Location data on an order is located at order / fulfillmentOrders / assignedLocation / name. The catch is that the locations are assigned after an order is created, so to build a workflow looking at location, you need to either use “order ready to fulfill” as the trigger (template: https://shopify.com/admin/apps/flow/web/v2/editor/templates/ba93d8e6-fa47-49e2-9097-229a2266efc1) or add a wait step after “order created” or “order risk analyzed” to wait about 5 minutes for the order to be assigned to locations.
In the condition you would check for assignedLocation / name to match your location.