Most places in the US use 25 KHz channels on the 70cm band.  I’m told that there are some places that use 20 KHz channels.  There is good information on this at the Ham Radio School website.

Here is a chart of the channels that I’ve come up with.  We could just as easily use channels below 446.000, but I should hope this is plenty.

70cm Simplex Channel List

This is a partial list of 70cm simplex channels to be used in my local region.
Channel #FrequencyToneUse
0446.000CSQNational Simplex Calling Frequency
1446.025CSQ
1a446.025100.0STARnet Node 27006 in Spokane Valley, WA
2446.050CSQ
2a446.050100.0
3446.075CSQ
4446.100100.0
5446.125CSQ
6446.150CSQN7JCT Pi-Star in Spokane Valley, WA
7446.175CSQ
8446.200CSQ
9446.225CSQ
10446.250CSQ
11446.275CSQ
12446.300CSQ
13446.325CSQ