Itbayat, officially the Municipality of Itbayat,, is a 5th class municipality in the province of Batanes, Philippines. In the 2020 census, it had a pop…Itbayat, officially the Municipality of Itbayat,, is a 5th class municipality in the province of Batanes, Philippines. In the 2020 census, it had a population of 3,128 people. Itbayat is the country's northernmost municipality, located 156 kilometers from the southernmost tip of Taiwan.