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William Duffy — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · New York, New York

Our Model Tree links this William Duffy across the 1920 and 1930 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a son (b.~1902), then head of a 10-person household.

Age 28 b. ~1902 Male Son Born: New York Single

1930 Census Record Details

Census Year	1930
Location	New York, New York
Surname	Duffy
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	28
Marital Status	Single
Birthplace	New York
Father's Birthplace	New York
Mother's Birthplace	New York
Additional Details
Can Read/Write	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Township / Ward	Manhattan Borough
Est. Birth Year	~1902

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.

10 people recorded at the same address in the 1930 census.

Name	Relation to head	Relative to William	Age	Birth yr
Mary Duffy	Daughter	—	16	~1914
John Duffy	Head	—	56	~1874
James Duffy	Son	—	26	~1904
Joseph Duffy	Son	—	18	~1912
Edward Duffy	Son	—	24	~1906
William Duffy	Son	—	28	~1902
Francis Duffy	Son	—	20	~1910
Mary Duffy	Spouse	—	56	~1874
John Duffy	Son	—	30	~1900
Thomas Duffy	Son	—	22	~1908

Census Appearances

1920

New York, …

Son, age 18

New York, New York · implied b. ~1902 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duffy
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	18
Marital Status	Single
Birthplace	New York
Father's Birthplace	New York
Mother's Birthplace	New York
Occupation	Clerk
Industry	Trust Company
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1930

New York, …

Son, age 28

New York, New York · implied b. ~1902 — 10 household members

Surname	Duffy
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	28
Marital Status	Single
Birthplace	New York
Father's Birthplace	New York
Mother's Birthplace	New York
Can Read/Write	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

Our Model Tree links William Duffy across 2 US Census years (1920 and 1930) in New York, New York, using XGBoost record linkage.

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This person

Anchor record

William Duffy

Son · 1930 · age 28 · b. ~1902 · New York

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Sibling

James Duffy

Sibling · 1930 · age 26

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

John Duffy

Sibling · 1930 · age 30

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Edward Duffy

Sibling · 1930 · age 24

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Joseph Duffy

Sibling · 1930 · age 18

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Mary Duffy

Sibling · 1930 · age 16

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Francis Duffy

Sibling · 1930 · age 20

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Thomas Duffy

Sibling · 1930 · age 22

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 — New York, New York Open full size

Page Contents

50 people indexed on this census page (ia:1930:newyorkcensus00reel1505:0258)

Line	Name	Age	Relation	Occupation	Birthplace
1	John Duffy	56	Head	—	New York
2	Mary Duffy	56	Wife	—	New York
3	John Duffy	30	Son	Night Watchman	New York
4	William Duffy THIS PERSON	28	Son	—	New York
5	James Duffy	26	Son	—	New York
6	Edward Duffy	24	Son	—	New York
7	Thomas Duffy	22	Son	—	New York
8	Francis Duffy	20	Son	—	New York
9	Joseph Duffy	18	Son	—	New York
10	Mary Duffy	16	Daughter	—	New York
11	Janet Sorenson	63	Head	Watchman	Denmark
12	William Sorenson	35	Son	—	Germany
13	John Sorenson	33	Son	Street Cleaner	New York
14	Charlotte Sorenson	31	Wife	—	New York
15	John Sorenson	8	Son	—	New York
16	Charlotte Sorenson	6	Daughter	—	New York
17	Louis Sief	35	Head	—	New York
18	Esther Sief	12	Daughter	—	New York
19	Theresa Sief	12	Daughter	—	New York
20	Wilbur Sief	10	Son	—	New York
21	Arthur Sief	8	Son	—	New York
22	John Vitoli	39	Head	—	Italy
23	Mary Vitoli	35	Wife	—	Italy
24	Rose Vitoli	16	Daughter	—	New York
25	Anna Vitoli	14	Daughter	—	New York
26	Joseph Vitoli	12	Son	—	New York
27	Frank Vitoli	10	Son	—	New York
28	Anthony Vitoli	8	Son	—	New York
29	Louis Vitoli	6	Son	—	New York
30	Mary Vitoli	4	Daughter	—	New York
31	John Vitoli	2	Son	—	New York
32	Theresa Vitoli	1	Daughter	—	New York
33	John Duffy	40	Head	—	New York
34	Mary Duffy	38	Wife	—	New York
35	John Duffy	14	Son	—	New York
36	William Duffy	12	Son	—	New York
37	James Duffy	10	Son	—	New York
38	Margaret Duffy	38	Wife	—	New York
39	Edward Duffy	8	Son	—	New York
40	Thomas Duffy	6	Son	—	New York
41	Francis Duffy	4	Son	—	New York
42	Joseph Duffy	2	Son	—	New York
43	Mary Duffy	1	Daughter	—	New York
44	Charlotte Duffy	1	Daughter	—	New York
45	John Duffy	1	Son	—	New York
46	William Duffy	1	Son	—	New York
47	James Duffy	1	Son	—	New York
48	Edward Duffy	1	Son	—	New York
49	Thomas Duffy	1	Son	—	New York
50	Francis Duffy	1	Son	—	New York

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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)

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