Passion. Experience. Diligence.

Jeanmarie P. Costello is your trusted ally in navigating legal complexities with empathy and expertise. Based in Riverhead, NY, our law office provides expertise and representation in matrimonial and family law, wills and estates, and real estate matters to all of Suffolk County.

Whether you're facing a divorce, need estate planning assistance, or require guidance in real estate transactions, we are here to provide personalized and comprehensive legal solutions tailored to your unique needs. Trust Jeanmarie P. Costello for compassionate advocacy and dedicated representation, every step of the way.

  • Jeanmarie's legal acumen is widely recognized. She has been named "Pro Bono Attorney of the Month" three times by the Suffolk County Bar Association for her invaluable contributions to indigent clients. Her extensive experience in matrimonial and family law matters, including contested and uncontested divorces, custody disputes, and pre-nuptial agreements, reflects her dedication to protecting clients' rights and achieving favorable outcomes.

  • Jeanmarie's legal journey is marked by her commitment to excellence and service. She has served on the Grievance Committee for the Tenth Judicial District since 2016, displaying her integrity and dedication to upholding legal standards. Her reappointment in 2019 for an additional three-year term speaks volumes about her expertise and trustworthiness.

    Her involvement in the Town of Riverhead Board of Ethics showcases her longstanding commitment to ethical practices and community values. Jeanmarie's contributions extend beyond legal realms; she actively engages in community service, serving as Treasurer of the Riverhead Community Awareness Program (CAP), a past president and trustee of the Riverhead Free Library, and a board member of Aid to Developmentally Disabled.