MC
Mary Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Cassidy across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1869), then head of a 7-person household.
Age 71
b. ~1869
Female
Head
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Cassidy |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Salem City |
| Est. Birth Year | ~1869 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Veronica Mahoney | Daughter | — | 49 | ~1891 |
| Rose Stewart | Daughter | — | 50 | ~1890 |
| Mary Cassidy | Head | — | 71 | ~1869 |
| Anne Stewart | Other | — | 5 | ~1935 |
| Ruth Mahoney | Other | — | 15 | ~1925 |
| James Mahoney | Other | — | 19 | ~1921 |
| Charles Cassidy | Son | — | 35 | ~1905 |
Census Appearances
1920
Essex, Massachusetts
Head, age 51
Essex, Massachusetts · implied b. ~1869
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Cassidy |
| Given Name | Mary E |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, Massachusetts
Head, age 61
Essex, Massachusetts · implied b. ~1869 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| Age at First Marriage | 28 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 28 |
| Radio Set | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Head, age 71
Essex-County, Massachusetts · implied b. ~1869 — 7 household members
| Surname | Cassidy |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem City |
| 1935 Residence (County) | Essex |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Mary Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cassidy
Head · 1940 · age 71 · b. ~1869 · Massachusetts
★ 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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01589-00551)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary E. Cassidy THIS PERSON | 71 | Head | — | Massachusetts |
| 2 | Charles L. Cassidy | 35 | Son | Tacker | Massachusetts |
| 3 | Veronica Mahoney | 49 | Daughter | — | Massachusetts |
| 4 | James G. Mahoney | 19 | Grandson | Laborer | Massachusetts |
| 5 | Ruth F. Mahoney | 15 | Granddaughter | — | Massachusetts |
| 6 | Rose Stewart | 50 | Daughter | — | Massachusetts |
| 7 | Anne Stewart | 5 | Granddaughter | — | Massachusetts |
| 8 | Catherine E. Maguire | 65 | Head | Taping & Tieing | Massachusetts |
| 9 | William M. Cronin | 56 | Head | Buffer | Massachusetts |
| 10 | Louise E. Cronin | 50 | Wife | — | Massachusetts |
| 11 | Joseph H. Cronin | 22 | Son | Tacker | Massachusetts |
| 12 | "Lawrence ""A""" Cronin | 21 | Son | Reforestation | Massachusetts |
| 13 | William Cronin | 15 | Son | — | Massachusetts |
| 14 | Anthony Cronin | 13 | Son | — | Massachusetts |
| 15 | James Cronin | 10 | Son | — | Massachusetts |
| 16 | Henry Cronin | 7 | Son | — | Massachusetts |
| 17 | Clara B. Scofield | 30 | Head | Housework | Massachusetts |
| 18 | Alfred Ouellette | 40 | Head | Laborer | Massachusetts |
| 19 | Elizabeth B. Ouellette | 41 | Wife | — | Massachusetts |
| 20 | Alice Ouellette | 19 | Daughter | Seamstress | Massachusetts |
| 21 | Cecelia Ouellette | 16 | Daughter | — | Massachusetts |
| 22 | Jean Ouellette | 15 | Daughter | — | Massachusetts |
| 23 | Joseph Ouellette | 13 | Son | — | Massachusetts |
| 24 | Alfred Ouellette | 12 | Son | — | Massachusetts |
| 25 | Marie Ouellette | 10 | Daughter | — | Massachusetts |
| 26 | Robert Ouellette | 8 | Son | — | Massachusetts |
| 27 | Paul Ouellette | 2 | Son | — | Massachusetts |
| 28 | Mary E. Lynch | 70 | Head | — | Massachusetts |
| 29 | Frances Lynch | 40 | Boarder | Salesman | Massachusetts |
| 30 | Nora Riley | 52 | Head | Ironer | Eire |
| 31 | Margaret Riley | 25 | Daughter | Clerk | Massachusetts |
| 32 | Anna Zander | 45 | Head | — | New Hampshire |
| 33 | William Zander | 16 | Son | — | Massachusetts |
| 34 | Rita Zander | 13 | Daughter | — | Massachusetts |
| 35 | Edward L. Denault | 63 | Head | Barker | Canada French |
| 36 | Celene Denault | 64 | Wife | — | Canada French |
| 37 | Patrick O'Brien | 73 | Head | — | Massachusetts |
| 38 | Laura O'Brien | 55 | Wife | — | Canada French |
| 39 | Catharine O'Brien | 20 | Daughter | Bookkeeper | Massachusetts |
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)