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William Duffy — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this William Duffy across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 8-person household.

Age 23 b. ~1917 Male Son Born: Illinois Single

1940 Census Record Details

Census Year1940
LocationCook-County, Illinois
SurnameDuffy
Given NameWilliam
Relationship to HeadSon
SexM
Color / RaceWhite
Age23
Marital StatusSingle
BirthplaceIllinois
1935 Residence (City)Chicago
1935 Residence (County)Cook
Additional Details
OccupationShipping Clerk
IndustryPerfume Mfg.
Class of WorkerPW
Hours Worked44
Income (1939)1100
Highest GradeH-4
1935 ResidenceSame place
Birth StateIllinois
Birth CountryUnited States
Birthplace (normalized)illinois
OccupationShipping Clerk
Township / WardChicago
Est. Birth Year~1917

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 1940 census.

Name Relation to head Relative to William Age Birth yr
John Duffy Son — 20 ~1920
Walter Duffy Son — 18 ~1922
James Duffy Son — 15 ~1925
Edward Duffy Son — 12 ~1928
Martin Duffy Head — 57 ~1883
Robert Duffy Son — 21 ~1919
Mary Duffy Other — 45 ~1895
William Duffy Son — 23 ~1917

Census Appearances

1930
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1917 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Duffy
Given Name William
Relationship to Head Son
Sex M
Color / Race White
Age 13
Marital Status Single
Birthplace Illinois
Father's Birthplace Illinois
Mother's Birthplace Illinois
Can Read/Write Yes
Birth State Illinois
Birth Country United States
Birthplace (normalized) illinois
1940
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 8 household members
Surname Duffy
Given Name William
Relationship to Head Son
Sex M
Color / Race White
Age 23
Marital Status Single
Birthplace Illinois
1935 Residence (City) Chicago
1935 Residence (County) Cook
Occupation Shipping Clerk
Industry Perfume Mfg.
Class of Worker PW
Hours Worked 44
Income (1939) 1100
Highest Grade H-4
1935 Residence Same place
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.
Linked across censuses
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 · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
Edward Duffy
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Duffy
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Duffy
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duffy
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Duffy
Sibling · 1940 · age 21
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

1940 US Federal Census — Cook-County, Illinois Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-00952-00202)

Line Name Age Relation Occupation Birthplace
1 Rose Hickey 28 Wife — Illinois
2 Anna Schneider 59 Wife — Czechoslovakia
3 Martin Duffy 57 Head Policeman Ireland
4 William Duffy THIS PERSON 23 Son Shipping Clerk Illinois
5 Robert Duffy 21 Son Shipping Clerk Illinois
6 John Duffy 20 Son H. Assembler Illinois
7 Walter Duffy 18 Son Crasher Illinois
8 James Duffy 15 Son — Illinois
9 Edward Duffy 12 Son — Illinois
10 Mary Duffy 45 Sister — Ireland
11 Peter Shackel 30 Head Laborer Wisconsin
12 Dorothy Shackel 25 Wife — Illinois
13 Gregory Shackel 5 Son — Illinois
14 Louis O'Connell 46 Head Attorney Illinois
15 Jane O'Connell 45 Wife — Illinois
16 Philip O'Connell 17 Son — Illinois
17 Robert O'Connell 15 Son — Illinois
18 Jane Marie O'Connell 12 Daughter — Illinois
19 Louis Jr. O'Connell 10 Son — Illinois
20 Charles Dreyer 48 Head Asst. Foreman Illinois
21 Pauline Dreyer 48 Wife — Illinois
22 Evelyn Dreyer 21 Daughter Typist Illinois
23 Charles Dreyer 11 Son — Illinois
24 Barney Van Laten 71 Head — Holland
25 Anne Van Laten 66 Wife — Holland
26 Mary Cheff 38 Daughter Switch Board Operator Illinois
27 Mary Virginia Cheff 17 Daughter — Illinois
28 William Quirk 41 Head Printer Illinois
29 Edith Quirk 36 Wife — Ohio
30 William Jr. Quirk 10 Son — Illinois
31 Peter Quirk 6 Son — Illinois
32 John J. Murray 41 Head Watchman Illinois
33 Nellie Murray 35 Wife Attendant Illinois
34 Edward W. Cheff 20 Head Truck Driver Illinois
35 Lillian Cheff 20 Wife Baker Illinois
36 Emil Schweigert 45 Father in law Salesman Illinois
37 John Palmerton 43 Head Baker England
38 Ethel Palmerton 36 Wife Lather England
39 Nancy Palmerton 4 Daughter — Illinois

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1940 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)

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