I figured I'd start a thread for these languages as well. I did mention the idea of creating one years ago, as well as creating other threads for other groups of languages spoken in South Pacific.
All Micronesian languages are not only Austronesian but apparently also are more closely related to each other than to other Austronesian languages. They are also all spoken in Micronesia, though of course there are other languages spoken there, too (e.g. English, Tagalog, Palauan, and Chamorro). The largest country in Micronesia in terms of land area is Kiribati. However, Guam has a much higher population, and the highest number of Micronesian languages appears to be concentrated in the Federated States of Micronesia.
Wikipedia says, "Micronesian languages are known for their lack of plain labial consonants; they have instead two series, palatalized and labio-velarized labials." Some Micronesian languages (all spoken in the Federated States of Micronesia, if I remember correctly) also have base-60 numeral systems.