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Mary Knapp — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Monroe, New York

Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Monroe, New York (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.

Age 2 b. ~1928 Female Daughter Born: New York Single

1930 Census Record Details

Census Year	1930
Location	Monroe, New York
Surname	Knapp
Given Name	Mary E.
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	2
Marital Status	Single
Birthplace	New York
Father's Birthplace	Germany
Mother's Birthplace	Germany
Additional Details
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york
Township / Ward	Rochester City
Est. Birth Year	~1928

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
George Knapp	Son	—	13	~1917
Arline Knapp	Daughter	—	15	~1915
Emile Knapp	Son	—	9	~1921
Lawrence Knapp	Son	—	5	~1925
Mary Knapp	Daughter	—	2	~1928
Louis Knapp	Head	—	57	~1873
William Knapp	Son	—	8	~1922
John Knapp	Son	—	18	~1912
Agnes Knapp	Spouse	—	42	~1888

Census Appearances

1930

Monroe, New …

Daughter, age 2

Monroe, New York · implied b. ~1928 — 9 household members

Surname	Knapp
Given Name	Mary E.
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	2
Marital Status	Single
Birthplace	New York
Father's Birthplace	Germany
Mother's Birthplace	Germany
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

1940

Monroe-County, New …

Daughter, age 12

Monroe-County, New York · implied b. ~1928 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Knopp
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	12
Marital Status	Single
Birthplace	New York
1935 Residence (City)	Some Place
1935 Residence (County)	Monroe
Highest Grade	No 6
1935 Residence	Same Place
Birth State	New York
Birth Country	United States
Birthplace (normalized)	new york

Model Tree

Linked across censuses

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

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This person

Anchor record

Mary Knapp

Daughter · 1930 · age 2 · b. ~1928 · New York

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Sibling

William Knapp

Sibling · 1930 · age 8

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Arline Knapp

Sibling · 1930 · age 15

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

John Knapp

Sibling · 1930 · age 18

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

George Knapp

Sibling · 1930 · age 13

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Emile Knapp

Sibling · 1930 · age 9

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Lawrence Knapp

Sibling · 1930 · age 5

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 — Monroe, New York Open full size

Page Contents

50 people indexed on this census page (ia:1930:newyorkcensus00reel1452rs:1058)

Line	Name	Age	Relation	Occupation	Birthplace
51	Gracia Pulis	58	Mother	None	Italy
52	Frank Costanza	34	Head	Upholsterer	Italy
53	Frances Costanza	28	Wife	Tailoress	Italy
54	Frank Jr. Costanza	6	Son	None	New York
55	Mary Costanza	60	Mother	None	Italy
56	Rosario Rizzo	59	Head	Laborer	Italy
57	Susan Rizzo	49	Wife	None	Italy
58	Marie Rizzo	13	Daughter	None	New York
59	Sam Rizzo	15	Son	None	New York
60	Lena Rizzo	19	Daughter	Saleswoman	Italy
61	Louis Knapp	57	Head	Laborer	Germany
62	Agnes Knapp	42	Wife	None	Germany
63	John Knapp	18	Son	Teamster	New York
64	Arline Knapp	15	Daughter	—	New York
65	George Knapp	13	Son	—	New York
66	Emile Jr. Knapp	9	Son	—	New York
67	William Knapp	8	Son	—	New York
68	Lawrence Knapp	5	Son	—	New York
69	Mary E. Knapp THIS PERSON	2	Daughter	—	New York
70	Angelo Cortina	44	Head	Truck Driver	Italy
71	Minnie Cortina	41	Wife	None	Italy
72	James Cortina	24	Son	Truck Driver	New York
73	Mary Cortina	19	Daughter	Bookkeeper	New York
74	Rose Cortina	15	Daughter	—	New York
75	Josephine Cortina	13	Daughter	—	New York
76	Joseph Cortina	11	Son	—	New York
77	Antoinette Cortina	8	Daughter	—	New York
78	Frank Cortina	7	Son	—	New York
79	Anthony Cortina	1	Son	—	New York
80	Charles Di Perri	47	Head	Laborer	Italy
81	Joe Di Perri	20	Son	—	Italy
82	Louis Di Perri	18	Son	—	Italy
83	Philip Di Perri	15	Son	—	New York
84	Margaret Di Perri	12	Daughter	—	New York
85	Mary Di Perri	10	Daughter	—	New York
86	Lucy Di Perri	8	Daughter	—	New York
87	Tony Di Perri	4	Son	—	New York
88	Patsy Alfieri	45	Head	Laborer	Italy
89	Lena Alfieri	41	Wife	None	Italy
90	Angeline Alfieri	21	Daughter	Machinist	Italy
91	Mike Alfieri	18	Son	None	Italy
92	Joseph Alfieri	17	Son	—	Italy
93	Victor Alfieri	13	Son	—	New York
94	Rosaria Alfieri	12	Daughter	—	New York
95	Cosimo Alfieri	9	Son	—	New York
96	Thomas Alfieri	7	Son	—	New York
97	Patsy Alfieri	5	Son	—	New York
98	Malena Marquis	45	Head	Forelady	Massachusetts
99	Marquis	None	—	—	—
100	John E. Vogt	55	Head	Shoe Worker	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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