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Mary Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Arkansas
Our Model Tree links this Mary Blackwell across the 1930 and 1940 US Censuses in Jefferson-County, Arkansas (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Female
Daughter
Born: Arkansas
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Arkansas |
| Surname | Blackwell |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Arkansas |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Arkansas |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
| Township / Ward | Washington Twp |
| Est. Birth Year | ~1929 |
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 |
|---|---|---|---|---|
| Auggidon Blackwell | Daughter | — | 6 | ~1934 |
| Robert Blackwell | Head | — | 39 | ~1901 |
| Mary Blackwell | Daughter | — | 11 | ~1929 |
| Georgie Blackwell | Son | — | 3 | ~1937 |
| Robert Blackwell | Son | — | 13 | ~1927 |
| Bannie Blackwell | Spouse | — | 31 | ~1909 |
| Herldine Blackwell | Daughter | — | 10 | ~1930 |
| Henrietta Blackwell | Daughter | — | 8 | ~1932 |
Census Appearances
1930
Jefferson, Arkansas
Daughter, age 1
Jefferson, Arkansas · implied b. ~1929 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mary G. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Arkansas |
| Father's Birthplace | Arkansas |
| Mother's Birthplace | Arkansas |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
1940
Jefferson-County, Arkansas
Daughter, age 11
Jefferson-County, Arkansas · implied b. ~1929 — 8 household members
| Surname | Blackwell |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Arkansas |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Jefferson |
| Highest Grade | No 4 |
| 1935 Residence | Arkansas |
| Birth State | Arkansas |
| Birth Country | United States |
| Birthplace (normalized) | arkansas |
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 11 · b. ~1929 · Arkansas
★ You are viewing this record
Sibling
Georgie Blackwell
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herldine Blackwell
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Auggidon Blackwell
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Blackwell
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henrietta Blackwell
Sibling · 1940 · age 8
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 — Jefferson-County, Arkansas
Open full size
1940 US Federal Census — Jefferson-County, Arkansas
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00146-00968)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William E Overton | 73 | Head | Farmer | Arkansas |
| 42 | Belle A Overton | 64 | Wife | — | Arkansas |
| 43 | Harrie S Brunwood | 61 | Head | — | Indiana |
| 44 | Mildred S Brunwood | 17 | Daughter | — | Arkansas |
| 45 | Robert L Blackwell | 39 | Head | Manist | Arkansas |
| 46 | Bannie L Blackwell | 31 | Wife | — | Arkansas |
| 47 | Robert Jr. Blackwell | 13 | Son | — | Arkansas |
| 48 | Mary J Blackwell THIS PERSON | 11 | Daughter | — | Arkansas |
| 49 | Herldine R Blackwell | 10 | Daughter | — | Arkansas |
| 50 | Henrietta A Blackwell | 8 | Daughter | — | Arkansas |
| 51 | Auggidon Blackwell | 6 | Daughter | — | Arkansas |
| 52 | Georgie Lette Blackwell | 3 | Son | — | Arkansas |
| 53 | George S Reed | 33 | Head | Machinist | Arkansas |
| 54 | Elizabeth B Reed | 27 | Wife | — | Arkansas |
| 55 | Virginia A Reed | 8 | Daughter | — | Arkansas |
| 56 | Margaret S Reed | 6 | Daughter | — | Arkansas |
| 57 | Carroll M Monk | 23 | Head | Laborer | Arkansas |
| 58 | Ruth Ann S Monk | 18 | Wife | — | Oklahoma |
| 59 | Amos J Worley | 62 | Head | Farmer | Arkansas |
| 60 | Pharsee O Worley | 32 | Son | — | Arkansas |
| 61 | Anna Bell Langston | 38 | Daughter | — | Arkansas |
| 62 | Morris L Langston | 30 | Head | Molder | Arkansas |
| 63 | Annie G Langston | 22 | Wife | — | Arkansas |
| 64 | Morris Jr. Langston | 1 | Son | — | Arkansas |
| 65 | Elmer D Parks | 36 | Head | Brake Agent | Arkansas |
| 66 | Mary Bell Parks | 31 | Wife | — | Arkansas |
| 67 | Geraldine R Parks | 10 | Daughter | — | Arkansas |
| 68 | Elmer J Parks | 7 | Son | — | Arkansas |
| 69 | Willis W Brunson | 30 | Head | Yard Boy | Arkansas |
| 70 | Marie Brunson | 25 | Wife | — | Arkansas |
| 71 | Fred M Belengrath | 34 | Head | Executive | N. Carolina |
| 72 | Catherine A Belengrath | 33 | Wife | Executive | Arkansas |
| 73 | Fred M Jr. Belengrath | 11 | Son | — | Arkansas |
| 74 | Joe F Belengrath | 7 | Son | — | Arkansas |
| 75 | Jerry D Swift | 57 | Head | Laborer | Arkansas |
| 76 | Goldie A Swift | 42 | Wife | Cook | Arkansas |
| 77 | George D Malden | 62 | Head | Nightwatchman | Alabama |
| 78 | Henry S Pennington | 52 | Head | Pipe Fitter | Arkansas |
| 79 | Ethel R Pennington | 45 | Wife | — | Oklahoma |
| 80 | Velma A Pennington | 22 | Daughter | Sales Lady | Arkansas |
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)