IT
Isaac Thompson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Charleston-County, South Carolina
Our Model Tree links this Isaac Thompson across the 1930 and 1940 US Censuses in Charleston-County, South Carolina (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 10-person household.
Age 17
b. ~1923
Male
Son
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Charleston-County, South Carolina |
| Surname | Thompson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Charleston |
| 1935 Residence (County) | Charleston |
| Additional Details | |
| Occupation | Delivery Boy |
| Industry | Retail Grocery |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 130 |
| Highest Grade | No 1 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Delivery Boy |
| Township / Ward | Charleston |
| Est. Birth Year | ~1923 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Isaac | Age | Birth yr |
|---|---|---|---|---|
| Clinton Thompson | Son | — | 3 | ~1937 |
| Sam Thompson | Son | — | 11 | ~1929 |
| Annie Thompson | Daughter | — | 20 | ~1920 |
| Lillie Thompson | Daughter | — | 9 | ~1931 |
| George Thompson | Head | — | 50 | ~1890 |
| Shirley Thompson | Daughter | — | 4 | ~1936 |
| Roy Thompson | Son | — | 6 | ~1934 |
| Victoria Thompson | Spouse | — | 32 | ~1908 |
| Isaac Thompson | Son | — | 17 | ~1923 |
| Kate Thompson | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Charleston, South …
Son, age 8
Charleston, South Carolina · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 8 |
| 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
Charleston-County, South …
Son, age 17
Charleston-County, South Carolina · implied b. ~1923 — 10 household members
| Surname | Thompson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 17 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Charleston |
| 1935 Residence (County) | Charleston |
| Occupation | Delivery Boy |
| Industry | Retail Grocery |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 130 |
| Highest Grade | No 1 |
| 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 Isaac Thompson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Isaac Thompson
Son · 1940 · age 17 · b. ~1923 · South Carolina
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Sibling
Shirley Thompson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clinton Thompson
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kate Thompson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sam Thompson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillie Thompson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roy Thompson
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Annie Thompson
Sibling · 1940 · age 20
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 — Charleston-County, South Carolina
Open full size
1940 US Federal Census — Charleston-County, South Carolina
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03794-00203)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William R. Davis | 33 | Head | Cashier | Ohio |
| 42 | Lella M. Davis | 31 | Wife | — | South Carolina |
| 43 | William Jr. Davis | 11 | Son | — | South Carolina |
| 44 | Susan E. Davis | 8 | Daughter | — | South Carolina |
| 45 | Zachariah Hamilton | 67 | Head | — | Georgia |
| 46 | Annie L. Hamilton | 57 | Wife | — | South Carolina |
| 48 | Emmett H. Webster | 36 | Head | Manager | South Carolina |
| 49 | Mildred Webster | 30 | Wife | Sales Lady | South Carolina |
| 50 | Quinton Yonce | 29 | Roomer | Salesman | South Carolina |
| 51 | Williamine Yonce | 25 | Roomer | — | South Carolina |
| 52 | Quinton Jr. Yonce | 2 | Roomer | — | South Carolina |
| 53 | Luther Burgess | 32 | Head | Cook | South Carolina |
| 54 | Gertie Burgess | 14 | Daughter | — | South Carolina |
| 55 | Annie L. Burgess | 12 | Daughter | — | South Carolina |
| 56 | George Thompson | 50 | Head | Carpenter | South Carolina |
| 57 | Victoria Thompson | 32 | Wife | Wash + Irons | South Carolina |
| 58 | Annie B. Thompson | 20 | Daughter | Domestic | South Carolina |
| 59 | Isaac Thompson THIS PERSON | 17 | Son | Delivery Boy | South Carolina |
| 60 | Kate Thompson | 15 | Daughter | — | South Carolina |
| 61 | Sam Thompson | 11 | Son | — | South Carolina |
| 62 | Lillie Thompson | 9 | Daughter | — | South Carolina |
| 63 | Roy Thompson | 6 | Son | — | South Carolina |
| 64 | Shirley Thompson | 4 | Daughter | — | South Carolina |
| 65 | Clinton Thompson | 3 | Son | — | South Carolina |
| 66 | Pauline Fields | 40 | Head | Laundress | South Carolina |
| 67 | Sam Shaw | 46 | Head | Laborer | South Carolina |
| 68 | Virginia Shaw | 41 | Wife | — | South Carolina |
| 69 | Miles Calvary | 41 | Head | Laborer | South Carolina |
| 70 | Elizabeth Calvary | 39 | Wife | — | South Carolina |
| 71 | Virginia Calvary | 12 | Daughter | — | South Carolina |
| 72 | Steele Calvary | 9 | Daughter | — | South Carolina |
| 73 | Coreane Calvary | 7 | Daughter | — | South Carolina |
| 74 | Harold Calvary | 6 | Son | — | South Carolina |
| 75 | Henry Calvary | 5 | Son | — | South Carolina |
| 76 | Cleveland Calvary | 3 | Son | — | South Carolina |
| 77 | Gertrude Calvary | 0 | Daughter | — | South Carolina |
| 78 | Sylvester Mitchell | 38 | Head | Laborer | South Carolina |
| 79 | Lucile Mitchell | 38 | Wife | — | South Carolina |
| 80 | Charlie Prescott | 40 | Head | Laborer | 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)