define multiple variables on jacascript : I am struggling to define multiple variables:

var city_NAME = ("Birmingham" , "London"); // 


**various code i cannt share**



if(thisLoc.getName() == City_NAME) {

The issue solely lies on the:
**var city_NAME = ("Birmingham" , "London"); //**  
because it is only printing out the SECOND city (london)

Any help would be appreciated