KJ
Katherine Johnson — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this Katherine Johnson across the 1920 and 1930 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 8-person household.
Age 12
b. ~1918
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ohio |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh 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 1930 census.
| Name | Relation to head | Relative to Katherine | Age | Birth yr |
|---|---|---|---|---|
| Idabelle Johnson | Daughter | — | 9 | ~1921 |
| Katherine Johnson | Daughter | — | 12 | ~1918 |
| Russell Johnson | Son | — | 24 | ~1906 |
| Kenneth Johnson | Son | — | 16 | ~1914 |
| Nathaniel Johnson | Son | — | 18 | ~1912 |
| Keith Johnson | Son | — | 16 | ~1914 |
| Oscar Johnson | Head | — | 48 | ~1882 |
| Edna Johnson | Spouse | — | 47 | ~1883 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 1
Allegheny, Pennsylvania · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Kathryn |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ohio |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 12
Allegheny, Pennsylvania · implied b. ~1918 — 8 household members
| Surname | Johnson |
| Given Name | Katherine |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| 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 (1920 and 1930) in Allegheny, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Katherine Johnson
Daughter · 1930 · age 12 · b. ~1918 · Pennsylvania
★ You are viewing this record
Sibling
Kenneth Johnson
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nathaniel Johnson
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russell Johnson
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Idabelle Johnson
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Keith Johnson
Sibling · 1930 · age 16
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
1930 US Federal Census — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel1983:1097)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Oscar E. Johnson | 48 | Head | Draftsman | Pennsylvania |
| 2 | Edna M. Johnson | 47 | Wife | — | Ohio |
| 3 | Russell O. Johnson | 24 | Son | Adjuster | Pennsylvania |
| 4 | Nathaniel M. Johnson | 18 | Son | — | Pennsylvania |
| 5 | Kenneth Johnson | 16 | Son | — | Pennsylvania |
| 6 | Keith Johnson | 16 | Son | — | Pennsylvania |
| 7 | Katherine Johnson THIS PERSON | 12 | Daughter | — | Pennsylvania |
| 8 | Idabelle Johnson | 9 | Daughter | — | Pennsylvania |
| 9 | Jacob Krieling | 62 | Head | Mechanic | Germany |
| 10 | Mary E. Krieling | 61 | Wife | — | Germany |
| 11 | Walter J. Krieling | 31 | Son | Agent | Pennsylvania |
| 12 | Mattie J. Greiner | 75 | Head | — | Pennsylvania |
| 13 | Edward F. Greiner | 43 | Son | Sales | Pennsylvania |
| 14 | John S. Greiner | 25 | Son | Bookkeeper | Pennsylvania |
| 15 | Dorothy E. Greiner | 17 | Gr-daughter | Sales Lady | Pennsylvania |
| 16 | George H. Walker | 49 | Head | Salesman | Pennsylvania |
| 17 | Matilda Walker | 43 | Wife | — | Pennsylvania |
| 18 | Wilson H. Walker | 13 | Son | Salesman | Pennsylvania |
| 19 | James L. Allis | 71 | Boarder | Truck Loader | West Virginia |
| 20 | Albert A. Hildebrand | 57 | Head | Finisher | Germany |
| 21 | Matilda E. Hildebrand | 48 | Wife | — | Pennsylvania |
| 22 | Maurice A. Spindler | 24 | Son-in-law | Accountant | Pennsylvania |
| 23 | Elvera M. Spindler | 23 | Daughter | — | Pennsylvania |
| 24 | August Kopp | 57 | Head | Baker | Germany |
| 25 | Catherine Kopp | 47 | Wife | — | Germany |
| 26 | Margaret Kopp | 17 | Daughter | Stenographer | Pennsylvania |
| 27 | Benjamin H. Major | 53 | Head | Tank Builder | England |
| 28 | Catherine Major | 54 | Wife | — | Pennsylvania |
| 29 | Charles B. Major | 22 | Son | Physician | Pennsylvania |
| 30 | Martha E. Major | 19 | Daughter | Stenographer | Pennsylvania |
| 31 | Marian G. Major | 17 | Daughter | Binding Girl | Pennsylvania |
| 32 | George R. Major | 13 | Son | — | Pennsylvania |
| 33 | Benjamin R. Major | 80 | Father | — | England |
| 34 | Van A. Harley | 37 | Head | Salesman | Pennsylvania |
| 35 | Helen W. Harley | 31 | Wife | — | Pennsylvania |
| 36 | Blair D. Harley | 11 | Son | — | Pennsylvania |
| 37 | Dale F. Harley | 10 | Son | — | Pennsylvania |
| 38 | Elizabeth Harley | 58 | Mother | — | Pennsylvania |
| 39 | William Mason | 40 | Head | Agent | Pennsylvania |
| 40 | Lilly M. Mason | 38 | Wife | — | Wales |
| 41 | Ray F. Mason | 15 | Son | — | Pennsylvania |
| 42 | Ruth E. Mason | 14 | Daughter | — | Pennsylvania |
| 43 | Jack A. Mason | 8 | Son | — | Pennsylvania |
| 44 | Jane R. Mason | 3 | Daughter | — | Pennsylvania |
| 45 | James J. Maulis | 29 | Head | Stenographer | Pennsylvania |
| 46 | Jane Maulis | 29 | Wife | — | Pennsylvania |
| 47 | Donald J. Maulis | 3 | Son | — | Pennsylvania |
| 48 | Ada Gibson | 65 | Housekeeper | Housekeeper | Pennsylvania |
| 49 | Thomas A. Blackstock | 47 | Head | Carpenter | Pennsylvania |
| 50 | Bessie Blackstock | 40 | Wife | — | Wales |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)