RICHFIELD, Ohio, Aug. 4 /PRNewswire-FirstCall/ -- National Interstate Corporation (NASDAQ:NATL) will release its 2005 second quarter results on Monday, August 15, 2005, after the market closes. The earnings release will be available shortly thereafter on NATL's investor relations website at http://invest.nationalinterstate.com/. In conjunction with the earnings release, NATL's results will be discussed in a conference call at 10:00 a.m. EDT on Tuesday, August 16, 2005. There are two communication modes available to listen to the call. Over the Telephone: Telephone access to the conference call and Q and A session will be available by dialing 1-800-901-5213 and providing the confirmation code 75896234. Please dial in 5 to 10 minutes prior to the scheduled starting time. Live on the Internet: The conference call will also be broadcast live over the Internet. To listen to the call via the Internet, access NATL's website, http://invest.nationalinterstate.com/, and follow the instructions at the web cast link. The archived web cast will be available immediately after the call on National Interstate's website. About National Interstate Corporation National Interstate Corporation (NASDAQ:NATL), founded in 1989, is a specialty property and casualty insurance company with a niche orientation and focus on the transportation industry. National Interstate differentiates itself within its markets by offering insurance products and services designed to meet the unique needs of targeted insurance buyers that we believe are underserved by the insurance industry. Our core products include property and casualty insurance for transportation companies, group captive insurance programs for transportation companies that we refer to as our alternative risk transfer operations, specialty personal lines, primarily, recreational vehicle coverage and transportation and general commercial insurance in Hawaii. We offer our products through multiple distribution channels including independent agents and brokers, affiliated agencies and the Internet. Our insurance subsidiaries are rated "A" (Excellent) by A.M. Best Co. Ohio-based National Interstate is a subsidiary of American Financial Group, Inc. (NYSE: AFG) Nasdaq, and is headquartered in Richfield, Ohio, near Cleveland, Ohio. Forward Looking Statements This release may contain forward-looking statements that are subject to risks and uncertainties. Although National Interstate Corporation believes that the expectations reflected in its forward-looking statements are reasonable, actual results could differ materially from those expectations. Important cautionary statements and risk factors that could affect actual results are discussed in materials filed by National Interstate Corporation with the Securities and Exchange Commission. DATASOURCE: National Interstate Corporation CONTACT: Mike Bourgon, VP - Investor Relations of National Interstate Corporation, +1-330-659-8900, or Web site: http://invest.nationalinterstate.com/

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