Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Vanguard Chester Funds and Shareholders of
Vanguard PRIMECAP Fund
Vanguard Target Retirement 2015 Fund
Vanguard Target Retirement 2020 Fund
Vanguard Target Retirement 2025 Fund
Vanguard Target Retirement 2030 Fund
Vanguard Target Retirement 2035 Fund
Vanguard Target Retirement 2040 Fund
Vanguard Target Retirement 2045 Fund
Vanguard Target Retirement 2050 Fund
Vanguard Target Retirement 2055 Fund
Vanguard Target Retirement 2060 Fund
Vanguard Target Retirement 2065 Fund
Vanguard Target Retirement Income Fund
Vanguard Institutional Target Retirement 2015 Fund
Vanguard Institutional Target Retirement 2020 Fund
Vanguard Institutional Target Retirement 2025 Fund
Vanguard Institutional Target Retirement 2030 Fund
Vanguard Institutional Target Retirement 2035 Fund
Vanguard Institutional Target Retirement 2040 Fund
Vanguard Institutional Target Retirement 2045 Fund
Vanguard Institutional Target Retirement 2050 Fund
Vanguard Institutional Target Retirement 2055 Fund
Vanguard Institutional Target Retirement 2060 Fund
Vanguard Institutional Target Retirement 2065 Fund and
Vanguard Institutional Target Retirement Income Fund

In planning and performing our audits of the financial statements of Vanguard PRIMECAP Fund,
Vanguard Target Retirement 2015 Fund, Vanguard Target Retirement 2020 Fund, Vanguard Target
Retirement 2025 Fund, Vanguard Target Retirement 2030 Fund, Vanguard Target Retirement 2035
Fund, Vanguard Target Retirement 2040 Fund, Vanguard Target Retirement 2045 Fund, Vanguard Target
Retirement 2050 Fund, Vanguard Target Retirement 2055 Fund, Vanguard Target Retirement 2060
Fund, Vanguard Target Retirement 2065 Fund, Vanguard Target Retirement Income Fund, Vanguard
Institutional Target Retirement 2015, Vanguard Institutional Target Retirement 2020 Fund, Vanguard
Institutional Target Retirement 2025 Fund, Vanguard Institutional Target Retirement 2030 Fund,
Vanguard Institutional Target Retirement 2035 Fund, Vanguard Institutional Target Retirement 2040
Fund, Vanguard Institutional Target Retirement 2045 Fund, Vanguard Institutional Target Retirement
2050 Fund, Vanguard Institutional Target Retirement 2055 Fund, Vanguard Institutional Target
Retirement 2060 Fund, Vanguard Institutional Target Retirement 2065 Fund and Vanguard Institutional
Target Retirement Income Fund (constituting Vanguard Chester Funds, hereafter collectively referred to
as the “Trust”) as of and for the year ended September 30, 2019, in accordance with the standards of the
Public Company Accounting Oversight Board (United States) (“PCAOB”), we considered the Trust’s
internal control over financial reporting, including controls over safeguarding securities, as a basis for

PricewaterhouseCoopers LLP, Two Commerce Square, Suite 1800, 2001 Market Street, Philadelphia, PA 19103-7042
T: (267) 330 3000, F: (267) 330 3300, www.pwc.com/us

designing our auditing procedures for the purpose of expressing our opinion on the financial statements
and to comply with the requirements of Form N-CEN, but not for the purpose of expressing an opinion on
the effectiveness of the Trust’s internal control over financial reporting. Accordingly, we do not express an
opinion on the effectiveness of the Trust’s internal control over financial reporting.

The management of the Trust is responsible for establishing and maintaining effective internal control
over financial reporting. In fulfilling this responsibility, estimates and judgments by management are
required to assess the expected benefits and related costs of controls. A company’s internal control over
financial reporting is a process designed to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles. A company’s internal control over financial reporting includes
those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of financial
statements in accordance with generally accepted accounting principles, and that receipts and
expenditures of the company are being made only in accordance with authorizations of management and
directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection
of unauthorized acquisition, use or disposition of a company’s assets that could have a material effect on
the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect
misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk
that controls may become inadequate because of changes in conditions, or that the degree of compliance
with the policies or procedures may deteriorate.

A deficiency in internal control over financial reporting exists when the design or operation of a control
does not allow management or employees, in the normal course of performing their assigned functions, to
prevent or detect misstatements on a timely basis. A material weakness is a deficiency, or a combination
of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a
material misstatement of the company’s annual or interim financial statements will not be prevented or
detected on a timely basis.

Our consideration of the Trust’s internal control over financial reporting was for the limited purpose
described in the first paragraph and would not necessarily disclose all deficiencies in internal control over
financial reporting that might be material weaknesses under standards established by the PCAOB.
However, we noted no deficiencies in the Funds’ internal control over financial reporting and its
operation, including controls over safeguarding securities, that we consider to be a material weakness as
defined above as of September 30, 2019.

This report is intended solely for the information and use of the Board of Trustees of Vanguard Chester
Funds and the Securities and Exchange Commission and is not intended to be and should not be used by
anyone other than these specified parties.