US Post Office is located at 700 Plaza Dr # A, Secaucus, NJ. This business specializes in Post Offices. US Post Office is open Mon, 10am-2pm; Tue, 10am-2pm; Wed, 10am-2pm; Thu, 10am-2pm; Fri, 10am-2pm; Sat, Closed; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.