US Post Office is located at 511 Coyle Ave, Cullen, LA. This business specializes in Post Offices. US Post Office is open Mon, 8:05am-4pm; Tue, 8:05am-4pm; Wed, 8:05am-4pm; Thu, 8:05am-4pm; Fri, 8:05am-4pm; Sat, Closed; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.