MD
Mary Dempsey — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Dempsey across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Theresa — first a daughter (b.~1906), then head of a 5-person household.
Age 24
b. ~1906
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Dempsey |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Artist |
| Industry | Private office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Artist |
| Township / Ward | City Of Malden |
| Est. Birth Year | ~1906 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Dempsey | Daughter | — | 24 | ~1906 |
| Martin Dempsey | Son | — | 33 | ~1897 |
| John Dempsey | Head | — | 70 | ~1860 |
| Julia Dempsey | Daughter | — | 39 | ~1891 |
| Theresa Dempsey | Other | — | 67 | ~1863 |
Census Appearances
1910
Middlesex, Massachusetts
Daughter, age 3
Middlesex, Massachusetts · implied b. ~1907 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Daughter, age 14
Middlesex, Massachusetts · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 24
Middlesex, Massachusetts · implied b. ~1906 — 5 household members
| Surname | Dempsey |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Artist |
| Industry | Private office |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father John Dempsey (~0.92 confidence) and mother Theresa Dempsey (~0.92 confidence) and father John Dempsey (~0.92 confidence) and mother Annie Dempsey (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Dempsey
b. ~1861
Source father
● Household
· direct · ~0.92
Mother
Theresa Dempsey
b. ~1863
Source mother
● Household
· direct · ~0.92
Father
John Dempsey
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Annie Dempsey
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Dempsey
Daughter · 1930 · age 24 · b. ~1906 · Massachusetts
★ You are viewing this record
Sibling
Martin Dempsey
Sibling · 1930 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Dempsey
Sibling · 1930 · age 39
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel923:0015)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dorothy A. Morgan | 12 | Daughter | — | New Hampshire |
| 2 | Russell B. Morgan | 11 | Son | — | New Hampshire |
| 3 | William P. Powers | 70 | Head | — | Connecticut |
| 4 | Mary E. Powers | 38 | Daughter | — | Massachusetts |
| 5 | John F. Hughes | 46 | Head | Bookkeeper | Massachusetts |
| 6 | Dorothy G. Hughes | 34 | Wife-H | Commercial | Massachusetts |
| 7 | John R. Hughes | 14 | Son | — | Massachusetts |
| 8 | Robert Hughes | 11 | Son | — | Massachusetts |
| 9 | Dorothy G. Hughes | 9 | Daughter | — | Massachusetts |
| 10 | Richard H. Hughes | 6 | Son | — | Massachusetts |
| 11 | Mary A. Hughes | 1 | Daughter | — | Massachusetts |
| 12 | Guy O. Smith | 47 | Head | — | Massachusetts |
| 13 | Bernice E. Smith | 48 | Wife-H | Credit Manager | Massachusetts |
| 14 | Elizabeth B. Smith | 18 | Daughter | — | Massachusetts |
| 15 | Louise E. Smith | 18 | Daughter | — | Massachusetts |
| 16 | Adelaide T. Smith | 12 | Daughter | File Clerk | Massachusetts |
| 17 | Betty C. Smith | 10 | Daughter | — | Massachusetts |
| 18 | Arthur W. Smith | 7 | Son | — | Massachusetts |
| 19 | Adelaide L. Evans | 72 | Aunt | — | Massachusetts |
| 20 | Frank C. Nelson | 53 | Head | Physician | Massachusetts |
| 21 | Lucy C. Nelson | 52 | Wife-H | — | Massachusetts |
| 22 | Elizabeth Strider | 55 | Servant | Servant | Massachusetts |
| 23 | Tom P. Hobbs | 49 | Head | Manager | New Hampshire |
| 24 | Blanche S. Hobbs | 48 | Wife-H | — | New Hampshire |
| 25 | Barbara A. Hobbs | 18 | Daughter | — | New Hampshire |
| 26 | Richard L. Hobbs | 11 | Son | — | Massachusetts |
| 27 | Ronald P-Al. Hobbs | 22 | Son | — | New Hampshire |
| 28 | Gordon S-Al. Hobbs | 20 | Son | — | Maine |
| 29 | Agnes C. French | 39 | Head-H | Bookkeeper | Pennsylvania |
| 30 | Charles A. French | 20 | Son | Baggage Clerk | Massachusetts |
| 31 | Eleanor A. French | 11 | Daughter | — | Massachusetts |
| 32 | Thelma E. French | 9 | Daughter | — | Massachusetts |
| 33 | Lee S. Dunham | 32 | Head | Commercial Traveler | Massachusetts |
| 34 | Catherine M. Dunham | 32 | Wife-H | — | Holland |
| 35 | Dorothy N. Dunham | 4 | Daughter | — | Massachusetts |
| 36 | John H. Dempsey | 70 | Head | Night Watchman | Massachusetts |
| 37 | Theresa Dempsey | 67 | Wife-H | — | Massachusetts |
| 38 | Julia M. Dempsey | 39 | Daughter | Stenographer | Massachusetts |
| 39 | Martin J. Dempsey | 33 | Son | Fireman | Massachusetts |
| 40 | Mary F. Dempsey THIS PERSON | 24 | Daughter | Artist | Massachusetts |
| 41 | Patrick J. Herbert | 52 | Head | Engineer | Irish Free State |
| 42 | Alice E. Herbert | 27 | Daughter | Teacher | Massachusetts |
| 43 | John C. Glover | 42 | Head | Salesman | Massachusetts |
| 44 | Blanche P. Glover | 36 | Wife-H | — | Massachusetts |
| 45 | Martha A. Mc Donald | 65 | Head-H | — | Canada-England |
| 46 | Alice Mc Donald | 26 | Daughter | Saleslady | Massachusetts |
| 47 | Owen D. Thompson | 23 | Head | Secretary | Massachusetts |
| 48 | Dorothy D. Thompson | 23 | Wife-H | — | Massachusetts |
| 49 | Fred H. Dodge | 39 | Head | Clerk | Massachusetts |
| 50 | Louise A. Dodge | 32 | Wife-H | — | Massachusetts |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)