TJ
Thomas Johnston — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Thomas Johnston across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Switchman |
| Industry | Chg Rapid Transit |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Switchman |
| Township / Ward | Chicago |
| Est. Birth Year | ~1905 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Rose Johnston | Spouse | — | 32 | ~1908 |
| Thomas Johnston | Son | — | 10 | ~1930 |
| Thomas Johnston | Head | — | 35 | ~1905 |
| James Johnston | Son | — | 8 | ~1932 |
Census Appearances
1920
Cook, Illinois
Son, age 16
Cook, Illinois · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1910 |
| Naturalization Status | Alien |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | Em |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Cook, Illinois
Head, age 25
Cook, Illinois · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1923 |
| Age at First Marriage | 21 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Switchman |
| Industry | Elevated Railway |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 45 |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Cook-County, Illinois
Head, age 35
Cook-County, Illinois · implied b. ~1905 — 4 household members
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Switchman |
| Industry | Chg Rapid Transit |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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.
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This person
Anchor record
Thomas Johnston
Head · 1940 · age 35 · b. ~1905 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00957-00167)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lillian Finnigan | 38 | Wife | — | Tyndall So Dakota |
| 2 | William Finnigan | 4 | Son | — | Chicago Ill |
| 3 | Ernest Bossert | 38 | Head | Meat Dealer | Chicago Ill |
| 4 | Lillian Bossert | 47 | Wife | — | St Paul Minn |
| 5 | Richard Kamm | 39 | Head | Bank Teller | Germany |
| 6 | Martha Kamm | 36 | Wife | — | Germany |
| 7 | Marion Kamm | 7 | Daughter | — | Chicago Ill |
| 8 | John Conway | 33 | Head | Depot Passenger Agent | Chicago Ill |
| 9 | Barbara Conway | 33 | Wife | — | Chicago Ill |
| 10 | Marilyn Conway | 2 | Daughter | — | Chicago Ill |
| 11 | Thomas Johnston THIS PERSON | 35 | Head | Switchman | Scotland |
| 12 | Rose Johnston | 32 | Wife | — | Cleveland Ohio |
| 13 | Thomas Johnston | 10 | Son | — | Chicago Ill |
| 14 | James Johnston | 8 | Son | — | Chicago Ill |
| 15 | William Mangan | 40 | Head | Janitor | Chicago Ill |
| 16 | Anna Mangan | 41 | Wife | — | Nokomis Ill |
| 17 | Frank M. Wilson | 66 | Head | Accountant | Rome Indiana |
| 18 | Lulie Wilson | 61 | Wife | — | Genoa Indiana |
| 19 | Michael Schneider | 43 | Head | Mechanic | Romania |
| 20 | Mary Schneider | 45 | Wife | — | Hungary |
| 21 | Michael Jr Schneider | 21 | Son | Apprentice | Chicago Ill |
| 22 | Mary Schneider | 19 | Daughter | Beauty Operator | Chicago Ill |
| 23 | James Kelly | 33 | Head | Detective | Chicago Ill |
| 24 | Ellen Kelly | 29 | Wife | — | Chicago Ill |
| 25 | James Kelly | 3 | Son | — | Chicago Ill |
| 26 | Henrietta Lawson | 60 | Mother-in-law | — | Urgamia Minn |
| 27 | Kathleen Morden | 17 | Niece | — | Chicago Ill |
| 28 | James Morden | 19 | Nephew | — | Chicago Ill |
| 29 | Peter Schneider | 70 | Head | Watchman | Hungary |
| 30 | Frances Schneider | 65 | Wife | — | Hungary |
| 31 | Leon R. Ike | 49 | Head | Machinist | Nebraska |
| 32 | Luella Ike | 49 | Wife | — | Pittsfield Ill |
| 33 | Lawrence Griffin | 47 | Head | Salesman | Danville Ill |
| 34 | Blanche Griffin | 47 | Wife | — | Danville Ill |
| 35 | Arlyn Griffin | 19 | Son | Service Man | Wilmer Minn |
| 36 | Eloise Griffin | 16 | Son | — | Chicago Ill |
| 37 | Keith Griffin | 14 | Son | — | Chicago Ill |
| 38 | Rose Gilmore | 68 | Head | — | Northern Ireland |
| 39 | Homer Carrick | 27 | Son-in-law | Driver | Chicago Ill |
| 40 | Elizabeth Carrick | 29 | Daughter | Clerical Work | Chicago Ill |
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)