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 Frank & Lenier — first a head (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
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 | 35 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Tinner |
| Industry | Sheet Metal Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 362 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Tinner |
| Township / Ward | Chicago City |
| 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 Leslie | Age | Birth yr |
|---|---|---|---|---|
| Leslie Johnson | Head | — | 35 | ~1905 |
| Donald Johnson | Son | — | 5 | ~1935 |
| Lilly Johnson | Spouse | — | 34 | ~1906 |
| Robert Johnson | Son | — | 10 | ~1930 |
Census Appearances
1920
Cook, Illinois
Son, age 15
Cook, Illinois · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leslie |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 24
Cook, Illinois · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leslie |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Filler |
| Industry | Structural Iron |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 35
Cook-County, Illinois · implied b. ~1905 — 4 household members
| Surname | Johnson |
| Given Name | Leslie |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Tinner |
| Industry | Sheet Metal Mfg |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 362 |
| Highest Grade | H 2 |
| 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 Leslie Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Johnson (~0.92 confidence) and father Lenier Johnson (~0.92 confidence) and mother Alice Johnson (~0.92 confidence) and mother Myrtle Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Johnson
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Lenier Johnson
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Alice Johnson
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Myrtle Johnson
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Leslie Johnson
Head · 1940 · age 35 · b. ~1905 · 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
40 people indexed on this census page (nara:1940:m-t0627-00997-00490)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | David Dahlfors | 54 | Head | Proprietor | Sweden |
| 42 | Regina Dahlfors | 60 | Wife | — | Sweden |
| 43 | Dorothy Dahlfors | 19 | Daughter | Waitress | Illinois |
| 44 | Theodore Dahlfors | 31 | Son | Manager | Sweden |
| 45 | Edna Dahlfors | 32 | Daughter-in-law | — | Illinois |
| 46 | Theodore Jr. Dahlfors | 3 | Grandson | — | Illinois |
| 47 | Thorleif Evensen | 38 | Head | Truck Driver | Norway |
| 48 | Bernice Evensen | 38 | Wife | Cook | Illinois |
| 49 | Lester Evensen | 15 | Son | — | Illinois |
| 50 | Clara Evensen | 67 | Mother | — | Norway |
| 51 | Charles Petersen | 63 | Lodger | Cooper | Norway |
| 52 | Edward Karsch | 42 | Head | Maintenance Man | Illinois |
| 53 | Esther Karsch | 36 | Wife | — | Norway |
| 54 | Leslie Johnson THIS PERSON | 35 | Head | Tinner | Illinois |
| 55 | Lilly Johnson | 34 | Wife | — | Illinois |
| 56 | Robert Johnson | 10 | Son | — | Illinois |
| 57 | Donald Johnson | 5 | Son | — | Illinois |
| 58 | Veronica Waibel | 41 | Head | — | Austria |
| 59 | Vera Marie Waibel | 26 | Daughter | Price Clerk | Illinois |
| 60 | Robert E. Waibel | 23 | Son | Lubricator | Illinois |
| 61 | Charles Dietrich | 55 | Brother | Waiter | Iowa |
| 62 | Valentine Wirle | 49 | Head | Joiner | Austria |
| 63 | Esther Wirle | 46 | Wife | — | Illinois |
| 64 | Walter Wirle | 25 | Son | Stock Clerk | Illinois |
| 65 | Frank Roboke | 55 | Head | Coopersmith | Illinois |
| 66 | Marion Roboke | 48 | Wife | — | Michigan |
| 67 | Virginia Roboke | 25 | Daughter | Stenographer | Illinois |
| 68 | Thomas Roboke | 23 | Son | Truck Driver | Illinois |
| 69 | Cecelia Ufson | 57 | Head | — | Sweden |
| 70 | Delbert J. Ufson | 31 | Son | Junior Clerk | Illinois |
| 71 | Virginia C. Ufson | 27 | Daughter | Sorter | Illinois |
| 72 | Jane M. Ufson | 21 | Daughter | Stenographer | Illinois |
| 73 | William Geff | 60 | Head | Painter | Illinois |
| 74 | Mabel M. Geff | 59 | Wife | — | Illinois |
| 75 | Casimir Lewandowski | 51 | Head | Carpenter | Poland |
| 76 | Antoinette Lewandowski | 45 | Wife | — | Poland |
| 77 | Helene Lewandowski | 24 | Daughter | Bookkeeping | Illinois |
| 78 | Irene Lewandowski | 19 | Daughter | — | Illinois |
| 79 | Alvin Knicker | 43 | Head | Carpenter | Illinois |
| 80 | Kate Knicker | 39 | Wife | — | Russia |
Pedigree Summary
Leslie
Gen 1 · 4 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)