LJ
Leo Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Fulton-County, Illinois
Our Model Tree links this Leo Johnson across the 1930 and 1940 US Censuses in Fulton-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 6-person household.
Age 19
b. ~1921
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Fulton-County, Illinois |
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | St David village |
| 1935 Residence (County) | Fulton |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | St David Village |
| Est. Birth Year | ~1921 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Leo | Age | Birth yr |
|---|---|---|---|---|
| Leo Johnson | Son | — | 19 | ~1921 |
| Oscar Johnson | Head | — | 48 | ~1892 |
| Bernard Johnson | Son | — | 22 | ~1918 |
| Bessie Johnson | Spouse | — | 42 | ~1898 |
| Inez Johnson | Daughter | — | 17 | ~1923 |
| Harold Johnson | Son | — | 23 | ~1917 |
Census Appearances
1930
Fulton, Illinois
Son, age 10
Fulton, Illinois · implied b. ~1920 — 43 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Fulton-County, Illinois
Son, age 19
Fulton-County, Illinois · implied b. ~1921 — 6 household members
| Surname | Johnson |
| Given Name | Leo |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | St David village |
| 1935 Residence (County) | Fulton |
| 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 Leo Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Leo Johnson
Son · 1940 · age 19 · b. ~1921 · Illinois
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Sibling
Bernard Johnson
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Johnson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Inez Johnson
Sibling · 1940 · age 17
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 — Fulton-County, Illinois
Open full size
1940 US Federal Census — Fulton-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00805-00121)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Dietrich | 29 | son-in-law | Car Loader | Illinois |
| 2 | Olivia Dietrich | 23 | daughter | — | Michigan |
| 3 | August Theyre | 42 | head | Shovel Oiler | Kansas |
| 4 | Martha Theyre | 36 | wife | — | Kansas |
| 5 | James Theyre | 18 | son | — | Kansas |
| 6 | Billy Joe Theyre | 6 | son | — | Kansas |
| 7 | B. B. Reed | 24 | brother-in-law | Blacksmith | Kansas |
| 8 | Jerome Simmons | 31 | head | Punching Machine | Illinois |
| 9 | Anna Simmons | 29 | wife | — | Illinois |
| 10 | Jerome Jr. Simmons | 7 | son | — | Illinois |
| 11 | Oscar Johnson | 48 | head | Coal Loader | Illinois |
| 12 | Bessie Johnson | 42 | wife | — | Illinois |
| 13 | Harold Johnson | 23 | son | Polisher | Illinois |
| 14 | Bernard Johnson | 22 | son | — | Illinois |
| 15 | Leo Johnson THIS PERSON | 19 | son | — | Illinois |
| 16 | Inez Johnson | 17 | daughter | — | Illinois |
| 17 | Tony Lepich | 36 | head | — | Missouri |
| 18 | John Lepich | 35 | brother | — | Missouri |
| 19 | Steve Nero | 25 | head | Pump Operator | Illinois |
| 20 | Frances Nero | 29 | sister | — | Illinois |
| 21 | Tom Nero | 19 | brother | — | Illinois |
| 22 | Andy Wassell | 49 | head | Stationary Fireman | Illinois |
| 23 | Ellen Wassell | 46 | wife | — | Illinois |
| 24 | Beatrice Wassell | 17 | daughter | — | Wisconsin |
| 25 | Sadie Lee Wassell | 15 | daughter | — | Illinois |
| 26 | Jim Bima | 59 | head | Coal Loader | Italy |
| 27 | Rosie Bima | 57 | wife | — | Italy |
| 28 | Willie Bima | 19 | son | New Worker | Illinois |
| 29 | Elizabeth Lotto | 54 | head | — | Italy |
| 30 | Paul Lotto | 28 | son | Planing Machine | Illinois |
| 31 | Lodi Frigolia | 48 | lodger | — | Italy |
| 32 | Mary Vitatti | 51 | head | — | Italy |
| 33 | August Rodger | 25 | lodger | — | Italy |
| 34 | Pete Manfredo | 69 | head | — | Italy |
| 35 | Charles Thilman | 31 | head | Truck Driver | Illinois |
| 36 | Millie Thilman | 29 | wife | — | Illinois |
| 37 | Betty Thilman | 11 | daughter | — | Illinois |
| 38 | Wilma Thilman | 9 | daughter | — | Illinois |
| 39 | Charles Jr. Thilman | 6 | son | — | Illinois |
Related Census Records
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)