JD
John Duffy — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Cook, Illinois
Our Model Tree links this John Duffy across the 1910 and 1920 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 11-person household.
Age 11
b. ~1909
Male
Son
Born: Illinois
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Cook, Illinois |
| Surname | Duffy |
| Given Name | John V |
| 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 | |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
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.
11 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Duffy | Daughter | — | 1 | ~1919 |
| Elizabeth Duffy | Daughter | — | 3 | ~1917 |
| Virginia Duffy | Daughter | — | 12 | ~1908 |
| Nelly Duffy | Daughter | — | 13 | ~1907 |
| John Duffy | Head | — | 57 | ~1863 |
| John Duffy | Son | — | 11 | ~1909 |
| Timothy Duffy | Son | — | 5 | ~1915 |
| Thomas Duffy | Son | — | 9 | ~1911 |
| James Duffy | Son | — | 7 | ~1913 |
| Francis Duffy | Son | — | 8 | ~1912 |
| Nellie Duffy | Spouse | — | 57 | ~1863 |
Census Appearances
1910
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | John B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Cook, Illinois
Son, age 11
Cook, Illinois · implied b. ~1909 — 11 household members
| Surname | Duffy |
| Given Name | John V |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | 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 John Duffy across 2 US Census years (1910 and 1920) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
John Duffy
Son · 1920 · age 11 · b. ~1909 · Illinois
★ You are viewing this record
Sibling
Timothy Duffy
Sibling · 1920 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Duffy
Sibling · 1920 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Duffy
Sibling · 1920 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Duffy
Sibling · 1920 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Duffy
Sibling · 1920 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Duffy
Sibling · 1920 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nelly Duffy
Sibling · 1920 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duffy
Sibling · 1920 · age 7
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
1920 US Federal Census — Cook, Illinois
Open full size
1920 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu312unit:0064)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lera Smith | 11 | daughter | — | Illinois |
| 2 | Casimir Petrykowski | 43 | head | Turner | Poland |
| 3 | Amelia Petrykowski | 40 | wife | None | Poland |
| 4 | Alfred Petrykowski | 23 | son | Clerk | Illinois |
| 5 | Edmund Petrykowski | 22 | son | Driver | Poland |
| 6 | Lucille Petrykowski | 13 | daughter | None | Poland |
| 7 | Frederick Philpott | 52 | head | Machinist | England |
| 8 | Lina Philpott | 52 | wife | None | Holland |
| 9 | Esther I Philpott | 23 | daughter | Stenographer | Illinois |
| 10 | Peter Windauer | 51 | head | Woodworker | Hungary |
| 11 | Catherine Windauer | 47 | wife | None | Hungary |
| 12 | Margaret Windauer | 25 | daughter | None | Illinois |
| 13 | Ben Darling | 21 | boarder | Operator | Illinois |
| 14 | Edward Manning | 41 | head | Plasterer | Ireland |
| 15 | Nellie Manning | 25 | wife | None | Illinois |
| 16 | Mary Fenister | 54 | mother-in-law | None | Austria |
| 17 | Frank Engler | 42 | head | Asst Foreman | Indiana |
| 18 | Nellie Engler | 42 | wife | None | Indiana |
| 19 | Harry Monke | 5 | son | None | Indiana |
| 20 | John Fisher | 49 | head | Painter | Hungary |
| 21 | Elizabeth Fisher | 44 | wife | None | Hungary |
| 22 | Louis Fisher | 22 | son | Asst Supt | Hungary |
| 23 | Sarah Devery | 53 | head | Janitor | Ireland |
| 24 | William Devery | 22 | son | None | Illinois |
| 25 | John Duffy | 57 | head | None | Ireland |
| 26 | Nellie Duffy | 57 | wife | None | Ireland |
| 27 | Nelly Duffy | 13 | daughter | None | Illinois |
| 28 | Virginia Duffy | 12 | daughter | None | Illinois |
| 29 | John V Duffy THIS PERSON | 11 | son | None | Illinois |
| 30 | Thomas Duffy | 9 | son | None | Illinois |
| 31 | Francis Duffy | 8 | son | None | Illinois |
| 32 | James Duffy | 7 | son | None | Illinois |
| 33 | Timothy Duffy | 5 | son | None | Illinois |
| 34 | Elizabeth Duffy | 3 | daughter | None | Illinois |
| 35 | Mary Duffy | 1 | daughter | None | Illinois |
| 36 | Peter Chiaro | 26 | head | None | Illinois |
| 37 | Edith Chiaro | 22 | wife | None | Italy |
| 38 | William Chiaro | 3 | son | None | Illinois |
| 39 | Raymond Chiaro | 0 | son | None | Illinois |
| 40 | Alex Pugliese | 41 | head | None | Italy |
| 41 | Catherine Pugliese | 40 | wife | None | Italy |
| 42 | Mary Pugliese | 17 | daughter | None | Italy |
| 43 | John Saccitelli | 35 | head | None | Italy |
| 44 | Mary Saccitelli | 30 | wife | None | Italy |
| 45 | Vincent Saccitelli | 6 | son | None | Illinois |
| 46 | Rosalie Saccitelli | 4 | daughter | None | Illinois |
| 47 | John Frola | 30 | head | None | Italy |
| 48 | Caroline Frola | 26 | wife | None | Italy |
| 49 | Edward Frola | 5 | son | None | Illinois |
| 50 | Frola | None | — | — | — |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)