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William Knapp — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this William Knapp across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 7-person household.

Age 13 b. ~1927 Male Son Born: ILLINOIS Single

1940 Census Record Details

Census Year1940
LocationCook-County, Illinois
SurnameKNAPP
Given NameWILLIAM
Relationship to HeadSON
SexM
Color / RaceWhite
Age13
Marital StatusSingle
BirthplaceILLINOIS
1935 Residence (City)Chicago
1935 Residence (County)COOK
Additional Details
Highest GradeNo 6
1935 ResidenceSame place
Birth StateIllinois
Birth CountryUnited States
Birthplace (normalized)illinois
Township / WardChicago
Est. Birth Year~1927

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 1940 census.

Name Relation to head Relative to William Age Birth yr
Walter Knapp Son — 15 ~1925
Elsie Knapp Daughter — 16 ~1924
William Knapp Son — 13 ~1927
Walter Knapp Head — 67 ~1873
Bertha Knapp Spouse — 47 ~1893
Dorothy Knapp Daughter — 8 ~1932
Bertha Knapp Daughter — 10 ~1930

Census Appearances

1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Knopp
Given Name Wm.
Relationship to Head Son
Sex M
Color / Race White
Age 3
Marital Status Single
Birthplace Illinois
Father's Birthplace Illinois
Mother's Birthplace Illinois
Occupation none
Can Read/Write No
Birth State Illinois
Birth Country United States
Birthplace (normalized) illinois
1940
Cook-County, Illinois
Son, age 13
Cook-County, Illinois · implied b. ~1927 — 7 household members
Surname KNAPP
Given Name WILLIAM
Relationship to Head SON
Sex M
Color / Race White
Age 13
Marital Status Single
Birthplace ILLINOIS
1935 Residence (City) Chicago
1935 Residence (County) COOK
Highest Grade No 6
1935 Residence Same place
Birth State Illinois
Birth Country United States
Birthplace (normalized) illinois

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links William Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Knapp
Son · 1940 · age 13 · b. ~1927 · Illinois
★ You are viewing this record
Sibling
Walter Knapp
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elsie Knapp
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bertha Knapp
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Knapp
Sibling · 1940 · 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

1940 US Federal Census — Cook-County, Illinois Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-00978-00800)

Line Name Age Relation Occupation Birthplace
1 Helen Brown 32 WIFE — ILLINOIS
2 Fred Brown 9 SON — ILLINOIS
3 Charles R Brown 7 SON — ILLINOIS
4 Beverly Brown 3 DAUGHTER — ILLINOIS
5 Walter Knapp 67 HEAD Motorman ILLINOIS
6 Bertha Knapp 47 WIFE — ILLINOIS
7 Elsie Knapp 16 DAUGHTER — ILLINOIS
8 Walter Knapp 15 SON — ILLINOIS
9 William Knapp THIS PERSON 13 SON — ILLINOIS
10 Bertha Knapp 10 DAUGHTER — ILLINOIS
11 Dorothy Knapp 8 DAUGHTER — ILLINOIS
12 Amilia Dwyer 45 HEAD — ILLINOIS
13 John Dwyer 21 SON — ILLINOIS
14 Kenneth Dwyer 20 SON Enumerator ILLINOIS
15 Gerald Dwyer 17 SON — ILLINOIS
16 Victor Ferrari 42 BROTHER Iron Worker ILLINOIS
17 James F Welch 53 HEAD Foreman ILLINOIS
18 Edith Welch 46 WIFE — ILLINOIS
19 Edward Welch 17 SON — ILLINOIS
20 Albert Garafalo 43 HEAD Mechanic ITALY
21 Josephine Garafalo 45 WIFE — ITALY
22 Clara Agnini 20 STEP-DAUGHTER Inspector ILLINOIS
23 Carl Deleone 78 GRANDFATHER — ITALY
24 Patrick Mcgovern 44 HEAD Laborer NORTH IRELAND
25 Susan Mcgovern 43 WIFE — NORTH IRELAND
26 John Mcgovern 15 SON — ILLINOIS
27 Patrick Kenny 25 HEAD Car Cleaner ILLINOIS
28 Mary Kenny 20 WIFE — ILLINOIS
29 Joan Kenny 3 DAUGHTER — ILLINOIS
30 Mary L. Kenny 1 DAUGHTER — ILLINOIS
31 Chester Vandyke 48 HEAD Clerk ILLINOIS
32 Edna Vandyke 48 WIFE — ILLINOIS
33 Raymond Flack 35 BROTHER-IN-LAW Attendant ILLINOIS
34 Edward Murphy 37 LODGER Chauffeur ILLINOIS
35 Mary Schied 73 HEAD — ILLINOIS
36 Lorraine Schied 40 DAUGHTER Ass'T Cashier ILLINOIS
37 Dan Vitullo 38 HEAD Shoemaker ITALY
38 Adele Vitullo 34 WIFE Shoemaker MISSOURI
39 George Beiber 41 BROTHER Chauffeur ILLINOIS
40 Catherine Beiber 64 MOTHER — GERMANY

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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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