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David Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this David Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Gustav & Helena — first a son (b.~1900), then head of a 7-person household.
Age 40
b. ~1900
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Rolling Mill |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 1400 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Rolling Mill |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1900 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to David | Age | Birth yr |
|---|---|---|---|---|
| Ruth Johnson | Daughter | — | 25 | ~1915 |
| Edith Johnson | Daughter | — | 34 | ~1906 |
| Alma Johnson | Daughter | — | 48 | ~1892 |
| Gustav Johnson | Head | — | 75 | ~1865 |
| David Johnson | Son | — | 40 | ~1900 |
| Theodore Johnson | Son | — | 32 | ~1908 |
| Erick Johnson | Son | — | 37 | ~1903 |
Census Appearances
1920
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1902 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Helper |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 29
Cook, Illinois · implied b. ~1901 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Receiving Clerk |
| Industry | Oil Refinery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 40
Cook-County, Illinois · implied b. ~1900 — 7 household members
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Rolling Mill |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 1400 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| 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 David Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Gustav Johnson (~0.92 confidence) and mother Helena Johnson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Gustav Johnson
b. ~1865
Source father
● Household
· direct · ~0.92
Mother
Helena Johnson
b. ~1874
Source mother
● Household
· direct · ~0.92
This person
Anchor record
David Johnson
Son · 1940 · age 40 · b. ~1900 · Illinois
★ You are viewing this record
Sibling
Theodore Johnson
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Johnson
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alma Johnson
Sibling · 1940 · age 48
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edith Johnson
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Erick Johnson
Sibling · 1940 · age 37
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-t0627-00942-00605)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen M. York | 9 | Daughter | — | Illinois |
| 42 | Barbara York | 4 | Daughter | — | Illinois |
| 43 | James Harris | 57 | Head | Relief Man | Illinois |
| 44 | Emma Harris | 54 | Wife | — | Illinois |
| 45 | Martin Petric | 57 | Head | Stationary Engineer | Jugo Slavia |
| 46 | Mary Petric | 44 | Wife | — | Jugo Slavia |
| 47 | Mary Jane Petric | 13 | Daughter | — | Illinois |
| 48 | Dolores A. Petric | 11 | Daughter | — | Illinois |
| 49 | Joe Barbich | 37 | Head | Oven Man | Penn |
| 50 | Sophie Barbich | 31 | Wife | — | Jugo Slavia |
| 51 | Violet Barbich | 9 | Daughter | — | Illinois |
| 52 | Anna Barbich | 7 | Daughter | — | Illinois |
| 53 | Barbra Barbich | 4 | Daughter | — | Illinois |
| 54 | Katharin Grand | 49 | Head | — | Sweden |
| 55 | Stig Grand | 21 | Son | Guard | Illinois |
| 56 | Ethel Grand | 20 | Daughter | New Worker | Illinois |
| 57 | George Grand | 18 | Son | Attendant | Illinois |
| 58 | Curtis Grand | 16 | Son | — | Illinois |
| 59 | Kenneth Grand | 15 | Son | — | Illinois |
| 60 | Walter Grand | 13 | Son | — | Illinois |
| 61 | Ralph Grand | 11 | Son | — | Illinois |
| 62 | Raymond Grand | 9 | Son | — | Illinois |
| 63 | Clarence Grand | 8 | Son | — | Illinois |
| 64 | Robert Grand | 23 | Son | Helper In Open Hearth | Illinois |
| 65 | Irene Grand | 22 | Daughter-in-law | — | Indiana |
| 66 | Charles Stilloff | 70 | Head | Roll Turner | Denmark |
| 67 | Christina Stilloff | 70 | Wife | — | Denmark |
| 68 | Gustav Johnson | 75 | Head | — | Sweden |
| 69 | Alma Johnson | 48 | Daughter | — | Sweden |
| 70 | David Johnson THIS PERSON | 40 | Son | Rolling Mill | Illinois |
| 71 | Erick Johnson | 37 | Son | Machinist | Illinois |
| 72 | Edith Johnson | 34 | Daughter | Office Girl | Illinois |
| 73 | Theodore Johnson | 32 | Son | Helper In Machine Shop | Illinois |
| 74 | Ruth Johnson | 25 | Daughter | Clerk | Illinois |
| 75 | Edward Mangan | 45 | Head | — | Ireland |
| 76 | Briget Mangan | 44 | Wife | — | Ireland |
| 77 | Edward Mangan | 16 | Son | Messenger | Illinois |
| 78 | Mary Mangan | 14 | Daughter | — | Illinois |
| 79 | Margaret Mangan | 11 | Daughter | — | Illinois |
| 80 | Thomas Lally | 63 | Head | Street Construction | Ireland |
Pedigree Summary
David + 5 siblings
Gen 1 · 2 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)