LJ
Leslie Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Leslie Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Frances — first a head (b.~1900), then head of a 3-person household.
Age 40
b. ~1900
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Leslie |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Steamfitter |
| Industry | Oil Co. |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 1820 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Steamfitter |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Leslie | Age | Birth yr |
|---|---|---|---|---|
| Joan Johnson | Daughter | — | 5 | ~1935 |
| Ruth Johnson | Spouse | — | 38 | ~1902 |
| Leslie Johnson | Head | — | 40 | ~1900 |
Census Appearances
1920
Cook, Illinois
Son, age 22
Cook, Illinois · implied b. ~1898 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leslie E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Fireman |
| Industry | Locomotive |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Head, age 31
Cook, Illinois · implied b. ~1899 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leslie E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 25 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Paper Fitter |
| Industry | Oil Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 6000 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 40
Cook-County, Illinois · implied b. ~1900 — 3 household members
| Surname | Johnson |
| Given Name | Leslie |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Steamfitter |
| Industry | Oil Co. |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 1820 |
| 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 Leslie Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frances Johnson (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frances Johnson
b. ~1864
Source father
● Household
· direct · ~0.92
This person
Anchor record
Leslie Johnson
Head · 1940 · age 40 · b. ~1900 · Illinois
★ You are viewing this record
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
39 people indexed on this census page (nara:1940:m-t0627-00938-01046)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert J. Duffy | 50 | Head | Station Master | Illinois |
| 2 | Jessie Duffy | 49 | Wife | — | Illinois |
| 3 | Robert Jr. Duffy | 23 | Son | Electrician | Illinois |
| 4 | Leslie Johnson THIS PERSON | 40 | Head | Steamfitter | Illinois |
| 5 | Ruth Johnson | 38 | Wife | — | Illinois |
| 6 | Joan Johnson | 5 | Daughter | — | Illinois |
| 7 | Abel De Haan | 45 | Head | Real Estate Broker | Illinois |
| 8 | Edna De Haan | 40 | Wife | — | Illinois |
| 9 | Edward De Haan | 21 | Son | Real Estate Broker | Illinois |
| 10 | Elaine De Haan | 19 | Daughter | Secretary | Illinois |
| 11 | William De Haan | 18 | Son | — | Illinois |
| 12 | Carl H. Lundgren | 57 | Head | Locomotive Engineer | Sweden |
| 13 | Alice D. Lundgren | 51 | Wife | — | Illinois |
| 14 | Arthur Lundgren | 22 | Son | Meter Reader | Illinois |
| 15 | Stephen Lorenz | 53 | Head | Chipper | Hungary |
| 16 | Teresa Lorenz | 49 | Wife | — | Hungary |
| 17 | Charles Davis | 69 | Head | Clerk | Illinois |
| 18 | Clara Davis | 59 | Wife | Sales Clerk | Illinois |
| 19 | John Andrich | 52 | Head | Watchman | Austria |
| 20 | Gertrude Andrich | 44 | Wife | Cleaning | Austria |
| 21 | Julia Telby | 38 | Head | Factory Worker | Hungary |
| 22 | Ray Telby | 15 | Son | — | Illinois |
| 23 | Betty Telby | 11 | Daughter | — | Illinois |
| 24 | Bert Telby | 68 | Father-in-law | — | Illinois |
| 25 | Stanley Radziwonowicz | 54 | Head | Car Carpenter | Poland |
| 26 | Anna Radziwonowicz | 50 | Wife | — | Poland |
| 27 | Chester Radziwonowicz | 27 | Son | Tracer | Illinois |
| 28 | Helen Radziwonowicz | 29 | Daughter | Packer | Illinois |
| 29 | Walter Radziwonowicz | 15 | Son | — | Illinois |
| 30 | John Theis | 47 | Head | Regional Supervisor | Illinois |
| 31 | Dorothy Theis | 40 | Wife | — | Illinois |
| 32 | John Theis | 16 | Son | — | Illinois |
| 33 | William Schuster | 32 | Head | Truck Driver | Illinois |
| 34 | Grace Schuster | 32 | Wife | — | Illinois |
| 35 | Grace Schuster | 11 | Daughter | — | Illinois |
| 36 | Helen Schuster | 9 | Daughter | — | Illinois |
| 37 | Andrew Schuster | 68 | Father | — | Germany |
| 38 | Peter Mcgovern | 55 | Head | Fireman | Illinois |
| 39 | Kathryn Mcgovern | 55 | Wife | — | Nevada |
Pedigree Summary
Leslie
Gen 1 · 1 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)