HJ
Helen Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Helen Johnston across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Lawrence & Catherine — first a daughter (b.~1898), then head of a 4-person household.
Age 42
b. ~1898
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Telephone Operator |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1560 |
| Highest Grade | No 12 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Telephone Operator |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1898 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Helen | Age | Birth yr |
|---|---|---|---|---|
| Lawrence Johnston | Head | — | 63 | ~1877 |
| Helen Johnston | Daughter | — | 42 | ~1898 |
| Catherine Johnston | Spouse | — | 65 | ~1875 |
| Harry Johnston | Son | — | 27 | ~1913 |
Census Appearances
1920
Allegheny, Pennsylvania
Spouse, age 21
Allegheny, Pennsylvania · implied b. ~1899 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Hazel J |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Other, age 32
Allegheny, Pennsylvania · implied b. ~1898 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Hazel |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 21 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 42
Allegheny-County, Pennsylvania · implied b. ~1898 — 4 household members
| Surname | Johnston |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Occupation | Telephone Operator |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1560 |
| Highest Grade | No 12 |
| 1935 Residence | Same House |
| 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 Helen Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Lawrence Johnston (~0.92 confidence) and mother Catherine Johnston (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Lawrence Johnston
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Catherine Johnston
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Helen Johnston
Daughter · 1940 · age 42 · b. ~1898 · Pennsylvania
★ You are viewing this record
Sibling
Harry Johnston
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03665-00558)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lawrence Johnston | 63 | Head | Freight Conductor | Pennsylvania |
| 2 | Catherine Johnston | 65 | Wife | — | Pennsylvania |
| 3 | Harry E. Johnston | 27 | Son | Truck Driver | Pennsylvania |
| 4 | Helen Johnston THIS PERSON | 42 | Daughter | Telephone Operator | Pennsylvania |
| 5 | Thomas Sawyers | 57 | Head | Fireman | England |
| 6 | Caroline Sawyers | 80 | Wife | — | England |
| 7 | Edward Lytle | 73 | Head | — | Pennsylvania |
| 8 | Jenny Lytle | 79 | Wife | — | Pennsylvania |
| 9 | Walter Merce | 59 | Head | Plumber Helper | South Carolina |
| 10 | Gertrude Merce | 52 | Wife | — | Pennsylvania |
| 11 | Perry Merce | 10 | Son | — | Pennsylvania |
| 12 | Samuel Clark | 65 | Brother-in-law | Labor | Pennsylvania |
| 13 | John Core | 63 | Lodger | — | Georgia |
| 14 | Mary Karcher | 62 | Head | — | Germany |
| 15 | Marie Karcher | 36 | Daughter | — | Pennsylvania |
| 16 | Frank Karcher | 33 | Son | Pipe Fitter Helper | Pennsylvania |
| 17 | Anna Karcher | 31 | Daughter | — | Pennsylvania |
| 18 | Loretta Karcher | 28 | Daughter | Gasket Maker | Pennsylvania |
| 19 | Helen Karcher | 26 | Daughter | — | Pennsylvania |
| 20 | Emil Kraemer | 48 | Lodger | — | Pennsylvania |
| 21 | Fred Velan | 30 | Head | Carpenter | Pennsylvania |
| 22 | Theresa Velan | 30 | Wife | — | Pennsylvania |
| 23 | Lois A. Velan | 1 | Daughter | — | Pennsylvania |
| 24 | Albert Kapphan | 64 | Father-in-law | — | Pennsylvania |
| 25 | James Madine | 53 | Head | — | England |
| 26 | Anna Madine | 56 | Wife | — | Pennsylvania |
| 27 | Regis Madine | 20 | Son | New Worker | Pennsylvania |
| 28 | Audrey Sheppard | 28 | Daughter | New Worker | Pennsylvania |
| 29 | Jane Sheppard | 5 | Granddaughter | — | Pennsylvania |
| 30 | Fred Friedrich | 48 | Head | Fireman | Pennsylvania |
| 31 | Tilly Friedrich | 46 | Wife | — | Pennsylvania |
| 32 | Fred Jr. Friedrich | 22 | Son | Sales Clerk | Pennsylvania |
| 33 | William Friedrich | 15 | Son | — | Pennsylvania |
| 34 | John Betz | 47 | Head | Labor | Pennsylvania |
| 35 | Emma Betz | 39 | Wife | — | Pennsylvania |
| 36 | John Betz | 14 | Son | — | Pennsylvania |
| 37 | Donald Betz | 12 | Son | — | Pennsylvania |
| 38 | Paul Betz | 10 | Son | — | Pennsylvania |
| 39 | James Betz | 9 | Son | — | Pennsylvania |
| 40 | Joseph Betz | 7 | Son | — | Pennsylvania |
Pedigree Summary
Helen + 1 sibling
Gen 1 · 2 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)