Hahn & Hahn LLP represents individuals, families, public and private corporations and other business, non-profit and municipal entities in a broad range of matters, including general business and tax advice, corporate and partnership counseling, municipal law, private and public finance, real property and land use matters, environmental compliance, labor and employment law, estate planning, trust and probate matters, family law, commercial transactions, as well as civil and complex litigation before all state and federal courts.

The firm's practice areas are generally grouped under the following departments: Business, Litigation, and Trust & Estates.