MD
Mary Dempsey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Dempsey across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1858), then head of a 4-person household.
Age 82
b. ~1858
Female
Head
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Dempsey |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 82 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Arlington Town |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | 0 |
| Industry | 0 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | 0 |
| Township / Ward | Arlington Town |
| Est. Birth Year | ~1858 |
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 |
|---|---|---|---|---|
| Marguerite Dempsey | Daughter | — | 44 | ~1896 |
| Josephine Cahill | Daughter | — | 46 | ~1894 |
| Mary Dempsey | Head | — | 82 | ~1858 |
| Ruth Alacey | Other | — | 14 | ~1926 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 61
Middlesex, Massachusetts · implied b. ~1859 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Other, age 72
Middlesex, Massachusetts · implied b. ~1858 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 72 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 31 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 82
Middlesex-County, Massachusetts · implied b. ~1858 — 4 household members
| Surname | Dempsey |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 82 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Arlington Town |
| 1935 Residence (County) | Middlesex |
| Occupation | 0 |
| Industry | 0 |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| 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 Dempsey 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 Dempsey
Head · 1940 · age 82 · b. ~1858 · 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-t0627-01601-00220)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marie, Ella A. Miano | 43 | Wife | 0 | Mass. |
| 42 | Marie, John F. Miano | 17 | Son | 0 | Mass. |
| 43 | Gaetano F. Rucci | 43 | Head | Cosmetologist | Italy |
| 44 | Concetta Rucci | 32 | Wife | 0 | Italy |
| 45 | Giovanni S. Rucci | 9 | Son | — | Massachusetts |
| 46 | Charles L. Berner | 45 | Head | Truck Driver | Massachusetts |
| 47 | Jane H. Berner | 45 | Wife | 0 | Massachusetts |
| 48 | John J. Hallisey | 46 | Head | Book Binder | Eire |
| 49 | Laura M. Hallisey | 48 | Wife | 0 | Massachusetts |
| 50 | Laura A. Hallisey | 26 | Daughter | Teacher | Massachusetts |
| 51 | John J. Hallisey | 21 | Son | Bus Boy | Massachusetts |
| 52 | Elizabeth Champion | 18 | Niece | Waitress | Massachusetts |
| 53 | Helen M. Champion | 15 | Niece | 0 | Massachusetts |
| 54 | Peter C. Kent | 33 | Head | Head Clerk | Massachusetts |
| 55 | Vera E. Kent | 32 | Wife | 0 | Massachusetts |
| 56 | Dorothy A. Kent | 13 | Daughter | — | Massachusetts |
| 57 | Eleanor Kent | 11 | Daughter | — | Massachusetts |
| 58 | Phyllis Kent | 4 | Daughter | — | Massachusetts |
| 59 | Matthew Kudera | 67 | Father | Tailor | Lithuania |
| 60 | Neil W. Macleod | 27 | Head | Trucker-Driver | Massachusetts |
| 61 | Doris Macleod | 27 | Wife | 0 | Massachusetts |
| 62 | Crystal M. Hill | 38 | Head | Comptometer Oper. | Vermont |
| 63 | Ralph D. Hill | 13 | Son | — | Massachusetts |
| 64 | Warren E. O'Leary | 30 | Head | Civil Engineer | Massachusetts |
| 65 | Alice G. O'Leary | 26 | Wife | 0 | Massachusetts |
| 66 | Robert W. O'Leary | 3 | Son | — | Massachusetts |
| 67 | David A. O'Leary | 1 | Son | — | Massachusetts |
| 68 | Nancy J. O'Leary | 0 | Daughter | — | Massachusetts |
| 69 | Joseph F. Sweeney | 57 | Father-in-law | Starter | Massachusetts |
| 70 | John J. Sweeney | 19 | Brother-in-law | Usher | Massachusetts |
| 71 | Rudolph Sommers | 52 | Head | Superintendent | Latvia |
| 72 | Emily Sommers | 54 | Wife | 0 | Latvia |
| 73 | Extra Line | None | — | — | — |
| 74 | Edgar E. | 25 | Son | Mechanical Engineer | Pennsylvania |
| 75 | Elizabeth V. | 25 | Daughter | 0 | Pennsylvania |
| 76 | Mary E. Dempsey THIS PERSON | 82 | Head | 0 | Massachusetts |
| 77 | Josephine K. Cahill | 46 | Daughter | 0 | Massachusetts |
| 78 | Marguerite L. Dempsey | 44 | Daughter | Private Secretary | Massachusetts |
| 79 | Ruth M. Alacey | 14 | Grand daughter | 0 | Massachusetts |
| 80 | Donald P. Prescott | 34 | Head | Research Chemist | Connecticut |
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)