MC
Mary Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this Mary Cassidy across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 8-person household.
Age 48
b. ~1892
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | New York City |
| Est. Birth Year | ~1892 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eileen Cassidy | Daughter | — | 14 | ~1926 |
| Ann Cassidy | Daughter | — | 18 | ~1922 |
| Mary Cassidy | Head | — | 48 | ~1892 |
| Bernard Cassidy | Son | — | 20 | ~1920 |
| Alfred Cassidy | Son | — | 15 | ~1925 |
| Robert Cassidy | Son | — | 12 | ~1928 |
| Johnny Cassidy | Son | — | 17 | ~1923 |
| Thomas Cassidy | Son | — | 21 | ~1919 |
Census Appearances
1920
Kings, New …
Head, age 34
Kings, New York · implied b. ~1886 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Margaret |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Eng |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Kings, New …
Head, age 42
Kings, New York · implied b. ~1888 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Mary B |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1899 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Teacher |
| Industry | School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 65 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Kings-County, New …
Head, age 48
Kings-County, New York · implied b. ~1892 — 8 household members
| Surname | Cassidy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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.
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This person
Anchor record
Mary Cassidy
Head · 1940 · age 48 · b. ~1892 · New York
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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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
17 people indexed on this census page (nara:1940:m-t0627-02587-00664)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Walter Jablonski | 26 | Head | Feeder | New York |
| 2 | Helen Jablonski | 24 | Wife | — | New York |
| 3 | Gloria Jablonski | 6 | Daughter | — | New York |
| 4 | Mary Cassidy THIS PERSON | 48 | Head | — | Ireland |
| 5 | Thomas Cassidy | 21 | Son | 52 | New York |
| 6 | Bernard Cassidy | 20 | Son | Shipper | New York |
| 7 | Ann Marie Cassidy | 18 | Daughter | 52 | New York |
| 8 | Johnny Cassidy | 17 | Son | — | New York |
| 9 | Alfred Cassidy | 15 | Son | — | New York |
| 10 | Eileen Cassidy | 14 | Daughter | — | New York |
| 11 | Robert Cassidy | 12 | Son | — | New York |
| 12 | Catherine Marlow | 51 | Head | — | Ireland |
| 13 | Mary Marlow | 18 | Daughter | — | Ireland |
| 14 | Michael Marlow | 16 | Son | — | Scotland |
| 15 | John Marlow | 11 | Son | — | New York |
| 16 | Anna Walker | 55 | Head | — | New York |
| 17 | Patricia A. Walker | 12 | Daughter | — | 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)