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William Koch — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Union, New Jersey

Our Model Tree links this William Koch across the 1920 and 1930 US Censuses in Union, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 7-person household.

Age 13 b. ~1917 Male Son Born: New Jersey Single

1930 Census Record Details

Census Year	1930
Location	Union, New Jersey
Surname	Koch
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	13
Marital Status	Single
Birthplace	New Jersey
Father's Birthplace	New Jersey
Mother's Birthplace	New Jersey
Additional Details
Can Read/Write	Yes
Birth State	New Jersey
Birth Country	United States
Birthplace (normalized)	new jersey
Township / Ward	Elizabeth City
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.

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

Name	Relation to head	Relative to William	Age	Birth yr
Ruth Koch	Daughter	—	5	~1925
William Koch	Son	—	13	~1917
Mary Koch	Head	—	40	~1890
Marion Koch	Daughter	—	12	~1918
Charles Koch	Son	—	10	~1920
Edward Koch	Son	—	8	~1922
Helen Koch	Daughter	—	16	~1914

Census Appearances

1920

Union, New …

Son, age 3

Union, New Jersey · implied b. ~1917 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Koch
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	3
Marital Status	Single
Birthplace	New Jersey
Father's Birthplace	New Jersey
Mother's Birthplace	New Jersey
Occupation	none
Speaks English	Yes
Birth State	New Jersey
Birth Country	United States
Birthplace (normalized)	new jersey

1930

Union, New …

Son, age 13

Union, New Jersey · implied b. ~1917 — 7 household members

Surname	Koch
Given Name	William
Relationship to Head	Son
Sex	M
Color / Race	White
Age	13
Marital Status	Single
Birthplace	New Jersey
Father's Birthplace	New Jersey
Mother's Birthplace	New Jersey
Can Read/Write	Yes
Birth State	New Jersey
Birth Country	United States
Birthplace (normalized)	new jersey

Model Tree

Linked across censuses

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

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This person

Anchor record

William Koch

Son · 1930 · age 13 · b. ~1917 · New Jersey

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Sibling

Helen Koch

Sibling · 1930 · age 16

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Charles Koch

Sibling · 1930 · age 10

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Marion Koch

Sibling · 1930 · age 12

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Ruth Koch

Sibling · 1930 · age 5

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Edward Koch

Sibling · 1930 · age 8

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 — Union, New Jersey Open full size

Page Contents

49 people indexed on this census page (ia:1930:newjerseycensus00reel1386:0324)

Line	Name	Age	Relation	Occupation	Birthplace
51	John Rotunno	27	Head	Driver	New Jersey
52	Katherine Rotunno	27	Wife	—	New Jersey
53	Anita Rotunno	5	Daughter	—	New Jersey
54	Mary Koch	40	Head	—	New Jersey
55	Helen Koch	16	Daughter	Clerical	New Jersey
56	William Koch THIS PERSON	13	Son	—	New Jersey
57	Marion Koch	12	Daughter	—	New Jersey
58	Charles Koch	10	Son	—	New Jersey
59	Edward Koch	8	Son	—	New Jersey
60	Ruth Koch	5	Daughter	—	New Jersey
61	Elizabeth Schmitt	57	Head	—	Germany
62	William Schuppan	44	Head	Machinist	New York
63	Elizabeth Schuppan	37	Wife	—	New Jersey
64	Elizabeth Schuppan	15	Daughter	—	New Jersey
65	Julius Schuppan	42	Brother	Yateman	New York
66	Charles Targa	31	Head	Driver	Italy
67	Mary Targa	21	Wife	—	New Jersey
68	Charles N. Targa	1	Son	—	New Jersey
69	Julia Mckeon	55	Head	—	New York
70	Peter J. Mckeon	42	Brother	Laborer	New York
71	Mary L. Mckeon	52	Sister	Inspector	New York
72	Christopher Mckeon	83	Uncle	—	New York
73	Adam Machert	59	Head	Machinist	New York
74	Charles Machert	21	Son	Inspector	New Jersey
75	Katherine Machert	21	Daughter	—	New Jersey
76	Emily Meier	71	Head	—	Massachusetts
77	Josephine Lambert	40	Daughter	Cashier	Connecticut
78	William Forster	41	Head	Sexton	New Jersey
79	Lillian Forster	39	Wife	—	New York
80	William Forster	15	Son	—	New Jersey
81	Robert Forster	14	Son	—	New Jersey
82	Dorothy Forster	6	Daughter	—	New Jersey
83	John Kuritzky	17	Boarder	—	New Jersey
84	Ray Kuritzky	10	Boarder	—	New Jersey
85	Henry Forster	74	Father	—	Germany
86	Thomas Cox	55	Head	Machinist	New Jersey
87	Ellen Cox	54	Wife	—	New York
88	Sarah Booret	31	Daughter	—	New Jersey
89	George Cox	27	Son	Butcher	New Jersey
90	Thomas Cox	21	Son	Manager	New Jersey
91	Muriel Cummings	20	Daughter	Clerical	New Jersey
92	Francis Mccrudy	24	Head	Stock Clerk	New Jersey
93	Florence Mccrudy	24	Wife	—	New Jersey
94	Marilyn Mccrudy	5	Daughter	—	New Jersey
95	Audrey Mccrudy	3	Daughter	—	New Jersey
96	Francis Mccrudy	1	Son	—	New Jersey
97	Mary Mccrudy	43	Aunt	—	New Jersey
98	Thomas Lyons	36	Head	Machinist	New Jersey
99	Helen Lyons	27	Wife	—	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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