Physical Address:  225 North Fountain Ave. Springfield, OH 45502 | Mailing Address: The Center City Association - PO Box 1291 Springfield, OH 45501 Since 1998 the Center City Association has been the only 501(c)3 non-profit organization focused solely on the revitalization of downtown Springfield by promoting downtown businesses, preserving and improving downtown amenities and advocating for downtown development.  Your tax deductible contribution strengthens the voice for downtown Springfield.