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Mary Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sumter-County, South Carolina
Our Model Tree links this Mary Brock across the 1930 and 1940 US Censuses in Sumter-County, South Carolina (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sumter-County, South Carolina |
| Surname | Brock |
| Given Name | Mary E. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Sumter |
| Additional Details | |
| Highest Grade | No 6 |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Township / Ward | Sumter |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Benjamin Brock | Head | — | 56 | ~1884 |
| Benjamin Brock | Son | — | 24 | ~1916 |
| Josephine Brock | Daughter | — | 9 | ~1931 |
| Josephine Brock | Spouse | — | 48 | ~1892 |
| Wilbert Brock | Son | — | 13 | ~1927 |
| Mary Brock | Daughter | — | 11 | ~1929 |
Census Appearances
1930
Sumter, South …
Daughter, age 4
Sumter, South Carolina · implied b. ~1926 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 4 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Sumter-County, South …
Daughter, age 11
Sumter-County, South Carolina · implied b. ~1929 — 6 household members
| Surname | Brock |
| Given Name | Mary E. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Sumter |
| Highest Grade | No 6 |
| 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 Brock across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Brock
Daughter · 1940 · age 11 · b. ~1929 · South Carolina
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Sibling
Wilbert Brock
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Brock
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Brock
Sibling · 1940 · age 24
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 — Sumter-County, South Carolina
Open full size
1940 US Federal Census — Sumter-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03842-00309)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Freddie Kennedy | 19 | son | — | South Carolina |
| 2 | Gus Kennedy | 42 | brother | Servant | South Carolina |
| 3 | James D. Scott | 60 | Head | Carry Mail | South Carolina |
| 4 | Sallie Scott | 45 | wife | — | South Carolina |
| 5 | Mary Scott | 27 | daughter | Teacher | South Carolina |
| 6 | Roosevelt Wilder | 35 | Head | Labourer | South Carolina |
| 7 | Bernice Wilder | 27 | wife | — | South Carolina |
| 8 | Hattie Wilder | 15 | daughter | — | North Carolina |
| 9 | Lavern Wilder | 14 | daughter | — | North Carolina |
| 10 | James Wilder | 12 | son | — | North Carolina |
| 11 | Parnlee Wilder | 8 | daughter | — | North Carolina |
| 12 | Rebecca Kelley | 27 | Head | — | South Carolina |
| 13 | Beulah Kelley | 7 | daughter | — | South Carolina |
| 14 | Corine Mims | 24 | sister | Servant | South Carolina |
| 15 | Benjamin Brock | 56 | Head | Carpenter | South Carolina |
| 16 | Josephine Brock | 48 | wife | — | South Carolina |
| 17 | Benjamin Jr. Brock | 24 | son | Labourer | Florida |
| 18 | Wilbert Brock | 13 | son | — | South Carolina |
| 19 | Mary E. Brock THIS PERSON | 11 | daughter | — | South Carolina |
| 20 | Josephine Brock | 9 | daughter | — | South Carolina |
| 21 | Anthony Armstrong | 36 | Head | Clergyman | Texas |
| 22 | Signora Armstrong | 35 | wife | — | Mississippi |
| 23 | Ellen Armstrong | 4 | daughter | — | Alabama |
| 24 | Anthony Jr. Armstrong | 2 | son | — | South Carolina |
| 25 | Fred Johnson | 37 | Head | Laborer | South Carolina |
| 26 | Marie Johnson | 35 | wife | — | South Carolina |
| 27 | Elrita Johnson | 15 | daughter | — | South Carolina |
| 28 | Charles Johnson | 14 | son | — | South Carolina |
| 29 | Edward Johnson | 12 | son | — | South Carolina |
| 30 | Roland Johnson | 9 | son | — | South Carolina |
| 31 | Neta Johnson | 6 | daughter | — | South Carolina |
| 32 | Franklin Johnson | 3 | son | — | South Carolina |
| 33 | Erwin J. Lowry | 22 | Head | — | South Carolina |
| 34 | Elizabeth Lowry | 51 | wife | — | South Carolina |
| 35 | M. G. Bailey | 46 | Head | Recreational Asst. | South Carolina |
| 36 | Julia Bailey | 44 | wife | — | South Carolina |
| 37 | Julia M. Bailey | 18 | daughter | — | South Carolina |
| 38 | Henry Murray | 30 | Head | Laborer | South Carolina |
| 39 | Louise Murray | 31 | wife | Servant | South Carolina |
| 40 | Carrie Frasier | 33 | Head | Servant | 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)