Vanguard Pennsylvania Municipal Money Market Fund

Supplement Dated July 6, 2020, to the Prospectus Dated March 27, 2020

Prospectus Text Changes

The following is added under the heading “The Funds and Vanguard” in the More on the Funds section:

Vanguard and the Fund’s Board have voluntarily agreed to temporarily limit certain net operating expenses in excess of the Fund’s daily yield so as to maintain a zero or positive yield for the Fund. Vanguard and the Fund’s Board may terminate the temporary expense limitation at any time.

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Vanguard Marketing Corporation, Distributor. PS 077A 072020