LJ
Leo Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Leo Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1899), then head of a 4-person household.
Age 41
b. ~1899
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Mason contractor |
| Industry | E |
| Class of Worker | 0 |
| Hours Worked | 40 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Mason Contractor |
| Township / Ward | Chicago |
| Est. Birth Year | ~1899 |
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 Leo | Age | Birth yr |
|---|---|---|---|---|
| Leo Johnson | Head | — | 41 | ~1899 |
| Arlis Johnson | Daughter | — | 10 | ~1930 |
| Norman Johnson | Son | — | 14 | ~1926 |
| Ann Johnson | Spouse | — | 40 | ~1900 |
Census Appearances
1920
Cook, Illinois
Other, age 21
Cook, Illinois · implied b. ~1899 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Sweden |
| Year of Immigration | 1917 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Machinist |
| Industry | Screw Machine Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1930
Cook, Illinois
Head, age 31
Cook, Illinois · implied b. ~1899
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1917 |
| Age at First Marriage | 26 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Contractor |
| Industry | Carpenter |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | R |
| Home Value / Rent | 50.00 |
| Veteran | No |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Cook-County, Illinois
Head, age 41
Cook-County, Illinois · implied b. ~1899 — 4 household members
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Mason contractor |
| Industry | E |
| Class of Worker | 0 |
| Hours Worked | 40 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
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 Leo Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Leo Johnson
Head · 1940 · age 41 · b. ~1899 · 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-t0627-01003-00956)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Wife Rundil | None | F | — | — |
| 42 | Fred Kaufman | 73 | Head | — | Germany |
| 43 | Mary Kaufman | 67 | Wife | — | Wisconsin |
| 44 | Herbert Trost | 29 | Step son | Truck Driver | Illinois |
| 45 | Elmer Trost | 38 | Step son | Truck Driver | Illinois |
| 46 | Carl G. Dahlgren | 53 | Head | Tool And Die Maker | Sweden |
| 47 | Mary Dahlgren | 48 | Wife | — | Sweden |
| 48 | Bror Erickson | 47 | Boarder | Machinist | Sweden |
| 49 | Antoinette Ginnig | 64 | Head | — | Germany |
| 50 | Carl Ginnig | 28 | Son | Laborer | Illinois |
| 51 | Ferdinand Vangness | 52 | Head | Traveling Salesman | Minnesota |
| 52 | Laura Vangness | 50 | Wife | — | Minnesota |
| 53 | Olga Eckel | 53 | Head | Owner | Germany |
| 54 | Carl Eckel | 26 | Son | Salesman | Illinois |
| 55 | Marion Eckel | 24 | Daughter | — | Illinois |
| 56 | Emilie Eckel | 24 | Daughter | Secretary | Illinois |
| 57 | George Arendt | 45 | Head | Pressman | Illinois |
| 58 | Frances Arendt | 42 | Wife | — | Illinois |
| 59 | Geraldine Arendt | 17 | Daughter | New Worker | Illinois |
| 60 | Jerome Arendt | 15 | Son | — | Illinois |
| 61 | Gregory Arendt | 11 | Son | — | Illinois |
| 62 | Hulda Cooksey | 52 | Head | — | Illinois |
| 63 | Arvilla Cooksey | 20 | Daughter | — | Illinois |
| 64 | Grace Cooper | 35 | Boarder | Saleswoman | Macoupin Co. Ill |
| 65 | George Holz | 45 | Head | Proprietor | Illinois |
| 66 | Edna Holz | 43 | Wife | — | Illinois |
| 67 | Leo Johnson THIS PERSON | 41 | Head | Mason Contractor | Sweden |
| 68 | Ann M. Johnson | 40 | Wife | — | Massachusetts |
| 69 | Norman Johnson | 14 | Son | — | Illinois |
| 70 | Arlis Johnson | 10 | Daughter | — | Illinois |
| 71 | Edward Jaques | 48 | Head | — | Illinois |
| 72 | Katherine Jaques | 49 | Wife | — | Illinois |
| 73 | Lillie Jaques | 21 | Daughter | General Helper | Illinois |
| 74 | James Gillespie | 60 | Head | Machinist | Pennsylvania |
| 75 | Carrie L. Gillespie | 62 | Wife | — | Virginia |
| 76 | Henry Kania | 35 | Head | Postal Clerk | Illinois |
| 77 | Regina Kania | 29 | Wife | — | Illinois |
| 78 | Calvin Kania | 5 | Son | — | Illinois |
| 79 | Mary Ann Kania | 2 | Daughter | — | Illinois |
| 80 | Fred L. Schultz | 54 | Head | Fireman | 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)