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Mary Blackburn — 1940 US Census Record
Model Tree available1940 United States Federal Census · Posey-County, Indiana
Our Model Tree links this Mary Blackburn across the 1920, 1930 and 1940 US Censuses in Posey-County, Indiana (XGBoost, ~Confirmed), with identified parents Walter & Martha — first a daughter (b.~1909), then head of a 10-person household.
Age 31
b. ~1909
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Posey-County, Indiana |
| Surname | Blackburn |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (County) | Posey |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Black Township |
| Est. Birth Year | ~1909 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Walter Blackburn | Head | — | 52 | ~1888 |
| Herbert Blackburn | Son | — | 11 | ~1929 |
| Martha Blackburn | Daughter | — | 14 | ~1926 |
| Esther Blackburn | Daughter | — | 27 | ~1913 |
| Elmer Blackburn | Son | — | 18 | ~1922 |
| Martha Blackburn | Spouse | — | 51 | ~1889 |
| Walter Blackburn | Son | — | 20 | ~1920 |
| Mary Blackburn | Daughter | — | 31 | ~1909 |
| Mary Knight | Other | — | 77 | ~1863 |
| James Blackburn | Son | — | 8 | ~1932 |
Census Appearances
1920
Posey, Indiana
Daughter, age 11
Posey, Indiana · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Posey, Indiana
Daughter, age 21
Posey, Indiana · implied b. ~1909 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackburn |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Posey-County, Indiana
Daughter, age 31
Posey-County, Indiana · implied b. ~1909 — 10 household members
| Surname | Blackburn |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (County) | Posey |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| 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 Mary Blackburn across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Walter Blackburn (~0.92 confidence) and mother Martha Blackburn (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Walter Blackburn
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Martha Blackburn
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Blackburn
Daughter · 1940 · age 31 · b. ~1909 · Indiana
★ You are viewing this record
Sibling
Elmer Blackburn
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Blackburn
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Blackburn
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Blackburn
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Blackburn
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Esther Blackburn
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Posey-County, Indiana
Open full size
1940 US Federal Census — Posey-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01087-00208)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Curtis | 2 | Son | — | Indiana |
| 2 | Abijah (X) Alley | 59 | Head | 72 | Illinois |
| 3 | Evelina Alley | 59 | Wife | — | Indiana |
| 4 | Ruth E. Alley | 33 | Daughter | — | Indiana |
| 5 | Louis E. Alley | 31 | Son | 72 | Indiana |
| 6 | Otis B. Alley | 27 | Son | 72 | Indiana |
| 7 | George W. Kreis | 47 | Head | 72 | Indiana |
| 8 | Lockie M. Kreis | 47 | Wife | — | Indiana |
| 9 | Forest Thomas | 51 | Hired hand | 60 | Missouri |
| 10 | James (X) Goodington | 36 | Head | 8 | Kentucky |
| 11 | Walter Blackburn | 52 | Head | 72 | Indiana |
| 12 | Martha (X) Blackburn | 51 | Wife | — | Indiana |
| 13 | Mary C. Blackburn THIS PERSON | 31 | Daughter | — | Indiana |
| 14 | Esther A. Blackburn | 27 | Daughter | — | Indiana |
| 15 | Walter D. Blackburn | 20 | Son | 72 | Indiana |
| 16 | Elmer Blackburn | 18 | Son | 72 | Indiana |
| 17 | Martha Blackburn | 14 | Daughter | — | Indiana |
| 18 | Herbert K. Blackburn | 11 | Son | — | Indiana |
| 19 | James R. Blackburn | 8 | Son | — | Indiana |
| 20 | Mary B. Knight | 77 | Mother in law | — | Indiana |
| 21 | George W. Renschler | 33 | Head | 72 | Indiana |
| 22 | Floella (X) Renschler | 33 | Wife | — | Indiana |
| 23 | Thorold Jr. Renschler | 8 | Son | — | Indiana |
| 24 | Donald G. Renschler | 6 | Son | — | Indiana |
| 25 | Leroy Haug | 18 | Farm hand | 60 | Indiana |
| 26 | William Renschler | 70 | Head | 72 | Indiana |
| 27 | Margaret Renschler | 67 | Wife | — | Indiana |
| 28 | Fred Renschler | 40 | Head | 72 | Indiana |
| 29 | Rosella Renschler | 38 | Wife | — | Indiana |
| 30 | Mary C. Renschler | 18 | Daughter | — | Indiana |
| 31 | Helen J. Renschler | 12 | Daughter | — | Indiana |
| 32 | Melvin O. Renschler | 6 | Son | — | Indiana |
| 33 | Elisha Baxter | 37 | Hired hand | 60 | Indiana |
| 34 | Fred Jr. (X) Kertel | 35 | Head | 72 | Indiana |
| 35 | Edith Kertel | 37 | Wife | — | Indiana |
| 36 | Paul F. Kertel | 15 | Son | — | Indiana |
| 37 | Carolyn A. Kertel | 12 | Daughter | — | Indiana |
| 38 | Oscar H. Isbelhaur|Isbelhauer | 25 | Head | 72 | Indiana |
| 39 | Helen Isbelhaur|Isbelhauer | 21 | Wife | — | Indiana |
| 40 | Henry J. Munsterman | 67 | Head | — | Indiana |
Pedigree Summary
Mary + 6 siblings
Gen 1 · 2 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)