MC
Mary Casey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Casey across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Margaret & Edward — first a spouse (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Casey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1913 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Lillian Casey | Daughter | — | 23 | ~1917 |
| William Casey | Head | — | 31 | ~1909 |
| John Casey | Son | — | 26 | ~1914 |
| Mary Casey | Spouse | — | 27 | ~1913 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 5
Middlesex, Massachusetts · implied b. ~1915 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Casey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 15
Middlesex, Massachusetts · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Casey |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 27
Middlesex-County, Massachusetts · implied b. ~1913 — 4 household members
| Surname | Casey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Industry | 0 |
| Class of Worker | No |
| Highest Grade | Hs 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 Mary Casey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Margaret Casey (~0.92 confidence) and father Edward Casey (~0.92 confidence) and mother Mary Casey (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Margaret Casey
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
Edward Casey
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Mary Casey
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Casey
Spouse · 1940 · age 27 · b. ~1913 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01702-00209)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Gibson | 10 | Son | — | Massachusetts |
| 42 | Richard Gibson | 8 | Son | — | Massachusetts |
| 43 | Edward Gibson | 7 | Son | — | Massachusetts |
| 44 | Mary Gibson | 6 | Daughter | — | Massachusetts |
| 45 | Dorothy Gibson | 5 | Daughter | — | Massachusetts |
| 46 | Elizabeth Gibson | 4 | Daughter | — | Massachusetts |
| 47 | Adrian Wankell | 24 | Head | Helper | Canada |
| 48 | Pauline Wankell | 25 | Wife | — | Canada |
| 49 | Donald Wankell | 9 | Son | — | Canada |
| 50 | Ronald Wankell | 9 | Son | — | Canada |
| 51 | Robert Wankell | 7 | Son | — | Massachusetts |
| 52 | Gerald Irvine | 23 | Head | Janitor | Massachusetts |
| 53 | Abigail Irvine | 18 | Wife | — | Massachusetts |
| 54 | — | None | — | — | — |
| 55 | Elizabeth Flynn | 67 | Head | — | England |
| 56 | Robert Flynn | 27 | Son | Timekeeper, Jr | Massachusetts |
| 57 | William Casey | 31 | Head | Operator | Massachusetts |
| 58 | Mary Casey THIS PERSON | 27 | Wife | — | Massachusetts |
| 59 | John Casey | 26 | Son | Chauffeur | Massachusetts |
| 60 | Lillian Casey | 23 | Daughter | Librarian | Massachusetts |
| 61 | John Phelan | 40 | Head | Supt | Massachusetts |
| 62 | Ruth Phelan | 35 | Wife | — | Massachusetts |
| 63 | Mary Phelan | 12 | Daughter | — | Massachusetts |
| 64 | Margaret Donovan | 52 | Head | Seamstress | Massachusetts |
| 65 | Evelyn Donovan | 19 | Daughter | — | Massachusetts |
| 66 | William Forrest | 26 | Head | Mechanic | Massachusetts |
| 67 | Dorothy Forrest | 22 | Wife | — | Massachusetts |
| 68 | William, Jr. Forrest | 1 | Son | — | Massachusetts |
| 69 | Edgar Vibbett | 45 | Head | Chauffeur | Maine |
| 70 | Edith Vibbett | 32 | Wife | — | Massachusetts |
| 71 | Virginia Vibbett | 8 | Daughter | — | Massachusetts |
| 72 | Edgar, Jr. Vibbett | 6 | Son | — | Massachusetts |
| 73 | John Burke | 23 | Head | Apprentice | Massachusetts |
| 74 | Mary Jane Burke | 25 | Wife | — | Ohio |
| 75 | Patrick Mcculligan | 26 | Head | Laborer | Massachusetts |
| 76 | Laura Mcculligan | 26 | Wife | — | Massachusetts |
| 77 | Dorothy Mcculligan | 9 | Daughter | — | Massachusetts |
| 78 | Richard Marcoux | 26 | Head | Laborer | Massachusetts |
| 79 | Irene Marcoux | 22 | Wife | — | Vermont |
| 80 | Richard, Jr. Marcoux | 1 | Son | — | Massachusetts |
Related Census Records
Pedigree Summary
Mary
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)