National Interstate Corporation Announces Earnings Conference Call and Web Cast

RICHFIELD, Ohio, Oct. 19, 2011 (GLOBE NEWSWIRE) -- National Interstate
Corporation (Nasdaq:NATL) announced today that the Company will release its 2011
third quarter results after the market closes on Tuesday, November 1, 2011. The
earnings release will be available shortly thereafter on the Company's investor
relations website at http://invest.natl.com. In conjunction with the earnings
release, third quarter results will be discussed via conference call at 10:00
a.m. Eastern Time on Wednesday, November 2, 2011.

There are two communication modes available to listen to the call. Telephone
access to the conference call and Q and A session will be available by dialing
888-713-8566 and providing the confirmation code 88357105. Please dial in 5 to
10 minutes prior to the scheduled starting time. The conference call will be
broadcast live over the Internet. To listen to the call via the Internet, access
our website at http://invest.natl.com and follow the instructions at the web
cast link. The archived web cast will be available shortly after the call on our
website.

About National Interstate Corporation

National Interstate Corporation (Nasdaq:NATL), founded in 1989, is the holding
company for a specialty property-casualty insurance group which differentiates
itself by offering products and services designed to meet the unique needs of
niche markets. Products include insurance for passenger, truck and moving and
storage transportation companies, alternative risk transfer, or captive programs
for commercial risks, specialty personal lines products focused primarily on
recreational vehicle owners and small commercial vehicle accounts, and
transportation and general commercial insurance in Hawaii and Alaska. The
Company's insurance subsidiaries, including the three primary insurers, National
Interstate Insurance Company, Vanliner Insurance Company and Triumphe Casualty
Company, are rated "A" (Excellent) by A.M. Best Company. Headquartered in
Richfield, Ohio, National Interstate is an independently operated subsidiary of
Great American Insurance Company, a property-casualty subsidiary of American
Financial Group, Inc. (NYSE:AFG) (Nasdaq:AFG).

CONTACT: Tanya Inama
National Interstate Corporation
877-837-0339
investorrelations@nationalinterstate.com