WT
William Tracy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Tracy across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Tracy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Laborer |
| Industry | Printing Co |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 600 |
| Highest Grade | 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1925 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| John Tracy | Head | — | 65 | ~1875 |
| Margaret Tracy | Spouse | — | 62 | ~1878 |
| Evelyn Tracy | Daughter | — | 21 | ~1919 |
| James Tracy | Son | — | 27 | ~1913 |
| William Tracy | Son | — | 15 | ~1925 |
| John Tracy | Son | — | 29 | ~1911 |
| Charmaine Sheehan | Other | — | 6 | ~1934 |
Census Appearances
1930
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1924 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Tracey |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Canada Eng |
| Mother's Birthplace | Canada Eng |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 15
Cook-County, Illinois · implied b. ~1925 — 7 household members
| Surname | Tracy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Laborer |
| Industry | Printing Co |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 600 |
| Highest Grade | 8 |
| 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 William Tracy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Tracy
Son · 1940 · age 15 · b. ~1925 · Illinois
★ You are viewing this record
Sibling
John Tracy
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Tracy
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Tracy
Sibling · 1940 · age 21
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-t0627-00938-00871)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Geary | 19 | Son | Inventory Clerk | Illinois |
| 42 | Rose M Geary | 14 | Daughter | — | Illinois |
| 43 | Daniel Geary | 8 | Son | — | Illinois |
| 44 | Joseph Passi | 47 | Head | Barber | Italy |
| 45 | Edith Passi | 41 | Wife | — | Italy |
| 46 | Teresa Passi | 15 | Daughter | — | Illinois |
| 47 | Paul Passi | 12 | Son | — | Illinois |
| 48 | Angelo Lenoci | 18 | Nephew | New Worker | Illinois |
| 49 | Grace Taglieri | 75 | Mother-in-law | — | Italy |
| 50 | John Olshaki | 50 | Head | Truck Driver | Poland |
| 51 | Agnes Olshaki | 34 | Wife | — | Pennsylvania |
| 52 | Robert Olshaki | 12 | Son | — | Illinois |
| 53 | Beverly Olshaki | 7 | Daughter | — | Illinois |
| 54 | James Monfaias | 44 | Head | Assembler | Illinois |
| 55 | Hazel Monfaias | 42 | Wife | Switchboard Operator | Illinois |
| 56 | John Tracy | 65 | Head | — | Illinois |
| 57 | Margaret Tracy | 62 | Wife | — | Illinois |
| 58 | John Jr Tracy | 29 | Son | Truck Driver | Illinois |
| 59 | James Tracy | 27 | Son | Truck Driver | Illinois |
| 60 | Evelyn Tracy | 21 | Daughter | Packer | Illinois |
| 61 | William Tracy THIS PERSON | 15 | Son | Laborer | Illinois |
| 62 | Charmaine Sheehan | 6 | Granddaughter | — | Illinois |
| 63 | Emmett Gross | 22 | Head | Truck Driver | Illinois |
| 64 | Mary J Gross | 22 | Wife | — | Illinois |
| 65 | Frank De Poy | 42 | Head | Electrical Operator | Ohio |
| 66 | Ethel De Poy | 39 | Wife | — | Illinois |
| 67 | Eleanor De Poy | 17 | Daughter | — | Illinois |
| 68 | Iris De Poy | 11 | Daughter | — | Illinois |
| 69 | Mary Barnes | 63 | Head | — | Illinois |
| 70 | William Barnes | 34 | Son | Fireman | Illinois |
| 71 | George Barnes | 21 | Son | — | Illinois |
| 72 | Lena Houth | 73 | Aunt | — | Illinois |
| 73 | Hubert Brennan | 43 | Head | Conductor | Eire |
| 74 | Nora Brennan | 36 | Wife | — | Eire |
| 75 | Joseph Brennan | 13 | Son | — | Illinois |
| 76 | Leo J Brennan | 11 | Son | — | Illinois |
| 77 | Mary E Brennan | 7 | Daughter | — | Illinois |
| 78 | John P Brennan | 2 | Son | — | Illinois |
| 79 | William Bogner | 68 | Head | Watchman | Germany |
| 80 | Bertha Bogner | 65 | Wife | — | Germany |
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)