MD
Mary Dempsey — 1930 US Census Record
Model Tree available1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this Mary Dempsey across the 1910, 1920 and 1930 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed), with identified parents James & Addis — first a daughter (b.~1907), then head of a 7-person household.
Age 23
b. ~1907
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | Dempsey |
| Given Name | Mary Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Teacher |
| Township / Ward | Boston City Of |
| Est. Birth Year | ~1907 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frederick Dempsey | Head | — | 50 | ~1880 |
| J Dempsey | Son | — | 20 | ~1910 |
| Mary Dempsey | Daughter | — | 23 | ~1907 |
| Stanton Dempsey | Son | — | 19 | ~1911 |
| Gertrude Dempsey | Other | — | 45 | ~1885 |
| Helen Dempsey | Daughter | — | 16 | ~1914 |
| Mary Walsh | Other | — | 56 | ~1874 |
Census Appearances
1910
Suffolk, Massachusetts
Daughter, age 2
Suffolk, Massachusetts · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Speaks English | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Suffolk, Massachusetts
Daughter, age 12
Suffolk, Massachusetts · implied b. ~1908 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary N. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Daughter, age 23
Suffolk, Massachusetts · implied b. ~1907 — 7 household members
| Surname | Dempsey |
| Given Name | Mary Ruth |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Teacher |
| Industry | Public School |
| 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 Suffolk, Massachusetts, using XGBoost record linkage. Identified parents: father James Dempsey (~0.92 confidence) and father Addis Dempsey (~0.92 confidence) and mother Mary Dempsey (~0.92 confidence) and mother Johanna Dempsey (~0.92 confidence) and father Frederick Dempsey (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Dempsey
b. ~1862
Source father
● Household
· direct · ~0.92
Father
Addis Dempsey
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Mary Dempsey
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Johanna Dempsey
b. ~1873
Source mother
● Household
· direct · ~0.92
Father
Frederick Dempsey
b. ~1880
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Dempsey
Daughter · 1930 · age 23 · b. ~1907 · Massachusetts
★ You are viewing this record
Sibling
Helen Dempsey
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
J Dempsey
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanton Dempsey
Sibling · 1930 · age 19
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 — Suffolk, Massachusetts
Open full size
1930 US Federal Census — Suffolk, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel955:0896)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Roman Pickard | 50 | Head | Manufacturer | Poland |
| 52 | Wladya Pickard | 45 | Wife-H | — | Germany |
| 53 | Victoria Pickard | 24 | Daughter | — | Poland |
| 54 | Roman Pickard | 18 | Son | — | Massachusetts |
| 55 | William Barnes | 33 | Head | Cutter | Massachusetts |
| 56 | Marion S Barnes | 31 | Wife-H | — | Massachusetts |
| 57 | Andrew Ohlen | 62 | Head | Cabinet Maker | Sweden |
| 58 | Alma C Ohlen | 58 | Wife-H | — | Sweden |
| 59 | Arvid A Ohlen | 21 | Son | Salesman | Massachusetts |
| 60 | Ellen F Cadigan | 58 | Head | — | Massachusetts |
| 61 | Frederick Dempsey | 50 | Head | Broker | Massachusetts |
| 62 | Gertrude S Dempsey | 45 | Wife-H | — | Massachusetts |
| 63 | Mary Ruth Dempsey THIS PERSON | 23 | Daughter | Teacher | Massachusetts |
| 64 | J Frederick Dempsey | 20 | Son | Clerk | Massachusetts |
| 65 | Stanton Dempsey | 19 | Son | Office Man | Massachusetts |
| 66 | Helen L Dempsey | 16 | Daughter | — | Massachusetts |
| 67 | Mary A Walsh | 56 | Sister-Law | Dressmaker | Irish Free State |
| 68 | John F Bigley | 52 | Head | Bricklayer | Massachusetts |
| 69 | Margaret E Bigley | 45 | Wife-H | — | Massachusetts |
| 70 | Margaret M Bigley | 21 | Daughter | Clerk | Massachusetts |
| 71 | Helen G Bigley | 20 | Daughter | Clerk | Massachusetts |
| 72 | Mary F Bigley | 19 | Daughter | Clerk | Massachusetts |
| 73 | Martin J Bigley | 15 | Son | — | Massachusetts |
| 74 | John F Jr Bigley | 14 | Son | — | Massachusetts |
| 75 | James T Bigley | 11 | Son | — | Massachusetts |
| 76 | Edmund Bigley | 10 | Son | — | Massachusetts |
| 77 | Agnes Bigley | 8 | Daughter | — | Massachusetts |
| 78 | Francis Bigley | 5 | Son | — | Massachusetts |
| 79 | Jean M Bigley | 2 | Daughter | — | Massachusetts |
| 80 | Ellen J Sullivan | 68 | Mother-Law | — | Massachusetts |
| 81 | Joseph J Crowley | 50 | Head | Clerk | Massachusetts |
| 82 | Margaret E Crowley | 41 | Wife-H | — | Massachusetts |
| 83 | Joseph J Jr Crowley | 15 | Son | — | Massachusetts |
| 84 | Francis X Crowley | 13 | Son | — | Massachusetts |
| 85 | Gerard Crowley | 10 | Son | — | Massachusetts |
| 86 | Edward Mcgrory | 49 | Head | Clerk | Massachusetts |
| 87 | Mary C Mcgrory | 41 | Wife-H | — | Massachusetts |
| 88 | John E Mcgrory | 11 | Son | — | Massachusetts |
| 89 | Mary D Mcgrory | 11 | Daughter | — | Massachusetts |
| 90 | John Jacob | 77 | Father-Law | Repairman | Germany |
| 91 | Emma C Jacob | 36 | Sister-Law | Bookkeeper | Massachusetts |
| 92 | Edward E Adams | 48 | Head | Manager | Massachusetts |
| 93 | Elizabeth M Adams | 47 | Wife-H | — | North Ireland |
| 94 | Edward E Jr Adams | 18 | Son | — | Massachusetts |
| 95 | Elizabeth M Adams | 12 | Daughter | — | Massachusetts |
| 96 | Mary A Young | 55 | Head | — | Irish Free State |
| 97 | J Alfred H Young | 30 | Son | Accountant | Massachusetts |
| 98 | Ethel B Young | 23 | Daughter | Seamstress | Massachusetts |
| 99 | Margaret O Young | 20 | Daughter | Stenographer | Massachusetts |
| 100 | Helen M Young | 17 | Daughter | — | Massachusetts |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 5 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)