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Mary Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Laurens-County, South Carolina
Our Model Tree links this Mary Blackwell across the 1930 and 1940 US Censuses in Laurens-County, South Carolina (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Laurens-County, South Carolina |
| Surname | Blackwell |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Laurens |
| Additional Details | |
| Industry | 0 |
| Class of Worker | no |
| Highest Grade | No 4 |
| 1935 Residence | South Carolina |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Township / Ward | Sullivan |
| Est. Birth Year | ~1925 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alline Blackwell | Spouse | — | 37 | ~1903 |
| Martha Blackwell | Daughter | — | 13 | ~1927 |
| Mary Blackwell | Daughter | — | 15 | ~1925 |
| David Blackwell | Head | — | 42 | ~1898 |
| Dorothy Blackwell | Daughter | — | 9 | ~1931 |
| Jamie Blackwell | Daughter | — | 11 | ~1929 |
| J Blackwell | Son | — | 17 | ~1923 |
| James Blackwell | Son | — | 19 | ~1921 |
Census Appearances
1930
Laurens, South …
Daughter, age 5
Laurens, South Carolina · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mary S. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | none |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Laurens-County, South …
Daughter, age 15
Laurens-County, South Carolina · implied b. ~1925 — 8 household members
| Surname | Blackwell |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Laurens |
| Industry | 0 |
| Class of Worker | no |
| Highest Grade | No 4 |
| 1935 Residence | South Carolina |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
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 Blackwell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Blackwell
Daughter · 1940 · age 15 · b. ~1925 · South Carolina
★ You are viewing this record
Sibling
J Blackwell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Blackwell
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Blackwell
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Blackwell
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jamie Blackwell
Sibling · 1940 · age 11
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 — Laurens-County, South Carolina
Open full size
1940 US Federal Census — Laurens-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03821-01014)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Kathryn Bagwell | 15 | Daughter | — | South Carolina |
| 42 | Helen L. Bagwell | 13 | Daughter | — | South Carolina |
| 43 | Mary Frances Bagwell | 11 | Daughter | — | South Carolina |
| 44 | David H. Blackwell | 42 | Head | Farmer | South Carolina |
| 45 | Alline Blackwell | 37 | Wife | — | South Carolina |
| 46 | James H. Blackwell | 19 | Son | Laborer | South Carolina |
| 47 | J. Richard Blackwell | 17 | Son | — | South Carolina |
| 48 | Mary A. Blackwell THIS PERSON | 15 | Daughter | — | South Carolina |
| 49 | Martha E. Blackwell | 13 | Daughter | — | South Carolina |
| 50 | Jamie J. Blackwell | 11 | Daughter | — | South Carolina |
| 51 | Dorothy B. Blackwell | 9 | Daughter | — | South Carolina |
| 52 | Alberta Pollard | 25 | Head | — | South Carolina |
| 53 | James M. Pollard | 5 | Son | — | South Carolina |
| 54 | Ira M. Bolt | 39 | Head | Farmer | South Carolina |
| 55 | Lois M. Bolt | 16 | Daughter | — | South Carolina |
| 56 | M. Julia Bolt | 12 | Daughter | — | South Carolina |
| 57 | Gertie M. Bolt | 37 | Sister | — | South Carolina |
| 58 | Alice Belle Bolt | 32 | Sister | — | South Carolina |
| 59 | Henry Madden | 42 | Head | Farmer | South Carolina |
| 60 | Annetta Madden | 39 | Wife | — | South Carolina |
| 61 | James H. Madden | 16 | Son | — | South Carolina |
| 62 | Willie Mae Madden | 20 | Son | Laborer | South Carolina |
| 63 | Azilee Madden | 17 | Daughter | — | South Carolina |
| 64 | Nancy Mae Madden | 4 | Granddaughter | — | South Carolina |
| 65 | Jesse S. Tollison | 35 | Head | Farmer | South Carolina |
| 66 | Verline Tollison | 33 | Wife | — | South Carolina |
| 67 | Billy M. Tollison | 7 | Son | — | South Carolina |
| 68 | Ben Steele Tollison | 5 | Son | — | South Carolina |
| 69 | J. Stevens Tollison | 3 | Son | — | South Carolina |
| 70 | John B. Tollison | 1 | Son | — | South Carolina |
| 71 | Rosa Lee Hill | 46 | Head | Laborer | South Carolina |
| 72 | Jodie Mae Hill | 18 | Daughter | Cook | South Carolina |
| 73 | Burket L. Hill | 11 | Son | — | South Carolina |
| 74 | Ollie Hill | 5 | Son | — | South Carolina |
| 75 | James Johnson | 22 | Son in law | Laborer | South Carolina |
| 76 | Chaddy Johnson | 21 | Daughter | — | South Carolina |
| 77 | Lula Mae Johnson | 4 | Granddaughter | — | South Carolina |
| 78 | Lou Eugnia Johnson | 1 | Granddaughter | — | South Carolina |
| 79 | Thomas Fuller | 31 | Head | Farmer | South Carolina |
| 80 | Alice Fuller | 30 | Wife | — | South Carolina |
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)