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Lillian Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Lillian Thomas across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents William & Nellie — first a daughter (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Thomas |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | McKeesport City |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | New Worker |
| Township / Ward | Mckeesport City |
| Est. Birth Year | ~1919 |
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 Lillian | Age | Birth yr |
|---|---|---|---|---|
| Nellie Thomas | Spouse | — | 63 | ~1877 |
| Lillian Thomas | Daughter | — | 21 | ~1919 |
| David Thomas | Son | — | 20 | ~1920 |
| Mary Thomas | Daughter | — | 26 | ~1914 |
| William Thomas | Son | — | 29 | ~1911 |
| William Thomas | Head | — | 65 | ~1875 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 1
Allegheny, Pennsylvania · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| 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
Allegheny, Pennsylvania
Daughter, age 11
Allegheny, Pennsylvania · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 21
Allegheny-County, Pennsylvania · implied b. ~1919 — 6 household members
| Surname | Thomas |
| Given Name | Lillian |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | McKeesport City |
| 1935 Residence (County) | Allegheny |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 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 Lillian Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Thomas (~0.92 confidence) and mother Nellie Thomas (~0.92 confidence) and mother Nellie Thomas (~0.92 confidence) and father William Thomas (~0.92 confidence) and father William Thomas (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Thomas
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Nellie Thomas
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Nellie Thomas
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
William Thomas
b. ~1885
Source father
● Household
· direct · ~0.92
Father
William Thomas
b. ~1885
Source father
● Household
· direct · ~0.92
This person
Anchor record
Lillian Thomas
Daughter · 1940 · age 21 · b. ~1919 · Pennsylvania
★ You are viewing this record
Sibling
William Thomas
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Thomas
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Thomas
Sibling · 1940 · age 26
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-t0627-03670-00431)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Thomas | 65 | Head | Painter | Pennsylvania |
| 2 | Nellie Thomas | 63 | Wife | — | Pennsylvania |
| 3 | William Thomas | 29 | Son | Shipper | Pennsylvania |
| 4 | Mary Thomas | 26 | Daughter | Filmmaker|Remaker | Pennsylvania |
| 5 | Lillian Thomas THIS PERSON | 21 | Daughter | New Worker | Pennsylvania |
| 6 | David Thomas | 20 | Son | Soda Clerk | Pennsylvania |
| 7 | Joseph Tombolo | 35 | Head | Stock Clerk | Pennsylvania |
| 8 | Pearl Tombolo | 32 | Wife | — | Pennsylvania |
| 9 | Benedict Arndt | 71 | Head | — | Germany |
| 10 | Mary Arndt | 70 | Wife | — | Germany |
| 11 | Rose Arndt | 30 | Daughter | Bookkeeper | Pennsylvania |
| 12 | Rose Ende Block 52 Arndt | None | Begins | — | — |
| 13 | Milton Butler | 64 | Head | Watchman | Ohio |
| 14 | Emma Butler | 64 | Wife | — | Ohio |
| 15 | Bernard Carothers | 42 | Head | Labor | Pennsylvania |
| 16 | Ruby Carothers | 41 | Wife | — | Ohio |
| 17 | Lu Jean Carothers | 14 | Daughter | — | Pennsylvania |
| 18 | Frank Clinton | 76 | Head | — | Pennsylvania |
| 19 | Laura Clinton | 72 | Wife | — | Pennsylvania |
| 20 | Frank Clinton | 32 | Son | Brakeman | Pennsylvania |
| 21 | Harriet Thomas | 79 | Sister-in-law | — | Pennsylvania |
| 22 | Weldon L. Roukes | 56 | Head | Stationary Engineer | Pennsylvania |
| 23 | Nettie E. Roukes | 51 | Wife | — | Ohio |
| 24 | Vernon Roukes | 21 | Son | Trucker | Pennsylvania |
| 25 | Roukes | None | — | — | — |
| 26 | Earl L. Day | 35 | Head | Messenger | Tennessee |
| 27 | Julia Day | 32 | Wife | — | Pennsylvania |
| 28 | Arthur Day | 14 | Son | — | Pennsylvania |
| 29 | Lillian Day | 6 | Daughter | — | Pennsylvania |
| 30 | Joseph Semakovski | 52 | Head | Labor | Pennsylvania |
| 31 | Sarah Semakovski | 52 | Wife | — | Poland |
| 32 | Stanley Semakovski | 20 | Son | New Worker | Pennsylvania |
| 33 | Helen Semakovski | 18 | Daughter | — | Pennsylvania |
| 34 | Nellie Semakovski | 15 | Daughter | — | Pennsylvania |
| 35 | Steven Semakovski | 12 | Son | — | Pennsylvania |
| 36 | Joseph H. Fizan | 40 | Head | Labor | Pennsylvania |
| 37 | Marie Fizan | 41 | Wife | — | Pennsylvania |
| 38 | Margaret Fizan | 15 | Daughter | — | Pennsylvania |
| 39 | William Fizan | 10 | Son | — | Pennsylvania |
| 40 | Joseph Fizan | 2 | Son | — | Pennsylvania |
Related Census Records
Pedigree Summary
Lillian + 3 siblings
Gen 1 · 5 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)