An orderbot's filter is conditional logic that looks at an order to see if it matches your desired criteria. Skubana allows you to set multiple attributes using an AND qualifier, so you are able to apply orderbots to orders with a very specific attribute, completely autonomously.
One way to get more precise with your fulfillment routing would be to create Orderbots that apply based on zip code ranges. The range would need to be broken down into two filters at the top of your Orderbot. This allows you to be even more granular with your fulfillment routing when compared to the 'state' filter in your Orderbots.