JB
John Blackburn — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this John Blackburn across the 1920, 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed), with identified parents Frank & Lizzie — first a head (b.~1913), then head of a 3-person household.
Age 27
b. ~1913
Male
Head
Born: Indiana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Blackburn |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | pharm clerk |
| Industry | Drugstore |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1000 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Pharm Clerk |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1913 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Jesse Blackburn | Spouse | — | 22 | ~1918 |
| Barbara Blackburn | Daughter | — | ~1940 | |
| John Blackburn | Head | — | 27 | ~1913 |
Census Appearances
1920
Marion, Indiana
Son, age 7
Marion, Indiana · implied b. ~1913 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Marion, Indiana
Son, age 17
Marion, Indiana · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Kentucky |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Head, age 27
Marion-County, Indiana · implied b. ~1913 — 3 household members
| Surname | Blackburn |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | pharm clerk |
| Industry | Drugstore |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1000 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Blackburn (~0.92 confidence) and mother Lizzie Blackburn (~0.92 confidence) and mother Mary Jones (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Blackburn
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Lizzie Blackburn
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Mary Jones
b. ~1858
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Blackburn
Head · 1940 · age 27 · b. ~1913 · Indiana
★ 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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01131-01020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John H. Blackburn THIS PERSON | 27 | Head | Pharm Clerk | Indiana |
| 2 | Jesse Blackburn | 22 | Wife | — | Georgia |
| 3 | Barbara Blackburn | 0 | Daughter | — | Indiana |
| 4 | June Farmer | 36 | Head | — | Indiana |
| 5 | William J. Farmer | 7 | Daughter | — | Indiana |
| 6 | Shirley A. Farmer | 4 | Daughter | — | Indiana |
| 7 | John Brooks | 59 | Father | — | Indiana |
| 8 | John D. Cavanaugh | 20 | Head | Laborer | Indiana |
| 9 | Grace Cavanaugh | 20 | Wife | — | Georgia |
| 10 | Lester Jr. Cavanaugh | 1 | Son | — | Indiana |
| 11 | Ernest Williams | 27 | Head | Laborer | Alabama |
| 12 | Alice Williams | 23 | Wife | — | Indiana |
| 13 | Ernest Jr. Williams | 5 | Son | — | Indiana |
| 14 | Donald S. Williams | 0 | Son | — | Indiana |
| 15 | Samuel Johnson | 72 | Head | Laborer | S. Carolina |
| 16 | Rose Johnson | 56 | Wife | — | N. Carolina |
| 17 | Nathaniel Howard | 35 | Head | Porter | Tennessee |
| 18 | Fern Howard | 26 | Wife | — | Indiana |
| 19 | Dock Brady | 39 | Head | Laborer | Tennessee |
| 20 | Lara Brady | 27 | Wife | — | Ohio |
| 21 | Frank Ford | 56 | Head | Laborer | Tennessee |
| 22 | Clement Pilliner | 31 | Head | Truck Driver | Mississippi |
| 23 | Lennie Pilliner | 29 | Wife | Maid | Tennessee |
| 24 | Donner Irene Pilliner | 4 | Daughter | — | Tennessee |
| 25 | Arthur H. Sears | 28 | Head | Porter | Tennessee |
| 26 | Alivon Sears | 22 | Wife | Maid | Indiana |
| 27 | Benetta Sears | 4 | Daughter | — | Indiana |
| 28 | Frank Radford | 27 | Head | Laborer | Kentucky |
| 29 | Emma Radford | 21 | Wife | — | Indiana |
| 30 | Francis Radford | 5 | Daughter | — | Indiana |
| 31 | Barbara J. Radford | 3 | Daughter | — | Indiana |
| 32 | George Radford | 29 | Brother | Laborer | Kentucky |
| 33 | Verona Radford | 28 | Wife | — | Indiana |
| 34 | William Stovall | 33 | Head | Laborer | Kentucky |
| 35 | Hilda Stovall | 27 | Wife | — | Louisiana |
| 36 | William Stovall | 11 | Son | — | Louisiana |
| 37 | Kenneth Stovall | 9 | Son | — | Illinois |
| 38 | Goldie Mccauley | 30 | Head | — | Indiana |
| 39 | Joseph Mccauley | 11 | Son | — | Indiana |
| 40 | Thomas Lee Mccauley | 9 | Son | — | Indiana |
Pedigree Summary
John
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)