MD
Margaret Duffy — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Margaret Duffy across the 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Stephen — first a daughter (b.~1899), then head of a 3-person household.
Age 31
b. ~1899
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Typist |
| Industry | Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Typist |
| Township / Ward | Town Of Arlington Part |
| Est. Birth Year | ~1899 |
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 1930 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Susan Duffy | Other | — | 59 | ~1871 |
| John Duffy | Head | — | 70 | ~1860 |
| Margaret Duffy | Daughter | — | 31 | ~1899 |
Census Appearances
1910
Middlesex, Massachusetts
Daughter, age 11
Middlesex, Massachusetts · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| 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 20
Middlesex, Massachusetts · implied b. ~1900 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Tel. Operator |
| Industry | Casket Factory |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 31
Middlesex, Massachusetts · implied b. ~1899 — 3 household members
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Typist |
| Industry | 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 Margaret Duffy across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: father John Duffy (~0.92 confidence) and father Stephen Duffy (~0.92 confidence) and mother Margaret Duffy (~0.92 confidence) and mother Margaret Duffy (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Duffy
b. ~1860
Source father
● Household
· direct · ~0.92
Father
Stephen Duffy
b. ~1858
Source father
● Household
· direct · ~0.92
Mother
Margaret Duffy
b. ~1862
Source mother
● Household
· direct · ~0.92
Mother
Margaret Duffy
b. ~1865
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Duffy
Daughter · 1930 · age 31 · b. ~1899 · Massachusetts
★ You are viewing this record
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:massachusettscensus00reel913:0840)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Duffy | 70 | Head | Sergeant | Massachusetts |
| 52 | Susan Duffy | 59 | Wife-H | — | Massachusetts |
| 53 | Margaret Duffy THIS PERSON | 31 | Daughter | Typist | Massachusetts |
| 54 | Robert J Brunt | 65 | Head | Harnessmaker | Canada English |
| 55 | Mary Brunt | 66 | Wife-H | — | Ireland English |
| 56 | Mildred Brunt | 40 | Daughter | — | Massachusetts |
| 57 | James J Walsh | 42 | Head | Manager | Massachusetts |
| 58 | Catherine Walsh | 39 | Wife-H | Operator | Massachusetts |
| 59 | James J Jr Walsh | 9 | Son | — | Massachusetts |
| 60 | Edward J Walsh | 7 | Son | — | Massachusetts |
| 61 | Marion Walsh | 6 | Daughter | — | Massachusetts |
| 62 | Allison Walsh | 5 | Daughter | — | Massachusetts |
| 63 | Catherine Walsh | 1 | Daughter | — | Massachusetts |
| 64 | Paul Geyer | 48 | Head | Supt | Massachusetts |
| 65 | Kate C Geyer | 48 | Wife-H | — | Canada English |
| 66 | Elmer Geyer | 16 | Son | — | Massachusetts |
| 67 | Walter S Geyer | 12 | Son | — | Massachusetts |
| 68 | Elizabeth Sympton | 77 | Mother-in-law | — | Scotland |
| 69 | William Romanos | 33 | Head | Electrician | Massachusetts |
| 70 | Catherine Romanos | 25 | Wife-H | — | Massachusetts |
| 71 | Robert Romanos | 2 | Son | — | Massachusetts |
| 72 | Mary Romanos | 1 | Daughter | — | Massachusetts |
| 73 | Mary Romanos | 19 | Maid | Servant | Massachusetts |
| 74 | William Herlihy | 39 | Head | Salesman | Massachusetts |
| 75 | Gertrude F Herlihy | 36 | Wife-H | — | Massachusetts |
| 76 | Esther Herlihy | 13 | Daughter | — | Massachusetts |
| 77 | Robert J Herlihy | 5 | Son | — | Massachusetts |
| 78 | Sophie Margaret Herlihy | 1 | Daughter | — | Massachusetts |
| 79 | Patrick B Goodman | 53 | Head | Salesman | West Virginia |
| 80 | Frances Goodman | 20 | Daughter | — | Maine |
| 81 | Priscilla Goodman | 19 | Daughter | — | Maine |
| 82 | Florence Goodman | 17 | Daughter | — | Massachusetts |
| 83 | Samuel J Smith | 52 | Head | Regulator | Canada English |
| 84 | Anna M Smith | 49 | Wife-H | — | Massachusetts |
| 85 | Eleanor Smith | 20 | Daughter | Operator Key | Massachusetts |
| 86 | Mildred Smith | 18 | Daughter | — | Massachusetts |
| 87 | Russell Smith | 11 | Son | — | Massachusetts |
| 88 | Robert Smith | 5 | Son | — | Massachusetts |
| 89 | Daniel B Valente | 44 | Head | Salesman | Italy |
| 90 | Alice B Valente | 40 | Wife-H | — | Maine |
| 91 | Evelyn M Valente | 23 | Daughter | Dancer | Maine |
| 92 | William Doherty | 52 | Head | Chef | Ireland |
| 93 | Theresa Doherty | 51 | Wife-H | — | Ireland |
| 94 | Ward Nellie Doherty | 24 | Daughter | Teacher | Ireland |
| 95 | William P Doherty | 22 | Son | Student | Ireland |
| 96 | William P Doherty | 22 | Son | Student | Massachusetts |
| 97 | Jesse Ferreira | 35 | Head | Grocer | Portugal |
| 98 | Amelia Ferreira | 33 | Wife-H | — | Portugal |
| 99 | Dorothy Ferreira | 7 | Daughter | — | Massachusetts |
| 100 | Frank Ferreira | 4 | Son | — | Massachusetts |
Pedigree Summary
Margaret
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)