WD
William Duffy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this William Duffy across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 9-person household.
Age 11
b. ~1919
Male
Son
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Mary Duffy | Spouse | — | 38 | ~1892 |
| William Duffy | Son | — | 11 | ~1919 |
| Catherine Duffy | Daughter | — | 9 | ~1921 |
| Michael Duffy | Head | — | 46 | ~1884 |
| Helen Duffy | Daughter | — | 12 | ~1918 |
| James Duffy | Son | — | 6 | ~1924 |
| Michael Duffy | Son | — | 8 | ~1922 |
| Anna Duffy | Daughter | — | 8 | ~1922 |
| John Duffy | Son | — | 6 | ~1924 |
Census Appearances
1920
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 11
Cook, Illinois · implied b. ~1919 — 9 household members
| Surname | Duffy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
William Duffy
Son · 1930 · age 11 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
James Duffy
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Duffy
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Duffy
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Duffy
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Duffy
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Duffy
Sibling · 1930 · age 12
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 — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel460:0432)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Engario Tonini | 49 | Head | Owner | Italy |
| 2 | Elizabeth Tonini | 55 | Wife | — | Italy |
| 3 | Lou Benedetti | 24 | Head | — | New York |
| 4 | Adella Benedetti | 25 | Daughter | Salesman | Illinois |
| 5 | Edith Tonini | 24 | Daughter | Steno | New York |
| 6 | Lillian Tonini | 19 | Daughter | Saleslady | Illinois |
| 7 | — | None | — | — | — |
| 8 | — | None | — | — | — |
| 9 | — | None | — | — | — |
| 10 | — | None | — | — | — |
| 11 | — | None | — | — | — |
| 12 | — | None | — | — | — |
| 13 | Tony Reisener | 52 | Head | Manager | Wisconsin |
| 14 | Anna Reisener | 42 | Wife | — | Indiana |
| 15 | Sylvia Reisener | 19 | Daughter | Saleslady | Wisconsin |
| 16 | Lillian Reisener | 17 | Daughter | — | Wisconsin |
| 17 | Eugene Reisener | 13 | Son | — | Wisconsin |
| 18 | Louisa Reisener | 8 | Daughter | — | Illinois |
| 19 | John Reisener | 5 | Son | — | Illinois |
| 20 | Richard Reisener | 2 | Son | — | Illinois |
| 21 | Nelson B. Prince | 52 | Head | Stockman | Connecticut |
| 22 | Irene E. Prince | 51 | Wife | — | Connecticut |
| 23 | Irene Prince | 18 | Daughter | — | Illinois |
| 24 | Gilbert Prince | 13 | Son | — | Illinois |
| 25 | Clarence Nugent | 25 | Son-in-law | Electrician | Illinois |
| 26 | Clarence Jr. Nugent | 1 | Grandson | — | Illinois |
| 27 | Emil Chalifoux | 40 | Head | Machinist | New York |
| 28 | Mary A. Chalifoux | 35 | Wife | — | Illinois |
| 29 | Robert Chalifoux | 16 | Son | — | Illinois |
| 30 | Emily Chalifoux | 14 | Daughter | — | Illinois |
| 31 | Edward Chalifoux | 12 | Son | — | Illinois |
| 32 | Lorraine Chalifoux | 9 | Daughter | — | Illinois |
| 33 | Wallace Chalifoux | 7 | Son | — | Illinois |
| 34 | Michael Duffy | 46 | Head | Pipe Layer | Ireland |
| 35 | Mary Duffy | 38 | Wife | — | Ireland |
| 36 | Helen Duffy | 12 | Daughter | — | Illinois |
| 37 | William Duffy THIS PERSON | 11 | Son | — | Illinois |
| 38 | Catherine Duffy | 9 | Daughter | — | Illinois |
| 39 | Anna Duffy | 8 | Daughter | — | Illinois |
| 40 | Michael Duffy | 8 | Son | — | Illinois |
| 41 | John Duffy | 6 | Son | — | Illinois |
| 42 | James Duffy | 6 | Son | — | Illinois |
| 43 | Thomas Carney | 49 | Head | Inspector | Illinois |
| 44 | Emma Carney | 49 | Wife | — | Illinois |
| 45 | Edward Carney | 28 | Son | Car Checker | Illinois |
| 46 | Walter Carney | 25 | Son | Carrier | Illinois |
| 47 | Charles Carney | 23 | Son | Carrier | Illinois |
| 48 | Laura Carney | 19 | Daughter | Binder | Illinois |
| 49 | Florence Carney | 16 | Daughter | Operator | Illinois |
| 50 | Bernice Carney | 12 | Daughter | — | Illinois |
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)