MC
Mary Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Cassidy across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 12-person household.
Age 17
b. ~1923
Female
Daughter
Born: SCOTLAND
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | CASSIDY |
| Given Name | MARY |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | SCOTLAND |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Additional Details | |
| Industry | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1923 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Cassidy | Daughter | — | 42 | ~1898 |
| Rose Cassidy | Daughter | — | 10 | ~1930 |
| Mary Cassidy | Daughter | — | 17 | ~1923 |
| Margaret Cassidy | Daughter | — | 9 | ~1931 |
| Catherine Cassidy | Daughter | — | 12 | ~1928 |
| Felix Cassidy | Head | — | 55 | ~1885 |
| James Cassidy | Son | — | 7 | ~1933 |
| John Cassidy | Son | — | 11 | ~1929 |
| Felix Cassidy | Son | — | 16 | ~1924 |
| Henry Cassidy | Son | — | 15 | ~1925 |
| Arthur Cassidy | Son | — | 6 | ~1934 |
| Patrick Cassidy | Son | — | 20 | ~1920 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 7
Philadelphia, Pennsylvania · implied b. ~1923 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Alien |
| Year of Immigration | 1928 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Philadelphia-County, Pennsylvania
Daughter, age 17
Philadelphia-County, Pennsylvania · implied b. ~1923 — 12 household members
| Surname | CASSIDY |
| Given Name | MARY |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | SCOTLAND |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Industry | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cassidy
Daughter · 1940 · age 17 · b. ~1923 · Pennsylvania
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Sibling
Patrick Cassidy
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cassidy
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Cassidy
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cassidy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cassidy
Sibling · 1940 · age 42
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Felix Cassidy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cassidy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Cassidy
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Cassidy
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cassidy
Sibling · 1940 · age 7
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-03737-00033)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Felix Cassidy | 55 | HEAD | Fireman | NORTHERN IRELAND |
| 42 | Catherine Cassidy | 42 | DAUGHTER | — | NORTHERN IRELAND |
| 43 | Patrick Cassidy | 20 | SON | Dispatcher | NORTHERN IRELAND |
| 44 | Mary Cassidy THIS PERSON | 17 | DAUGHTER | — | SCOTLAND |
| 45 | Felix Cassidy | 16 | SON | — | SCOTLAND |
| 46 | Henry Cassidy | 15 | SON | — | SCOTLAND |
| 47 | Catherine Cassidy | 12 | DAUGHTER | — | SCOTLAND |
| 48 | John Cassidy | 11 | SON | — | SCOTLAND |
| 49 | Rose Cassidy | 10 | DAUGHTER | — | PENNSYLVANIA |
| 50 | Margaret Cassidy | 9 | DAUGHTER | — | PENNSYLVANIA |
| 51 | James Cassidy | 7 | SON | — | PENNSYLVANIA |
| 52 | Arthur Cassidy | 6 | SON | — | PENNSYLVANIA |
| 55 | William Rahner | 41 | HEAD | Musician | PENNSYLVANIA |
| 56 | Irene Rahner | 38 | WIFE | — | PENNSYLVANIA |
| 57 | William Jr. Rahner | 18 | SON | — | PENNSYLVANIA |
| 58 | Donald Rahner | 16 | SON | — | PENNSYLVANIA |
| 59 | Lillian Rahner | 11 | DAUGHTER | — | PENNSYLVANIA |
| 60 | John M. Young | 52 | HEAD | Elevator Constructor | PENNSYLVANIA |
| 61 | Clara Young | 51 | WIFE | — | PENNSYLVANIA |
| 62 | Elizabeth O'Neill | 40 | HEAD | — | DELAWARE |
| 63 | Eleanor O'Neill | 17 | DAUGHTER | — | PENNSYLVANIA |
| 64 | Betty O'Neill | 16 | DAUGHTER | — | PENNSYLVANIA |
| 65 | Joseph O'Neill | 15 | SON | — | PENNSYLVANIA |
| 66 | Mary Jones | 69 | MOTHER | — | PENNSYLVANIA |
| 67 | John Mcdermott | 59 | HEAD | Machinist | EIRE |
| 68 | Catherine Mcdermott | 59 | WIFE | — | EIRE |
| 69 | Kenneth Mcdermott | 26 | SON | Baker | NEW YORK |
| 70 | Walter Mcdermott | 24 | SON | Baker | NEW YORK |
| 71 | Frank Bellworr | 38 | HEAD | Machinist | PENNSYLVANIA |
| 72 | Helen Bellworr | 35 | WIFE | — | PENNSYLVANIA |
| 73 | Elizabeth Bellworr | 17 | DAUGHTER | — | PENNSYLVANIA |
| 74 | Dorothy Bellworr | 4 | DAUGHTER | — | PENNSYLVANIA |
| 75 | John Bellworr | 0 | SON | — | PENNSYLVANIA |
| 77 | Frieda Herrmann | 50 | HEAD | Mailing Clerk | PENNSYLVANIA |
| 78 | John Coakley | 49 | HEAD | Clerk | PENNSYLVANIA |
| 79 | Margaret Coakley | 48 | WIFE | — | PENNSYLVANIA |
| 80 | Kathleen Coakley | 20 | DAUGHTER | — | PENNSYLVANIA |
Related Census Records
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)