Most districts have populations between 100 000 and 400 000. Below the district there are constituencies (LC4), sub-counties at LC3 which are local governments, parishes (LC2) and villages (LC1). Both parishes and villages have elected committees. There has been a system of decentralisation to districts and later to sub-counties. Local staff such as agricultural extension officers is part of sub-county administrations. Most development services such as agriculture, health, education, public works, fall under the district with district staff.