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John Blackburn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Seminole-County, Oklahoma
Our Model Tree links this John Blackburn across the 1930 and 1940 US Censuses in Seminole-County, Oklahoma (XGBoost, ~Confirmed) — first a head (b.~1906), then head of a 10-person household.
Age 34
b. ~1906
Male
Head
Born: Oklahoma
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Seminole-County, Oklahoma |
| Surname | Blackburn |
| Given Name | John A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Miller Township |
| 1935 Residence (County) | Seminole |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
| Occupation | Farmer |
| Township / Ward | Miller Township |
| Est. Birth Year | ~1906 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Nelly Blackburn | Spouse | — | 32 | ~1908 |
| Irene Blackburn | Daughter | — | 8 | ~1932 |
| Howard Blackburn | Son | — | 6 | ~1934 |
| Will Blackburn | Son | — | ~1940 | |
| Jesse Blackburn | Son | — | 3 | ~1937 |
| Eugene Blackburn | Son | — | 1 | ~1939 |
| Eula Blackburn | Daughter | — | 5 | ~1935 |
| Mary Blackburn | Other | — | 69 | ~1871 |
| Alvenia Blackburn | Daughter | — | 2 | ~1938 |
| John Blackburn | Head | — | 34 | ~1906 |
Census Appearances
1930
Seminole, Oklahoma
Other, age 24
Seminole, Oklahoma · implied b. ~1906
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Blackburn |
| Given Name | John W. |
| Relationship to Head | Brother |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Arkansas |
| Occupation | Roustabout |
| Industry | Oil field |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
1940
Seminole-County, Oklahoma
Head, age 34
Seminole-County, Oklahoma · implied b. ~1906 — 10 household members
| Surname | Blackburn |
| Given Name | John A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Miller Township |
| 1935 Residence (County) | Seminole |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
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 Blackburn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Blackburn
Head · 1940 · age 34 · b. ~1906 · Oklahoma
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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 — Seminole-County, Oklahoma
Open full size
1940 US Federal Census — Seminole-County, Oklahoma
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03331-00774)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Milton Eberlee | 19 | Head | Farm Helper | Arkansas |
| 42 | Lillie Eberlee | 16 | Daughter | — | Oklahoma |
| 43 | Alice Eberlee | 13 | Daughter | — | Oklahoma |
| 44 | Florence Eberlee | 11 | Daughter | — | Oklahoma |
| 45 | Edna Eberlee | 9 | Daughter | — | Oklahoma |
| 46 | John A Blackburn THIS PERSON | 34 | Head | Farmer | Oklahoma |
| 47 | Nelly Blackburn | 32 | Wife | — | Oklahoma |
| 48 | Irene Blackburn | 8 | Daughter | — | Oklahoma |
| 49 | Howard Blackburn | 6 | Son | — | Oklahoma |
| 50 | Eula May Blackburn | 5 | Daughter | — | Oklahoma |
| 51 | Jesse Blackburn | 3 | Son | — | Oklahoma |
| 52 | Alvenia Blackburn | 2 | Daughter | — | Oklahoma |
| 53 | Eugene Blackburn | 1 | Son | — | Oklahoma |
| 54 | Will Earl Blackburn | 0 | Son | — | Oklahoma |
| 55 | Mary Blackburn | 69 | Mother | — | Tennessee |
| 56 | G. R. Payne | 40 | Head | Common Labor | Ind. Territory |
| 57 | Ola Payne | 32 | Wife | — | Oklahoma |
| 58 | Willie Jesse | 40 | Head | Farmer | Ind. Territory |
| 59 | Elsie Jesse | 28 | Wife | — | Oklahoma |
| 60 | Marie Jesse | 3 | Daughter | — | Oklahoma |
| 61 | Jim Leftwich | 34 | Head | Laborer | Oklahoma |
| 62 | Effie R Leftwich | 30 | Wife | — | Oklahoma |
| 63 | Edward Leftwich | 11 | Son | — | Oklahoma |
| 64 | Mary Ellen Leftwich | 10 | Daughter | — | Oklahoma |
| 65 | James Leftwich | 4 | Son | — | Oklahoma |
| 66 | Willie Knight | 29 | Head | Farmer | Oklahoma |
| 67 | Icy Knight | 25 | Wife | — | Arkansas |
| 68 | Billy Joe Knight | 7 | Son | — | Oklahoma |
| 69 | Sidney O Birdwell | 37 | Head | Farmer | Oklahoma |
| 70 | Maude Birdwell | 37 | Wife | — | Oklahoma |
| 71 | Loyd Birdwell | 16 | Son | — | Oklahoma |
| 72 | Helen Birdwell | 15 | Daughter | — | Oklahoma |
| 73 | Wavana Birdwell | 6 | Daughter | — | Oklahoma |
| 74 | Velma Birdwell | 6 | Daughter | — | Oklahoma |
| 75 | Anita Birdwell | 5 | Daughter | — | Oklahoma |
| 76 | R. H. Villard | 36 | Head | Farm Labor | Oklahoma |
| 77 | Alzada Villard | 34 | Wife | — | Arkansas |
| 78 | Lester Villard | 15 | Son | — | Oklahoma |
| 79 | Bill Villard | 13 | Son | — | Oklahoma |
| 80 | Louise Villard | 10 | Daughter | — | Oklahoma |
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)