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Mary Mack — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sumter-County, South Carolina
Our Model Tree links this Mary Mack across the 1920, 1930 and 1940 US Censuses in Sumter-County, South Carolina (XGBoost, ~Confirmed), with identified parents Harvey & Ella — first a daughter (b.~1918), then head of a 8-person household.
Age 22
b. ~1918
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sumter-County, South Carolina |
| Surname | Mack |
| Given Name | Mary A |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Sumter City |
| 1935 Residence (County) | Sumter |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same Place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Township / Ward | Sumter City |
| Est. Birth Year | ~1918 |
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 |
|---|---|---|---|---|
| Allie Mack | Son | — | 18 | ~1922 |
| Viola Mack | Daughter | — | 20 | ~1920 |
| Cleland Mack | Son | — | 13 | ~1927 |
| Allie Mack | Head | — | 52 | ~1888 |
| Mary Mack | Daughter | — | 22 | ~1918 |
| Adam Mack | Son | — | 15 | ~1925 |
| Candis Mack | Spouse | — | 39 | ~1901 |
| Robert Mack | Son | — | 17 | ~1923 |
Census Appearances
1920
Lee, South …
Daughter, age 3
Lee, South Carolina · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mack |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 3 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | none |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1930
Lee, South …
Daughter, age 11
Lee, South Carolina · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mack |
| Given Name | Mary S |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Sumter-County, South …
Daughter, age 22
Sumter-County, South Carolina · implied b. ~1918 — 8 household members
| Surname | Mack |
| Given Name | Mary A |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Sumter City |
| 1935 Residence (County) | Sumter |
| Highest Grade | No 4 |
| 1935 Residence | Same Place |
| 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 Mack across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harvey Mack (~0.92 confidence) and mother Ella Mack (~0.92 confidence) and father Allie Mack (~0.92 confidence) and mother Annie Mack (~0.92 confidence) and father Mack Mack (~0.92 confidence) and mother Candis Mack (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harvey Mack
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Ella Mack
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
Allie Mack
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Annie Mack
b. ~1890
Source mother
● Household
· direct · ~0.92
Father
Mack Mack
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Candis Mack
b. ~1901
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Mack
Daughter · 1940 · age 22 · b. ~1918 · South Carolina
★ You are viewing this record
Sibling
Robert Mack
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Allie Mack
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Viola Mack
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adam Mack
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cleland Mack
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 — 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-t0627-03842-00315)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ophelia Harm | 3 | daughter | — | South Carolina |
| 2 | Delores Harm | 1 | daughter | — | South Carolina |
| 3 | Eliza Mcmickle | 67 | Mother-in-law | — | South Carolina |
| 4 | Nattie Debose | 44 | Head | Practical Nurse | South Carolina |
| 5 | Florine Bridges | 15 | daughter | — | South Carolina |
| 6 | Martha Mcbrile | 30 | Head | Servant | South Carolina |
| 7 | Isaiah Mcbrile | 28 | brother | Laborer | South Carolina |
| 8 | Paul Glover | 29 | Head | Laborer | South Carolina |
| 9 | Edna Glover | 25 | wife | Servant | Florida |
| 10 | Willie Gaymon | 38 | Head | Laborer | South Carolina |
| 11 | Hattie Gaymon | 34 | wife | Sew | South Carolina |
| 12 | Jim Glover | 40 | Head | Laborer | South Carolina |
| 13 | Maggie Glover | 39 | wife | Teacher | South Carolina |
| 14 | Romes Williams | 23 | Head | Laborer | South Carolina |
| 15 | Rosa Williams | 21 | wife | — | South Carolina |
| 16 | Ethel Mae Williams | 4 | daughter | — | South Carolina |
| 17 | Erma Williams | 3 | daughter | — | South Carolina |
| 18 | Semmie Williams | 2 | son | — | South Carolina |
| 19 | Estell Snell | 39 | Head | Laundress | South Carolina |
| 20 | John Snell | 19 | son | Laborer | South Carolina |
| 21 | Ella Snell | 3 | daughter | — | South Carolina |
| 22 | Irene Whack | 27 | Head | — | South Carolina |
| 23 | Ella Whack | 16 | daughter | — | South Carolina |
| 24 | Mary Burroughs | 69 | Head | — | South Carolina |
| 25 | George Pierson | 32 | Head | Laborer | South Carolina |
| 26 | Dora Pierson | 45 | mother | — | South Carolina |
| 27 | Willie Pierson | 29 | brother | Laborer | South Carolina |
| 28 | Mary Pierson | 8 | sister | — | South Carolina |
| 29 | Allie Mack | 52 | Head | Yard Cleaner | South Carolina |
| 30 | Candis Mack | 39 | wife | — | South Carolina |
| 31 | Mary A Mack THIS PERSON | 22 | daughter | — | South Carolina |
| 32 | Viola Mack | 20 | daughter | — | South Carolina |
| 33 | Allie Jr Mack | 18 | son | Laborer | South Carolina |
| 34 | Robert Mack | 17 | son | — | South Carolina |
| 35 | Adam Mack | 15 | son | — | South Carolina |
| 36 | Cleland Mack | 13 | son | — | South Carolina |
| 37 | Sarah Mack | 10 | Head | — | South Carolina |
| 38 | Stephen Mack | 7 | son | — | South Carolina |
| 39 | Laborne Conyers | 60 | Head | Carpenter | South Carolina |
| 40 | Mamie Conyers | 58 | wife | — | South Carolina |
Pedigree Summary
Mary + 5 siblings
Gen 1 · 6 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)