JS
Jack Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Knox-County, Illinois
Our Model Tree links this Jack Smith across the 1930 and 1940 US Censuses in Knox-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 13-person household.
Age 19
b. ~1921
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Illinois |
| Surname | Smith |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Galesburg City |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Occupation | Laborer |
| Industry | Soil Erosion |
| Class of Worker | GW |
| Hours Worked | 2 |
| Income (1939) | 360 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Galesburg City |
| 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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Joyce Smith | Daughter | — | 3 | ~1937 |
| Dorothy Smith | Daughter | — | 13 | ~1927 |
| Patricia Smith | Daughter | — | 2 | ~1938 |
| Mary Smith | Daughter | — | 15 | ~1925 |
| Fay Smith | Head | — | 41 | ~1899 |
| Leo Berry | Other | — | 32 | ~1908 |
| Jack Smith | Son | — | 19 | ~1921 |
| William Smith | Son | — | 7 | ~1933 |
| Richard Smith | Son | — | 12 | ~1928 |
| Wayne Smith | Son | — | 4 | ~1936 |
| Robert Smith | Son | — | 10 | ~1930 |
| James Smith | Son | — | 13 | ~1927 |
| Flora Smith | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Knox, Illinois
Son, age 10
Knox, Illinois · implied b. ~1920 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Knox-County, Illinois
Son, age 19
Knox-County, Illinois · implied b. ~1921 — 13 household members
| Surname | Smith |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Galesburg City |
| 1935 Residence (County) | Knox |
| Occupation | Laborer |
| Industry | Soil Erosion |
| Class of Worker | GW |
| Hours Worked | 2 |
| Income (1939) | 360 |
| Highest Grade | No 8 |
| 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 Jack Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Smith
Son · 1940 · age 19 · b. ~1921 · Illinois
★ You are viewing this record
Sibling
James Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Smith
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wayne Smith
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Smith
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Smith
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Smith
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Smith
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joyce Smith
Sibling · 1940 · age 3
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 — Knox-County, Illinois
Open full size
1940 US Federal Census — Knox-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00826-00727)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Theodore Swigart | 12 | Son | — | Illinois |
| 42 | Barbara Swigart | 11 | Daughter | — | Illinois |
| 43 | Carl Swigart | 9 | Son | — | Illinois |
| 44 | Grace Swigart | 6 | Daughter | — | Illinois |
| 45 | Clarence R. Sharpe | 57 | Head | Locomotive Dispatcher | Illinois |
| 46 | Ednah E. Sharpe | 48 | Wife | — | Illinois |
| 47 | James E. Ross | 67 | Head | — | Illinois |
| 48 | Bessie E. Ross | 65 | Wife | — | Illinois |
| 49 | Zephra C. Ross | 30 | Daughter | Operator | Illinois |
| 50 | Leo Carlson | 28 | Head | Sander | Illinois |
| 51 | Irao Carlson | 30 | Wife | — | Missouri |
| 52 | Jerry Carlson | 3 | Son | — | Illinois |
| 53 | William Anderson | 39 | Head | Car Repair Man | Illinois |
| 54 | Mary Anderson | 32 | Wife | — | Illinois |
| 55 | Frances Anderson | 63 | Mother | Maid | Illinois |
| 56 | Eva Anderson | 35 | Sister | Garment Worker | Illinois |
| 57 | Floyd Chrisman | 38 | Lodger | Truck Maintainer | Missouri |
| 58 | Fay Smith | 41 | Head | Truck Driver | Illinois |
| 59 | Flora Smith | 39 | Wife | — | Illinois |
| 60 | Jack Smith THIS PERSON | 19 | Son | Laborer | Illinois |
| 61 | Mary Smith | 15 | Daughter | New Worker | Illinois |
| 62 | James Smith | 13 | Son | — | Illinois |
| 63 | Dorothy Smith | 13 | Daughter | — | Illinois |
| 64 | Richard Smith | 12 | Son | — | Illinois |
| 65 | Robert Smith | 10 | Son | — | Illinois |
| 66 | William Smith | 7 | Son | — | Illinois |
| 67 | Wayne Smith | 4 | Son | — | Illinois |
| 68 | Joyce Smith | 3 | Daughter | — | Illinois |
| 69 | Patricia Smith | 2 | Daughter | — | Illinois |
| 70 | Leo Berry | 32 | Lodger | Truck Driver | Virginia |
| 71 | Macy Wilkins | 28 | Head | Laborer | Iowa |
| 72 | Ida A. Wilkins | 34 | Wife | — | Missouri |
| 73 | Louisa Wilkins | 16 | Daughter | — | Illinois |
| 74 | Shirley M. Wilkins | 7 | Daughter | — | Illinois |
| 75 | Harold Wilkins | 5 | Son | — | Illinois |
| 76 | Dorothy Wilkins | 4 | Daughter | — | Illinois |
| 77 | Gordon Auck | 16 | Lodger | New Worker | Illinois |
| 78 | Dave Blest | 52 | Head | Kettle Man | Sweden |
| 79 | Mabel Blest | 51 | Wife | — | Illinois |
| 80 | Walter Blest | 28 | Son | — | — |
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)