We are planning an out of town wedding.  Do we need to send save the date cards?  Are they sent to all those invited to the wedding?

Yes, you're absolutely right about needing to send save-the-date cards for an out-of-town wedding. All of your guests and bridal party members must receive one, just to be on the safe side. The biggest problems in weddings come from the planners making assumptions that others know what's going on, so this is a smart move to keep everyone on the same page. Keep in mind that your guests might have children in school at that time, or work obligations, big exams or conferences to prepare for, or any number of additional issues that will require some advance notification. The expense for this sending is well worth it!!