A simple Yahoo! search for "us amateur radio band plan" would have given you
numerous results.

According to Kenwood's chart:

Digital is used on the following:
28100 - 28200
21025 - 21200 (Also CW)
18068 - 18110 (Also CW)
14025 - 14150 (also CW)
7025 - 7150 (also CW)
3525 - 3750 (also CW)

Hope that helps. Also, try that search I mentioned.
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73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com