MD
Mary Duggan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Duggan across the 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1916), then head of a 6-person household.
Age 14
b. ~1916
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Duggan |
| 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 |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | City Of Lowell |
| Est. Birth Year | ~1916 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Duggan | Daughter | — | 9 | ~1921 |
| Ann Duggan | Daughter | — | 7 | ~1923 |
| Francis Duggan | Son | — | 16 | ~1914 |
| Mary Duggan | Daughter | — | 14 | ~1916 |
| Helen Duggan | Head | — | 41 | ~1889 |
| Joseph Duggan | Son | — | 13 | ~1917 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 4
Middlesex, Massachusetts · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duggan |
| Given Name | Mary H |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 14
Middlesex, Massachusetts · implied b. ~1916 — 6 household members
| Surname | Duggan |
| 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/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 Duggan across 2 US Census years (1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duggan
Daughter · 1930 · age 14 · b. ~1916 · Massachusetts
★ You are viewing this record
Sibling
Ann Duggan
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Duggan
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duggan
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Duggan
Sibling · 1930 · age 16
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:massachusettscensus00reel922:0541)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lorraine Carroll | 2 | Daughter | — | Massachusetts |
| 2 | Sarah Rooney | 43 | Head | Housework | Massachusetts |
| 3 | William Brinnin | 46 | Head | Office Clerk | Massachusetts |
| 4 | Elizabeth Brinnin | 48 | Sister | Garment Inspector | Massachusetts |
| 5 | Hattie Brinnin | 54 | Sister | — | Massachusetts |
| 6 | Josie Campbell | 38 | Head | — | Massachusetts |
| 7 | John B. Campbell | 11 | Son | — | Massachusetts |
| 8 | Michael Daly | 53 | Head | Machinist | Irish Free State |
| 9 | Nora Daly | 47 | Wife | — | Massachusetts |
| 10 | Francis Daly | 27 | Son | Boilermaker | Massachusetts |
| 11 | William Daly | 23 | Son | Checker | Massachusetts |
| 12 | Harry Willis | 56 | Head | Weaver | England |
| 13 | Alice Willis | 52 | Wife | — | England |
| 14 | Florence Willis | 22 | Daughter | Weaver | England |
| 15 | Rose Willis | 21 | Daughter | Spinner | Massachusetts |
| 16 | Edith Willis | 16 | Daughter | — | Massachusetts |
| 17 | Daniel J. Duffy | 45 | Head | Stationary Engineer | Massachusetts |
| 18 | Mary Duffy | 43 | Wife | — | Massachusetts |
| 19 | Daniel Jr. Duffy | 20 | Son | Coverer | Massachusetts |
| 20 | Mary Duffy | 18 | Daughter | Mother'S Helper | Massachusetts |
| 21 | Mildred Duffy | 15 | Daughter | Printer | Massachusetts |
| 22 | James Duffy | 13 | Son | — | Massachusetts |
| 23 | Catherine Duffy | 6 | Daughter | — | Massachusetts |
| 24 | Ellen Mcgaure | 66 | Mother-in-law | Retired | Irish Free State |
| 25 | John Gosson | 37 | Head | Dyer | Canada-English |
| 26 | Josephine Gosson | 28 | Wife | — | Massachusetts |
| 27 | John Jr. Gosson | 9 | Son | — | Massachusetts |
| 28 | Robert Gosson | 8 | Son | — | Massachusetts |
| 29 | Walter F. Gosson | 6 | Son | — | Massachusetts |
| 30 | Veracina Gosson | 3 | Daughter | — | Massachusetts |
| 31 | Leo Gosson | 2 | Son | — | Massachusetts |
| 32 | William Ryan | 27 | Head | Assembler | Massachusetts |
| 33 | Helen Ryan | 24 | Wife | Spinner | Massachusetts |
| 34 | Mary Lynch | 77 | Head | — | Irish Free State |
| 35 | Dennis Lynch | 54 | Son | Weaver | Massachusetts |
| 36 | Julia Lynch | 32 | Daughter | Assembler | Massachusetts |
| 37 | Helen Duggan | 41 | Head | Proprietor | Massachusetts |
| 38 | Francis Duggan | 16 | Son | Printer | Massachusetts |
| 39 | Mary Duggan THIS PERSON | 14 | Daughter | — | Massachusetts |
| 40 | Joseph Duggan | 13 | Son | — | Massachusetts |
| 41 | Helen Duggan | 9 | Daughter | — | Massachusetts |
| 42 | Ann Duggan | 7 | Daughter | — | Massachusetts |
| 43 | George Mcwilliams | 42 | Head | School Janitor | Massachusetts |
| 44 | Catherine Mcwilliams | 39 | Wife | — | Massachusetts |
| 45 | Anna Mcwilliams | 10 | Daughter | — | Massachusetts |
| 46 | James Mcwilliams | 9 | Son | — | Massachusetts |
| 47 | George Jr. Mcwilliams | 6 | Son | — | Massachusetts |
| 48 | Dorothy Mcwilliams | 6 | Daughter | — | Massachusetts |
| 49 | John Mcwilliams | 4 | Son | — | Massachusetts |
| 50 | Leo Mcwilliams | 1 | Son | — | Massachusetts |
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)