The official CB channels are:
Channel Frequency Common Use
1 26.965 MHz
2 26.975
3 26.985 Unofficial Marine Channel
4 27.005
5 27.015
6 27.025
7 27.035
8 27.055
9 27.065 Emergency/Traveler Assistance
10 27.075
11 27.085 Old Official Calling Channel
12 27.105
13 27.115 Unofficial Marine Channel
14 27.125 Very Common Walkie-Talkie Channel
15 27.135
16 27.155 Old SSB Channel
17 27.165
18 27.175 Old SSB Channel
19 27.185 Truckers Channel
20 27.205
21 27.215
22 27.225
23 27.255 Shared with Radio Control Devices
24 27.235
25 27.245
26 27.265
27 27.275
28 27.285
29 27.295
30 27.305
31 27.315
32 27.325
33 27.335
34 27.345
35 27.355 SSB
36 27.365 SSB
37 27.375 SSB
38 27.385 SSB
39 27.395 SSB
40 27.405 SSB
There are also the "
freeband" channels that run from 26.000 MHz up to CB channel 1, and from channel 40 up to the low end of the 10-meter
ham band (28.000 MHz). It is illegal to operate on these frequencies, but
FCC enforcment is pretty lax.
Maximum power on the citizens band is 4 watts for amplitude modulation (
AM) mode, and 12 watts
peak envelope power for
single-sideband (
SSB) modes. Channels for SSB use are designated by informal agreement. All modes are legal in all channels, but you will get
flamed crisper than a slashdot
karma-whore for using the "wrong" mode for that channel.