KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lawrence-County, Pennsylvania
Our Model Tree links this Katherine Johnson across the 1930 and 1940 US Censuses in Lawrence-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lawrence-County, Pennsylvania |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | New Castle city |
| 1935 Residence (County) | Lawrence |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | New Castle City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Katherine | Age | Birth yr |
|---|---|---|---|---|
| Isabelle Johnson | Daughter | — | 24 | ~1916 |
| Clara Emery | Other | — | 58 | ~1882 |
| Sara Johnson | Daughter | — | 18 | ~1922 |
| Robert Johnson | Son | — | 22 | ~1918 |
| Mont Johnson | Head | — | 51 | ~1889 |
| Effie Emery | Other | — | 54 | ~1886 |
| Margaret Johnson | Spouse | — | 50 | ~1890 |
| Katherine Johnson | Daughter | — | 15 | ~1925 |
| Benjamin Johnson | Son | — | 23 | ~1917 |
Census Appearances
1930
Lawrence, Pennsylvania
Daughter, age 4
Lawrence, Pennsylvania · implied b. ~1926 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Katherine A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lawrence-County, Pennsylvania
Daughter, age 15
Lawrence-County, Pennsylvania · implied b. ~1925 — 9 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | New Castle city |
| 1935 Residence (County) | Lawrence |
| Class of Worker | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 15 · b. ~1925 · Pennsylvania
★ You are viewing this record
Sibling
Benjamin Johnson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Isabelle Johnson
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sara 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 — Lawrence-County, Pennsylvania
Open full size
1940 US Federal Census — Lawrence-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03537-00285)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Bartock | 9 | son | — | Pennsylvania |
| 2 | Wylie Lydick | 53 | head | Traveling Salesman | Pennsylvania |
| 3 | Edna Lydick | 51 | wife | Saleslady | West Virginia |
| 4 | Mont A. Johnson | 51 | head | Salesman | Pennsylvania |
| 5 | Margaret E. Johnson | 50 | wife | — | Pennsylvania |
| 6 | Isabelle Johnson | 24 | daughter | Choir Director | Pennsylvania |
| 7 | Benjamin F. Johnson | 23 | son | Accountant | Pennsylvania |
| 8 | Robert S. Johnson | 22 | son | Salesclerk | Pennsylvania |
| 9 | Sara E. Johnson | 18 | daughter | New Worker | Pennsylvania |
| 10 | Katherine Johnson THIS PERSON | 15 | daughter | — | Pennsylvania |
| 11 | Clara M. Emery | 58 | sister-in-law | Proprietor | Pennsylvania |
| 12 | Effie L. Emery | 54 | sister-in-law | Salesclerk | Ohio |
| 13 | George E. Zerner | 60 | head | — | Pennsylvania |
| 14 | Elizabeth Zerner | 60 | wife | — | Pennsylvania |
| 15 | John F. Otto | 52 | head | Engineer | Pennsylvania |
| 16 | May E. Otto | 36 | wife | — | Ohio |
| 17 | John F. Otto | 2 | son | — | Pennsylvania |
| 18 | David B. Otto | 1 | son | — | Pennsylvania |
| 19 | Clara E. Fry | 66 | head | — | Pennsylvania |
| 20 | Ella Dague | 61 | sister | — | Pennsylvania |
| 21 | Alan Chamberlain | 23 | head | Electrician | Pennsylvania |
| 22 | Belle Chamberlain | 22 | wife | — | Pennsylvania |
| 23 | Joseph Green | 38 | head | Manager-Agent | Pennsylvania |
| 24 | Anna M. Green | 34 | wife | — | Pennsylvania |
| 25 | Anne Green | 11 | daughter | — | Pennsylvania |
| 26 | Carolyn Green | 8 | daughter | — | Pennsylvania |
| 27 | Howard W. Lightner | 46 | head | Salesman | Pennsylvania |
| 28 | Ethel Lightner | 36 | wife | — | Pennsylvania |
| 29 | Virginia R. Lightner | 8 | daughter | — | Pennsylvania |
| 30 | Gregory Christos | 46 | head | Waiter | Greece |
| 31 | Bessie Christos | 39 | wife | — | Greece |
| 32 | Ethel Christos | 17 | daughter | — | Pennsylvania |
| 33 | Stella Christos | 16 | daughter | Typist | Pennsylvania |
| 34 | Eva Christos | 15 | daughter | Housemaid | Pennsylvania |
| 35 | Christina Christos | 14 | daughter | — | Pennsylvania |
| 36 | Mary Christos | 12 | daughter | — | Pennsylvania |
| 37 | Pauline Christos | 7 | daughter | — | Pennsylvania |
| 38 | Helen Christos | 7 | daughter | — | Pennsylvania |
| 39 | Robert S. Houk | 60 | head | Inspector | Pennsylvania |
| 40 | Lottie Houk | 57 | wife | — | Pennsylvania |
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)