JN
John Novak — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Novak across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 14-person household.
Age 17
b. ~1923
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | NOVAK |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO |
| 1935 Residence (County) | COOK |
| Additional Details | |
| Industry | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1923 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Pragit | Head | — | 50 | ~1890 |
| Elmer Novak | Son | — | 20 | ~1920 |
| William Novak | Son | — | 24 | ~1916 |
| James Pragit | Son | — | 17 | ~1923 |
| Stephanie Janik | Other | — | 30 | ~1910 |
| Michael Pragit | Son | — | 27 | ~1913 |
| Catherine Novak | Daughter | — | 26 | ~1914 |
| Helen Pragit | Daughter | — | 18 | ~1922 |
| William Pragit | Son | — | 13 | ~1927 |
| Marie Pragit | Daughter | — | 20 | ~1920 |
| Frank Pragit | Son | — | 16 | ~1924 |
| John Novak | Son | — | 17 | ~1923 |
| Stephen Janik | Other | — | 32 | ~1908 |
| Lillian Novak | Daughter | — | 14 | ~1926 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Novak |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 17
Cook-County, Illinois · implied b. ~1923 — 14 household members
| Surname | NOVAK |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO |
| 1935 Residence (County) | COOK |
| Industry | 0 |
| Highest Grade | H 4 |
| 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 John Novak across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Novak
Son · 1940 · age 17 · b. ~1923 · Illinois
★ You are viewing this record
Sibling
William Pragit
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Pragit
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Novak
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Novak
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Pragit
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Novak
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Pragit
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Pragit
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Pragit
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elmer Novak
Sibling · 1940 · age 20
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 — 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-t0627-00952-00906)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Swiercz | 29 | Head | Butcher | Illinois |
| 2 | Genevieve Swiercz | 22 | Wife | — | Illinois |
| 3 | Ronald Swiercz | 5 | Son | — | Illinois |
| 4 | Camille Swiercz | 2 | Daughter | — | Illinois |
| 5 | Stanley Swiercz | 24 | Head | Laborer | Indiana |
| 6 | Dolores Swiercz | 22 | Wife | — | Illinois |
| 7 | Stanley Jr. Swiercz | 4 | Son | — | Illinois |
| 8 | Darlene Swiercz | 2 | Daughter | — | Illinois |
| 9 | Ronald Swiercz | 1 | Son | — | Illinois |
| 10 | John Pragit | 50 | Head | Car Inspector | Czechoslovakia |
| 11 | Michael Pragit | 27 | Son | Checker | Illinois |
| 12 | Marie Pragit | 20 | Daughter | — | Illinois |
| 13 | Helen Pragit | 18 | Daughter | Packer | Illinois |
| 14 | James Pragit | 17 | Son | — | Illinois |
| 15 | Frank Pragit | 16 | Son | — | Illinois |
| 16 | William Pragit | 13 | Son | — | Illinois |
| 17 | Catherine Novak | 26 | Daughter | Packer | Illinois |
| 18 | William Novak | 24 | Son | Stenographer | Illinois |
| 19 | Elmer Novak | 20 | Son | New Worker | Illinois |
| 20 | John Novak THIS PERSON | 17 | Son | — | Illinois |
| 21 | Lillian Novak | 14 | Daughter | — | Illinois |
| 22 | Stephen Janik | 32 | Brother-in-law | Clerk | Illinois |
| 23 | Stephanie Janik | 30 | Sister | Secretary | Illinois |
| 24 | Michael Vrnis | 45 | Head | Trucker | Czechoslovakia |
| 25 | Susan Vrnis | 45 | Wife | Packer | Czechoslovakia |
| 26 | John Vrnis | 24 | Son | Bottle Washer | Illinois |
| 27 | Joseph Konzen | 45 | Head | Sr. Timekeeper | Illinois |
| 28 | Dorothy Konzen | 37 | Wife | — | Illinois |
| 29 | Joseph Jr. Konzen | 18 | Son | New Worker | Illinois |
| 30 | Dorothy Konzen | 16 | Daughter | — | Illinois |
| 31 | Thomas Konzen | 11 | Son | — | Illinois |
| 32 | Dolores Konzen | 8 | Daughter | — | Illinois |
| 33 | Andrew Milka | 65 | Head | Carpenter | Poland |
| 34 | Julia Milka | 62 | Wife | — | Poland |
| 35 | Edmund Milka | 29 | Son | Truck Driver | Illinois |
| 36 | Leonard Milka | 19 | Son | Laborer | Illinois |
| 37 | John Stancik | 44 | Head | Night Watchman | Czechoslovakia |
| 38 | Catherine Stancik | 37 | Wife | — | Illinois |
| 39 | Edwin Stancik | 16 | Son | — | Illinois |
| 40 | Robert Stancik | 14 | Son | — | 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)