TJ
Thomas Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Thomas Johnston across the 1920, 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Joseph & Thomas — first a son (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Male
Son
Born: PENNSYLVANIA
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | JOHNSTON |
| Given Name | THOMAS |
| Relationship to Head | SON |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | PENNSYLVANIA |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Additional Details | |
| Occupation | SHIPPER |
| Industry | MUSIC STORE |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 372 |
| Highest Grade | H-4 |
| 1935 Residence | SAME HOUSE |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Shipper |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1920 |
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 Thomas | Age | Birth yr |
|---|---|---|---|---|
| Catherine Johnston | Daughter | — | 39 | ~1901 |
| Anna Johnston | Head | — | 60 | ~1880 |
| Margaret Downey | Daughter | — | 24 | ~1916 |
| John Downey | Other | — | 25 | ~1915 |
| Thomas Johnston | Son | — | 20 | ~1920 |
| Margaret Downey | Daughter | — | 4 | ~1936 |
Census Appearances
1920
Philadelphia, Pennsylvania
Son, age
Philadelphia, Pennsylvania · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Son, age 10
Philadelphia, Pennsylvania · implied b. ~1920 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 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
Philadelphia-County, Pennsylvania
Son, age 20
Philadelphia-County, Pennsylvania · implied b. ~1920 — 6 household members
| Surname | JOHNSTON |
| Given Name | THOMAS |
| Relationship to Head | SON |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | PENNSYLVANIA |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Occupation | SHIPPER |
| Industry | MUSIC STORE |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 372 |
| Highest Grade | H-4 |
| 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 Joseph Saff (~0.92 confidence) and father Thomas Johnston (~0.84 confidence) and mother Mary Saff (~0.92 confidence) and mother Elizabeth Johnston (~0.84 confidence) and mother Anna Johnston (~0.92 confidence) and father Elmer Johnston (~0.92 confidence) and mother Catharine Johnston (~0.92 confidence) and mother Catherine Johnston (~0.92 confidence). The pedigree spans 2 generations with 8 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.9
Father
Joseph Saff
b. ~1864
Source father
● Household
· direct · ~0.92
Father
Thomas Johnston
b. ~1869
Source father>father
● Household
· direct · ~0.84
Mother
Mary Saff
b. ~1874
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Johnston
b. ~1876
Source father>mother
● Household
· direct · ~0.84
Mother
Anna Johnston
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Elmer Johnston
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Catharine Johnston
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Catherine Johnston
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Johnston
Son · 1940 · age 20 · b. ~1920 · Pennsylvania
★ You are viewing this record
Sibling
Catherine Johnston
Sibling · 1940 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Downey
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Downey
Sibling · 1940 · age 4
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03736-00615)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Josephine Mongeluzzi | 63 | HEAD | — | ITALY |
| 2 | Joseph Mongeluzzi | 37 | SON | Circus Worker | PENNSYLVANIA |
| 3 | Anthony Mongeluzzi | 30 | SON | Laborer | PENNSYLVANIA |
| 4 | Helen Mongeluzzi | 24 | DAUGHTER IN-LAW | — | PENNSYLVANIA |
| 5 | Joseph Mongeluzzi | 5 | GRAND-SON | — | PENNSYLVANIA |
| 6 | Helen Mongeluzzi | 3 | GRAND-DAUGHTER | — | PENNSYLVANIA |
| 7 | Josephine Mongeluzzi | 2 | GRAND-DAUGHTER | — | PENNSYLVANIA |
| 8 | Catherine Mongeluzzi | 0 | GRAND-DAUGHTER | — | PENNSYLVANIA |
| 9 | William Riley | 44 | HEAD | Stationary Engineer | PENNSYLVANIA |
| 10 | May Riley | 46 | WIFE | — | PENNSYLVANIA |
| 11 | William Jr Riley | 23 | SON | Platform Man | PENNSYLVANIA |
| 12 | Vincent Riley | 21 | SON | Salesman | PENNSYLVANIA |
| 13 | William Kling | 66 | HEAD | — | PENNSYLVANIA |
| 14 | Mary Kling | 55 | WIFE | — | PENNSYLVANIA |
| 15 | William Kling | 21 | SON | Apprentice Boy | PENNSYLVANIA |
| 16 | Doris M Kling | 19 | DAUGHTER | Clerk | PENNSYLVANIA |
| 17 | Anna Johnston | 60 | HEAD | — | PENNSYLVANIA |
| 18 | Catherine Johnston | 39 | DAUGHTER | Housework | PENNSYLVANIA |
| 19 | Thomas Johnston THIS PERSON | 20 | SON | Shipper | PENNSYLVANIA |
| 20 | John Downey | 25 | SON-IN LAW | Laborer | PENNSYLVANIA |
| 21 | Margaret Downey | 24 | DAUGHTER | — | PENNSYLVANIA |
| 22 | Margaret Downey | 4 | DAUGHTER | — | PENNSYLVANIA |
| 23 | Albert Baney | 79 | HEAD | — | PENNSYLVANIA |
| 24 | James P Hain | 67 | HEAD | — | PENNSYLVANIA |
| 25 | Gertrude Hain | 60 | WIFE | — | PENNSYLVANIA |
| 26 | James B Hain | 37 | SON | Sheet Metal Worker | PENNSYLVANIA |
| 27 | Alvia Howard | 34 | LODGER | Sheet Metal Worker | IOWA |
| 28 | William Mcginnis | 38 | HEAD | Interviewer | PENNSYLVANIA |
| 29 | Elizabeth Mcginnis | 37 | WIFE | Counter Girl | PENNSYLVANIA |
| 30 | Elizabeth Mcginnis | 15 | DAUGHTER | — | PENNSYLVANIA |
| 31 | William J. Mcginnis | 11 | SON | — | PENNSYLVANIA |
| 32 | John Sweet | 45 | HEAD | — | PENNSYLVANIA |
| 33 | Alice Sweet | 46 | WIFE | — | PENNSYLVANIA |
| 34 | Joseph Sweet | 19 | SON | — | PENNSYLVANIA |
| 35 | Mary Sweet | 14 | DAUGHTER | — | PENNSYLVANIA |
| 36 | Catherine Sweet | 12 | DAUGHTER | — | PENNSYLVANIA |
| 37 | Jean Sweet | 10 | DAUGHTER | — | PENNSYLVANIA |
| 38 | Robert Boyd | 62 | HEAD | Night Watchman | PENNSYLVANIA |
| 39 | Anna Boyd | 62 | WIFE | — | PENNSYLVANIA |
| 40 | Ida Boyd | 23 | DAUGHTER | Candy Worker | PENNSYLVANIA |
Related Census Records
Pedigree Summary
Thomas + 3 siblings
Gen 1 · 6 parents
~0.92
Gen 2 · 2 grandparents
~0.84
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)