JD
John Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Providence, Rhode Island
Our Model Tree links this John Duffy across the 1920 and 1930 US Censuses in Providence, Rhode Island (XGBoost, ~Confirmed) — first a son (b.~1910), then head of a 10-person household.
Age 20
b. ~1910
Male
Son
Born: Rhode Island
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Providence, Rhode Island |
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Rhode Island |
| Father's Birthplace | Rhode Island |
| Mother's Birthplace | Rhode Island |
| Additional Details | |
| Occupation | Laborer |
| Industry | General |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Rhode Island |
| Birth Country | United States |
| Birthplace (normalized) | rhode island |
| Occupation | Laborer |
| Township / Ward | Providence City |
| Est. Birth Year | ~1910 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Alice Duffy | Daughter | — | 26 | ~1904 |
| Sarah Duffy | Daughter | — | 28 | ~1902 |
| Rita Duffy | Daughter | — | 14 | ~1916 |
| Catherine Duffy | Daughter | — | 18 | ~1912 |
| Helen Duffy | Daughter | — | 24 | ~1906 |
| Mary Duffy | Daughter | — | 30 | ~1900 |
| Anna Duffy | Daughter | — | 16 | ~1914 |
| Mary Duffy | Head | — | 60 | ~1870 |
| John Duffy | Son | — | 20 | ~1910 |
| James Duffy | Son | — | 22 | ~1908 |
Census Appearances
1920
Providence, Rhode …
Son, age 10
Providence, Rhode Island · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Rhode Island |
| Father's Birthplace | Rhode Island |
| Mother's Birthplace | Rhode Island |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Rhode Island |
| Birth Country | United States |
| Birthplace (normalized) | rhode island |
1930
Providence, Rhode …
Son, age 20
Providence, Rhode Island · implied b. ~1910 — 10 household members
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Rhode Island |
| Father's Birthplace | Rhode Island |
| Mother's Birthplace | Rhode Island |
| Occupation | Laborer |
| Industry | General |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Rhode Island |
| Birth Country | United States |
| Birthplace (normalized) | rhode island |
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 John Duffy across 2 US Census years (1920 and 1930) in Providence, Rhode Island, using XGBoost record linkage.
Show:
This person
Anchor record
John Duffy
Son · 1930 · age 20 · b. ~1910 · Rhode Island
★ You are viewing this record
Sibling
Mary Duffy
Sibling · 1930 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Duffy
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Duffy
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Duffy
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Duffy
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Duffy
Sibling · 1930 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duffy
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Duffy
Sibling · 1930 · age 26
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 — Providence, Rhode Island
Open full size
1930 US Federal Census — Providence, Rhode Island
Page Contents
50 people indexed on this census page (ia:1930:15thcensus2175unit:0160)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Duffy | 60 | Head | — | Rhode Island |
| 2 | Mary Duffy | 30 | Daughter | — | Rhode Island |
| 3 | Sarah Duffy | 28 | Daughter | — | Rhode Island |
| 4 | Alice Duffy | 26 | Daughter | — | Rhode Island |
| 5 | Helen Duffy | 24 | Daughter | — | Rhode Island |
| 6 | James Duffy | 22 | Son | Engineer | Rhode Island |
| 7 | John Duffy THIS PERSON | 20 | Son | Laborer | Rhode Island |
| 8 | Catherine Duffy | 18 | Daughter | — | Rhode Island |
| 9 | Anna Duffy | 16 | Daughter | — | Rhode Island |
| 10 | Rita Duffy | 14 | Daughter | — | Rhode Island |
| 11 | Frank Lynch | 27 | Head | Salesman | Rhode Island |
| 12 | Mary Lynch | 25 | Wife | — | Rhode Island |
| 13 | Robert Lynch | 4 | Son | — | Rhode Island |
| 14 | James Lynch | 48 | Head | Conductor | Massachusetts |
| 15 | Mary Lynch | 46 | Wife | Saleslady | Massachusetts |
| 16 | William Sheridan | 28 | Head | — | Rhode Island |
| 17 | Alice Sheridan | 25 | Wife | — | Rhode Island |
| 18 | William Sheridan | 2 | Son | — | Rhode Island |
| 19 | Ruth Sheridan | 1 | Daughter | — | Rhode Island |
| 20 | William Sheridan | 67 | Father | Master Mechanic | Rhode Island |
| 21 | Frank Gagan | 43 | Head | — | Vermont |
| 22 | Mary Gagan | 63 | Mother | — | Vermont |
| 23 | Albert Gagan | 39 | Head | Salesman | Rhode Island |
| 24 | Alice Gagan | 36 | Wife | — | Rhode Island |
| 25 | Barbara Gagan | 12 | Daughter | — | Rhode Island |
| 26 | Doris Gagan | 10 | Daughter | — | Rhode Island |
| 27 | Albert Gagan | 7 | Son | — | Rhode Island |
| 28 | Robert Gagan | 5 | Son | — | Rhode Island |
| 29 | Richard Gagan | 3 | Son | — | Rhode Island |
| 30 | Adeline Gagan | 1 | Daughter | — | Rhode Island |
| 31 | Thomas Walsh | 48 | Head | Clerk | Rhode Island |
| 32 | Marion Walsh | 42 | Wife | Bookkeeper | Canada English |
| 33 | Thomas Walsh | 16 | Son | — | Rhode Island |
| 34 | Marion Walsh | 14 | Daughter | — | Rhode Island |
| 35 | Edward Walsh | 12 | Son | — | Rhode Island |
| 36 | Joseph Walsh | 10 | Son | — | Rhode Island |
| 37 | William Walsh | 8 | Son | — | Rhode Island |
| 38 | Robert Walsh | 6 | Son | — | Rhode Island |
| 39 | Mary Walsh | 4 | Daughter | — | Rhode Island |
| 40 | John Walsh | 2 | Son | — | Rhode Island |
| 41 | Catherine Walsh | 1 | Daughter | — | Rhode Island |
| 42 | Alice Walsh | 0 | Daughter | — | Rhode Island |
| 43 | James Lynch | 65 | Head | — | Ireland |
| 44 | Margaret Lynch | 60 | Wife | — | Rhode Island |
| 45 | Mary Lynch | 39 | Daughter | Bookkeeper | Rhode Island |
| 46 | Margaret Lynch | 35 | Daughter | Teacher | Rhode Island |
| 47 | Alice Lynch | 32 | Daughter | Stenographer | Rhode Island |
| 48 | Leo Lynch | 22 | Son | Clerk | Rhode Island |
| 49 | James Lynch | 40 | Head | — | Rhode Island |
| 50 | Catherine Lynch | 38 | Wife | — | Rhode Island |
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)