The 1,864 islands in the region I just visited vary in size from big (40 square miles) to small. To count as an island a place has to be above sea-level all year round and have at least one living tree on it.
Most of the islands I saw have only one or two homes on them. I laughed at one called "Just Room Enough Island" which is true to its name; it's only 3,300 square feet and amazingly has a full-sized house on it. The owner says "One misstep and you're swimming."
Would you live there?!