Welcome to the forums amber380!
You're question is rather vague. If you're talking about Denver County and DIA, then OC is strictly a no-no. Concealed carry in Denver carry is fine with a valid carry permit and ID. CC in DIA is technically legal (with the aforementioned credentials), but only in NON secure zones. If you try to go thru a security checkpoint or a marked secure zone while CCing, your posterior will learn a "whole" new meaning of infringement!
Counties in Colorado cannot ban or forbid CC with credentials due to state preemption. The only places that you cannot CC legally in are public schools, govt buildings with stationary screening devices/equipment, etc, etc. There are plenty of resources on OpenCarry.orgs homepage, and in the Colorado forums.
Here's a couple extra links to heighten the learning curve in CO:
Open Carry of course: www.opencarry.org
Rocky Mountain Gun Owners www.rmgo.org
CBI website as per CC/OC laws: http://cbi.state.co.us/ccw/relatedstats.asp
Concealed Carry info: www.carryconcealed.net
IANAL!!!!!!!!!!!!!! So do you're research, be safe, carry proud.