JF
John Fritz — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Fritz across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 6-person household.
Age 13
b. ~1927
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Fritz |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1927 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Fritz | Head | — | 46 | ~1894 |
| Frances Fritz | Spouse | — | 40 | ~1900 |
| Edwin Fritz | Son | — | 17 | ~1923 |
| Marion Fritz | Son | — | 15 | ~1925 |
| John Fritz | Son | — | 13 | ~1927 |
| Frances Fritz | Daughter | — | 11 | ~1929 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fritz |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Italy |
| Mother's Birthplace | Colorado |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 13
Cook-County, Illinois · implied b. ~1927 — 6 household members
| Surname | Fritz |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | No 7 |
| 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 John Fritz across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Fritz
Son · 1940 · age 13 · b. ~1927 · Illinois
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Sibling
Edwin Fritz
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Fritz
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Fritz
Sibling · 1940 · age 15
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
39 people indexed on this census page (nara:1940:m-t0627-01000-00795)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Walter Kasmiski | 1 | Son | — | Illinois |
| 42 | William Broseniewski | 57 | Head | — | Poland |
| 43 | Bessie Broseniewski | 57 | Wife | — | Poland |
| 44 | Helen Rudolph | 33 | Daughter | Stenographer | New York |
| 45 | Frank Starsiak | 22 | Head | Assembler | Illinois |
| 46 | Estelle Starsiak | 20 | Wife | Truck Driver | Wisconsin |
| 47 | William Bozy | 32 | Head | Assembler | Illinois |
| 48 | Frances Bozy | 31 | Wife | Machinist | Illinois |
| 49 | Betty Ann Bozy | 5 | Daughter | — | Illinois |
| 50 | Mary Ann Bozy | 3 | Daughter | — | Illinois |
| 51 | Richard Newmark | 23 | Head | Maintenance | Illinois |
| 52 | June Newmark | 20 | Wife | — | Illinois |
| 53 | John Fritz | 46 | Head | Barber | Poland |
| 54 | Frances Fritz | 40 | Wife | — | Poland |
| 55 | Edwin Fritz | 17 | Son | Helper On Truck | Illinois |
| 56 | Marion Fritz | 15 | Son | — | Illinois |
| 57 | John Fritz THIS PERSON | 13 | Son | — | Illinois |
| 58 | Frances Fritz | 11 | Daughter | — | Illinois |
| 59 | Selma Walvig | 68 | Head | — | Sweden |
| 60 | John P. Walvig | 53 | Brother | Laborer | Sweden |
| 61 | Carl Walvig | 45 | Brother | — | Sweden |
| 62 | Jacob Thomas | 45 | Head | Woodworker | Austria |
| 63 | Elizabeth Thomas | 45 | Wife | — | Austria |
| 64 | Walter Thomas | 23 | Son | Sales Clerk | Illinois |
| 65 | Dorothy Thomas | 21 | Daughter | Typist | Illinois |
| 66 | Caroline Thomas | 20 | Daughter | Stenographer | Illinois |
| 67 | Pauline Thomas | 17 | Daughter | — | Illinois |
| 68 | Louise Kosh | 72 | Head | — | Germany |
| 69 | Catherine Barnes | 45 | Daughter | Housekeeper | Illinois |
| 70 | Cole Barnes | 45 | Son-in-law | Motorman | Iowa |
| 71 | Oliver Tigman | 32 | Head | Truck Driver | West Virginia |
| 72 | Agnes Tigman | 27 | Wife | — | Illinois |
| 73 | Joseph Tigman | 12 | Son | — | Illinois |
| 74 | Michael Mastro | 51 | Head | Contractor | Illinois |
| 75 | Gertrude Mastro | 47 | Wife | — | Illinois |
| 76 | Virginia Mastro | 25 | Daughter | Saleslady | Illinois |
| 77 | Michael Mastro | 23 | Son | Painter | Illinois |
| 78 | Harry Mastro | 21 | Son | Painter | Illinois |
| 79 | Mary Wagner | 67 | Head | — | 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)