KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Richland-County, South Carolina
Our Model Tree links this Katherine Johnson across the 1930 and 1940 US Censuses in Richland-County, South Carolina (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 11-person household.
Age 14
b. ~1926
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Richland-County, South Carolina |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Township / Ward | Arthur |
| 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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Katherine | Age | Birth yr |
|---|---|---|---|---|
| Lucy Johnson | Daughter | — | 11 | ~1929 |
| Helen Johnson | Daughter | — | 4 | ~1936 |
| Sam Johnson | Head | — | 58 | ~1882 |
| Nelson Johnson | Son | — | 17 | ~1923 |
| John Johnson | Son | — | 8 | ~1932 |
| Ethel Johnson | Spouse | — | 34 | ~1906 |
| Ealine Johnson | Daughter | — | 6 | ~1934 |
| Katherine Johnson | Daughter | — | 14 | ~1926 |
| Lethone Johnson | Son | — | 2 | ~1938 |
| Carrie Johnson | Daughter | — | 1 | ~1939 |
| Samuel Johnson | Son | — | 13 | ~1927 |
Census Appearances
1930
Richland, South …
Other, age 5
Richland, South Carolina · implied b. ~1925 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Grand daughter |
| Sex | F |
| Color / Race | Black |
| Age | 5 |
| 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
Richland-County, South …
Daughter, age 14
Richland-County, South Carolina · implied b. ~1926 — 11 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 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 Katherine Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Katherine Johnson
Daughter · 1940 · age 14 · b. ~1926 · South Carolina
★ You are viewing this record
Sibling
Lethone Johnson
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Johnson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carrie Johnson
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Samuel Johnson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nelson Johnson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucy Johnson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Johnson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ealine Johnson
Sibling · 1940 · age 6
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 — Richland-County, South Carolina
Open full size
1940 US Federal Census — Richland-County, South Carolina
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03834-00515)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bessie Brown | 3 | Grand daughter | — | South Carolina |
| 2 | James Tucker | 45 | Head | Laborer | South Carolina |
| 3 | Lizzie Tucker | 40 | Wife | Laundress | South Carolina |
| 4 | Dorothy Tucker | 15 | Daughter | — | South Carolina |
| 5 | Lizzie Blake | 60 | Aunt | — | South Carolina |
| 6 | Carrie Belle Parker | 1 | Grand daughter | — | South Carolina |
| 7 | Sam Johnson | 58 | Head | Laborer | South Carolina |
| 8 | Ethel Johnson | 34 | Wife | — | South Carolina |
| 9 | Nelson Johnson | 17 | Son | Laborer | South Carolina |
| 10 | Katherine Johnson THIS PERSON | 14 | Daughter | — | South Carolina |
| 11 | Samuel Johnson | 13 | Son | — | South Carolina |
| 12 | Lucy Johnson | 11 | Daughter | — | South Carolina |
| 13 | John W Johnson | 8 | Son | — | South Carolina |
| 14 | Ealine Johnson | 6 | Daughter | — | South Carolina |
| 15 | Helen Johnson | 4 | Daughter | — | South Carolina |
| 16 | Lethone Johnson | 2 | Son | — | South Carolina |
| 17 | Carrie Mae Johnson | 1 | Daughter | — | South Carolina |
| 18 | Sanks Bann | 71 | Head | Odd Jobs | South Carolina |
| 19 | Sugar Bann | 68 | Wife | — | South Carolina |
| 20 | Miller Caulwell | 32 | Lodger | Laborer | South Carolina |
| 21 | Lucile Caulwell | 25 | Daughter | Laundress | South Carolina |
| 22 | Ella Mae Caulwell | 8 | Daughter | — | South Carolina |
| 23 | Sarah Caulwell | 6 | Daughter | — | South Carolina |
| 24 | Elliott Caulwell | 1 | Friend | — | South Carolina |
| 25 | Bettie Brown | 14 | Adopted daughter | — | South Carolina |
| 26 | Robert Brown | 11 | Son | — | South Carolina |
| 27 | Susie Taylor | 51 | Head | Laundress | South Carolina |
| 28 | Julia Mae Taylor | 4 | Grand daughter | — | South Carolina |
| 29 | Pelgram Flowers | 65 | Head | Laborer | South Carolina |
| 30 | Ida Flowers | 56 | Wife | — | South Carolina |
| 31 | Martha Flowers | 26 | Daughter | Maid | South Carolina |
| 32 | Chandler Flowers | 20 | Son | — | South Carolina |
| 33 | Lethone Flowers | 17 | Son | Laborer | South Carolina |
| 34 | Lucinda Davis | 75 | Head | — | South Carolina |
| 35 | William Childs | 75 | Head | — | South Carolina |
| 36 | Cynthia Aiken | 19 | Grand daughter | Laundress | South Carolina |
| 37 | Margaret Aiken | 18 | Grand daughter | Child-Nurse | South Carolina |
| 38 | Hadley Aiken | 13 | Grand son | — | South Carolina |
| 39 | Frank Barber | 22 | Head | Laborer | South Carolina |
| 40 | Helen Barber | 17 | Wife | — | South Carolina |
Related Census Records
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)