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Mary Knapp — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Jefferson-County, New York

Our Model Tree links this Mary Knapp across the 1920, 1930 and 1940 US Censuses in Jefferson-County, New York (XGBoost, ~Confirmed), with identified parents Arthur & Arthur — first a daughter (b.~1919), then head of a 10-person household.

Age 21 b. ~1919 Female Daughter Born: New York Single

1940 Census Record Details

Census Year1940
LocationJefferson-County, New York
SurnameKnapp
Given NameMary A.
Relationship to HeadDaughter
SexF
Color / RaceWhite
Age21
Marital StatusSingle
BirthplaceNew York
1935 Residence (City)Watertown City
1935 Residence (County)Jefferson
Additional Details
OccupationClerk
IndustryInsurance Co
Class of WorkerPW
Hours Worked40
Income (1939)750
Highest GradeC-4
1935 ResidenceSame House
Birth StateNew York
Birth CountryUnited States
Birthplace (normalized)new york
OccupationClerk
Township / WardWatertown City
Est. Birth Year~1919

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.

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

Name Relation to head Relative to Mary Age Birth yr
Carl Knapp Son — 9 ~1931
William Knapp Son — 17 ~1923
Alza Knapp Spouse — 43 ~1897
Donald Knapp Son — 5 ~1935
Mary Knapp Daughter — 21 ~1919
Arthur Knapp Head — 49 ~1891
Helen Knapp Daughter — 19 ~1921
Arthur Knapp Son — 10 ~1930
Allen Knapp Son — 12 ~1928
John Knapp Son — 7 ~1933

Census Appearances

1920
Jefferson, New …
Daughter, age 1
Jefferson, New York · implied b. ~1919 — 5 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Knapp
Given Name Mary
Relationship to Head Daughter
Sex F
Color / Race White
Age 1
Marital Status Single
Birthplace New York
Father's Birthplace New York
Mother's Birthplace New York
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1930
Jefferson, New …
Daughter, age 11
Jefferson, New York · implied b. ~1919 — 8 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Knapp
Given Name Mary A.
Relationship to Head Daughter
Sex F
Color / Race White
Age 11
Marital Status Single
Birthplace New York
Father's Birthplace New York
Mother's Birthplace New York
Can Read/Write Yes
Birth State New York
Birth Country United States
Birthplace (normalized) new york
1940
Jefferson-County, New …
Daughter, age 21
Jefferson-County, New York · implied b. ~1919 — 10 household members
Surname Knapp
Given Name Mary A.
Relationship to Head Daughter
Sex F
Color / Race White
Age 21
Marital Status Single
Birthplace New York
1935 Residence (City) Watertown City
1935 Residence (County) Jefferson
Occupation Clerk
Industry Insurance Co
Class of Worker PW
Hours Worked 40
Income (1939) 750
Highest Grade C-4
1935 Residence Same House
Birth State New York
Birth Country United States
Birthplace (normalized) new york

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.
Model Tree available
Our Model Tree links Mary Knapp across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arthur Knapp (~0.92 confidence) and father Arthur Knapp (~0.92 confidence) and mother Alice Knapp (~0.92 confidence) and mother Alza Knapp (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1 Parents confidence ≈ 0.92
Father
Arthur Knapp
b. ~1895
Source father
● Household · direct · ~0.92
Father
Arthur Knapp
b. ~1891
Source father
● Household · direct · ~0.92
Mother
Alice Knapp
b. ~1898
Source mother
● Household · direct · ~0.92
Mother
Alza Knapp
b. ~1897
Source mother
● Household · direct · ~0.92
This person
Anchor record
Mary Knapp
Daughter · 1940 · age 21 · b. ~1919 · New York
★ You are viewing this record
Sibling
John Knapp
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Knapp
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Knapp
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Knapp
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Knapp
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Allen Knapp
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Knapp
Sibling · 1940 · age 9
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 — Jefferson-County, New York Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-02545-00592)

Line Name Age Relation Occupation Birthplace
41 John Waldron 60 Head Caretaker New York
42 Mary C. Waldron 67 Wife — England
43 Arthur R. Knapp 49 Head Asst Supt New York
44 Alza A. Knapp 43 Wife — New York
45 Mary A. Knapp THIS PERSON 21 Daughter Clerk New York
46 Helen C. Knapp 19 Daughter Clerk New York
47 William A. Knapp 17 Son — New York
48 Allen C. Knapp 12 Son — New York
49 Arthur A. Knapp 10 Son — New York
50 Carl E. Knapp 9 Son — New York
51 John D. Knapp 7 Son — New York
52 Donald T. Knapp 5 Son — New York
53 J. A. Q. Coulter 57 Head Janitor & Treasurer New York
54 Marion P. Coulter 60 Wife — New York
55 Clarence M. Kendall 52 Head Manager New York
56 Florence M. Kendall 44 Wife — Canada-English
57 Constance M. Kendall 18 Daughter — New York
58 Frederic S. Kendall 16 Son — New York
59 Ivan S. Evans 55 Head Circulation Representative New York
60 Margaret S. Evans 35 Wife — New York
61 Mary F. Evans 6 Daughter — New York
62 Edward S. Evans 5 Son — New York
63 Evelyn A. Caldwell 19 Servant Maid New York
64 G. Gordon Brown 48 Head Landscape Architect New York
65 Mary F. Brown 43 Wife — New York
66 Elizabeth A. Brown 2 Daughter — New York
67 Neil E. Heinrich 38 Head Cashier New York
68 Dora F. Heinrich 37 Wife — New York
69 Neil F. Heinrich 14 Son — New York
70 Noel J. Heinrich 11 Son — New York
71 Fred G. Brownell 52 Head Superintendent New York
72 Jennie E. Brownell 48 Wife — New York
73 Frederick G. Jr. Brownell 20 Son Clerk New York
74 Clarence E. Hayes 38 Head Pharmacist New York
75 Florence M. Hayes 33 Wife — New York
76 Robert C. Hayes 12 Son — New York
77 Minnie E. Mchale 18 Servant Maid - Part-Time New York
78 Herman H. Ehler 45 Head Land & Tax Agent New Jersey
79 Clara M. Ehler 43 Wife — New Jersey
80 John L. Warner 54 Head Purchasing Agent New York

Related Census Records

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Pedigree Summary

Mary + 7 siblings
Gen 1 · 4 parents ~0.92
Max depth 4 (1900–1950 window)

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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