John Duffy — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Essex, New Jersey

Our Model Tree links this John Duffy across the 1920 and 1930 US Censuses in Essex, New Jersey (XGBoost, ~Confirmed) — first a head (b.~1885), then head of a 12-person household.

Age 45 b. ~1885 Male Head Born: Ireland Married

1930 Census Record Details

Census Year	1930
Location	Essex, New Jersey
Surname	Duffy
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Naturalized
Year of Immigration	1900
Age at First Marriage	25
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Additional Details
Can Read/Write	Yes
Mother Tongue	English
Home Owned/Rented	R
Birth Country	Ireland
Birthplace (normalized)	ireland
Township / Ward	Irvington Town
Est. Birth Year	~1885

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Margaret Duffy	Daughter	—	10	~1920
Mary Duffy	Daughter	—	16	~1914
Rose Duffy	Daughter	—	1	~1929
Theresa Duffy	Daughter	—	4	~1926
Catherine Duffy	Daughter	—	12	~1918
John Duffy	Head	—	45	~1885
John Duffy	Son	—	18	~1912
Thomas Duffy	Son	—	6	~1924
James Duffy	Son	—	8	~1922
Joseph Duffy	Son	—	2	~1928
William Duffy	Son	—	14	~1916
Catherine Duffy	Spouse	—	40	~1890

Census Appearances

1920

Essex, New …

Head, age 37

Essex, New Jersey · implied b. ~1883 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Duffy
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	37
Marital Status	Married
Birthplace	Ireland
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Mother Tongue	English
Home Owned/Rented	O
Home Free/Mortgaged	M
Birth Country	Ireland
Birthplace (normalized)	ireland

1930

Essex, New …

Head, age 45

Essex, New Jersey · implied b. ~1885 — 12 household members

Surname	Duffy
Given Name	John
Relationship to Head	Head
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	Ireland
Naturalization Status	Naturalized
Year of Immigration	1900
Age at First Marriage	25
Father's Birthplace	Ireland
Mother's Birthplace	Ireland
Can Read/Write	Yes
Mother Tongue	English
Home Owned/Rented	R
Birth Country	Ireland
Birthplace (normalized)	ireland

Model Tree

Linked across censuses

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

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This person

Anchor record

John Duffy

Head · 1930 · age 45 · b. ~1885 · New Jersey

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Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1930 US Federal Census — Essex, New Jersey Open full size

Page Contents

50 people indexed on this census page (ia:1930:newjerseycensus00reel1330:0570)

Line	Name	Age	Relation	Occupation	Birthplace
1	Mabel	45	Head	—	New Jersey
2	Mabel	21	Daughter	—	New Jersey
3	Dorothy	18	Daughter	—	New Jersey
4	William Lynch	45	Head	—	Canada
5	Anna Lynch	45	Wife	—	Canada
6	William Lynch	18	Son	Stenographer	New Jersey
7	Edward Lynch	16	Son	—	New Jersey
8	John Higgins	45	Head	Merchant	Germany
9	Mary Higgins	40	Wife	—	England
10	John Higgins	18	Son	—	New Jersey
11	William Higgins	16	Son	—	New Jersey
12	Mary Higgins	14	Daughter	—	New Jersey
13	James Higgins	12	Son	—	New Jersey
14	Thomas Higgins	10	Son	—	New Jersey
15	Joseph Higgins	8	Son	—	New Jersey
16	Catherine Higgins	6	Daughter	—	New Jersey
17	Margaret Higgins	4	Daughter	—	New Jersey
18	Theresa Higgins	2	Daughter	—	New Jersey
19	John Duffy THIS PERSON	45	Head	—	Ireland
20	Catherine Duffy	40	Wife	—	Pennsylvania
21	John Duffy	18	Son	—	New Jersey
22	Mary Duffy	16	Daughter	—	New Jersey
23	William Duffy	14	Son	—	New Jersey
24	Catherine Duffy	12	Daughter	—	New Jersey
25	Margaret Duffy	10	Daughter	—	New Jersey
26	James Duffy	8	Son	—	New Jersey
27	Thomas Duffy	6	Son	—	New Jersey
28	Theresa Duffy	4	Daughter	—	New Jersey
29	Joseph Duffy	2	Son	—	New Jersey
30	Rose Duffy	1	Daughter	—	New Jersey
31	John Duffy	45	Head	—	New Jersey
32	Mary Duffy	40	Wife	—	New Jersey
33	John Duffy	18	Son	—	New Jersey
34	William Duffy	16	Son	—	New Jersey
35	Catherine Duffy	14	Daughter	—	New Jersey
36	Margaret Duffy	12	Daughter	—	New Jersey
37	James Duffy	10	Son	—	New Jersey
38	Thomas Duffy	8	Son	—	New Jersey
39	Theresa Duffy	6	Daughter	—	New Jersey
40	Joseph Duffy	4	Son	—	New Jersey
41	Rose Duffy	2	Daughter	—	New Jersey
42	Mary Duffy	1	Daughter	—	New Jersey
43	John Duffy	45	Head	—	Germany
44	Mary Duffy	40	Wife	—	New Jersey
45	John Duffy	18	Son	—	New Jersey
46	William Duffy	16	Son	—	New Jersey
47	Catherine Duffy	14	Daughter	—	New Jersey
48	Margaret Duffy	12	Daughter	—	New Jersey
49	James Duffy	10	Son	—	New Jersey
50	Thomas Duffy	8	Son	—	New Jersey

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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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