Almost every filter allows you to sort the values manually. You can do this by navigating to the filter template you're using and then opening the filter that you want to sort the values of. In the Basic options tab, you will find the Sorting of values section. You'll see various sorting options, including Manual. When you select this option, an extra button appears:
Click this button to open the manual sorting popup. In the example below, we're placing three values on top:
Select the values you want to place on top manually. In this example, we've used Arlington, Beacon Hill, and Plantation,
Next, you can choose how you want to sort the values that haven't been selected. You can this based on product amount, alphabetical order, reverse alphabetical order, or numerical values from text. When a property gets a new value, it will be sorted based on the option selected here.
Once you're ready, Save the options and Save the filter template. The sorting will start working once you've run a publish task.