[6] The municipal unit, Atalanti, is subdivided into the following communities (with constituent villages in parentheses): The capital of Locris province was the city of Opus.

According to Hesiodus and Plutarch, the city was named Opus after the son of Locros and the great-grandson of Deucalion and Pyrrha.

The Locrians from Opus participated in the Trojan War, providing 40 battle ships and four thousand warriors.

In the Middle Helladic period (2100–1600 BC), villages were destroyed (possibly due to the invasion of other Greek tribes).

Its inhabitants main occupations were fishing and agriculture (e.g., the cultivation of wheat, grain, legumes, olives, and grapes, as well as the production of wine).

In 431 BC they fortified the island of Atalanti (or Atalantonisi or Talantonisi) in order to curb the activities of Locrian pirates and to ensure the safety of the coast of Euboea.

The invasion of Sulla prompted many residents of the cities of Locris to abandon their villages during the Roman period (30 BC – 324 AD).

During early Christian times, the Diocess of Opus was founded (Ecumenical Synod or Council in Ephesus in 431 and in Chalcedon in 451 under the Diocese of Corinth.

Following the Fourth Crusade, a Frankish barony was established at Atalanti, under the Catalan noble Pere de Puigpardines.

The main occupations of the inhabitants were agriculture (cereals, viticulture), cultivation of flax, cotton and vegetables, as well as apiaries and livestock.

In low parts of the area, towards the sea, corn, excellent wheat, grapes from which they make a tolerable wine and a few olives grow perfectly.

Kodjabashis (Greek people who represented the Christian communities to the Ottomans) of Talanti were: Lambros Alexandrou (later renamed Evmolpidis), Constantinos Sakellion and Alexis Michalis.

In the Second National Assembly at Astros in 1823, Bishop Neophytos of Talanti and attorney Lambros Alexandrou represented the area.

Mustafa Bey moved from Livadeia to Atalanti with an army of a few thousand men (infantry and horsemen) and surprised the Greek guards.

Dimitris Liakopoulos (from Kato Milia, Pieria) mounted a surprise attack and released the city.

Several institutions were founded in 1831 in Atalanti following the liberation: a primary school (first teacher was D. Manasidis from Samos), a county court, a notary, tax authorities, a fund, a tobacco factory, customs, a forestry organization and a post office.

It included several villages outside of the original Atalanti: Skala, Skenteraga (Megaplatanos), Kyparissi, Kolaka, Bogdanos, Exarchos and Drouskos.

Nicholas Doumpiotis (born in 1866 in New Pella) participated in the Macedonian Struggle (1904–1908) as an officer under the nickname "Captain Amyntas".

In 1927 the Agricultural Credit Cooperative and the Mandolinata were established and a branch of Bank of Athens started to operate within the city.

That same year the Ajax the Locrian sports club successfully organized a local athletic event in Atalanti.

Siblings Charilaos, Demosthenes and George Constantinou from Atalanti established the famous tobacco industry Santé in Athens.

Due to the peculiar soil, and the inability of the Greek state to support the people of Evrytania, after the liberation of 1944 they began to leave their homeland and moved to the surrounding plains like the one in Atalanti and the other urban centers around them.

The current Atalanti's city plan was adopted in 1954 and the Sunday Bank Holiday was established by the Commercial Union in 1957.

A branch of the Emporiki Bank opened, and the educational, cultural and entertainment association Proodos (The Progress) was established (1966).

In 1992, the "Athletic Football Club, Atalanti '92" was founded and the first town's private radio station began to broadcast.

Since 1993 economic migrants from Balkan countries (Albania, Bulgaria, Romania), central Europe (Poland) and Asia (Pakistan, India, China) begin to settle permanently or temporarily in the town.

The 14th Ephorate of Prehistoric and Classical Antiquities was built by the municipality of Atalanti, the Hellenic Ministry of Culture with financial assistance from donors.

It is a shallow coastal lagoon with a narrow opening to the sea that is separated from it by a strip of land connected.

In the early days people used to masquerade and pay visits to friendly homes asking them the classic game of "guess who I am."

The City of Atalanti, in collaboration with the Scala cultural associations organize a great feast where sardines, wine, salad and bread are served free of charge to guests.