Normally investing in municipal money market securities. Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal and Arizona personal income taxes. Potentially investing up to 20% of assets in municipal securities whose interest is subject to Arizona personal income tax. Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments. Proposed Reorganization.  The Board of Trustees of Fidelity Union Street Trust II has unanimously approved an Agreement and Plan of Reorganization ("Agreement") between Fidelity ®  Arizona Municipal Money Market Fund and Fidelity ®  Municipal Money Market Fund pursuant to which Fidelity ®  Arizona Municipal Money Market Fund would be reorganized on a tax-free basis with and into Fidelity ®  Municipal Money Market Fund. As a result of the proposed Reorganization, shareholders of Fidelity ®  Arizona Municipal Money Market Fund would receive shares of Fidelity ®  Municipal Money Market Fund. The Agreement provides for the transfer of all of the assets of Fidelity ®  Arizona Municipal Money Market Fund in exchange for shares of Fidelity ®  Municipal Money Market Fund equal in value to the net assets of Fidelity ®  Arizona Municipal Money Market Fund and the assumption by Fidelity ®  Municipal Money Market Fund of all of the liabilities of Fidelity ®  Arizona Municipal Money Market Fund. After the exchange, Fidelity ®  Arizona Municipal Money Market Fund will distribute the Fidelity ®  Municipal Money Market Fund shares to its shareholders pro rata, in liquidation of Fidelity ®  Arizona Municipal Money Market Fund. As a result, shareholders of Fidelity ®  Arizona Municipal Money Market Fund will become shareholders of Fidelity ®  Municipal Money Market Fund (these transactions are collectively referred to as the "Reorganization"). A Special Meeting (the "Meeting") of the Shareholders of Fidelity ®  Arizona Municipal Money Market Fund is expected to be held on or about November 16, 2022 and approval of the Agreement will be voted on at that time. A combined proxy statement and prospectus containing more information with respect to the Reorganization will be provided to shareholders of record of Fidelity ®  Arizona Municipal Money Market Fund in advance of the meeting. If the Agreement is approved at the Meeting and certain conditions required by the Agreement are satisfied, the Reorganization is expected to take place on or about December 2, 2022. If shareholder approval of the Agreement is delayed due to failure to meet a quorum or otherwise, the Reorganization will become effective, if approved, as soon as practicable thereafter. If shareholder approval of the Agreement cannot be achieved, the Board of Trustees has approved a plan of liquidation for Fidelity ®  Arizona Municipal Money Market Fund. Following a failure to obtain shareholder approval, prior to such liquidation, the fund will be closed to new purchases and the assets will be managed to provide for sufficient liquidity to meet redemptions prior to liquidation. The foregoing is not a solicitation of any proxy. For a free copy of the Proxy Statement describing the Reorganization (and containing important information about fees, expenses and risk considerations) and a Prospectus for Fidelity ®  Municipal Money Market Fund, please call 1-800-544-8544. The prospectus/proxy statement will also be available for free on the Securities and Exchange Commission's web site (www.sec.gov).