MB
Mary Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Northumberland-County, Virginia
Our Model Tree links this Mary Blackwell across the 1930 and 1940 US Censuses in Northumberland-County, Virginia (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
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 | 13 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Fairfields District |
| 1935 Residence (County) | Northumberland |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Township / Ward | Fairfields District |
| Est. Birth Year | ~1927 |
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 |
|---|---|---|---|---|
| Mary Blackwell | Daughter | — | 13 | ~1927 |
| Ada Blackwell | Spouse | — | 40 | ~1900 |
| Wallace Blackwell | Son | — | 9 | ~1931 |
| Grace Blackwell | Daughter | — | 15 | ~1925 |
| William Blackwell | Son | — | 21 | ~1919 |
| Levi Blackwell | Head | — | 40 | ~1900 |
| Robert Blackwell | Son | — | 7 | ~1933 |
| Bertha Blackwell | Daughter | — | 5 | ~1935 |
Census Appearances
1930
Northumberland, Virginia
Daughter, age 2
Northumberland, Virginia · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mary Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
Northumberland-County, Virginia
Daughter, age 13
Northumberland-County, Virginia · implied b. ~1927 — 8 household members
| Surname | Blackwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Virginia |
| 1935 Residence (City) | Fairfields District |
| 1935 Residence (County) | Northumberland |
| Highest Grade | No 6 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Blackwell
Daughter · 1940 · age 13 · b. ~1927 · Virginia
★ You are viewing this record
Sibling
Grace Blackwell
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wallace Blackwell
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Blackwell
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bertha Blackwell
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Blackwell
Sibling · 1940 · age 21
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 | 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 THIS PERSON | 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 |
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)