Justine Mangione

A New York City native, Justine relocated to Baltimore with her family in January 1996 and has proudly called the area home ever since. A licensed Realtor® since 2003, she brings over two decades of hands-on experience, deep local market knowledge, and an unwavering commitment to her clients. Justine serves clients throughout Baltimore County, Baltimore City, Harford, Carroll, and Howard Counties, helping them navigate each market with confidence and clarity.



Consistently recognized as a top producer, Justine believes real estate is the ultimate service business. She is known for truly listening to her clients, earning their trust through dedication, professionalism, and results. This client-first approach is reflected in her strong referral-based business and long-standing relationships.



Justine expertly guides buyers, sellers, and investors through every step of the transaction with a strategic plan, a results-driven mindset, and skilled negotiation. She is delighted to work with first-time homebuyers, seasoned investors, and sellers alike—whether assisting with an entry-level home or a luxury estate. Every client is valued, and every goal matters.



Committed to ongoing education and excellence, Justine has achieved the following professional designations: GRI (Graduate, REALTOR® Institute), ABR (Accredited Buyer’s Representative), and CNE (Certified Negotiation Expert)—further reinforcing her ability to deliver exceptional service and outcomes.



A cum laude graduate of Marymount Manhattan College with a B.A. in Business Administration, Justine previously built a successful career in New York City’s premier hotel industry, rising to the position of Director of Catering. There, she combined her business expertise with her passion for food, wine, and entertaining—skills that translate seamlessly into her real estate career.



Outside of real estate, Justine enjoys reading, traveling, spending time with family and friends, and maintaining a great sense of humor—an attribute her clients truly appreciate during what can be a complex process.



Justine is partnered with Mary Ann Gruntowicz as the Platinum Team of Cummings & Co, because every client deserves that level of service!