MC
Mary Cassidy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Berrien-County, Michigan
Our Model Tree links this Mary Cassidy across the 1930 and 1940 US Censuses in Berrien-County, Michigan (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Female
Daughter
Born: MICHIGAN
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Berrien-County, Michigan |
| Surname | CASSIDY |
| Given Name | MARY |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | MICHIGAN |
| 1935 Residence (City) | ST. JOSEPH |
| 1935 Residence (County) | BERRIEN |
| Additional Details | |
| Occupation | FINISHER |
| Industry | LAUNDRY |
| Class of Worker | PW |
| Hours Worked | 35 |
| Income (1939) | 252 |
| Highest Grade | H 4 |
| 1935 Residence | SAME HOUSE |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Finisher |
| Township / Ward | St Joseph |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cassidy | Daughter | — | 18 | ~1922 |
| Esther Cassidy | Daughter | — | 17 | ~1923 |
| Frances Cassidy | Daughter | — | 4 | ~1936 |
| William Cassidy | Head | — | 38 | ~1902 |
| Paul Cassidy | Son | — | 9 | ~1931 |
| Richard Cassidy | Son | — | 16 | ~1924 |
| Herbert Cassidy | Son | — | 11 | ~1929 |
| Patrick Cassidy | Son | — | 13 | ~1927 |
| Herman Cassidy | Son | — | 14 | ~1926 |
| Ella Cassidy | Spouse | — | 37 | ~1903 |
Census Appearances
1930
Berrien, Michigan
Daughter, age 8
Berrien, Michigan · implied b. ~1922 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Berrien-County, Michigan
Daughter, age 18
Berrien-County, Michigan · implied b. ~1922 — 10 household members
| Surname | CASSIDY |
| Given Name | MARY |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | MICHIGAN |
| 1935 Residence (City) | ST. JOSEPH |
| 1935 Residence (County) | BERRIEN |
| Occupation | FINISHER |
| Industry | LAUNDRY |
| Class of Worker | PW |
| Hours Worked | 35 |
| Income (1939) | 252 |
| Highest Grade | H 4 |
| 1935 Residence | SAME HOUSE |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 18 · b. ~1922 · Michigan
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Sibling
Frances Cassidy
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Cassidy
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Esther Cassidy
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Cassidy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herman Cassidy
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Cassidy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Cassidy
Sibling · 1940 · age 11
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 — Berrien-County, Michigan
Open full size
1940 US Federal Census — Berrien-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01733-00300)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Max Sommerfelt | 88 | HEAD | None | RUSSIA |
| 2 | Robert Sommerfelt | 37 | SON | Janitor | RUSSIA |
| 3 | Julia Krieger | 65 | DAUGHTER | None | RUSSIA |
| 4 | Helmer Shoemaker | 47 | HEAD | Foreman | MICHIGAN |
| 5 | Minnie Shoemaker | 51 | WIFE | None | MICHIGAN |
| 6 | Dan Randall | 37 | HEAD | Laborer | MICHIGAN |
| 7 | Nina Randall | 42 | WIFE | None | MICHIGAN |
| 8 | William Cassidy | 38 | HEAD | None | MICHIGAN |
| 9 | Ella Cassidy | 37 | WIFE | None | MICHIGAN |
| 10 | Mary Cassidy THIS PERSON | 18 | DAUGHTER | Finisher | MICHIGAN |
| 11 | Esther Cassidy | 17 | DAUGHTER | None | MICHIGAN |
| 12 | Richard Cassidy | 16 | SON | None | MICHIGAN |
| 13 | Herman Cassidy | 14 | SON | None | MICHIGAN |
| 14 | Patrick Cassidy | 13 | SON | None | MICHIGAN |
| 15 | Herbert Cassidy | 11 | SON | None | MICHIGAN |
| 16 | Paul Cassidy | 9 | SON | None | MICHIGAN |
| 17 | Frances Cassidy | 4 | DAUGHTER | None | MICHIGAN |
| 18 | Charles Saurbier | 56 | HEAD | Lineman | MICHIGAN |
| 19 | Hazel Saurbier | 50 | WIFE | None | MICHIGAN |
| 20 | Julius E. Saurbier | 29 | SON | Truck Driver | MICHIGAN |
| 21 | Paul Saurbier | 24 | SON | Laborer | MICHIGAN |
| 22 | Stephen Michael | 35 | HEAD | Moulder | INDIANA |
| 23 | Adrian Michael | 27 | WIFE | None | FRANCE |
| 24 | Betty Michael | 11 | DAUGHTER | None | ILLINOIS |
| 25 | Stephen Michael | 9 | SON | None | ILLINOIS |
| 26 | Lucille Michael | 2 | DAUGHTER | None | MICHIGAN |
| 27 | Beauregard Abel | 52 | HEAD | Laborer | RUSSIA |
| 28 | Pauline Abel | 43 | WIFE | None | RUSSIA |
| 29 | Antony Abel | 23 | SON | Laundryman | MICHIGAN |
| 30 | Edwin Abel | 19 | SON | Laborer | MICHIGAN |
| 31 | William Musser | 55 | HEAD | Pole Peeler | PENNSYLVANIA |
| 32 | Vernon Musser | 56 | WIFE | None | MICHIGAN |
| 33 | Vernon Griffin | 17 | SON | None | MICHIGAN |
| 34 | Jennie Rice | 78 | HEAD | None | WISCONSIN |
| 35 | Alonzo Rice | 47 | SON | Laborer | NEBRASKA |
| 36 | Rudolph Meusling | 29 | HEAD | Core Maker | WISCONSIN |
| 37 | Lillian Meusling | 20 | WIFE | None | MICHIGAN |
| 38 | Katherine Zajac | 51 | HEAD | None | GERMANY |
| 39 | Stanley Zajac | 21 | SON | Motor Maintenance | MICHIGAN |
| 40 | Sophia Zajac | 18 | DAUGHTER | None | FLORIDA |
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)