WC
William Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this William Cassidy across the 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 12-person household.
Age 16
b. ~1924
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Cassidy |
| Given Name | William M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Brooklyn |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Township / Ward | Brooklyn |
| Est. Birth Year | ~1924 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| George Cassidy | Son | — | 26 | ~1914 |
| William Cassidy | Son | — | 16 | ~1924 |
| Mary Cassidy | Daughter | — | 21 | ~1919 |
| Alice Cassidy | Daughter | — | 18 | ~1922 |
| Charles Coyle | Son | — | 17 | ~1923 |
| John Cassidy | Son | — | 27 | ~1913 |
| Elizabeth Coyle | Spouse | — | 57 | ~1883 |
| Joseph Cassidy | Son | — | 20 | ~1920 |
| Charles Coyle | Head | — | 67 | ~1873 |
| Robert Cassidy | Son | — | 24 | ~1916 |
| Rose Coyle | Daughter | — | 25 | ~1915 |
| Rita Coyle | Daughter | — | 26 | ~1914 |
Census Appearances
1930
Kings, New …
Other, age 5
Kings, New York · implied b. ~1925 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | William |
| Relationship to Head | Nephew |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 16
Kings-County, New York · implied b. ~1924 — 12 household members
| Surname | Cassidy |
| Given Name | William M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Brooklyn |
| 1935 Residence (County) | Kings |
| Highest Grade | Hs 1 |
| 1935 Residence | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Cassidy
Son · 1940 · age 16 · b. ~1924 · New York
★ You are viewing this record
Sibling
Mary Cassidy
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Coyle
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cassidy
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cassidy
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Cassidy
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Coyle
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Cassidy
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cassidy
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Coyle
Sibling · 1940 · age 25
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02571-00482)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Annie Jones | 80 | Head | Pension | Staten Island |
| 2 | William A Jones | 61 | Brother | Painter | New York |
| 3 | Gabriel Tharaldsen | 35 | Head | Dock Builder | Norway |
| 4 | Ingeborg Tharaldsen | 33 | Wife | — | Norway |
| 5 | Marian Tharaldsen | 5 | Daughter | — | New York |
| 6 | Howard C. Moller | 30 | Head | Holder-On | New York |
| 7 | Arlene Moller | 29 | Wife | Salesgirl | New York |
| 8 | Adolph Merz | 47 | Head | Salesman | Brooklyn N.Y. |
| 9 | Anna Merz | 37 | Wife | — | Ireland |
| 10 | Floyd Johansen | 16 | Stepson | — | Brooklyn N.Y. |
| 11 | August Resnek | 40 | Lodger | Painter | Latvia |
| 12 | Maria Capellio | 72 | Head | — | Italy |
| 13 | Cornelia Dalessandro | 51 | Daughter | Flower Maker | New York |
| 14 | George Capellio | 49 | Head | Supervisor | Staten Island |
| 15 | Ida Capellio | 40 | Wife | — | Italy |
| 16 | Georgia Capellio | 5 | Daughter | — | New York |
| 17 | Annie Malloy | 76 | Head | — | Scotland |
| 18 | Florence Malloy | 40 | Daughter | Supervisor | New York |
| 19 | Richard Buchanan | 50 | Head | Highway | Virginia |
| 20 | Gladys Buchanan | 50 | Wife | — | Virginia |
| 21 | Richard Buchanan | 26 | Son | Marine Clerk | New York |
| 22 | Audry Buchanan | 22 | Daughter | Bookkeeper | Virginia |
| 23 | Burwell Buchanan | 20 | Son | — | Virginia |
| 24 | Niles Anderson | 45 | Head | Painter | Sweden |
| 25 | Arthur Anderson | 20 | Son | — | Sweden |
| 26 | Greta Anderson | 17 | Daughter | — | Sweden |
| 27 | Ruth Anderson | 11 | Daughter | — | New York |
| 28 | Martha Anderson | 9 | Daughter | — | New York |
| 29 | Charles Coyle | 67 | Head | Clerk | Ireland |
| 30 | Elizabeth Coyle | 57 | Wife | — | Pennsylvania |
| 31 | Rita Coyle | 26 | Daughter | Key Puncher | New York |
| 32 | Rose Coyle | 25 | Daughter | Key Puncher | New York |
| 33 | Charles Coyle | 17 | Son | — | New York |
| 34 | John F. Jr. Cassidy | 27 | Son | Plumber | New York |
| 35 | George Cassidy | 26 | Son | Clerk | New York |
| 36 | Robert J. Cassidy | 24 | Son | Clerk | New York |
| 37 | Mary F. Cassidy | 21 | Daughter | Secretary | New York |
| 38 | Joseph P. Cassidy | 20 | Son | — | New York |
| 39 | Alice M. Cassidy | 18 | Daughter | Sales Clerk | New York |
| 40 | William M Cassidy THIS PERSON | 16 | Son | — | New York |
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)