Adapazarı is a municipality and the capital district of Sakarya Province, Turkey. Its area is 324 km, and its population 281,489. It covers the c…Adapazarı is a municipality and the capital district of Sakarya Province, Turkey. Its area is 324 km, and its population 281,489. It covers the central and northern part of the agglomeration of Adapazarı and the adjacent countryside.