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JK

John Knapp — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · Cook, Illinois

Our Model Tree links this John Knapp across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a son (b.~1910), then head of a 8-person household.

Age 20 b. ~1910 Male Son Born: Illinois Single

1930 Census Record Details

Census Year	1930
Location	Cook, Illinois
Surname	Knapp
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	20
Marital Status	Single
Birthplace	Illinois
Father's Birthplace	Poland
Mother's Birthplace	Poland
Additional Details
Can Read/Write	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois
Township / Ward	Chicago City
Est. Birth Year	~1910

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Frank Knapp	Son	—	7	~1923
Mary Knapp	Head	—	42	~1888
Helen Knapp	Daughter	—	6	~1924
Harriet Knapp	Daughter	—	13	~1917
Henry Knapp	Son	—	14	~1916
John Knapp	Son	—	20	~1910
Grace Knapp	Daughter	—	9	~1921
Sam Knapp	Son	—	15	~1915

Census Appearances

1920

Cook, Illinois

Son, age 10

Cook, Illinois · implied b. ~1910 — 7 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Knap
Given Name	Joe
Relationship to Head	Son
Sex	M
Color / Race	White
Age	10
Marital Status	Single
Birthplace	Illinois
Father's Birthplace	Poland
Mother's Birthplace	Poland
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

1930

Cook, Illinois

Son, age 20

Cook, Illinois · implied b. ~1910 — 8 household members

Surname	Knapp
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	20
Marital Status	Single
Birthplace	Illinois
Father's Birthplace	Poland
Mother's Birthplace	Poland
Can Read/Write	Yes
Birth State	Illinois
Birth Country	United States
Birthplace (normalized)	illinois

Model Tree

Linked across censuses

Our Model Tree links John Knapp across 2 US Census years (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.

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This person

Anchor record

John Knapp

Son · 1930 · age 20 · b. ~1910 · Illinois

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Sibling

Grace Knapp

Sibling · 1930 · age 9

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Harriet Knapp

Sibling · 1930 · age 13

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Sam Knapp

Sibling · 1930 · age 15

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Frank Knapp

Sibling · 1930 · age 7

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Helen Knapp

Sibling · 1930 · age 6

Source co-child of head (derived)

● Co-child · derived · ~0.88

Sibling

Henry Knapp

Sibling · 1930 · age 14

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 — Cook, Illinois Open full size

Page Contents

50 people indexed on this census page (ia:1930:illinoiscensus00reel437:0234)

Line	Name	Age	Relation	Occupation	Birthplace
1	Anna Skedel	61	Wife-H	—	Germany
2	Lillian Skedel	33	Daughter	Office Clerk	Illinois
3	Harry Sutherland	26	Step son	Ice Man	Illinois
4	Edward Rader	41	Head	Laborer	Illinois
5	Anna Rader	42	Wife-H	—	Illinois
6	Edward Jr. Rader	18	Son	—	Illinois
7	Helen Rader	15	Daughter	—	Illinois
8	Bernice Rader	8	Daughter	—	Illinois
9	Ruth Rader	2	Daughter	—	Illinois
10	John Ringhand	72	Father-in-law	—	Germany
11	John Ryan	75	Head	Checker	Irish Free State
12	Cora Ryan	39	Wife-H	—	Irish Free State
13	Michael Nunley	28	Brother-in-law	Canning	Irish Free State
14	John Zabel	47	Head	Elevator Op.	Czechoslovakia
15	Christine Zabel	43	Wife-H	—	Czechoslovakia
16	Elizabeth Zabel	21	Daughter	Typist	Czechoslovakia
17	Martin Zabel	15	Son	—	Illinois
18	Charles Longkanel	70	Head	—	Germany
19	Mary Knapp	42	Head	Cleaning Office	Poland
20	John Knapp THIS PERSON	20	Son	—	Illinois
21	Henry Knapp	14	Son	Maker Of Shades	Illinois
22	Sam Knapp	15	Son	—	Illinois
23	Harriet Knapp	13	Daughter	—	Illinois
24	Grace Knapp	9	Daughter	—	Illinois
25	Frank Knapp	7	Son	—	Illinois
26	Helen Knapp	6	Daughter	—	Illinois
27	Albertina Quach	62	Head	—	Germany
28	Louise Dreyer	79	Head	—	Germany
29	Marie Dreyer	55	Daughter	—	Illinois
30	John Hanlon	57	Head	Storekeeper	New York
31	Bertha Hanlon	54	Wife-H	—	Wisconsin
32	Irene Hanlon	22	Daughter	Operator	Wisconsin
33	John Veden	77	Head	—	Germany
34	Catherine Veden	72	Wife-H	—	Germany
35	Gesche Thieme	77	Head	—	Germany
36	Lydia Thieme	49	Daughter	Secretary	Germany
37	Lila Thieme	41	Daughter	Stenographer	Illinois
38	Fred Schmaltz	41	Head	Car Inspector	Illinois
39	Martha Schmaltz	42	Wife-H	—	Illinois
40	Ruth Schmaltz	17	Daughter	Operator	Illinois
41	Ethel Schmaltz	13	Daughter	—	Illinois
42	Irma Schmaltz	12	Daughter	—	Illinois
43	Irwin Schmaltz	8	Son	—	Illinois
44	Patrick O'Toole	50	Head	Police Officer	Illinois
45	Charlotte O'Toole	50	Wife-H	—	Illinois
46	Edward Kennedy	20	Step son	Clerk	Illinois
47	Marie Rehinder	78	Mother-in-law	—	Irish Free State
48	Leo Scholake	57	Head	Blacksmith	Poland
49	Agnes Scholake	47	Wife-H	—	Poland
50	Violet Sawit	15	Step daughter	—	Indiana

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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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