John Knapp — 1940 US Census Record

Linked across censuses

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

Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Westchester-County, New York (XGBoost, ~Confirmed) — first a head (b.~1895), then head of a 6-person household.

Age 45 b. ~1895 Male Head Born: NEW YORK Married

1940 Census Record Details

Census Year	1940
Location	Westchester-County, New York
Surname	KNAPP
Given Name	JOHN E.
Relationship to Head	HEAD
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	NEW YORK
1935 Residence (City)	NEW YORK
1935 Residence (County)	KINGS
Additional Details
Occupation	POLICEMAN
Industry	STEAM RAILROAD
Class of Worker	PW
Hours Worked	48
Income (1939)	2014
Highest Grade	Hs 4
1935 Residence	NEW YORK
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Occupation	Policeman
Township / Ward	Peekskill
Est. Birth Year	~1895

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Isabella Knapp	Daughter	—	16	~1924
Isabella Knapp	Spouse	—	42	~1898
John Knapp	Son	—	11	~1929
Mary Knapp	Daughter	—	14	~1926
John Knapp	Head	—	45	~1895
Anna Knapp	Daughter	—	7	~1933

Census Appearances

1930

Westchester, New …

Head, age 35

Westchester, New York · implied b. ~1895 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Knapp
Given Name	John E
Relationship to Head	Head
Sex	M
Color / Race	White
Age	35
Marital Status	Married
Birthplace	New York
Age at First Marriage	25
Father's Birthplace	New York
Mother's Birthplace	New York
Occupation	patrolman
Industry	steam railroad
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	R
Home Value / Rent	25
Veteran	Yes W.W.
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1940

Westchester-County, New …

Head, age 45

Westchester-County, New York · implied b. ~1895 — 6 household members

Surname	KNAPP
Given Name	JOHN E.
Relationship to Head	HEAD
Sex	M
Color / Race	White
Age	45
Marital Status	Married
Birthplace	NEW YORK
1935 Residence (City)	NEW YORK
1935 Residence (County)	KINGS
Occupation	POLICEMAN
Industry	STEAM RAILROAD
Class of Worker	PW
Hours Worked	48
Income (1939)	2014
Highest Grade	Hs 4
1935 Residence	NEW YORK
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

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

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This person

Anchor record

John Knapp

Head · 1940 · age 45 · b. ~1895 · New York

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

Original Census Page

1940 US Federal Census — Westchester-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02811-00793)

Line	Name	Age	Relation	Occupation	Birthplace
41	Florence Broadie	46	WIFE	—	NEW YORK
42	Rana Broadie	19	DAUGHTER	Hat Trimmer	NEW YORK
43	Jacqueline Broadie	9	DAUGHTER	—	NEW YORK
44	Ralph Broadie	6	SON	—	NEW YORK
45	Frank Haines	49	HEAD	Watchman	NEW YORK
46	Grace Haines	48	WIFE	—	NEW YORK
47	Wilbur Hyatt	24	HEAD	Labor Foreman	NEW YORK
48	Ruth Hyatt	18	WIFE	—	NEW YORK
49	John E. Knapp THIS PERSON	45	HEAD	Policeman	NEW YORK
50	Isabella Knapp	42	WIFE	—	NEW YORK
51	Isabella Knapp	16	DAUGHTER	New Worker	NEW YORK
52	Mary L. Knapp	14	DAUGHTER	—	NEW YORK
53	John R. Knapp	11	SON	—	NEW YORK
54	Anna Knapp	7	DAUGHTER	—	NEW YORK
55	Anthony Marino	41	HEAD	Laborer	ITALY
56	Elizabeth Marino	27	WIFE	Hat Trimmer	GERMANY
57	Antoniette Marino	3	DAUGHTER	—	NEW YORK
58	Elizabeth Marino	1	DAUGHTER	—	NEW YORK
59	Thomas Longo	52	HEAD	Laborer	ITALY
60	Cora Wyant	53	HEAD	—	NEW YORK
61	Caroline Wyant	16	WIFE	—	NEW YORK
62	Abraham Haines	51	BROTHER	Watchman	NEW YORK
63	Walter Ruatt	31	HEAD	Laborer	NEW YORK
64	Margaret Ruatt	31	WIFE	—	NEW YORK
65	Walter Jr. Ruatt	13	SON	—	NEW YORK
66	Joan Ruatt	8	DAUGHTER	—	NEW YORK
67	Fred Briggs	58	FATHER IN-LAW	—	NEW YORK
68	Charles Miller	33	HEAD	Coppersmith Helper	NEW YORK
69	Evelyn Miller	30	WIFE	—	NEW YORK
70	Charles Miller	6	SON	—	NEW YORK
71	Virginia Miller	5	DAUGHTER	—	NEW YORK
72	Patricia Miller	2	DAUGHTER	—	NEW YORK
73	Richard Miller	0	SON	—	NEW YORK
74	Raymond Ryan	30	HEAD	Laborer	NEW YORK
75	Margaret Ryan	25	WIFE	Laundress	NEW YORK
76	Frank Burris	20	BROTHER IN-LAW	Laborer	NEW YORK
77	Henry Conklin	29	HEAD	Chauffeur	NEW YORK
78	Eva Conklin	28	WIFE	—	NEW YORK
79	Raymond Conklin	7	SON	—	NEW YORK
80	William Conklin	5	SON	—	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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