WC
William Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Cassidy across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1904), then head of a 10-person household.
Age 36
b. ~1904
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Cassidy |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Sailmaker |
| Industry | Navy Yard |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2200 |
| Highest Grade | Hs 2 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Sailmaker |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1904 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cummings | Daughter | — | 26 | ~1914 |
| Carol Cummings | Daughter | — | 4 | ~1936 |
| Agnes Porter | Daughter | — | 27 | ~1913 |
| Constance Cummings | Daughter | — | 4 | ~1936 |
| William Cassidy | Son | — | 2 | ~1938 |
| Frederick Cummings | Other | — | 30 | ~1910 |
| William Cassidy | Head | — | 36 | ~1904 |
| Thomas Porter | Other | — | 37 | ~1903 |
| Josephine Dwyer | Other | — | 36 | ~1904 |
| Agnes Cassidy | Spouse | — | 33 | ~1907 |
Census Appearances
1930
Middlesex, Massachusetts
Head, age 24
Middlesex, Massachusetts · implied b. ~1906 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 22 |
| Father's Birthplace | Rhode Island |
| Mother's Birthplace | Massachusetts |
| Occupation | Salesman |
| Industry | Private family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | 45 |
| Veteran | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 36
Middlesex-County, Massachusetts · implied b. ~1904 — 10 household members
| Surname | Cassidy |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea |
| 1935 Residence (County) | Suffolk |
| Occupation | Sailmaker |
| Industry | Navy Yard |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2200 |
| Highest Grade | Hs 2 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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.
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This person
Anchor record
William Cassidy
Head · 1940 · age 36 · b. ~1904 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01705-00484)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Daniel J. O'Connell | 36 | Head | Police Officer | Massachusetts |
| 42 | Catherine E. O'Connell | 35 | Wife | — | Massachusetts |
| 43 | William J. Cassidy THIS PERSON | 36 | Head | Sailmaker | Massachusetts |
| 44 | Agnes U. Cassidy | 33 | Wife | — | Massachusetts |
| 45 | William P. Cassidy | 2 | Son | — | Massachusetts |
| 46 | Thomas Porter | 37 | Son-in-law | Special Clerk | Massachusetts |
| 47 | Agnes Porter | 27 | Daughter | Meter | Massachusetts |
| 48 | Frederick R. Cummings | 30 | Son-in-law | Stenographer | Massachusetts |
| 49 | Margaret M. Cummings | 26 | Daughter | Clerk | Massachusetts |
| 50 | Carol Cummings | 4 | Daughter | — | Massachusetts |
| 51 | Constance Cummings | 4 | Daughter | — | Massachusetts |
| 52 | Josephine G. Dwyer | 36 | Sister-in-law | Sewing | Massachusetts |
| 53 | Marion F. Crane | 52 | Head | Bookkeeper | Massachusetts |
| 54 | Eva C. Crane | 89 | Mother | — | Massachusetts |
| 55 | Edith J. Crane | 64 | Sister | — | Massachusetts |
| 56 | Ralph Crane | 44 | Brother | Foreman | Massachusetts |
| 57 | Lettie M. Hamston | 69 | Sister | Elem School Teacher | Massachusetts |
| 58 | Lillian E. Merrill | 63 | Head | — | Massachusetts |
| 59 | Arline Merrill | 22 | Daughter | English Teacher | Massachusetts |
| 60 | Ella Rouse | 63 | Head | Collector | Massachusetts |
| 61 | B. St. Charles | 60 | Head | Superintendent | Canada English |
| 62 | Frances B. St. Charles | 58 | Wife | Clerk | Maine |
| 63 | Adolphus S. Grecco | 39 | Head | Collector | Massachusetts |
| 64 | Adeline Grecco | 38 | Wife | Checker | Massachusetts |
| 65 | William A. Gaudreau | 35 | Head | Chauffeur | Massachusetts |
| 66 | Mary A. Gaudreau | 37 | Wife | — | Massachusetts |
| 67 | William John E. Gaudreau | 2 | Son | — | Massachusetts |
| 68 | Mary C. Mack | 17 | Niece | — | Massachusetts |
| 69 | Robert W. Wilson | 49 | Head | Provision Salesman | Massachusetts |
| 70 | Caroline S. Wilson | 48 | Wife | — | Massachusetts |
| 71 | William J. Mainey | 55 | Brother-in-law | Sheet Metal Worker | Massachusetts |
| 72 | Cecile M. Mayo | 41 | Head | Dressmaker | France |
| 73 | Paul H. Mayo | 20 | Son | — | Massachusetts |
| 74 | Anthony Sarmardino | 56 | Lodger | Musician | Italy |
| 75 | Daniel M. Forrest | 37 | Head | Book Binder | Massachusetts |
| 76 | Gladys Forrest | 36 | Wife | — | Massachusetts |
| 77 | Gail Forrest | 5 | Daughter | — | Massachusetts |
| 78 | Chauncey H. Carle | 41 | Father-in-law | Ticket Taker | Massachusetts |
| 79 | Harold T. Brinton | 54 | Head | Mechanical Engineer | Rhode Island |
| 80 | Rebecca S. Brinton | 54 | Wife | — | Canada English |
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)