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 web site.

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

Here is a 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 Sandpoint, ID
2446.050CSQ
2a446.050100.0STARnet Node 40592 in Oldtown, ID
3446.075CSQ
4446.100100.0STARcamp Node 27046 in Camp Bay, Sagle, Idaho
5446.125CSQ
6446.150CSQSTARbonnersferry Node 27271 in Bonners Ferry, Idaho
7446.175CSQ
8446.200CSQ
9446.225CSQ
10446.250CSQ
11446.275CSQ
12446.300CSQ
13446.325CSQ