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Isaac Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Darlington-County, South Carolina
Our Model Tree links this Isaac Johnson across the 1920, 1930 and 1940 US Censuses in Darlington-County, South Carolina (XGBoost, ~Confirmed), with identified parents Arthur & Mac — first a son (b.~1920), then head of a 5-person household.
Age 20
b. ~1920
Male
Son
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Darlington-County, South Carolina |
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Darlington School District Number 2 |
| 1935 Residence (County) | Darlington |
| Additional Details | |
| Occupation | Farm Laborer |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 100 |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Farm Laborer |
| Township / Ward | Darlington School District Number 2 |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Maggie Johnson | Daughter | — | 18 | ~1922 |
| Arthur Johnson | Head | — | 54 | ~1886 |
| Ray Johnson | Son | — | 15 | ~1925 |
| Isaac Johnson | Son | — | 20 | ~1920 |
| Sarah Johnson | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Florence, South …
Son, age 1
Florence, South Carolina · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1930
Florence, South …
Son, age 11
Florence, South Carolina · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | South Carolina |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
Darlington-County, South …
Son, age 20
Darlington-County, South Carolina · implied b. ~1920 — 5 household members
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Darlington School District Number 2 |
| 1935 Residence (County) | Darlington |
| Occupation | Farm Laborer |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 100 |
| Highest Grade | 6 |
| 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 Arthur Johnson (~0.92 confidence) and father Mac Johnson (~0.92 confidence) and mother Sarah Johnson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Arthur Johnson
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Mac Johnson
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Sarah Johnson
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Isaac Johnson
Son · 1940 · age 20 · b. ~1920 · South Carolina
★ You are viewing this record
Sibling
Ray Johnson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maggie Johnson
Sibling · 1940 · age 18
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 — Darlington-County, South Carolina
Open full size
1940 US Federal Census — Darlington-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03802-00264)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Armanda Johnson | 45 | Head | Farmer | South Carolina |
| 42 | Ralf Johnson | 22 | Son | Farm Laborer | South Carolina |
| 43 | Dewitt Johnson | 23 | Head | Farmer | South Carolina |
| 44 | Sarah Johnson | 27 | Wife | — | South Carolina |
| 45 | Willie Johnson | 4 | Son | — | South Carolina |
| 46 | Falsom Johnson | 2 | Daughter | — | South Carolina |
| 47 | Hubert Johnson | 29 | Brother | Farmer | South Carolina |
| 48 | Dottie Johnson | 22 | Sister in law | — | South Carolina |
| 49 | Arthur Johnson | 54 | Head | Farmer | South Carolina |
| 50 | Sarah Johnson | 49 | Wife | — | South Carolina |
| 51 | Isaac Johnson THIS PERSON | 20 | Son | Farm Laborer | South Carolina |
| 52 | Maggie Johnson | 18 | Daughter | — | South Carolina |
| 53 | Ray Johnson | 15 | Son | — | South Carolina |
| 54 | Burton Mack | 49 | Head | Farmer | South Carolina |
| 55 | Eula Mack | 48 | Wife | — | South Carolina |
| 56 | Ethel Mack | 29 | Daughter | Cook | South Carolina |
| 57 | Laurie Mack | 24 | Son | Laborer | South Carolina |
| 58 | Eula M Mack | 20 | Daughter | — | South Carolina |
| 59 | Jannie B Mack | 18 | Daughter | — | South Carolina |
| 60 | Eugene Mack | 15 | Son | — | South Carolina |
| 61 | Willie L Mack | 13 | Daughter | — | South Carolina |
| 62 | Edwards Gordon | 26 | Grandson | Farm Laborer | South Carolina |
| 63 | Cecil Mack | 26 | Head | Farmer | South Carolina |
| 64 | Carrie Mack | 26 | Wife | — | South Carolina |
| 65 | James Mack | 4 | Son | — | South Carolina |
| 66 | Fred Dargon | 46 | Head | Farmer | South Carolina |
| 67 | Flossie Dargon | 40 | Wife | — | South Carolina |
| 68 | Bessie Dargon | 19 | Daughter | Laundress | South Carolina |
| 69 | James Dargon | 18 | Son | Laborer | South Carolina |
| 70 | Hester Dargon | 17 | Daughter | — | South Carolina |
| 71 | Tabitha Dargon | 15 | Daughter | — | South Carolina |
| 72 | Willie M Dargon | 13 | Daughter | — | South Carolina |
| 73 | Benzenia Dargon | 9 | Daughter | — | South Carolina |
| 74 | William Brockington | 43 | Head | Farmer | South Carolina |
| 75 | Kate Brockington | 40 | Wife | — | South Carolina |
| 76 | Gloria J Brockington | 10 | Daughter | — | New York |
| 77 | George M Hutchinson | 32 | Head | Millrite | South Carolina |
| 78 | Addyan Hutchinson | 24 | Wife | — | South Carolina |
| 79 | Frank Hamill | 29 | Head | Laborer | South Carolina |
| 80 | Eva Hamill | 25 | Wife | — | South Carolina |
Pedigree Summary
Isaac + 2 siblings
Gen 1 · 3 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)