MD
Mary Dempsey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Dempsey across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1874), then head of a 3-person household.
Age 66
b. ~1874
Female
Spouse
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Dempsey |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Lawrence |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same Place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Township / Ward | Lawrence |
| Est. Birth Year | ~1874 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Dempsey | Spouse | — | 66 | ~1874 |
| Michael Dempsey | Head | — | 72 | ~1868 |
| Agnes Dempsey | Daughter | — | 32 | ~1908 |
Census Appearances
1920
Essex, Massachusetts
Spouse, age 46
Essex, Massachusetts · implied b. ~1874 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary A. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1882 |
| Naturalization Status | Naturalized |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Year of Naturalization | 1892 |
| Birthplace (normalized) | england |
1930
Essex, Massachusetts
Spouse, age 55
Essex, Massachusetts · implied b. ~1875 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1882 |
| Age at First Marriage | 18 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Essex-County, Massachusetts
Spouse, age 66
Essex-County, Massachusetts · implied b. ~1874 — 3 household members
| Surname | Dempsey |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Lawrence |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Highest Grade | No 7 |
| 1935 Residence | Same Place |
| Birth Country | England |
| Birthplace (normalized) | england |
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
Spouse · 1940 · age 66 · b. ~1874 · 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 — 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-t0627-01582-00634)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael A. Murphy | 64 | Head | Inspector | Eire |
| 2 | Mary R. Murphy | 62 | Wife | — | Eire |
| 3 | Lois M. Wood | 22 | Nurse | Nurse | Massachusetts |
| 4 | Michael Dempsey | 72 | Head | — | England |
| 5 | Mary E. Dempsey THIS PERSON | 66 | Wife | — | England |
| 6 | Agnes Dempsey | 32 | Daughter | Teacher | Massachusetts |
| 7 | Joseph F. Devan | 69 | Head | Second Boss | England |
| 8 | Mary O. Devan | 66 | Wife | — | England |
| 9 | Elizabeth Devan | 30 | Daughter | Teacher | Massachusetts |
| 10 | Rita Devan | 27 | Daughter | — | Massachusetts |
| 11 | Cecilia Lee | 39 | Daughter | — | Massachusetts |
| 12 | Rose M. Lee | 6 | Daughter | — | Massachusetts |
| 13 | John D. Lee | 3 | Grandson | — | Massachusetts |
| 14 | John Lane | 78 | Head | — | Eire |
| 15 | Bessie D. Beckett | 50 | Daughter | Specting | Massachusetts |
| 16 | Winifred J. Beckett | 17 | Granddaughter | — | Massachusetts |
| 17 | Fred A. Sullivan | 44 | Head | Editor | Massachusetts |
| 18 | Josephine E. Sullivan | 44 | Wife | — | Massachusetts |
| 19 | John W. Mccarthy | 16 | Nephew | — | Massachusetts |
| 20 | Mary O. Sumner | 69 | Head | — | England |
| 21 | Joseph Sumner | 47 | Son | Woolsorter | England |
| 22 | Helen Canon | 69 | Roomer | — | England |
| 23 | Elizabeth O. Mckenna | 35 | Head | Teacher | Massachusetts |
| 24 | Mary J. Mckenna | 52 | Sister | — | Massachusetts |
| 25 | Charles A. Callahan | 55 | Head | Operator | Massachusetts |
| 26 | Mary V. Callahan | 56 | Wife | — | Eire |
| 27 | Helen Callahan | 26 | Daughter | Clerk | Massachusetts |
| 28 | Charles Jr. Callahan | 21 | Son | Harness Looker | Massachusetts |
| 29 | Herbert W. Eastwood | 57 | Head | Weaving Owner | Massachusetts |
| 30 | Sylvia Eastwood | 57 | Wife | — | Pennsylvania |
| 31 | Wilbert Eastwood | 26 | Daughter | Secretary | Massachusetts |
| 32 | Mabel Eastwood | 53 | Sister | Specting | Massachusetts |
| 33 | John J. Donovan | 51 | Head | Mailman | Massachusetts |
| 34 | Harriet B. Donovan | 52 | Wife | — | Massachusetts |
| 35 | Margaret Daley | 84 | Mother-in-law | — | Massachusetts |
| 36 | Abraham J. Batal | 45 | Head | Dentist | Syria |
| 37 | Camille A. Batal | 40 | Wife | — | New Hampshire |
| 38 | Martin B. Jr. Collins | 52 | Head | Salesman | Maine |
| 39 | Marion Collins | 44 | Wife | — | Massachusetts |
| 40 | Martin B. Jr. Collins | 18 | Son | — | Massachusetts |
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)