MC
Mary Cassidy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this Mary Cassidy across the 1930 and 1940 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 12-person household.
Age 8
b. ~1922
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1922 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cassidy | Daughter | — | 8 | ~1922 |
| Margaret Cassidy | Daughter | — | 12 | ~1918 |
| Elizabeth Cassidy | Daughter | — | 14 | ~1916 |
| Catherine Cassidy | Daughter | — | 4 | ~1926 |
| Bernard Cassidy | Head | — | 40 | ~1890 |
| John Cassidy | Son | — | 6 | ~1924 |
| Joseph Cassidy | Son | — | 16 | ~1914 |
| Robert Cassidy | Son | — | ~1930 | |
| James Cassidy | Son | — | 18 | ~1912 |
| Thomas Cassidy | Son | — | 2 | ~1928 |
| Bernard Cassidy | Son | — | 10 | ~1920 |
| Margaret Cassidy | Spouse | — | 38 | ~1892 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 8
Allegheny, Pennsylvania · implied b. ~1922 — 12 household members
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 19
Allegheny-County, Pennsylvania · implied b. ~1921 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Swissvale Borough |
| 1935 Residence (County) | Allegheny |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 · 1930 · age 8 · b. ~1922 · Pennsylvania
★ You are viewing this record
Sibling
John Cassidy
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Cassidy
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cassidy
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cassidy
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Cassidy
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cassidy
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Cassidy
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Cassidy
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cassidy
Sibling · 1930 · age 16
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
1930 US Federal Census — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel1976:0887)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bernard F Cassidy | 40 | Head | Policeman | Pennsylvania |
| 2 | Margaret J Cassidy | 38 | Wife | — | Pennsylvania |
| 3 | James B Cassidy | 18 | Son | — | Pennsylvania |
| 4 | Joseph J Cassidy | 16 | Son | — | Pennsylvania |
| 5 | Elizabeth Cassidy | 14 | Daughter | — | Pennsylvania |
| 6 | Margaret Cassidy | 12 | Daughter | — | Pennsylvania |
| 7 | Bernard Cassidy | 10 | Son | — | Pennsylvania |
| 8 | Mary Cassidy THIS PERSON | 8 | Daughter | — | Pennsylvania |
| 9 | John Cassidy | 6 | Son | — | Pennsylvania |
| 10 | Catherine Cassidy | 4 | Daughter | — | Pennsylvania |
| 11 | Thomas Cassidy | 2 | Son | — | Pennsylvania |
| 12 | Robert Cassidy | 0 | Son | — | Pennsylvania |
| 13 | Elizabeth Gates | 60 | Head-H | — | Pennsylvania |
| 14 | Helen Gates | 28 | Daughter | — | Pennsylvania |
| 15 | William Gates | 26 | Son | — | Pennsylvania |
| 16 | Elizabeth Gates | 24 | Daughter | — | Pennsylvania |
| 17 | John Harris | 50 | Head | — | Pennsylvania |
| 18 | Mary Harris | 48 | Wife | — | Pennsylvania |
| 19 | William Harris | 22 | Son | — | Pennsylvania |
| 20 | Ruth Harris | 18 | Daughter | — | Pennsylvania |
| 21 | Patrick Mccafferty | 55 | Head | — | Pennsylvania |
| 22 | Anna Mccafferty | 51 | Wife | — | Pennsylvania |
| 23 | James Mccafferty | 24 | Son | — | Pennsylvania |
| 24 | Edward C Lynch | 35 | Head | — | Pennsylvania |
| 25 | Anna Lynch | 33 | Wife | — | Pennsylvania |
| 26 | John Lynch | 8 | Son | — | Pennsylvania |
| 27 | John Valentine | 30 | Head | — | Pennsylvania |
| 28 | Gertie Valentine | 27 | Wife | — | Pennsylvania |
| 29 | John Valentine | 2 | Son | — | Pennsylvania |
| 30 | George Fowler | 55 | Head | — | Pennsylvania |
| 31 | Anna Fowler | 50 | Wife | — | Pennsylvania |
| 32 | George Fowler | 25 | Son | — | Pennsylvania |
| 33 | Anthony Hankus | 45 | Head | — | Pennsylvania |
| 34 | Martha Hankus | 40 | Wife | — | Pennsylvania |
| 35 | Mary Hankus | 18 | Daughter | — | Pennsylvania |
| 36 | Mildred Hankus | 15 | Daughter | — | Pennsylvania |
| 37 | Rose S Johnson | 50 | Head | — | Pennsylvania |
| 38 | Rose Johnson | 22 | Daughter | — | Pennsylvania |
| 39 | Agnes Johnson | 20 | Daughter | — | Pennsylvania |
| 40 | Helen Johnson | 18 | Daughter | — | Pennsylvania |
| 41 | Roy March | 40 | Head | — | Pennsylvania |
| 42 | Margaret March | 38 | Wife | — | Pennsylvania |
| 43 | Clara March | 18 | Daughter | — | Pennsylvania |
| 44 | Roy March | 16 | Son | — | Pennsylvania |
| 45 | Sarah March | 14 | Daughter | — | Pennsylvania |
| 46 | Charles March | 12 | Son | — | Pennsylvania |
| 47 | Margaret March | 10 | Daughter | — | Pennsylvania |
| 48 | William Patterson | 40 | Head | Machinist | Pennsylvania |
| 49 | Agnes Patterson | 36 | Wife | — | Pennsylvania |
| 50 | Robert J Patterson | 14 | Son | — | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)