TJ
Thomas Johnston — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Thomas Johnston across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 9-person household.
Age 15
b. ~1915
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1915 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| William Johnston | Son | — | 18 | ~1912 |
| Eileen Johnston | Daughter | — | 7 | ~1923 |
| Joseph Johnston | Son | — | 12 | ~1918 |
| June Johnston | Daughter | — | 4 | ~1926 |
| Thomas Johnston | Son | — | 15 | ~1915 |
| Alice Johnston | Spouse | — | 37 | ~1893 |
| Charlotte Johnston | Daughter | — | 9 | ~1921 |
| Marjorie Johnston | Daughter | — | 17 | ~1913 |
| Thomas Johnston | Head | — | 42 | ~1888 |
Census Appearances
1930
Cook, Illinois
Son, age 15
Cook, Illinois · implied b. ~1915 — 9 household members
| Surname | Johnston |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Other, age 26
Cook-County, Illinois · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnstone |
| Given Name | Thomas |
| Relationship to Head | in-law |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Miner |
| Industry | subway |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 1360 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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 · 1930 · age 15 · b. ~1915 · Illinois
★ You are viewing this record
Sibling
Marjorie Johnston
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Johnston
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Johnston
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
June Johnston
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charlotte Johnston
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Johnston
Sibling · 1930 · age 12
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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel436:0570)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Mckenna | 32 | Head | Laborer | Illinois |
| 2 | Anna Mckenna | 26 | Wife | — | Illinois |
| 3 | William Mckenna | 8 | Son | — | Illinois |
| 4 | Joseph Jr Mckenna | 2 | Son | — | Illinois |
| 5 | Bridget Donley | 67 | Head | — | Irish Free State |
| 6 | Mary Donley | 47 | Daughter | — | Irish Free State |
| 7 | Joseph Mcquaid | 35 | Head | Chauffeur | Illinois |
| 8 | Catherine Mcquaid | 33 | Wife | — | Illinois |
| 9 | Joseph Jr Mcquaid | 12 | Son | — | Illinois |
| 10 | William Piper | 35 | Head | Laborer | Illinois |
| 11 | Elsie Piper | 31 | Wife | — | Illinois |
| 12 | Doris Piper | 13 | Daughter | — | Illinois |
| 13 | Ferdinand Dykeman | 78 | Head | — | Germany |
| 14 | Mary Mitchell | 59 | Head | — | Irish Free State |
| 15 | John Mitchell | 26 | Son | Laborer | Illinois |
| 16 | Lucas Mcinerney | 45 | Head | Laborer | Illinois |
| 17 | John Miller | 45 | Head | Laborer | England |
| 18 | Edith Miller | 45 | Wife | — | Illinois |
| 19 | Charles Miller | 20 | Son | Laborer | Illinois |
| 20 | James Zender | 75 | Boarder | Chauffeur | Illinois |
| 21 | John Ryan | 17 | Boarder | Helper | Illinois |
| 22 | Elizabeth Doll | 47 | Head | — | Illinois |
| 23 | Mary Doll | 16 | Daughter | — | Illinois |
| 24 | June Doll | 14 | Daughter | — | Illinois |
| 25 | Gertrude Doll | 12 | Daughter | — | Illinois |
| 26 | Robert Doll | 10 | Son | — | Illinois |
| 27 | George Doll | 8 | Son | — | Illinois |
| 28 | Oscar Petrey | 49 | Head | Laborer | Ohio |
| 29 | Kate Petrey | 43 | Wife | — | Illinois |
| 30 | John Thaler | 52 | Brother-in-law | Laborer | Illinois |
| 31 | Thomas Johnston | 42 | Head | Laborer | Illinois |
| 32 | Alice Johnston | 37 | Wife | — | Illinois |
| 33 | William Johnston | 18 | Son | Laborer | Illinois |
| 34 | Marjorie Johnston | 17 | Daughter | Operator | Illinois |
| 35 | Thomas Johnston THIS PERSON | 15 | Son | — | Illinois |
| 36 | Joseph Johnston | 12 | Son | — | Illinois |
| 37 | Charlotte Johnston | 9 | Daughter | — | Illinois |
| 38 | Eileen Johnston | 7 | Daughter | — | Illinois |
| 39 | June Johnston | 4 | Daughter | — | Illinois |
| 40 | Edward Tully | 31 | Head | Box Maker | Illinois |
| 41 | Loretta Tully | 27 | Wife | — | Illinois |
| 42 | Edward Tully | 9 | Son | — | Illinois |
| 43 | Edward Jr Tully | 4 | Son | — | Illinois |
| 44 | James Murphy | 40 | Head | Chauffeur | Illinois |
| 45 | Matthew Murphy | 30 | Brother | Laborer | Illinois |
| 46 | Philip Ryan | 34 | Brother-in-law | Laborer | Illinois |
| 47 | Angeline Ryan | 31 | Sister | — | Illinois |
| 48 | Matthew Ryan | 12 | Nephew | — | Illinois |
| 49 | Philip Ryan | 9 | Nephew | — | Illinois |
| 50 | Angeline Ryan | 7 | Niece | — | Illinois |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)