Good question! Here's a terrible answer: EVERYWHERE in Fairfax County! Some leagues, such as volleyball, kickball or basketball, may list a specific location. Softball leagues let you choose a preference for which park your team wants to play at.
For all turf leagues (soccer and football), you can choose a region of preference. We'll do our best to consider that preference, but the size of those leagues, and the varying availability season to season of turf fields means that you can't choose a specific field. On any given night, we may be using 15-20 fields, so it all just depends on need.
For 8v8 soccer, the majority of games are at Arrowhead Park and EC Lawrence Park, because those are the primary fields we get allocated that are suitable for short-sided soccer. We sometimes use other fields, but those are the main locations.