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William Knapp — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Middlesex-County, New Jersey

Our Model Tree links this William Knapp across the 1930 and 1940 US Censuses in Middlesex-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 7-person household.

Age 12 b. ~1928 Male Son Born: New Jersey Single

1940 Census Record Details

Census Year1940
LocationMiddlesex-County, New Jersey
SurnameKnapp
Given NameWilliam
Relationship to HeadSon
SexM
Color / RaceWhite
Age12
Marital StatusSingle
BirthplaceNew Jersey
1935 Residence (City)Piscataway Twp.
1935 Residence (County)Middlesex
Additional Details
Highest GradeNo 7
1935 ResidenceSame place
Birth StateNew Jersey
Birth CountryUnited States
Birthplace (normalized)new jersey
Township / WardPiscataway Twp
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.

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

Name Relation to head Relative to William Age Birth yr
Elsie Knapp Daughter — 14 ~1926
Lydia Knapp Spouse — 52 ~1888
Irene Knapp Daughter — 17 ~1923
Yoland Knapp Daughter — 30 ~1910
Frank Knapp Head — 53 ~1887
Dorothy Knapp Daughter — 10 ~1930
William Knapp Son — 12 ~1928

Census Appearances

1930
Middlesex, New …
Son, age 2
Middlesex, New Jersey · implied b. ~1928 — 8 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Knapp
Given Name William
Relationship to Head Son
Sex M
Color / Race White
Age 2
Marital Status Single
Birthplace New Jersey
Father's Birthplace Hungary
Mother's Birthplace Hungary
Occupation none
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey
1940
Middlesex-County, New …
Son, age 12
Middlesex-County, New Jersey · implied b. ~1928 — 7 household members
Surname Knapp
Given Name William
Relationship to Head Son
Sex M
Color / Race White
Age 12
Marital Status Single
Birthplace New Jersey
1935 Residence (City) Piscataway Twp.
1935 Residence (County) Middlesex
Highest Grade No 7
1935 Residence Same place
Birth State New Jersey
Birth Country United States
Birthplace (normalized) new jersey

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 12 · b. ~1928 · New Jersey
★ You are viewing this record
Sibling
Dorothy Knapp
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Yoland Knapp
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elsie Knapp
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene 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 — Middlesex-County, New Jersey Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-02362-00606)

Line Name Age Relation Occupation Birthplace
1 John Fazekas 37 Head Laborer Michigan
2 Anna Fazekas 33 Wife — New Jersey
3 John Fazekas 9 Son — New Jersey
4 Eleanor Fazekas 5 Daughter — New Jersey
5 Frank Knapp 53 Head Carpenter Hungary
6 Lydia Knapp 52 Wife — Hungary
7 Yoland Knapp 30 Daughter Skilled Worker New York
8 Irene Knapp 17 Daughter Saleslady New Jersey
9 Elsie Knapp 14 Daughter — New Jersey
10 William Knapp THIS PERSON 12 Son — New Jersey
11 Dorothy Knapp 10 Daughter — New Jersey
12 H. William Holdsworth 47 Head Guard New York
13 Germaine Holdsworth 43 Wife — France
14 Germaine Holdsworth 20 Daughter Packer New York
15 William Holdsworth 19 Son Shipper France
16 Ralph Holdsworth 16 Son — New Jersey
17 John Holdsworth 9 Son — New Jersey
18 Steve Silva 47 Head Varnisher Hungary
19 Anna Silva 46 Wife — Hungary
20 Alfred Silva 12 Son — New Jersey
21 George Karakuosh 47 Head Photographer Turkey
22 Sophie Karakuosh 40 Wife — Turkey
23 Frances Karakuosh 16 Daughter — California
24 Suel Hayden 52 Head — Maryland
25 Gene Overton 40 Servant Servant North Carolina
26 Johanna Overton 38 Servant Servant North Carolina
27 Hugh Boyd 28 Head Publisher New Jersey
28 Jean Boyd 26 Wife Housewife New Jersey
29 William Boyd 1 Son — New Jersey
30 Ernest Reinhardt 60 Servant Servant Germany
31 Louise Reinhardt 50 Wife Servant England
32 Eugene Agger 60 Head Instructor Ohio
33 May Agger 57 Wife — Ohio
34 Donald Agger 27 Son Musician New Jersey
35 Margaret Dorko 40 Servant Domestic Hungary
36 Mason Manley 46 Head Executive New Jersey
37 Edna Manley 45 Wife — New Jersey
38 Brooks Manley 15 Son — New Jersey
39 Edith E. Hairston 36 Servant Domestic Virginia

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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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