JC
John Cassidy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this John Cassidy across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Mary & Mary — first a son (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Cassidy |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem-City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Fountain Man |
| Industry | Drug Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 750 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Fountain Man |
| Township / Ward | Salemcity |
| Est. Birth Year | ~1916 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Thomas Cassidy | Head | — | 51 | ~1889 |
| Thomas Cassidy | Son | — | 25 | ~1915 |
| John Cassidy | Son | — | 24 | ~1916 |
| Joseph Cassidy | Son | — | 22 | ~1918 |
| Mary Cassidy | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Essex, Massachusetts
Son, age 4
Essex, Massachusetts · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, Massachusetts
Son, age 14
Essex, Massachusetts · implied b. ~1916 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cassidy |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 24
Essex-County, Massachusetts · implied b. ~1916 — 5 household members
| Surname | Cassidy |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem-City |
| 1935 Residence (County) | Essex |
| Occupation | Fountain Man |
| Industry | Drug Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 750 |
| Highest Grade | H-4 |
| 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 John Cassidy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Cassidy (~0.92 confidence) and mother Mary Cassidy (~0.92 confidence) and father Thomas Cassidy (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Cassidy
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Mary Cassidy
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
Thomas Cassidy
b. ~1889
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Cassidy
Son · 1940 · age 24 · b. ~1916 · Massachusetts
★ You are viewing this record
Sibling
Joseph Cassidy
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Cassidy
Sibling · 1940 · age 25
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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01589-00382)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Florence Carbone | 18 | Daughter | New Worker | Massachusetts |
| 42 | Charles Carbone | 48 | Head | Die Maker | Massachusetts |
| 43 | Blanche Carbone | 56 | Wife | — | Massachusetts |
| 44 | Eleanor E Carbone | 23 | Daughter | Elementary Teacher | Massachusetts |
| 45 | James J Cain | 73 | Head | — | Massachusetts |
| 46 | Francis R Millard | 45 | Head | Forrester | Massachusetts |
| 47 | Laura M Millard | 44 | Wife | — | Massachusetts |
| 48 | Louise M Millard | 14 | Daughter | — | Massachusetts |
| 49 | Jean Millard | 11 | Daughter | — | Massachusetts |
| 50 | Richard Millard | 8 | Son | — | Massachusetts |
| 51 | John F Doherty | 57 | Lodger | — | Massachusetts |
| 52 | George E Desjardins | 42 | Head | Jewelry Salesman | Massachusetts |
| 53 | Pauline L Desjardins | 42 | Wife | — | Massachusetts |
| 54 | Pauline L Desjardins | 19 | Daughter | — | Massachusetts |
| 55 | Jean C Desjardins | 14 | Daughter | — | Massachusetts |
| 56 | Jacqueline R Desjardins | 11 | Daughter | — | Massachusetts |
| 57 | Joseph F Mcturk | 41 | Head | Accountant | Vermont |
| 58 | Alice E Mcturk | 40 | Wife | — | Massachusetts |
| 59 | Eileen M Mcturk | 16 | Daughter | — | Massachusetts |
| 60 | Mary A O'Leary | 81 | Head | — | Massachusetts |
| 61 | Arthur F O'Leary | 48 | Son | Shoe Cutter | Massachusetts |
| 62 | Martin M Ryan | 54 | Head | Janitor | Massachusetts |
| 63 | Elizabeth Ryan | 52 | Wife | — | Massachusetts |
| 64 | Martin M Jr Ryan | 21 | Son | Salesman | Massachusetts |
| 65 | Louise E Ryan | 16 | Daughter | — | Massachusetts |
| 66 | John M Hassell | 45 | Head | Buffer | Massachusetts |
| 67 | Katherine M Hassell | 50 | Wife | — | Massachusetts |
| 68 | John T Hassell | 21 | Son | — | Massachusetts |
| 69 | John J Nevil | 55 | Head | Stationary Engineer | Eire |
| 70 | Ellen E Nevil | 51 | Wife | — | Eire |
| 71 | John P Byrne | 42 | Head | Assistant Foreman | Massachusetts |
| 72 | Mary B Byrne | 39 | Wife | — | Ireland |
| 73 | Jacqueline M Byrne | 8 | Daughter | — | New York |
| 74 | Robert E Byrne | 7 | Son | — | Massachusetts |
| 75 | Patricia A Byrne | 4 | Daughter | — | Massachusetts |
| 76 | Thomas F Cassidy | 51 | Head | Printer | Massachusetts |
| 77 | Mary E Cassidy | 52 | Wife | — | Massachusetts |
| 78 | Thomas F Jr Cassidy | 25 | Son | Salesman | Massachusetts |
| 79 | John P Cassidy THIS PERSON | 24 | Son | Fountain Man | Massachusetts |
| 80 | Joseph R Cassidy | 22 | Son | New Worker | Massachusetts |
Pedigree Summary
John + 2 siblings
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)