Geographical area codes start with the digit 2. There are currently one, two and three digit area codes. The only two digit area code is 21 for the Athens Metropolitan area, three digit codes are used for the cities Thessaloniki, Patras, Larissa, Heraklion, Kavala, Tripoli. The rest of the codes are four-digit codes.

Generally speaking the second digit of a geographical area code signifies a broader geographical area of Greece and this is how area codes are sorted in this article. Two-digit codes are used with eight-digit subscriber numbers, three-digit codes with seven-digit numbers, and four-digit codes with six-digit numbers, such that the full telephone number is always ten digits. Subscriber numbers in most areas start with 0, this is the digit that was inserted between the area code and the subscriber number in order to form the new ten-digit numbering plan back in 2002. Thus many Greeks erroneously think that the area codes include this leading 0, e.g. that Athens area code is 210, while actually Athens area code is 21 and 0 is the first digit of the subscriber number. Subscriber numbers starting with 0 are assigned to the former monopoly OTE. In bigger cities like Athens and Thessaloniki subscriber numbers starting with other digits except 0 are becoming more and more common, especially amongst business subscribers. In this case many people think that the area code is different, e.g. a subscriber number in Athens might start with 211, with people thinking that 211 is a distinct area code than 210, while in reality both numbers are in the 21 area code and the third digit of the number belongs to the subscriber number.

The country calling code of Greece is 30. The international call prefix depends on the country you are calling from, e.g. 00 for most European countries, and 011 from North America.

Country Code: 30
International Call Prefix: 00

During 2001-2002, Greece moved to a closed ten-digit numbering scheme in two stages, with the result that subscribers' numbers changed twice. For example, before the change, a number in Athens would have been dialed as follows:

xxx xxxx (within Athens)
(01) xxx xxxx (within Greece)
+30 1 xxx xxxx (outside Greece)

In 2001, a '0' was added after the area code, which was incorporated into the subscriber's number:

01 0xxx xxxx (within Greece, including Athens)
+30 1 0xxx xxxx (outside Greece)

Finally, in 2002, the leading '0' was changed to a '2' (for geographic numbers) :

 21 0xxx xxxx (within Greece, including Athens)
+30 21 0xxx xxxx (outside Greece)

Mobile phone numbers were similarly prefixed with the digit '6'.

Note that, because of number portability, for both geographical and non-geographical (mobile, toll-free, premium rate) numbers, one cannot be sure about the operator that a number belongs to. Thus for geographical numbers, one cannot be sure that a subscriber number that starts with a 0 is operated by OTE or that a toll free number that starts with 800-11 is operated by OTE, also for mobile networks one cannot say for sure if a 69x actually belongs to the mobile carrier whom it assigned to.

Zone 21: Greater Athens Metropolitan Area

21 - Athens-Piraeus-Eleusis area

Zone 22: Central Greece and the Aegean Islands

222x - Evia

2221 - Chalkida City 2222 - Kymi 2223 - Aliveri 2224 - Karystos 2226 - Edipsos 2227 - Mantoudi 2228 - Psachna 2229 - Eretria

223x - Evrytania and Phthiotis

2231 - Lamia 2232 - Domokos 2233 - Atalanta 2234 - Amfikleia 2235 - Kamena Vourla 2236 - Spercheiada, Makrakomi 2237 - Karpenisi 2238 - Stylida

224x - Dodecanese

2241 - Rhodes, Rhodes City 2242 - Kos and Nisyros islands 2243 - Kalymnos, Astypalaia 2244 - Rhodes Island, Archangelos Area 2245 - Karpathos and Kasos islands 2246 - Rhodes Island, Salakos Area - Chalki, Kastellorizo, Symi and Tilos islands 2247 - Agathonisi, Leros, Leipsoi and Patmos islands

225x - Lesbos, Limnos

2251 - Lesbos, Mytilini Area 2252 - Lesbos, Agiasos Area 2253 - Lesbos, Kalloni Area 2254 - Limnos, Agios Efstratios

226x - Boeotia, eastern Phocis

2261 - Livadia 2262 - Thiva 2263 - Dervenochori 2264 - Thisvi 2265 - Amfissa 2266 - Lidoriki 2267 - Arachova,Distomo 2268 - Aliartos

227x - Chios, Samos and Icaria islands

2271 - Chios, Town Area 2272 - Chios, Kardamyla Area 2273 - Samos 2274 - Chios, Volissos Area - Psara island 2275 - Ikaria, Fournoi island

228x - Cyclades

2281 - Syros, including Kynthos, Serifos and Syros islands 2282 - Andros 2283 - Tinos 2284 - Paros and Sifnos islands 2285 - Amorgos and Naxos islands 2286 - Folegandros, Ios, Santorini and Sikinos islands 2287 - Kimolos and Milos 2288 - Kea Island 2289 - Mykonos

229x - Attica excluding the area that uses 21

2291 - Afidnes 2292 - Lavrio 2293 - Agios Sotiras 2294 - Rafina 2295 - Artemida 2296 - Megara 2297 - Aigina 2298 - Trizinia, Poros isl., Hydra isl., Spetses isl. 2299 - Markopoulo

Zone 23: Central Macedonia and Florina

231 - Thessaloniki

231 - Thessaloniki

232x - Serres prefecture

2321 - Serres 2322 - Nigrita 2323 - Sidirokastro 2324 - Nea Zichni 2325 - Heraklia

233x - Imathia prefecture

2331 - Veria (Verroia) 2332 - Naoussa 2333 - Alexandria 2334 through 2339 - not used

234x - Kilkis prefecture

2341 - Kilkis 2342 2343 - Polukastro 2344 through 2349 - not used

235x - Pieria prefecture

2351 - Katerini 2352 - Litochoro 2353 - Aiginio 2354 through 2359 - not used

237x - Much of Chalkidiki

2371 - Polygyros 2372 - Arnaia 2373 - Nea Moudania 2374 - Potidaia 2375 - Agios Athanasios 2376 - Stratoni 2377 - Ieroni, Mount Athos

238x - Pella and Florina Prefectures

2381 - Edessa 2382 - Giannitsa 2383 - not used 2384 - Aridaia 2385 - Florina 2386 - Amyntaio 2387 through 2389 - not used

239x - parts of Chalkidiki and Thessaloniki prefectures

2391 - Chalkidona 2392 - Peraia 2393 - Lagkadikia 2394 - Lagkadas 2395 - Sochos 2396 - Vasilika 2397 - Asprovalta 2399 - Nea Kallikrateia

234x and 236x are not used.

Zone 24: Thessaly and West Macedonia (excluding Florina)

241 - Larissa area

241 - Larissa (and area)

242x - Magnesia including the Northern Sporades

2421 - Volos 2422 - Almyros 2423 - Kala Nera 2424 - Skopelos 2425 - Velestino 2426 - Zagora 2427 - Skiathos 2428 - Keramidi suburban Volos 2429 - not used

243x - Trikala prefecture

• 2431 - Trikala
• 2432 - Kalampaka
• 2433 - Farkadona
• 2434 - Pyli
• 2435 through 2439 - not used

244x - Karditsa

2441 - Karditsa 2442 - not used 2443 - Sofades 2444 - Palamas 2445 - Mouzaki 2446 through 2449 - not used

246x - West Macedonia excluding the Florina area

2461 - Kozani 2462 - Grevena 2463 - Ptolemaida 2464 - Servia 2465 - Siatista 2466 - not used 2467 - Kastoria 2468 - Neapoli 2469 - not used

249x - Larissa prefecture except for the Larissa area

2491 - Farsala 2492 - Tyrnavos 2493 - Elassona 2494 - Agia 2495 - Makrychori 2496 through 2499 - not used

Zone 25: East Macedonia and Thrace

251 - Kavala area

251: Kavala or Kavalla

252x - Drama prefecture

2521 - Drama 2522 - Prostotsani 2523 - Kato Nevrokopi 2524 through 2559 - not used

253x - Rodhopi prefecture

2531 - Komotini 2352 - Sapes 2533 - Xylagani 2534 - Iasmos 2535 through 2539 - not used

254x- Xanthi prefecture

2541 - Xanthi 2542 - Stavroupoli 2543 2544 - Echinos 2545 through 2549 - not used

255x - Evros Prefecture

2551: Alexandroupolis 2552: Orestiada 2553 - Didymoteicho 2554 - Soufli 2555 - Feres 2556 - Kyprinos

259x - Kavala prefecture except for the Kavala area

2591 - Lekani 2592 - Chrysoupoli 2593 - Thasos 2594 - Eleftheroupoli 2595 through 2599 - not used

Zone 26: West Greece, Ionian Island and Epirus

261 - Patras and Area

261 - Patras (and area)