WD
William Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Suffolk, Massachusetts
Our Model Tree links this William Duffy across the 1930 and 1940 US Censuses in Suffolk, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 9-person household.
Age 12
b. ~1918
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Suffolk, Massachusetts |
| Surname | Duffy |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada English |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1918 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Ella Duffy | Daughter | — | 10 | ~1920 |
| Rita Duffy | Daughter | — | 6 | ~1924 |
| Maude Duffy | Spouse | — | 36 | ~1894 |
| William Duffy | Head | — | 36 | ~1894 |
| Mary Duffy | Daughter | — | 4 | ~1926 |
| William Duffy | Son | — | 12 | ~1918 |
| Grace Duffy | Daughter | — | 14 | ~1916 |
| Francis Duffy | Son | — | 8 | ~1922 |
| Cornelius Duffy | Daughter | — | 1 | ~1929 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 12
Suffolk, Massachusetts · implied b. ~1918 — 9 household members
| Surname | Duffy |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada English |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 22
Suffolk-County, Massachusetts · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffey |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Cook |
| Industry | Restaurant |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 504 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| 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 William Duffy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Duffy
Son · 1930 · age 12 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
Cornelius Duffy
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ella Duffy
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Duffy
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Duffy
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Duffy
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Duffy
Sibling · 1930 · age 14
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:massachusettscensus00reel942:0050)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Russell G Stoddard | 27 | Lodger | Chauffeur | Massachusetts |
| 52 | Michael Russell | 55 | Lodger | Laborer | Irish Free State |
| 53 | William Peacock | 44 | Lodger | Woolsorter | England |
| 54 | Edward J Guthrie | 69 | Lodger | Packer | New York |
| 55 | — | None | — | — | — |
| 56 | Mary Townsend | 70 | Head | Nurse | Canada English |
| 57 | Catherine Christie | 54 | Head | Housework | Massachusetts |
| 58 | Allen De Mott | 25 | Head | Laborer | Massachusetts |
| 59 | Sarah De Mott | 23 | Wife | — | Massachusetts |
| 60 | Barbara J De Mott | 2 | Daughter | — | Massachusetts |
| 61 | Alfred King | 73 | Father-law | Carpenter | Canada English |
| 62 | Bertha M Hamlin | 46 | Head | Dressmaker | Massachusetts |
| 63 | James Barrett | 29 | Head | Longshoreman | Massachusetts |
| 64 | Isabel Barrett | 25 | Wife | — | Massachusetts |
| 65 | Harry Ritchie | 42 | Head | Painter | Maine |
| 66 | — | None | — | — | — |
| 67 | Alfred Ryan | 50 | Head | Fisherman | Russia |
| 68 | Margaret Ryan | 46 | Wife | — | Canada English |
| 69 | George Austin | 17 | Lodger | — | Canada English |
| 70 | Michael Cia | 43 | Head | Laborer | Italy |
| 71 | Marie Cia | 35 | Wife | — | Italy |
| 72 | Joseph Cia | 16 | Son | — | Massachusetts |
| 73 | Frank Cia | 13 | Son | — | Massachusetts |
| 74 | John Cia | 9 | Son | — | Massachusetts |
| 75 | Alfred Cia | 7 | Son | — | Massachusetts |
| 76 | Salvatore Cia | 2 | Son | — | Massachusetts |
| 77 | Morris Beahony | 64 | Head | Watchman | Canada French |
| 78 | Julia Beahony | 45 | Wife | — | Canada French |
| 79 | Horace V Beahony | 21 | Son | Longshoreman | Canada French |
| 80 | Angeline E Beahony | 15 | Daughter | — | Canada French |
| 81 | Joseph L Beahony | 4 | Son | — | Canada French |
| 82 | James Thomas | 28 | Head | Cable Placer | Massachusetts |
| 83 | Blanche M Thomas | 26 | Wife | — | Massachusetts |
| 84 | James Jr Thomas | 3 | Son | — | Massachusetts |
| 85 | Frederick J Thomas | 2 | Son | — | Massachusetts |
| 86 | Wallace L Thomas | 0 | Son | — | Massachusetts |
| 87 | Elizabeth J Forrest | 60 | Wife | — | Canada French |
| 88 | Frederick A Forrest | 62 | Head | Laborer | Canada French |
| 89 | Maude S Forrest | 31 | Daughter | Packer | Massachusetts |
| 90 | Lucille R Forrest | 15 | Daughter | — | Massachusetts |
| 91 | Jerry D Forrest | 17 | Son | — | Massachusetts |
| 92 | William Duffy | 36 | Head | Steamfitter | Massachusetts |
| 93 | Maude E Duffy | 36 | Wife | — | Canada English |
| 94 | Grace E Duffy | 14 | Daughter | — | Massachusetts |
| 95 | William Jr Duffy THIS PERSON | 12 | Son | — | Massachusetts |
| 96 | Ella M Duffy | 10 | Daughter | — | Massachusetts |
| 97 | Francis Duffy | 8 | Son | — | Massachusetts |
| 98 | Rita E Duffy | 6 | Daughter | — | Massachusetts |
| 99 | Mary R Duffy | 4 | Daughter | — | Massachusetts |
| 100 | Cornelius A Duffy | 1 | Daughter | — | Massachusetts |
Related Census Records
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)