WC
William Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Cassidy across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 4-person household.
Age 68
b. ~1872
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Cassidy |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Operating Engineer |
| Industry | City of Chicago |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 2420 |
| Highest Grade | No 5 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Operating Engineer |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1872 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Cassidy | Head | — | 68 | ~1872 |
| John Galvin | Son | — | 18 | ~1922 |
| Anne Goldsmith | Other | — | 72 | ~1868 |
| Margaret Cassidy | Spouse | — | 68 | ~1872 |
Census Appearances
1920
Cook, Illinois
Head, age 47
Cook, Illinois · implied b. ~1873 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Engineer |
| Industry | City of Chicago |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Head, age 57
Cook, Illinois · implied b. ~1873 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 21 |
| Father's Birthplace | No. Ireland |
| Mother's Birthplace | No. Ireland |
| Occupation | Engineer Sta |
| Industry | City of Chgo |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Home Value / Rent | R |
| Radio Set | 65.00 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 68
Cook-County, Illinois · implied b. ~1872 — 4 household members
| Surname | Cassidy |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Operating Engineer |
| Industry | City of Chicago |
| Class of Worker | GW |
| Hours Worked | 56 |
| Income (1939) | 2420 |
| Highest Grade | No 5 |
| 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 William Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Cassidy
Head · 1940 · age 68 · b. ~1872 · Illinois
★ You are viewing this record
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-t0627-00958-00224)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Berry | 38 | Head | Office Clerk | Illinois |
| 2 | Marie Berry | 35 | Wife | Clerk | Illinois |
| 3 | Gustav Pulaski | 76 | Head | Street Car Conductor | Indiana |
| 4 | Katherine Warrance | 46 | Daughter | — | Illinois |
| 5 | Dorothy Warrance | 15 | Granddaughter | — | Illinois |
| 6 | John Pulaski | 49 | Head | Office Manager | Illinois |
| 7 | Nettie Pulaski | 41 | Wife | — | Illinois |
| 8 | Valerie Pulaski | 10 | Daughter | — | Illinois |
| 9 | Jennie Heintz | 68 | Mother-in-law | — | Missouri |
| 10 | Timothy Hunt | 72 | Head | Motorman | Irish Free State |
| 11 | Catherine Hunt | 64 | Wife | — | Irish Free State |
| 12 | Mary Dower | 47 | Daughter | — | Illinois |
| 13 | William H. Cassidy THIS PERSON | 68 | Head | Operating Engineer | Illinois |
| 14 | Margaret Cassidy | 68 | Wife | — | Illinois |
| 15 | Anne Goldsmith | 72 | Sister-in-law | — | Illinois |
| 16 | John J. Galvin | 18 | Son | — | Illinois |
| 17 | Mary Fitzgerald | 54 | Head | Cafeteria Manager | Illinois |
| 18 | June Fitzgerald | 21 | Daughter | Typist | Illinois |
| 19 | Evelyn Crotty | 33 | Daughter | Typist Clerk | Illinois |
| 20 | Marilyn Crotty | 6 | Daughter | — | Illinois |
| 21 | Lenore Nolan | 31 | Daughter | — | Illinois |
| 22 | John Nolan | 35 | Son-in-law | Office Clerk | Illinois |
| 23 | Albert Lewis | 55 | Head | Brick Salesman | Illinois |
| 24 | Pauline Lewis | 46 | Wife | — | Illinois |
| 25 | Helen E. Lewis | 15 | Daughter | — | Illinois |
| 26 | Sarah Slayton | 74 | Mother-in-law | — | Illinois |
| 27 | John G. Gruhl | 55 | Head | Bookkeeper | Michigan |
| 28 | Ida Gruhl | 57 | Wife | — | Michigan |
| 29 | Dorothy A. Gruhl | 19 | Daughter | — | Illinois |
| 30 | Arthur Haenstrom | 49 | Head | Salesman Bookkeeper | Illinois |
| 31 | Frida Haenstrom | 48 | Wife | Clerical | Illinois |
| 32 | Arthur Jr. Haenstrom | 21 | Son | Reporter | Illinois |
| 33 | Leila Haenstrom | 13 | Daughter | — | Illinois |
| 34 | Leon Timm | 40 | Brother-in-law | Salesman | Indiana |
| 35 | Elvera Timm | 35 | Sister-in-law | Hair Dresser | Illinois |
| 36 | Ellis Bean | 56 | Head | Watch Maker | Sweden |
| 37 | Gerta Bean | 52 | Wife | — | Sweden |
| 38 | Janet L. Bean | 23 | Daughter | Works Office In Laundry | Illinois |
| 39 | Jerome Bean | 17 | Son | — | Illinois |
| 40 | Lawrence Olson | 49 | Head | Government Inspector | 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)