Google AdWords recently eliminated the polygon (custom shape) targeting system, and replaced it with a simpler pin point with radius method. Although this method is easier to set-up and visualize, it may not be as precise. However, select exact city location with a radius can still be very effect and efficient. Your options are either to individual select the cities, or points, that you want to target and set appropriate radius, or to select a central point and set the radius high enough to include all the desires points. Whichever option better fits your PPC management targeting strategy, be sure to implement it by the end of 2011, at which time Google will automatically change your polygon targeting into a set point with a radius. An Example of an alternative targeting strategy is pictured below – if more careful one care make it an even closer match.
Old Polygon Targeting – New Alternative Targeting