JT
Jack Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · York-County, Pennsylvania
Our Model Tree links this Jack Thomas across the 1930 and 1940 US Censuses in York-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 6-person household.
Age 18
b. ~1922
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | York-County, Pennsylvania |
| Surname | Thomas |
| Given Name | Jack L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | York City |
| 1935 Residence (County) | York |
| Additional Details | |
| Occupation | Janitor |
| Industry | School Library and Study Hall |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 176 |
| Highest Grade | No C-1 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Janitor |
| Township / Ward | York City |
| Est. Birth Year | ~1922 |
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 Jack | Age | Birth yr |
|---|---|---|---|---|
| Mabel Thomas | Daughter | — | 15 | ~1925 |
| Ralph Thomas | Son | — | 13 | ~1927 |
| Ralph Thomas | Head | — | 31 | ~1909 |
| Emma Thomas | Daughter | — | 16 | ~1924 |
| Lucy Thomas | Spouse | — | 31 | ~1909 |
| Jack Thomas | Son | — | 18 | ~1922 |
Census Appearances
1930
York, Pennsylvania
Son, age 8
York, Pennsylvania · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Jack L. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| 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
York-County, Pennsylvania
Son, age 18
York-County, Pennsylvania · implied b. ~1922 — 6 household members
| Surname | Thomas |
| Given Name | Jack L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | York City |
| 1935 Residence (County) | York |
| Occupation | Janitor |
| Industry | School Library and Study Hall |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 176 |
| Highest Grade | No C-1 |
| 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 Jack Thomas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Thomas
Son · 1940 · age 18 · b. ~1922 · Pennsylvania
★ You are viewing this record
Sibling
Mabel Thomas
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emma Thomas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Thomas
Sibling · 1940 · age 13
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 — York-County, Pennsylvania
Open full size
1940 US Federal Census — York-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03646-00646)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James H. Thompson | 43 | Head | House Painter | Pennsylvania |
| 2 | Florence H. Thompson | 33 | Wife | Seamstress | Pennsylvania |
| 3 | Kenneth Gunnell | 11 | Grandson | — | Pennsylvania |
| 4 | Richard Shank | 28 | Brother-in-law | — | Pennsylvania |
| 5 | Raymond M. Shank | 25 | Brother-in-law | Laborer | Pennsylvania |
| 6 | Earl L. Shank | 22 | Brother-in-law | Care Taker | Pennsylvania |
| 7 | Woodrow W. Werger | 26 | Head | Draughtsman | Pennsylvania |
| 8 | Helen R. Werger | 23 | Wife | Saleswoman | Pennsylvania |
| 9 | Robert W. Trumbine | 32 | Head | Truck Driver | Pennsylvania |
| 10 | Dorothy E. Trumbine | 25 | Wife | — | Pennsylvania |
| 11 | Robert L. Trumbine | 6 | Son | — | Pennsylvania |
| 12 | Russell L. Lease | 32 | Head | Assistant Pressman | Pennsylvania |
| 13 | Blanche Lease | 34 | Wife | — | Pennsylvania |
| 14 | Anna M. Lease | 17 | Daughter | — | Pennsylvania |
| 15 | Charles A. Hoffman | 70 | Head | Tool Room Clerk | Pennsylvania |
| 16 | Anna R. Hoffman | 67 | Wife | — | Pennsylvania |
| 17 | Carl Lau | 43 | Head | Trucker | Pennsylvania |
| 18 | Catherine E. Lau | 43 | Wife | — | Pennsylvania |
| 19 | Carl Jr. Lau | 20 | Son | — | Pennsylvania |
| 20 | David P. Lau | 17 | Son | — | Pennsylvania |
| 21 | Hattie E. Jones | 22 | Head | — | Pennsylvania |
| 22 | Irene E. Myers | 29 | Daughter | Machine Operator | Pennsylvania |
| 23 | Frederick H. Myers | 11 | Grandson | — | Pennsylvania |
| 24 | Ralph F. Thomas | 31 | Head | Machinist | Pennsylvania |
| 25 | Lucy M. Thomas | 31 | Wife | — | Pennsylvania |
| 26 | Jack L. Thomas THIS PERSON | 18 | Son | Janitor | Pennsylvania |
| 27 | Emma J. Thomas | 16 | Daughter | — | Pennsylvania |
| 28 | Mabel J. Thomas | 15 | Daughter | — | Pennsylvania |
| 29 | Ralph F. Jr. Thomas | 13 | Son | — | Pennsylvania |
| 30 | George W. Deetand | 57 | Head | Foreman | Pennsylvania |
| 31 | Edna M. Deetand | 46 | Wife | — | Pennsylvania |
| 32 | Doris M. Deetand | 15 | Daughter | — | Pennsylvania |
| 33 | Phyllis M. Deetand | 12 | Daughter | — | Pennsylvania |
| 34 | James A. Liekenburg | 35 | Head | Baker | Pennsylvania |
| 35 | Grace M. Liekenburg | 35 | Wife | — | Pennsylvania |
| 36 | Austin R. Liekenburg | 17 | Son | — | Pennsylvania |
| 37 | Norma J. Liekenburg | 12 | Daughter | — | Pennsylvania |
| 38 | Rose R. Liekenburg | 9 | Daughter | — | Pennsylvania |
| 39 | Mabel J. Liekenburg | 4 | Daughter | — | Pennsylvania |
| 40 | Clarence L. Waltermeyer | 53 | Head | Carpenter | Pennsylvania |
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)