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John Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Massac-County, Illinois
Our Model Tree links this John Blackwell across the 1920, 1930 and 1940 US Censuses in Massac-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1873), then head of a 6-person household.
Age 67
b. ~1873
Male
Head
Born: Tennessee
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Massac-County, Illinois |
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Tennessee |
| 1935 Residence (City) | Brooklyn Precinct |
| 1935 Residence (County) | Massac |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
| Township / Ward | Brooklyn Precinct |
| Est. Birth Year | ~1873 |
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 |
|---|---|---|---|---|
| Roscoe Blackwell | Son | — | 15 | ~1925 |
| Jess Blackwell | Son | — | 22 | ~1918 |
| John Blackwell | Head | — | 67 | ~1873 |
| Sara Blackwell | Spouse | — | 59 | ~1881 |
| Inez Wright | Other | — | 7 | ~1933 |
| Loretta Blackwell | Daughter | — | 18 | ~1922 |
Census Appearances
1920
Massac, Illinois
Head, age 46
Massac, Illinois · implied b. ~1874 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Tennessee |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
1930
Massac, Illinois
Head, age 57
Massac, Illinois · implied b. ~1873 — 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 | 57 |
| Marital Status | Married |
| Birthplace | Tennessee |
| Age at First Marriage | 25 |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | Farmer |
| Industry | Gen farming |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | 500 |
| Veteran | O |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
1940
Massac-County, Illinois
Head, age 67
Massac-County, Illinois · implied b. ~1873 — 6 household members
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Tennessee |
| 1935 Residence (City) | Brooklyn Precinct |
| 1935 Residence (County) | Massac |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Tennessee |
| Birth Country | United States |
| Birthplace (normalized) | tennessee |
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 67 · b. ~1873 · Illinois
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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 — Massac-County, Illinois
Open full size
1940 US Federal Census — Massac-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00856-00063)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Monal Blasdel | 5 | son | — | Illinois |
| 42 | J. E. Rogers | 27 | head | Farmer | Illinois |
| 43 | Mildred Rogers | 20 | wife | — | Illinois |
| 44 | James Rogers | 2 | son | — | Illinois |
| 45 | Donald Rogers | 0 | son | — | Illinois |
| 46 | Annie D. Kepp | 80 | head | — | Ohio |
| 47 | William Schaffer | 53 | head | Farmer | Illinois |
| 48 | Emma Schaffer | 53 | wife | — | Illinois |
| 49 | N. A. Booker | 50 | head | Mechanic | Kentucky |
| 50 | Hester Booker | 55 | wife | — | Kentucky |
| 51 | James Rhymes | 65 | head | Farmer | Louisiana |
| 52 | Fannie Rhymes | 58 | wife | — | Mississippi |
| 53 | John Blackwell THIS PERSON | 67 | head | — | Tennessee |
| 54 | Sara Blackwell | 59 | wife | — | Tennessee |
| 55 | Jess Blackwell | 22 | son | Farm Hand | Illinois |
| 56 | Loretta Blackwell | 18 | daughter | — | Illinois |
| 57 | Roscoe Blackwell | 15 | son | — | Illinois |
| 58 | Inez Wright | 7 | grandchild | — | Illinois |
| 59 | Sevel Warfield | 25 | head | Laborer | Illinois |
| 60 | Roberta Warfield | 19 | wife | — | Illinois |
| 61 | Charles Warfield | 2 | son | — | Illinois |
| 62 | David Simmons | 28 | head | Farm Hand | Tennessee |
| 63 | Frank Mcmahan | 38 | head | Proprietor | Illinois |
| 64 | Ida Mcmahan | 38 | wife | Retail Clerk | Illinois |
| 65 | Dortha Mary Sharp | 18 | stepchild | — | Illinois |
| 66 | Billie J. Mcmahan | 13 | daughter | — | Illinois |
| 67 | H. F. Gordon | 51 | head | R.R. Engineer | Illinois |
| 68 | Mable Gordon | 48 | wife | — | Illinois |
| 69 | Kenneth Gordon | 26 | son | Editor | Illinois |
| 70 | H. B. Heffenson | 42 | head | Lockman | Illinois |
| 71 | Nanie Heffenson | 39 | wife | — | Illinois |
| 72 | Alma Heffenson | 17 | daughter | — | Illinois |
| 73 | Lenora Heffenson | 16 | daughter | — | Illinois |
| 74 | Lester Heffenson | 14 | son | — | Illinois |
| 75 | Amy Heffenson | 12 | daughter | — | Illinois |
| 76 | Waonita Heffenson | 9 | daughter | — | Illinois |
| 77 | Neil Heffenson | 1 | daughter | — | Illinois |
| 78 | Fannie Madglin | 46 | head | Teacher | Illinois |
| 79 | Robert Slagle | 30 | head | — | Illinois |
| 80 | Roselia Slagle | 30 | 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)