John Koch — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Bronx-County, New York

Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 5-person household.

Age 17 b. ~1923 Male Son Born: New York Single

1940 Census Record Details

Census Year	1940
Location	Bronx-County, New York
Surname	Koch
Given Name	John B.
Relationship to Head	Son
Sex	M
Color / Race	White
Age	17
Marital Status	Single
Birthplace	New York
1935 Residence (City)	New York City
1935 Residence (County)	Bronx
Additional Details
Industry	0
Highest Grade	H-3
1935 Residence	Same House
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Township / Ward	New York City
Est. Birth Year	~1923

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.

5 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to John	Age	Birth yr
John Koch	Son	—	17	~1923
Felice Koch	Spouse	—	54	~1886
Felice Koch	Daughter	—	24	~1916
Edward Koch	Head	—	54	~1886
Edward Koch	Son	—	30	~1910

Census Appearances

1930

Bronx, New …

Son, age 7

Bronx, New York · implied b. ~1923 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Koch
Given Name	John B
Relationship to Head	Son
Sex	M
Color / Race	White
Age	7
Marital Status	Single
Birthplace	New York
Father's Birthplace	New York
Mother's Birthplace	Massachusetts
Can Read/Write	Yes
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1940

Bronx-County, New …

Son, age 17

Bronx-County, New York · implied b. ~1923 — 5 household members

Surname	Koch
Given Name	John B.
Relationship to Head	Son
Sex	M
Color / Race	White
Age	17
Marital Status	Single
Birthplace	New York
1935 Residence (City)	New York City
1935 Residence (County)	Bronx
Industry	0
Highest Grade	H-3
1935 Residence	Same House
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

Our Model Tree links John Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Koch

Son · 1940 · age 17 · b. ~1923 · New York

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Sibling

Felice Koch

Sibling · 1940 · age 24

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Edward Koch

Sibling · 1940 · age 30

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 — Bronx-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02475-00335)

Line	Name	Age	Relation	Occupation	Birthplace
1	Tillie Fried	43	Wife	Bookkeeper	New York
2	Paul Fried	19	Son	Photographer	New York
3	Martin J. Fried	13	Son	—	New York
4	Michael Simmons	38	Head	Laborer	New York
5	Anna C. Simmons	36	Wife	—	New York
6	Michael A. Simmons	3	Son	—	New York
7	Milton Kasinsky	27	Head	Accountant	New York
8	Pauline Kasinsky	26	Wife	Examiner	New York
9	Herman Sellers	40	Head	Sales	Poland
10	Gifter Sellers	32	Wife	—	New York
11	Frank Messaro	29	Head	Laborer	New York
12	Camella Messaro	31	Wife	—	New York
13	Sanford Valleau	30	Head	Plumber	New York
14	Mary Valleau	22	Wife	Secretary	New York
15	David Ladimus	48	Head	Trucker	Russia
16	Fannie Ladimus	44	Wife	Draper	Russia
17	Fannie Doreal	52	Head	—	Russia
18	Sal Doreal	20	Son	Stock Clerk	New York
19	Jack Doreal	33	Son	Salesman	New York
20	Rose Doreal	24	Daughter-in-law	Office Worker	New York
21	Lawrence Burman	25	Head	Driving	New York
22	Jenny Burman	23	Wife	Order Clerk	New York
23	Edward H. Koch	54	Head	Salesman	New York
24	Felice E. Koch	54	Wife	—	Massachusetts
25	Edward H. Jr. Koch	30	Son	Dentist	New York
26	Felice E. Koch	24	Daughter	Cashier	New York
27	John B. Koch THIS PERSON	17	Son	—	New York
28	Dorathea Chase	33	Head	—	New York
29	Henry Chase	13	Son	—	New York
30	Guilford Chase	8	Son	—	New York
31	Morris Hyman	48	Head	Cutter	Poland
32	Adeline Hyman	21	Daughter	Stenographer	New York
33	Jerome Hyman	13	Son	—	New York
34	Morris Gordon	38	Head	Tailor	Russia
35	Eva Gordon	33	Wife	Operator	Russia
36	Bernard Schwartz	53	Head	Cleaner	Hungary
37	Rose Schwartz	47	Wife	—	Romania
38	Selma Schwartz	17	Daughter	—	New York
39	Julius S. Schwartz	21	Son	Painter	New York
40	Sally Friedman	14	Lodger	—	New York

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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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