TJ
Thomas Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Thomas Johnston across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Robert & Charlotte — first a head (b.~1900), then head of a 8-person household.
Age 40
b. ~1900
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Machinist |
| Industry | Aeroplane Mfg Co |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1810 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Machinist |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1900 |
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 Thomas | Age | Birth yr |
|---|---|---|---|---|
| Mildred Johnston | Daughter | — | 4 | ~1936 |
| Catherine Johnston | Daughter | — | 6 | ~1934 |
| Raymond Johnston | Son | — | 8 | ~1932 |
| Thomas Johnston | Son | — | 19 | ~1921 |
| Harold Johnston | Son | — | ~1940 | |
| Thomas Johnston | Head | — | 40 | ~1900 |
| Gladus Johnston | Daughter | — | 15 | ~1925 |
| Gladus Johnston | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Allegheny, Pennsylvania
Son, age 18
Allegheny, Pennsylvania · implied b. ~1902 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas K. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Buffer |
| Industry | Engine Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Head, age 28
Allegheny, Pennsylvania · implied b. ~1902 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 18 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | machinist |
| Industry | machine shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 37.50 |
| Radio Set | R |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Head, age 40
Allegheny-County, Pennsylvania · implied b. ~1900 — 8 household members
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Machinist |
| Industry | Aeroplane Mfg Co |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1810 |
| Highest Grade | Hs 3 |
| 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 Thomas Johnston across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Johnston (~0.92 confidence) and mother Charlotte Johnston (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Johnston
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Charlotte Johnston
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Johnston
Head · 1940 · age 40 · b. ~1900 · Pennsylvania
★ You are viewing this record
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-t0627-03671-00303)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marie Derby | 27 | daughter | Assembler | Pennsylvania |
| 42 | John Herrler | 37 | Head | Cabinet Maker | Germany |
| 43 | Margaret Herrler | 36 | wife | — | Germany |
| 44 | Margaret Herrler | 8 | daughter | — | Pennsylvania |
| 45 | Elizabeth Fark | 47 | Head | Matron | Pennsylvania |
| 46 | John R Fark | 27 | Son | Resistance Welder | Pennsylvania |
| 47 | Dorothy Fark | 19 | daughter | — | Pennsylvania |
| 48 | Owen Kelly | 37 | Head | Coal Miner | Pennsylvania |
| 49 | Catherine Kelly | 57 | Mother | Janitress | Ohio |
| 50 | Florence Kelly | 17 | Sister | — | Pennsylvania |
| 51 | William K Gooden | 57 | Head | Millwright | Virginia |
| 52 | Iene Gooden | 51 | Wife | — | Virginia |
| 53 | William H Gooden | 20 | Son | New Worker | Virginia |
| 54 | Joseph Madrishin | 29 | Head | Sales Clerk | Austria |
| 55 | Lucille Madrishin | 37 | Wife | — | Ohio |
| 56 | Shirley Madrishin | 11 | daughter | — | Pennsylvania |
| 57 | Robert Madrishin | 10 | Son | — | Pennsylvania |
| 58 | Dorothy Madrishin | 8 | daughter | — | Pennsylvania |
| 59 | John Madrishin | 7 | Son | — | Pennsylvania |
| 60 | James Madrishin | 7 | Son | — | Pennsylvania |
| 61 | William Madrishin | 3 | Son | — | Pennsylvania |
| 62 | Edward Yokel | 36 | Head | Truck Driver | Pennsylvania |
| 63 | Marie Yokel | 37 | Wife | — | Pennsylvania |
| 64 | Edward Yokel | 13 | Son | — | Pennsylvania |
| 65 | Richard Yokel | 11 | Son | — | Pennsylvania |
| 66 | Thomas Yokel | 9 | Son | — | Pennsylvania |
| 67 | Grace Yokel | 7 | daughter | — | Pennsylvania |
| 68 | Thomas Johnston THIS PERSON | 40 | Head | Machinist | Pennsylvania |
| 69 | Gladus Johnston | 39 | Wife | — | Pennsylvania |
| 70 | Thomas Johnston | 19 | Son | — | Pennsylvania |
| 71 | Gladus Johnston | 15 | daughter | — | Pennsylvania |
| 72 | Raymond Johnston | 8 | Son | — | Pennsylvania |
| 73 | Catherine Johnston | 6 | daughter | — | Pennsylvania |
| 74 | Mildred Johnston | 4 | daughter | — | Pennsylvania |
| 75 | Harold Johnston | 0 | Son | — | Pennsylvania |
| 76 | Harry Chillcott | 44 | Head | Payroll Clerk | Pennsylvania |
| 77 | Nellie Chillcott | 42 | Wife | — | Pennsylvania |
| 78 | Stanley Phillips | 37 | Head | Machinist | Pennsylvania |
| 79 | Anna Phillips | 33 | Wife | — | Pennsylvania |
| 80 | Stanley Phillips | 12 | Son | — | Pennsylvania |
Related Census Records
Pedigree Summary
Thomas
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)