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John Knapp — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Milwaukee-County, Wisconsin

Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Milwaukee-County, Wisconsin (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 7-person household.

Age 19 b. ~1921 Male Son Born: Wisconsin Single

1940 Census Record Details

Census Year1940
LocationMilwaukee-County, Wisconsin
SurnameKnapp
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceWhite
Age19
Marital StatusSingle
BirthplaceWisconsin
1935 Residence (City)Milwaukee
1935 Residence (County)Milwaukee
Additional Details
OccupationNew worker
Class of WorkerPW
Hours Worked39
Income (1939)0
Highest GradeHs 3
1935 ResidenceSame place
Birth StateWisconsin
Birth CountryUnited States
Birthplace (normalized)wisconsin
OccupationNew Worker
Township / WardMilwaukee
Est. Birth Year~1921

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 John Age Birth yr
John Knapp Son — 19 ~1921
Alfred Knapp Son — 24 ~1916
Marcella Knapp Daughter — 31 ~1909
Roland Knapp Son — 9 ~1931
Henry Knapp Head — 56 ~1884
Martha Knapp Spouse — 52 ~1888
Robert Knapp Son — 17 ~1923

Census Appearances

1930
Milwaukee, Wisconsin
Son, age 9
Milwaukee, Wisconsin · implied b. ~1921 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Knapp
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 9
Marital Status Single
Birthplace Wisconsin
Father's Birthplace Illinois
Mother's Birthplace Wisconsin
Can Read/Write Yes
Birth State Wisconsin
Birth Country United States
Birthplace (normalized) wisconsin
1940
Milwaukee-County, Wisconsin
Son, age 19
Milwaukee-County, Wisconsin · implied b. ~1921 — 7 household members
Surname Knapp
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 19
Marital Status Single
Birthplace Wisconsin
1935 Residence (City) Milwaukee
1935 Residence (County) Milwaukee
Occupation New worker
Class of Worker PW
Hours Worked 39
Income (1939) 0
Highest Grade Hs 3
1935 Residence Same place
Birth State Wisconsin
Birth Country United States
Birthplace (normalized) wisconsin

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 John Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Knapp
Son · 1940 · age 19 · b. ~1921 · Wisconsin
★ You are viewing this record
Sibling
Alfred Knapp
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marcella Knapp
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roland Knapp
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Knapp
Sibling · 1940 · age 17
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 — Milwaukee-County, Wisconsin Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-04566-00029)

Line Name Age Relation Occupation Birthplace
1 William Schubert 57 Head Printer Wisconsin
2 Mary E Schubert 52 Wife — Wisconsin
3 William Schubert 27 Son — Wisconsin
4 Florence Schubert 20 Daughter Painter Wisconsin
5 Archibald Gervais 49 Head Maid Michigan
6 Hazel Gervais 40 Wife Proprietor Iowa
7 Nancy Gervais 8 Daughter — Wisconsin
8 Ella Schilling 63 Mother-in-law — Iowa
9 Benjamin M Towle 29 Head Manager Wisconsin
10 Alphia O Towle 29 Wife Stenographer Iowa
11 Clarence P Thomson 39 Head Bus Driver Wisconsin
12 Isabel E Thomson 37 Wife — Wisconsin
13 Robert Thomson 10 Son — Wisconsin
14 Thomas Thomson 8 Son — Wisconsin
15 Marilyn Thomson 5 Daughter — Wisconsin
16 Jean Ann Thomson 2 Daughter — Wisconsin
17 Fred K Bauer 44 Head Laborer Germany
18 Martha O Bauer 41 Wife — Germany
19 Helmut Bauer 22 Son Laborer Germany
20 Richard Bauer 10 Son — Germany
21 William Schaefer 38 Head Shipping Clerk Wisconsin
22 Adele O Schaefer 33 Wife — Wisconsin
23 Richard Schaefer 9 Son — Wisconsin
24 Frances Schaefer 8 Daughter — Wisconsin
25 Joan Schaefer 7 Daughter — Wisconsin
26 Charleen Schaefer 3 Daughter — Wisconsin
27 Elmer J Keehan 47 Head Fireman Wisconsin
28 Sadie O Keehan 46 Wife — Wisconsin
29 Daniel W Keehan 10 Son — Wisconsin
30 Milton Wiesler 41 Head Repair Man Pennsylvania
31 Louise O Wiesler 39 Wife — Wisconsin
32 Milton Wiesler 11 Son — Wisconsin
33 Henry J Knapp 56 Head Letter Carrier Illinois
34 Martha O Knapp 52 Wife — Wisconsin
35 Marcella Knapp 31 Daughter Assistant Cashier Wisconsin
36 Alfred Knapp 24 Son Clerk Wisconsin
37 John Knapp THIS PERSON 19 Son New Worker Wisconsin
38 Robert Knapp 17 Son — Wisconsin
39 Roland Knapp 9 Son Delivery Boy Wisconsin

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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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