MD
Mary Duggan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this Mary Duggan across the 1930 and 1940 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 8-person household.
Age 8
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | Duggan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Occupation | Student |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Student |
| Township / Ward | Boston City |
| Est. Birth Year | ~1922 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ellen Duggan | Other | — | 39 | ~1891 |
| John Duggan | Son | — | 11 | ~1919 |
| James Duggan | Son | — | 4 | ~1926 |
| John Duggan | Head | — | 39 | ~1891 |
| Mary Duggan | Daughter | — | 8 | ~1922 |
| Catherine Duggan | Daughter | — | 14 | ~1916 |
| Joseph Duggan | Son | — | 1 | ~1929 |
| Ellen Duggan | Daughter | — | 15 | ~1915 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1922 — 8 household members
| Surname | Duggan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Student |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 18
Suffolk-County, Massachusetts · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Diggin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Bus Girl |
| Industry | Restaurant |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 310 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Duggan
Daughter · 1930 · age 8 · b. ~1922 · Massachusetts
★ You are viewing this record
Sibling
John Duggan
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Duggan
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duggan
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Duggan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duggan
Sibling · 1930 · age 4
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:massachusettscensus00reel954:0237)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Richard L Aubert | 44 | Head | Painter | New York |
| 2 | Grace G Aubert | 42 | Wife-H | — | Massachusetts |
| 3 | Emily L Aubert | 16 | Daughter | Student | Massachusetts |
| 4 | Richard C Aubert | 11 | Son | Student | Massachusetts |
| 5 | William T Mahoney | 42 | Head | Delivery Clerk | Massachusetts |
| 6 | Katherine M Mahoney | 39 | Wife-H | — | Massachusetts |
| 7 | Robert W Mahoney | 21 | Son | Bill Poster | Massachusetts |
| 8 | Mary K Mahoney | 18 | Daughter | Sorter | Massachusetts |
| 9 | William T Jr Mahoney | 17 | Son | Stock Boy | Massachusetts |
| 10 | John L Mahoney | 16 | Son | Student | Massachusetts |
| 11 | George F Mahoney | 10 | Son | Student | Massachusetts |
| 12 | Joseph Mahoney | 9 | Son | Student | Massachusetts |
| 13 | Paul Mahoney | 5 | Son | Student | Massachusetts |
| 14 | Charles Mahoney | 2 | Son | — | Massachusetts |
| 15 | John W Duggan | 39 | Head | Fireman | Massachusetts |
| 16 | Ellen F Duggan | 39 | Wife-H | — | Massachusetts |
| 17 | Ellen F Jr Duggan | 15 | Daughter | Student | Massachusetts |
| 18 | Catherine Duggan | 14 | Daughter | Student | Massachusetts |
| 19 | John Duggan | 11 | Son | Student | Massachusetts |
| 20 | Mary Duggan THIS PERSON | 8 | Daughter | Student | Massachusetts |
| 21 | James F Duggan | 4 | Son | — | Massachusetts |
| 22 | Joseph Duggan | 1 | Son | — | Massachusetts |
| 23 | Carl Bjornholm | 35 | Head | Electrician | Massachusetts |
| 24 | Helen A Bjornholm | 31 | Wife-H | — | Massachusetts |
| 25 | John E Bjornholm | 9 | Son | Student | Massachusetts |
| 26 | Carlton L Bjornholm | 7 | Son | Student | Massachusetts |
| 27 | Collins T Putnam | 37 | Head | Laundry Salesman | New York |
| 28 | Estelle T Putnam | 38 | Wife-H | — | Massachusetts |
| 29 | Muriel D Putnam | 9 | Daughter | Student | Massachusetts |
| 30 | Collins C Putnam | 8 | Son | Student | Massachusetts |
| 31 | Thomas H Grimshaw | 52 | Head | Motorman | England |
| 32 | Elizabeth T Grimshaw | 51 | Wife-H | — | Massachusetts |
| 33 | Elizabeth J Grimshaw | 26 | Daughter | Switchboard Operator | Massachusetts |
| 34 | Frederick A Grimshaw | 18 | Son | Student | Massachusetts |
| 35 | T Henry Grimshaw | 16 | Son | Student | Massachusetts |
| 36 | Lillian M Grimshaw | 12 | Daughter | Student | Massachusetts |
| 37 | Anna P Grimshaw | 8 | Daughter | Student | Massachusetts |
| 38 | William V Millian | 54 | Head | Painter | Massachusetts |
| 39 | Catherine Millian | 58 | Wife-H | — | Canada English |
| 40 | James S Parker | 23 | Stepson | Salesman | Massachusetts |
| 41 | James A O'Connor | 28 | Head | Buffer | Massachusetts |
| 42 | Jeannette O'Connor | 21 | Wife-H | — | Massachusetts |
| 43 | James F O'Connor | 2 | Son | — | Massachusetts |
| 44 | Louise V O'Connor | 0 | Daughter | — | Massachusetts |
| 45 | Bridget T O'Connor | 55 | Head-H | Restaurant Worker | Irish Free State |
| 46 | Margaret T O'Connor | 24 | Daughter | Typist | Massachusetts |
| 47 | John Regan | 42 | Head | Fireman | Northern Ireland |
| 48 | Nora Regan | 40 | Wife-H | — | Northern Ireland |
| 49 | Mary Regan | 13 | Daughter | Student | Massachusetts |
| 50 | Margaret Regan | 9 | Daughter | Student | 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)