KJ
Katherine Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Luzerne-County, Pennsylvania
Our Model Tree links this Katherine Johnson across the 1930 and 1940 US Censuses in Luzerne-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 8-person household.
Age 22
b. ~1918
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Luzerne-County, Pennsylvania |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Wilkes Barre City |
| 1935 Residence (County) | Luzerne |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Wilkes Barre City |
| Est. Birth Year | ~1918 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Katherine | Age | Birth yr |
|---|---|---|---|---|
| James Johnson | Son | — | 10 | ~1930 |
| Katherine Johnson | Daughter | — | 22 | ~1918 |
| John Johnson | Head | — | 59 | ~1881 |
| Louis Johnson | Son | — | 27 | ~1913 |
| Anna Johnson | Spouse | — | 52 | ~1888 |
| Theodore Johnson | Son | — | 29 | ~1911 |
| Lawrence Johnson | Son | — | 27 | ~1913 |
| Mary Johnson | Daughter | — | 25 | ~1915 |
Census Appearances
1930
Luzerne, Pennsylvania
Daughter, age 11
Luzerne, Pennsylvania · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Kathryn M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Luzerne-County, Pennsylvania
Daughter, age 22
Luzerne-County, Pennsylvania · implied b. ~1918 — 8 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Wilkes Barre City |
| 1935 Residence (County) | Luzerne |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 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 22 · b. ~1918 · Pennsylvania
★ You are viewing this record
Sibling
Theodore Johnson
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Johnson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Johnson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Johnson
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louis Johnson
Sibling · 1940 · age 27
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 — Luzerne-County, Pennsylvania
Open full size
1940 US Federal Census — Luzerne-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03562-00189)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rose Campbell | 23 | Wife | — | Pennsylvania |
| 2 | Stanley Kadluboski | 44 | Head | Coal Miner | Poland |
| 3 | Julia Kadluboski | 39 | Wife | — | Pennsylvania |
| 4 | Anna Brogan | 57 | Head | — | Ireland |
| 5 | Aloysius Galligan | 33 | Head | Manager | Pennsylvania |
| 6 | Mary Galligan | 30 | Wife | — | Pennsylvania |
| 7 | William A Brogan | 37 | Head | Butcher | Pennsylvania |
| 8 | Mary E Brogan | 32 | Wife | — | New York |
| 9 | James Brogan | 10 | Son | — | Pennsylvania |
| 10 | Maryann Brogan | 9 | Daughter | — | Pennsylvania |
| 11 | Theresa Brogan | 8 | Daughter | — | Pennsylvania |
| 12 | William Brogan | 5 | Son | — | Pennsylvania |
| 13 | Margaret Brogan | 2 | Daughter | — | Pennsylvania |
| 14 | James Higgins | 30 | Head | Clerk | New York |
| 15 | Nora Higgins | 25 | Wife | — | Pennsylvania |
| 16 | Margaret Higgins | 7 | Daughter | — | Pennsylvania |
| 17 | James Higgins | 4 | Son | — | Pennsylvania |
| 18 | Jeanne Higgins | 1 | Daughter | — | New York |
| 19 | John Johnson | 59 | Head | Carpenter | Pennsylvania |
| 20 | Anna Johnson | 52 | Wife | — | Pennsylvania |
| 21 | Mary Johnson | 25 | Daughter | Office Clerk | Pennsylvania |
| 22 | Katherine Johnson THIS PERSON | 22 | Daughter | — | Pennsylvania |
| 23 | Theodore Johnson | 29 | Son | Floor Man | Pennsylvania |
| 24 | Lawrence Johnson | 27 | Son | — | Pennsylvania |
| 25 | Louis Johnson | 27 | Son | Laborer | Pennsylvania |
| 26 | James Johnson | 10 | Son | — | Pennsylvania |
| 27 | Martin Howley | 58 | Head | Conductor | Pennsylvania |
| 28 | Mary Howley | 49 | Wife | — | Pennsylvania |
| 29 | Betty Howley | 24 | Daughter | Service Clerk | Pennsylvania |
| 30 | Catherine Howley | 19 | Daughter | Nurse | Pennsylvania |
| 31 | Martin Howley | 18 | Son | — | Pennsylvania |
| 32 | Robert Howley | 15 | Son | — | Pennsylvania |
| 33 | Mary Howley | 13 | Daughter | — | Pennsylvania |
| 34 | Frances Howley | 12 | Son | — | Pennsylvania |
| 35 | James Mc Cabe | 45 | Head | Laborer | Pennsylvania |
| 36 | Agnes Mc Cabe | 40 | Wife | — | Pennsylvania |
| 37 | Mary Mc Cabe | 14 | Daughter | — | Pennsylvania |
| 38 | Elaine Mc Cabe | 9 | Daughter | — | Pennsylvania |
| 39 | Thomas Mc Cabe | 5 | Son | — | Pennsylvania |
| 40 | George Harvey | 56 | Head | — | 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)