58 | Wife | — | Missouri |
| 4 | Herbert Cole | 17 | Son | — | Missouri |
| 5 | John Blackwell THIS PERSON | 69 | Head | Farming | Missouri |
| 6 | Vella Blackwell | 66 | Wife | — | Missouri |
| 7 | Val Blackwell | 35 | Son | Laborer | Missouri |
| 8 | Verna Blackwell | 29 | Daughter in law | — | Missouri |
| 9 | Val Jr Blackwell | 1 | Grand son | — | Missouri |
| 10 | Thomas Rawson | 53 | Head | Laborer | Missouri |
| 11 | Martha Rawson | 51 | Wife | — | Missouri |
| 12 | Ruby Rawson | 16 | Daughter | Housework | Missouri |
| 13 | Norma Rawson | 13 | Daughter | — | Missouri |
| 14 | Mable Rawson | 12 | Daughter | — | Missouri |
| 15 | Myrtle Rawson | 10 | Daughter | — | Missouri |
| 16 | Charles W. Rawson | 1 | Son | — | Missouri |
| 17 | James Rawson | 48 | Head | Farming | Missouri |
| 18 | Sadie Rawson | 42 | Wife | — | Missouri |
| 19 | Orville Rawson | 16 | Son | Laborer | Missouri |
| 20 | Florence Rawson | 15 | Daughter | — | Missouri |
| 21 | Arthur Rawson | 12 | Son | — | Missouri |
| 22 | Loretta Rawson | 10 | Daughter | — | Missouri |
| 23 | Lola Paul Rawson | 8 | Daughter | — | Missouri |
| 24 | Geraldine Rawson | 4 | Daughter | — | Missouri |
| 25 | Darlene Rawson | 2 | Daughter | — | Missouri |
| 26 | Earl Ray Rawson | 2 | Son | — | Missouri |
| 27 | Mary Whaley | 67 | Head | — | California |
| 28 | Arthur Whaley | 24 | Son | Laborer | Missouri |
| 29 | Elwood Whaley | 4 | Son | — | Missouri |
| 30 | Ephraim Harris | 44 | Head | Manager & Salesman | Texas |
| 31 | Inez Harris | 42 | Wife | — | Missouri |
| 32 | Wilma Harris | 11 | Daughter | — | Missouri |
| 33 | Dorothy Harris | 8 | Daughter | — | Missouri |
| 34 | Norvel Harris | 5 | Son | — | Missouri |
| 35 | Wesley Blackwell | 68 | Hired man | Laborer | Missouri |
| 36 | Amos Moore | 58 | Head | Farming | Missouri |
| 37 | Minnie Moore | 51 | Wife | — | Missouri |
| 38 | Mary Yates | 66 | Head | — | Missouri |
| 39 | John Yates | 22 | Son | Laborer | Missouri |
| 40 | George Yates | 19 | Son | Laborer | Missouri |
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)