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Mary Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Horry-County, South Carolina
Our Model Tree links this Mary Blackwell across the 1930 and 1940 US Censuses in Horry-County, South Carolina (XGBoost, ~Confirmed) — first a daughter (b.~1914), then head of a 13-person household.
Age 26
b. ~1914
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Horry-County, South Carolina |
| Surname | Blackwell |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Green Sea Township |
| 1935 Residence (County) | Horry |
| Additional Details | |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same house |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Farm Laborer |
| Township / Ward | Green Sea Township |
| Est. Birth Year | ~1914 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Clifton Blackwell | Son | — | 20 | ~1920 |
| Milton Blackwell | Head | — | 56 | ~1884 |
| J Blackwell | Son | — | 12 | ~1928 |
| Bill Manning | Other | — | 16 | ~1924 |
| James Hayes | Other | — | 25 | ~1915 |
| Vollie Blackwell | Son | — | 24 | ~1916 |
| Irene Blackwell | Spouse | — | 52 | ~1888 |
| John Blackwell | Son | — | 9 | ~1931 |
| Clemson Blackwell | Son | — | 18 | ~1922 |
| Cleveland Blackwell | Son | — | 23 | ~1917 |
| Luvodie Blackwell | Daughter | — | 23 | ~1917 |
| Mary Blackwell | Daughter | — | 26 | ~1914 |
| Frontie Blackwell | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Marion, South …
Spouse, age 17
Marion, South Carolina · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | May J. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Married |
| Birthplace | South Carolina |
| Age at First Marriage | 16 |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Farm Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Horry-County, South …
Daughter, age 26
Horry-County, South Carolina · implied b. ~1914 — 13 household members
| Surname | Blackwell |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Green Sea Township |
| 1935 Residence (County) | Horry |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same house |
| 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 26 · b. ~1914 · South Carolina
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Sibling
Clifton Blackwell
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clemson Blackwell
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleveland Blackwell
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Luvodie Blackwell
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vollie Blackwell
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frontie Blackwell
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
J Blackwell
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Blackwell
Sibling · 1940 · age 9
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 — Horry-County, South Carolina
Open full size
1940 US Federal Census — Horry-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03818-00117)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ed Howard | 12 | Son | — | South Carolina |
| 42 | Jane Howard | 9 | Daughter | — | South Carolina |
| 43 | Thomas W Howard | 3 | Son | — | South Carolina |
| 44 | Milton H Blackwell | 56 | Head | Farmer | North Carolina |
| 45 | Irene Blackwell | 52 | Wife | — | South Carolina |
| 46 | Mary E Blackwell THIS PERSON | 26 | Daughter | Farm Laborer | South Carolina |
| 47 | Vollie Blackwell | 24 | Son | Farm Laborer | South Carolina |
| 48 | Cleveland Blackwell | 23 | Son | Farm Laborer | South Carolina |
| 49 | Luvodie Blackwell | 23 | Daughter | Farm Laborer | South Carolina |
| 50 | Clifton Blackwell | 20 | Son | Farm Laborer | South Carolina |
| 51 | Clemson Blackwell | 18 | Son | — | South Carolina |
| 52 | Frontie Blackwell | 15 | Daughter | — | South Carolina |
| 53 | """J C""" Blackwell | 12 | Son | — | South Carolina |
| 54 | John B Blackwell | 9 | Son | — | South Carolina |
| 55 | Bill Manning | 16 | Laborer | Farm Laborer | South Carolina |
| 56 | James Hayes | 25 | Laborer | Farm Laborer | South Carolina |
| 57 | Daniel A Duncan | 54 | Head | Farmer | North Carolina |
| 58 | Sarah Duncan | 52 | Wife | — | South Carolina |
| 59 | Lucian Duncan | 19 | Son | Farm Laborer | South Carolina |
| 60 | Reba Duncan | 15 | Daughter | — | South Carolina |
| 61 | Leo Hayes | 13 | Grand-son | — | South Carolina |
| 62 | Hiram R Cannon | 41 | Head | Farmer | South Carolina |
| 63 | Ella Cannon | 38 | Wife | — | South Carolina |
| 64 | Irene Cannon | 17 | Daughter | Farm Laborer | South Carolina |
| 65 | Vera Cannon | 14 | Daughter | — | North Carolina |
| 66 | Leo Cannon | 11 | Son | — | South Carolina |
| 67 | Guy Jollie | 28 | Head | Farmer | South Carolina |
| 68 | Pearl Jollie | 22 | Wife | — | South Carolina |
| 69 | Lee Jollie | 5 | Son | — | South Carolina |
| 70 | Sterlin Jollie | 3 | Son | — | South Carolina |
| 71 | Leon Carteret | 35 | Head | Farmer | North Carolina |
| 72 | Lula Carteret | 40 | Wife | — | North Carolina |
| 73 | Homer L Carteret | 16 | Son | Farm Laborer | North Carolina |
| 74 | """J B""" Carteret | 14 | Son | Farm Laborer | North Carolina |
| 75 | Eloise Carteret | 10 | Daughter | — | North Carolina |
| 76 | Eva Mae Carteret | 8 | Daughter | — | North Carolina |
| 77 | Betty Joe Carteret | 6 | Daughter | — | North Carolina |
| 78 | Woodrow Carteret | 4 | Son | — | North Carolina |
| 79 | Isadora Carteret | 1 | Daughter | — | North Carolina |
| 80 | James R Pridgen | 47 | Head | Farmer | 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)