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William Duffy — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Allamakee-County, Iowa

Our Model Tree links this William Duffy across the 1930 and 1940 US Censuses in Allamakee-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 9-person household.

Age 21 b. ~1919 Male Son Born: Iowa Single

1940 Census Record Details

Census Year1940
LocationAllamakee-County, Iowa
SurnameDuffy
Given NameWilliam Jr.
Relationship to HeadSon
SexM
Color / RaceWhite
Age21
Marital StatusSingle
BirthplaceIowa
1935 Residence (City)R
1935 Residence (County)Allamakee
Additional Details
OccupationFarm labor
IndustryFarm
Class of WorkerPW
Hours Worked45
Income (1939)866
Highest GradeNo 6
1935 ResidenceIowa
Birth StateIowa
Birth CountryUnited States
Birthplace (normalized)iowa
OccupationFarm Laborer
Township / WardLansing 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 1940 census.

Name Relation to head Relative to William Age Birth yr
Milton Duffy Son — 20 ~1920
George Duffy Son — 8 ~1932
Leslie Duffy Son — 15 ~1925
Anetta Duffy Spouse — 42 ~1898
William Duffy Son — 21 ~1919
Thelma Duffy Daughter — 10 ~1930
William Duffy Head — 46 ~1894
Charles Duffy Son — 15 ~1925
Marjorie Duffy Daughter — 5 ~1935

Census Appearances

1930
Allamakee, Iowa
Son, age 11
Allamakee, Iowa · implied b. ~1919 — 8 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Duffy
Given Name William C
Relationship to Head Son
Sex M
Color / Race White
Age 11
Marital Status Single
Birthplace Iowa
Father's Birthplace Iowa
Mother's Birthplace Iowa
Can Read/Write Yes
Birth State Iowa
Birth Country United States
Birthplace (normalized) iowa
1940
Allamakee-County, Iowa
Son, age 21
Allamakee-County, Iowa · implied b. ~1919 — 9 household members
Surname Duffy
Given Name William Jr.
Relationship to Head Son
Sex M
Color / Race White
Age 21
Marital Status Single
Birthplace Iowa
1935 Residence (City) R
1935 Residence (County) Allamakee
Occupation Farm labor
Industry Farm
Class of Worker PW
Hours Worked 45
Income (1939) 866
Highest Grade No 6
1935 Residence Iowa
Birth State Iowa
Birth Country United States
Birthplace (normalized) iowa

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 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Charles Duffy
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Duffy
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Milton Duffy
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Duffy
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leslie Duffy
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Duffy
Sibling · 1940 · age 5
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 — Allamakee-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01136-01019)

Line Name Age Relation Occupation Birthplace
41 Sone Culver 0 Son — Iowa
42 Minnie Wolsnam|Wolsman 62 Head Farm Laborer Iowa
43 Henry Wolsnam|Wolsman 30 Son Driving Truck Iowa
44 Daniel Wolsnam|Wolsman 27 Son — Iowa
45 Cora Wolsnam|Wolsman 22 Daughter — Iowa
46 Shirley Wolsnam|Wolsman 3 Daughter — Iowa
47 Mary Larmore 15 Head — Minnesota
48 Henrietta Larmore 14 Sister — Minnesota
49 James L. Waldron 45 Head Barber Iowa
50 Amanda Waldron 41 Wife — Minnesota
51 Vernon J. Waldron 21 Son New Worker Iowa
52 William R. Waldron 17 Son Trucking Iowa
53 John L. Waldron 17 Son — Iowa
54 Stanley Waldron 11 Son — Iowa
55 Maxine Waldron 8 Daughter — Iowa
56 Jean Ann Waldron 5 Daughter — Iowa
57 James Elmer Brian 62 Head Carpenter Painter Iowa
58 Pearl Brian 53 Wife — Iowa
59 J. Raymond Brian 21 Son — Iowa
60 Elmer L. Brian 16 Son — Iowa
61 Dorothy E. Brian 12 Daughter — Iowa
62 Louis Williamson 80 Head — Minnesota
63 Bessie Williamson 75 Wife — Iowa
64 Ida Salmon 46 Head Caring For Incubator Iowa
65 Arletta Salmon 21 Daughter Trucking Iowa
66 Alden Salmon 20 Son Servant Iowa
67 Mildred Salmon 17 Daughter House Work Iowa
68 Evelyn Haney 23 Head — Iowa
69 Virginia Haney 8 Daughter — Iowa
70 Reginald Haney 6 Son — Iowa
71 Thelma Haney 3 Daughter — Iowa
72 William Duffy 46 Head Reforestation Iowa
73 Anetta Duffy 42 Wife — Iowa
74 William Jr. Duffy THIS PERSON 21 Son Farm Labor Iowa
75 Milton Duffy 20 Son Farm Labor Iowa
76 Leslie Duffy 15 Son Farm Labor Iowa
77 Charles Duffy 15 Son Odd Jobs Iowa
78 Thelma Duffy 10 Daughter — Iowa
79 George Duffy 8 Son — Iowa
80 Marjorie Duffy 5 Daughter — Iowa

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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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