First, make sure that you are able to dissolve, which it sounds like you are not worried about but for the sake of thoroughness I’ll briefly address that. You can dissolve by agreement of all the members, as provided in the operating agreement, or (with certain restrictions such as time and whether you admitted new members within certain times) when the LLC ceases to have members. Careful of the effects of any delinquencies existing prior to dissolution. Addressing that would be beyond the scope of this site though.

Once you know you can dissolve, make sure you file a statement of dissolution with the Secretary of State stating the principal office address and name of the LLC. Also, you obviously have to comply with any requirements in the operating agreement relating to dissolution. Once you have dissolved, you technically still are an LLC but the manager (or a member if there is no manager) cannot carry on any business except for what is appropriate for winding up and liquidating your business and affairs. Be careful about this and be careful about binding the LLC after dissolution. It is allowed but not under all circumstances. Beyond this it is hard to be more specific without more details on your company’s liabilities and reasons for dissociation, etc. You should probably contact someone at the Secretary of State’s Office or at least browse around the website if you are going to attempt this alone. Their website is: http://www.sos.state.co.us/

On that website, there is a line-by-line instruction page: http://www.sos.state.co.us/pubs/business/helpFiles/DISS_LLC_HELP.html

There is also a sample dissolution form here: http://www.sos.state.co.us/pubs/business/sampleForms/DISS_PC.pdf