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 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnston |
| Given Name | Thomas W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Elgin |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Bartlett |
| Est. Birth Year | ~1925 |
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 |
|---|---|---|---|---|
| Ronald Johnston | Son | — | 8 | ~1932 |
| Arthur Johnston | Son | — | 13 | ~1927 |
| Thomas Johnston | Son | — | 15 | ~1925 |
| Willard Johnston | Son | — | 9 | ~1931 |
| Leroy Johnston | Son | — | 5 | ~1935 |
| Samuel Johnston | Head | — | 36 | ~1904 |
| Anna Johnston | Spouse | — | 34 | ~1906 |
| Robert Johnston | Son | — | 11 | ~1929 |
Census Appearances
1930
Kane, Illinois
Son, age 5
Kane, Illinois · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Thomas W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 15
Cook-County, Illinois · implied b. ~1925 — 8 household members
| Surname | Johnston |
| Given Name | Thomas W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Elgin |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Thomas Johnston
Son · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
Willard Johnston
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnston
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leroy Johnston
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ronald Johnston
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Johnston
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 — 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-t0627-00779-00944)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna M Bock | 67 | Head | — | Germany |
| 2 | William H Bock | 37 | Son | Sheet Metal Worker | Illinois |
| 3 | William M Kell | 42 | Head | Carpenter | Pennsylvania |
| 4 | Christina M Kell | 39 | Wife | Stenographer | Kentucky |
| 5 | William E Bull | 61 | Head | Proprietor | Germany |
| 6 | Ellen Bull | 62 | Wife | — | Illinois |
| 7 | Alfred W Erdman | 55 | Head | Farmer | Illinois |
| 8 | Louise A Erdman | 54 | Wife | — | Illinois |
| 9 | Adeline M Erdman | 29 | Daughter | Bookkeeper | Illinois |
| 10 | Dorothy H Erdman | 27 | Daughter | Stenographer | Illinois |
| 11 | Donald E Nicodemus | 29 | Head | Proprietor | Pennsylvania |
| 12 | Walter Mathiesen | 44 | Head | Carpenter | Illinois |
| 13 | Bertha Piegorsch | 61 | Head | — | Illinois |
| 14 | Nancy Piegorsch | 30 | Daughter | Gauger | Illinois |
| 15 | Gordon F Piegorsch | 28 | Son | Farmer | Illinois |
| 16 | Marguerite Piegorsch | 25 | Daughter | Milling Machine | Illinois |
| 17 | Donald Piegorsch | 21 | Son | Farmer | Illinois |
| 18 | Otto H Brenneman | 46 | Head | Free Lance Artist | Germany |
| 19 | Emma Brenneman | 42 | Wife | — | Germany |
| 20 | Samuel E Johnston | 36 | Head | Molder | Illinois |
| 21 | Anna P Johnston | 34 | Wife | — | Illinois |
| 22 | Thomas W Johnston THIS PERSON | 15 | Son | — | Illinois |
| 23 | Arthur S Johnston | 13 | Son | — | Illinois |
| 24 | Robert E Johnston | 11 | Son | — | Illinois |
| 25 | Willard A Johnston | 9 | Son | — | Illinois |
| 26 | Ronald Dale Johnston | 8 | Son | — | Illinois |
| 27 | Leroy R Johnston | 5 | Son | — | Illinois |
| 28 | John Jordi | 62 | Head | Farmer | Switzerland |
| 29 | Emilia Jordi | 61 | Wife | — | Germany |
| 30 | Mary Jorgensen | 49 | Boarder | Housekeeper | Iowa |
| 31 | Ralph B Mathiesen | 18 | Boarder | Gardener | Iowa |
| 32 | Joseph A Ronal | 32 | Head | Traffic Clerk | Illinois |
| 33 | Ann M Ronal | 27 | Wife | — | Connecticut |
| 34 | Virgil Scarbrough | 33 | Head | Shipping Clerk | Illinois |
| 35 | Hazel Scarbrough | 37 | Wife | — | Illinois |
| 36 | Lowell Scarbrough | 14 | Son | — | Illinois |
| 37 | Russell Scarbrough | 11 | Son | — | Illinois |
| 38 | Donna J Scarbrough | 6 | Daughter | — | Illinois |
| 39 | Theodore Koehler | 37 | Head | Cattle Salesman | Illinois |
| 40 | Leona H Koehler | 31 | Wife | — | Illinois |
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)