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Isaac Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Calhoun-County, South Carolina
Our Model Tree links this Isaac Johnson across the 1920, 1930 and 1940 US Censuses in Calhoun-County, South Carolina (XGBoost, ~Confirmed), with identified parents Calvin — first a head (b.~1908), then head of a 5-person household.
Age 32
b. ~1908
Male
Head
Born: South Carolina
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Calhoun-County, South Carolina |
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 32 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | Lyons Twp |
| 1935 Residence (County) | Calhoun |
| Additional Details | |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 156 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Farm Laborer |
| Township / Ward | Lyons Twp |
| Est. Birth Year | ~1908 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Isaac | Age | Birth yr |
|---|---|---|---|---|
| Carrie Johnson | Daughter | — | 3 | ~1937 |
| Anna Johnson | Daughter | — | 1 | ~1939 |
| Thomas Johnson | Daughter | — | 6 | ~1934 |
| Isaac Johnson | Head | — | 32 | ~1908 |
| Bertha Johnson | Spouse | — | 27 | ~1913 |
Census Appearances
1920
Orangeburg, South …
Son, age 12
Orangeburg, South Carolina · implied b. ~1908 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Mulatto |
| Age | 12 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Farm laborer |
| Industry | Home farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1930
Orangeburg, South …
Head, age 21
Orangeburg, South Carolina · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 21 |
| Marital Status | Married |
| Birthplace | South Carolina |
| Age at First Marriage | 20 |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | Farmer |
| Industry | General farming |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Calhoun-County, South …
Head, age 32
Calhoun-County, South Carolina · implied b. ~1908 — 5 household members
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 32 |
| Marital Status | Married |
| Birthplace | South Carolina |
| 1935 Residence (City) | Lyons Twp |
| 1935 Residence (County) | Calhoun |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 156 |
| Highest Grade | No 5 |
| 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 Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Calvin Johnson (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Calvin Johnson
b. ~1885
Source father
● Household
· direct · ~0.92
This person
Anchor record
Isaac Johnson
Head · 1940 · age 32 · b. ~1908 · South Carolina
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Calhoun-County, South Carolina
Open full size
1940 US Federal Census — Calhoun-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03792-00380)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charlie Aiken | 2 | Son | — | South Carolina |
| 42 | Ethel Mae Aiken | 10 | Daughter | — | South Carolina |
| 43 | Frances Aiken | 7 | Daughter | — | South Carolina |
| 44 | Sara Jane Aiken | 5 | Daughter | — | South Carolina |
| 45 | Bennie Lee Aiken | 2 | Son | — | South Carolina |
| 46 | Ruby Mae Aiken | 1 | Daughter | — | South Carolina |
| 47 | Marion Fowler | 33 | Head | Farmer | South Carolina |
| 48 | Nellie Mae Fowler | 28 | Wife | — | South Carolina |
| 49 | Willie Mae Fowler | 5 | Daughter | — | South Carolina |
| 50 | James L Fowler | 1 | Son | — | South Carolina |
| 51 | Henry Johnson | 33 | Head | Farm Laborer | South Carolina |
| 52 | Eliza Johnson | 22 | Wife | — | South Carolina |
| 53 | Henry Jr Johnson | 4 | Son | — | South Carolina |
| 54 | Mary Jr Johnson | 3 | Son | — | South Carolina |
| 55 | Freddie W Johnson | 1 | Son | — | South Carolina |
| 56 | Isaac Johnson THIS PERSON | 32 | Head | Farm Laborer | South Carolina |
| 57 | Bertha Johnson | 27 | Wife | — | South Carolina |
| 58 | Thomas E Johnson | 6 | Daughter | — | South Carolina |
| 59 | Carrie Lee Johnson | 3 | Daughter | — | South Carolina |
| 60 | Anna Johnson | 1 | Daughter | — | South Carolina |
| 61 | Whitfield Johnson | 46 | Head | Manager | South Carolina |
| 62 | Aida Johnson | 43 | Wife | — | South Carolina |
| 63 | Andrew Johnson | 20 | Son | Laborer | South Carolina |
| 64 | Maggie Mae Johnson | 15 | Daughter | Laborer | South Carolina |
| 65 | Charlie Johnson | 14 | Son | — | South Carolina |
| 66 | Texas Johnson | 12 | Daughter | — | South Carolina |
| 67 | Solomon Johnson | 10 | Son | — | South Carolina |
| 68 | Cornelia Johnson | 8 | Daughter | — | South Carolina |
| 69 | Etha Mae Johnson | 7 | Daughter | — | South Carolina |
| 70 | Russell Johnson | 58 | Head | Farmer | South Carolina |
| 71 | Willie Thompson | 27 | Son | Teacher | South Carolina |
| 72 | Anna Thompson | 26 | Daughter in law | — | South Carolina |
| 73 | Ella Wells | 15 | Grand daughter | — | South Carolina |
| 74 | Elizabeth Wells | 14 | Grand daughter | — | South Carolina |
| 75 | Quenna Wells | 13 | Grand daughter | — | South Carolina |
| 76 | Nathan Johnson | 4 | Son | — | South Carolina |
| 77 | Clenton Bartlett | 47 | Head | Farm Laborer | South Carolina |
| 78 | Daniel Thompson | 30 | Head | Farmer | South Carolina |
| 79 | May Bell Thompson | 23 | Wife | — | South Carolina |
| 80 | Juanita Thompson | 7 | Daughter | — | South Carolina |
Pedigree Summary
Isaac
Gen 1 · 1 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)