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Mary Blackwell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Northumberland-County, Virginia
Our Model Tree links this Mary Blackwell across the 1920, 1930 and 1940 US Censuses in Northumberland-County, Virginia (XGBoost, ~Confirmed), with identified parents Nelson & Willie — first a daughter (b.~1917), then head of a 13-person household.
Age 23
b. ~1917
Female
Daughter
Born: Virginia
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Northumberland-County, Virginia |
| Surname | Blackwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Fairfields District |
| 1935 Residence (County) | Northumberland |
| Additional Details | |
| Hours Worked | 30 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Township / Ward | Fairfields District |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| William Blackwell | Son | — | 7 | ~1933 |
| Margaret Blackwell | Daughter | — | 17 | ~1923 |
| Ines Blackwell | Daughter | — | 26 | ~1914 |
| Edward Blackwell | Son | — | 21 | ~1919 |
| Anna Blackwell | Daughter | — | 19 | ~1921 |
| Linie Blackwell | Son | — | 10 | ~1930 |
| Mary Blackwell | Daughter | — | 23 | ~1917 |
| Marie Blackwell | Daughter | — | 13 | ~1927 |
| Leon Blackwell | Son | — | 10 | ~1930 |
| Doris Blackwell | Daughter | — | 9 | ~1931 |
| Eugene Blackwell | Son | — | 27 | ~1913 |
| Mary Blackwell | Spouse | — | 49 | ~1891 |
| Willie Blackwell | Head | — | 49 | ~1891 |
Census Appearances
1920
Northumberland, Virginia
Daughter, age 4
Northumberland, Virginia · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1930
Northumberland, Virginia
Daughter, age 13
Northumberland, Virginia · implied b. ~1917 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mary Lou |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Can Read/Write | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
Northumberland-County, Virginia
Daughter, age 23
Northumberland-County, Virginia · implied b. ~1917 — 13 household members
| Surname | Blackwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Fairfields District |
| 1935 Residence (County) | Northumberland |
| Hours Worked | 30 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Nelson Blackwell (~0.92 confidence) and father Willie Blackwell (~0.92 confidence) and father Wilson Blackwell (~0.92 confidence) and mother Mary Blackwell (~0.92 confidence) and mother Mary Blackwell (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Nelson Blackwell
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Willie Blackwell
b. ~1891
Source father
● Household
· direct · ~0.92
Father
Wilson Blackwell
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mary Blackwell
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Mary Blackwell
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Blackwell
Daughter · 1940 · age 23 · b. ~1917 · Virginia
★ You are viewing this record
Sibling
Linie Blackwell
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Blackwell
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Blackwell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Blackwell
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Blackwell
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leon Blackwell
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ines Blackwell
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Blackwell
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Blackwell
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Blackwell
Sibling · 1940 · age 13
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 — Northumberland-County, Virginia
Open full size
1940 US Federal Census — Northumberland-County, Virginia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04280-00524)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | R. V. Ranna | 42 | Head | Foreman | Virginia |
| 42 | Georgia Ranna | 37 | Wife | Housewife | Virginia |
| 43 | Alma Ranna | 19 | Daughter | — | Virginia |
| 44 | Doris Ranna | 17 | Daughter | — | Virginia |
| 45 | Georgia Ranna | 11 | Daughter | — | Virginia |
| 46 | Lola Ranna | 7 | Daughter | — | Virginia |
| 47 | Willie Blackwell | 49 | Head | Foreman | Virginia |
| 48 | Mary Blackwell | 49 | Wife | Housewife | Virginia |
| 49 | Eugene Blackwell | 27 | Son | Laborer | Virginia |
| 50 | Ines Blackwell | 26 | Daughter | — | Virginia |
| 51 | Mary Blackwell THIS PERSON | 23 | Daughter | — | Virginia |
| 52 | Edward Blackwell | 21 | Son | Laborer | Virginia |
| 53 | Anna Blackwell | 19 | Daughter | — | Virginia |
| 54 | Margaret Blackwell | 17 | Daughter | — | Virginia |
| 55 | Marie Blackwell | 13 | Daughter | — | Virginia |
| 56 | Linie Blackwell | 10 | Son | — | Virginia |
| 57 | Leon Blackwell | 10 | Son | — | Virginia |
| 58 | Doris Blackwell | 9 | Daughter | — | Virginia |
| 59 | William Blackwell | 7 | Son | — | Virginia |
| 60 | Levi Blackwell | 40 | Head | Foreman | Virginia |
| 61 | Ada Blackwell | 40 | Wife | Housewife | Virginia |
| 62 | William Blackwell | 21 | Son | Laborer | Virginia |
| 63 | Grace Blackwell | 15 | Daughter | — | Virginia |
| 64 | Mary Blackwell | 13 | Daughter | — | Virginia |
| 65 | Wallace Blackwell | 9 | Son | — | Virginia |
| 66 | Robert Blackwell | 7 | Son | — | Virginia |
| 67 | Bertha Blackwell | 5 | Daughter | — | Virginia |
| 68 | L. W. Sydnor | 55 | Head | Foreman | Virginia |
| 69 | Eunice Sydnor | 52 | Wife | Housewife | Virginia |
| 70 | William Sydnor | 25 | Son | Laborer | Virginia |
| 71 | Lucie Sydnor | 24 | Daughter | — | Virginia |
| 72 | Jamie Sydnor | 22 | Daughter | — | Virginia |
| 73 | Herbert Sydnor | 18 | Son | — | Virginia |
| 74 | Leslie Sydnor | 15 | Son | — | Virginia |
| 75 | Lawrence Sydnor | 13 | Son | — | Virginia |
| 76 | Lola Trigle | 65 | Head | — | Virginia |
| 77 | Bessie Trigle | 43 | Daughter | — | Virginia |
| 78 | John Trigle | 39 | Son | Laborer | Virginia |
| 79 | David Trigle | 37 | Son | Laborer | Virginia |
| 80 | Delia Trigle | 35 | Son | — | Virginia |
Related Census Records
Pedigree Summary
Mary + 10 siblings
Gen 1 · 5 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)