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Mary Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Oconee-County, South Carolina
Our Model Tree links this Mary Brock across the 1930 and 1940 US Censuses in Oconee-County, South Carolina (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 8-person household.
Age 14
b. ~1926
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Oconee-County, South Carolina |
| Surname | Brock |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Oconee |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | South Carolina |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Township / Ward | Center Township |
| Est. Birth Year | ~1926 |
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 |
|---|---|---|---|---|
| C Brock | Other | — | 11 | ~1929 |
| D Lay | Son | — | 14 | ~1926 |
| Charles Lay | Head | — | 56 | ~1884 |
| Mary Lay | Spouse | — | 49 | ~1891 |
| James Lay | Son | — | 21 | ~1919 |
| Mary Brock | Daughter | — | 14 | ~1926 |
| Cleve Lay | Daughter | — | 17 | ~1923 |
| Peggy Lay | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Oconee, South …
Other, age 4
Oconee, South Carolina · implied b. ~1926 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | Mary E. |
| Relationship to Head | Grand daughter |
| Sex | F |
| Color / Race | White |
| 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
Oconee-County, South …
Daughter, age 14
Oconee-County, South Carolina · implied b. ~1926 — 8 household members
| Surname | Brock |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Oconee |
| Class of Worker | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | South Carolina |
| 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 14 · b. ~1926 · South Carolina
★ You are viewing this record
Sibling
D Lay
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleve Lay
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Lay
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peggy Lay
Sibling · 1940 · age 12
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 — Oconee-County, South Carolina
Open full size
1940 US Federal Census — Oconee-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03828-00025)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Benjamin Mcgee | 27 | Boarder | Farmer | South Carolina |
| 2 | Charles F. Lay | 56 | Head | Blacksmith | South Carolina |
| 3 | Mary H. Lay | 49 | Wife | Farmer | South Carolina |
| 4 | James J. Lay | 21 | Son | Farmer | South Carolina |
| 5 | Cleve Lay | 17 | Daughter | Farmer | South Carolina |
| 6 | D. Truman Lay | 14 | Son | Farmer | South Carolina |
| 7 | Peggy M. Lay | 12 | Daughter | — | South Carolina |
| 8 | Mary A. Brock THIS PERSON | 14 | Daughter | — | South Carolina |
| 9 | C. F. Brock | 11 | Boarder | — | South Carolina |
| 10 | Patrick H. Gambrell | 57 | Head | Farmer | South Carolina |
| 11 | Lilly M. Gambrell | 45 | Wife | — | South Carolina |
| 12 | Dan H. Gambrell | 21 | Son | Farmer | South Carolina |
| 13 | William B. Gambrell | 18 | Son | Laborer | South Carolina |
| 14 | Carlton L. Gambrell | 16 | Son | Laborer | South Carolina |
| 15 | Regina B. Gambrell | 15 | Daughter | — | South Carolina |
| 16 | Alta C. Gambrell | 12 | Daughter | — | South Carolina |
| 17 | Purnie Gleaton | 44 | Head | Farmer | South Carolina |
| 18 | Lilly E. Gleaton | 24 | Wife | — | South Carolina |
| 19 | Purnie Jr. Gleaton | 4 | Son | — | South Carolina |
| 20 | Roosevelt Gleaton | 3 | Son | — | South Carolina |
| 21 | J. Berry Gleaton | 2 | Son | — | South Carolina |
| 22 | Robert N. Gleaton | 0 | Son | — | South Carolina |
| 23 | John A. Eubanks | 77 | Head | — | South Carolina |
| 24 | Amanda T. Eubanks | 73 | Wife | — | South Carolina |
| 25 | Bertha E. Eubanks | 55 | Daughter | — | South Carolina |
| 26 | Fred F. Jordan | 50 | Head | Farmer | Georgia |
| 27 | Willie D. Jordan | 84 | Father | — | Georgia |
| 28 | L. Fannie Jordan | 76 | Mother | — | Georgia |
| 29 | Samuel W. Kidd | 17 | Nephew | Farmer | Georgia |
| 30 | Grover J. Black | 49 | Head | Farmer | South Carolina |
| 31 | Essie E. Black | 48 | Wife | — | South Carolina |
| 32 | L. Q. Black | 25 | Son | Farmer | South Carolina |
| 33 | Clyde J. Black | 19 | Son | Farmer | South Carolina |
| 34 | Mildred E. Black | 14 | Daughter | — | South Carolina |
| 35 | Emma E. Black | 9 | Daughter | — | South Carolina |
| 36 | Daniel W. Ray | 19 | Head | Laborer | South Carolina |
| 37 | Nettie K. Ray | 19 | Wife | — | Georgia |
| 38 | Bart C. Certain | 59 | Head | Farmer | Georgia |
| 39 | Rinee J. Certain | 50 | Wife | — | South Carolina |
| 40 | Cecil C. Certain | 29 | Daughter | Wpa | 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)