GJ
Gertrude Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Gertrude Johnson across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Peter & Peter — first a daughter (b.~1917), then head of a 6-person household.
Age 23
b. ~1917
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Johnson |
| Given Name | Gertrude |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Harrison Township |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Inspector |
| Industry | Steel mill |
| Class of Worker | PW |
| Hours Worked | 34 |
| Income (1939) | 900 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Inspector |
| Township / Ward | Harrison Township |
| Est. Birth Year | ~1917 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Gertrude | Age | Birth yr |
|---|---|---|---|---|
| Gertrude Johnson | Daughter | — | 23 | ~1917 |
| Dorothy Johnson | Daughter | — | 17 | ~1923 |
| Sally Johnson | Daughter | — | 8 | ~1932 |
| Peter Johnson | Head | — | 54 | ~1886 |
| Harvey Johnson | Son | — | 21 | ~1919 |
| Vilma Johnson | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 2
Allegheny, Pennsylvania · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Gertrude |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 13
Allegheny, Pennsylvania · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Gertrude E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 23
Allegheny-County, Pennsylvania · implied b. ~1917 — 6 household members
| Surname | Johnson |
| Given Name | Gertrude |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Harrison Township |
| 1935 Residence (County) | Allegheny |
| Occupation | Inspector |
| Industry | Steel mill |
| Class of Worker | PW |
| Hours Worked | 34 |
| Income (1939) | 900 |
| Highest Grade | Hs 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 Gertrude Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Johnson (~0.92 confidence) and father Peter Johnson (~0.92 confidence) and mother Hilma Johnson (~0.92 confidence) and mother Vilma Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Johnson
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Peter Johnson
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Hilma Johnson
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Vilma Johnson
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Gertrude Johnson
Daughter · 1940 · age 23 · b. ~1917 · Pennsylvania
★ You are viewing this record
Sibling
Harvey Johnson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Johnson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sally Johnson
Sibling · 1940 · age 8
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-t0627-03405-00138)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jane Q Dick | 32 | Wife | — | Pennsylvania |
| 2 | Alice Jane Dick | 14 | Daughter | — | Pennsylvania |
| 3 | Jack Dick | 12 | Son | — | Pennsylvania |
| 4 | Bill Dick | 7 | Son | — | Pennsylvania |
| 5 | Sandra Dick | 5 | Daughter | — | Pennsylvania |
| 6 | Beulah O'Malley | 47 | Head | — | Pennsylvania |
| 7 | Betty O'Malley | 22 | Daughter | Clerk | Pennsylvania |
| 8 | Lucille O'Malley | 20 | Daughter | Stenographer | Pennsylvania |
| 9 | Carol O'Malley | 18 | Daughter | — | Pennsylvania |
| 10 | Eileen O'Malley | 14 | Daughter | — | Pennsylvania |
| 11 | Peter Johnson | 54 | Head | Road Worker | Sweden |
| 12 | Vilma Q Johnson | 48 | Wife | — | Sweden |
| 13 | Gertrude Johnson THIS PERSON | 23 | Daughter | Inspector | Pennsylvania |
| 14 | Harvey Johnson | 21 | Son | Plumber | Pennsylvania |
| 15 | Dorothy Johnson | 17 | Daughter | — | Pennsylvania |
| 16 | Sally Johnson | 8 | Daughter | — | Pennsylvania |
| 17 | John Evans | 34 | Head | Forman | Pennsylvania |
| 18 | Minnie D Evans | 32 | Wife | — | Pennsylvania |
| 19 | David Evans | 12 | Son | — | Pennsylvania |
| 20 | Robert Evans | 10 | Son | — | Pennsylvania |
| 21 | Richard Evans | 6 | Son | — | Pennsylvania |
| 22 | Barbara Evans | 5 | Daughter | — | Pennsylvania |
| 23 | Thomas Lardin | 51 | Head | Supervisor | Pennsylvania |
| 24 | Maude R Lardin | 48 | Wife | — | Pennsylvania |
| 25 | John Lardin | 21 | Son | Laborer In Carboy Shop | Pennsylvania |
| 26 | Thomas Lardin | 15 | Son | — | Pennsylvania |
| 27 | Sara Lardin | 12 | Daughter | — | Pennsylvania |
| 28 | Kenneth Smeltzer | 26 | Head | Machinist | Pennsylvania |
| 29 | Alva S Smeltzer | 20 | Wife | — | Pennsylvania |
| 30 | Alan Smeltzer | 0 | Son | — | Pennsylvania |
| 31 | Raymond Hoffman | 42 | Head | Craneman | Pennsylvania |
| 32 | Mildred A Hoffman | 42 | Wife | — | Pennsylvania |
| 33 | Gretchen Hoffman | 17 | Daughter | — | Pennsylvania |
| 34 | Robert Hoffman | 14 | Son | — | Pennsylvania |
| 35 | Jess Emerick | 67 | Head | Helper | Pennsylvania |
| 36 | Blanche D Emerick | 65 | Wife | — | Pennsylvania |
| 37 | Joseph V. Bedner | 43 | Head | Floater | Pennsylvania |
| 38 | Freda A Bedner | 39 | Wife | Label Boater | Pennsylvania |
| 39 | Marilyn Bedner | 17 | Daughter | — | Pennsylvania |
| 40 | Imogene Bedner | 14 | Daughter | — | Pennsylvania |
Related Census Records
Pedigree Summary
Gertrude + 3 siblings
Gen 1 · 4 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)