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- The Mahoning Valley Economic Development Corporation 4319 Belmont Avenue Youngstown, Ohio 44505 WELCOME! The Mahoning Valley Economic Development Corporation is a partnership of public and private interests focused on the revitalization and diversification of the Mahoning Valley in Northeastern Ohio. New 10, 000 Square Foot Building. Now available for SALE OR LEASE! Click HERE for Pictures and ...www.mvedc.com