Municipalities of Greece in the context of "Decentralized administrations of Greece"

Following the implementation on 1 September 2019 of the Kleisthenis I Programme, the administrative divisions of Greece consist of two main levels: the regions and the municipalities. In addition, a number of decentralized administrations overseeing the regions exist as part of the Ministry of the Interior, but are not part of local government. The old prefectures were either abolished and divided or transformed into regional units in 2011 by Kallikratis Plan. The administrative regions are divided into regional units which are further subdivided into municipalities. The Eastern Orthodox monastic community on Mount Athos is an autonomous self-governing entity.

The 74 regional units of Greece are the country's third-level administrative units (counting decentralized administrations as first-level). They are subdivisions of the country's 13 regions, and are further divided into municipalities.

They were introduced as part of the Kallikratis administrative reform on 1 January 2011 and are comparable in area and, on the mainland, coterminous with the "pre-Kallikratis" prefectures of Greece.

Thessaly (/ˈθɛsəli/ THESS-ə-lee; Greek: Θεσσαλία, romanized: Thessalía [θesaˈli.a]; ancient Thessalian: Πετθαλία, Petthalía) is a traditional geographic and modern administrative region of Greece, comprising most of the ancient region of the same name. Before the Greek Dark Ages, Thessaly was known as Aeolia (Ancient Greek: Αἰολία, Aiolía), and appears in Homer's Odyssey.

Thessaly became part of the modern Greek state in 1881, after four and a half centuries of Ottoman rule. Since 1987 it has formed one of the country's 13 regions and is further (since the Kallikratis reform of 2011) sub-divided into five regional units and 25 municipalities. The capital of the region is Larissa. Thessaly lies in northern central Greece and borders the regions of Macedonia to the north, Epirus to the west, Central Greece to the south, and the Aegean Sea to the east. The Thessaly region also includes the Sporades islands.

The dēmarchos (Greek: δήμαρχος, lit. 'archon of the deme'; plural δήμαρχοι, dēmarchoi), anglicized as Demarch, is a title historically given to officials related to civic administration. In ancient Athens the title was given to the elected chief magistrate of each of the demes of Attica. In later literature, the term was used as a translation of the Roman office of tribunus plebis. In the Byzantine Empire the dēmarchos was the leader of one of the racing factions (then known as "demes") of the Hippodrome of Constantinople. Largely concerned with ceremonial in the early centuries, from the 11th century the title was applied to various administrative positions in Constantinople, until the end of the empire. In modern usage, the term is used for the mayor of a municipality.

Ypati (Greek: Υπάτη) is a village and a former municipality in Phthiotis, central peninsular Greece. Since the 2011 local government reform it is part of the municipality of Lamia, of which it is a municipal unit. The municipal unit has an area of 257.504 km. In 2021 its population was 3,537 for the municipal unit, and 440 for the settlement of Ypati itself. The town has a long history, being founded at the turn of the 5th/4th century BC as the capital of the Aenianes. During the Roman period the town prospered and was regarded as the chief city of Thessaly, as well as a bishopric. It was probably abandoned in the 7th century as a result of the Slavic invasions, but was re-established by the 9th century as Neopatras. The town became prominent as a metropolitan see and was the capital of the Greek principality of Thessaly in 1268–1318 and of the Catalan Duchy of Neopatras from 1319 to 1391. It was conquered by the Ottomans in the early 15th century and remained under Ottoman rule until the Greek War of Independence.