District in Marmara, Turkey
Official logo of İzmit
Emblem of İzmit District
40°45′56″N 29°56′26″E / 40.76556°N 29.94056°E / 40.76556; 29.94056Coordinates: 40°45′56″N 29°56′26″E / 40.76556°N 29.94056°E / 40.76556; 29.94056CountryTurkeyRegionMarmaraProvinceKocaeliGovernment
 • MayorFatma Kaplan Hürriyet (CHP)Area • Urban
480 km2 (190 sq mi) • Metro
1,890 km2 (730 sq mi)Population
 (31/12/2021 estimation[2])[3]
 • District2,033,441 • Urban
367,990 • Urban density770/km2 (2,000/sq mi) • Metro
1,111,789 • Metro density590/km2 (1,500/sq mi)Time zoneUTC+3 (TRT)Postal code
Area code(+90) 262Licence plate41WebsiteKocaeli Metropolitan

İzmit (Turkish pronunciation: [ˈizmit]) is a district and the central district of Kocaeli province, Turkey. It is located at the Gulf of İzmit in the Sea of Marmara, about 100 km (62 mi) east of Istanbul, on the northwestern part of Anatolia. As of the last estimation (made on 31 December 2021), the city center had a population of 367,990. Kocaeli province (including rural areas) had a population of 2,033,441 inhabitants, of whom approximately 1.2 million lived in the largely urban İzmit City metro area made up of Kartepe, Basiksele, Korfez, Golcuk, Derince and Sapanca (in Sakarya Province).[2] Unlike other provinces in Turkey, apart from Istanbul, the whole province is included within the municipality of the metropolitan center.

İzmit was known as Nicomedia (Greek: Νικομήδεια) in antiquity, and was the eastern and most senior capital city of the Roman Empire between 286 and 324, during the Tetrarchy introduced by Diocletian. Following Constantine the Great's victory over co-emperor Licinius at the Battle of Chrysopolis in 324, Nicomedia served as an interim capital city for Constantine between 324 and 330, when he rebuilt and expanded the nearby city of Byzantium as the new Roman capital; formally dedicating it in 330 with the name Nova Roma,[4] before he soon renamed it as Constantinopolis (modern Istanbul).[4] Constantine died at a royal villa near Nicomedia in 337. During the Ottoman Empire, İzmit was the capital of the Sanjak of Kocaeli.


"İzmit" derives from the Ancient Greek name of the city, Nicomedia (Greek: Νικομήδεια), prefixed with εἰς 'to' or 'into' (similarly to İstanbul). Names used in English prior to official Turkish Latinization include Ismid, Iskimid, and Isnikmid.[5]


The geographical location of İzmit is between 40°-41° N and 29°-31° E, surrounded by the Gulf of İzmit at south, Istanbul and the Sea of Marmara at west, the Black Sea at north, and Sakarya at east.

The city is mostly built on hill slopes because of the cramped area, while flat plains surround the gulf, near the sea. This topographic structure divided the city into two parts. The first was created on flat plains, where the city center is located. The railway and highway networks pass from this area which is close to the Sea of Marmara. The second part was built on hills, with many historic houses from the Ottoman period in the old quarters.


Statue of Heracles at the Kocaeli Museum in İzmit
Bust of Socrates at the Kocaeli Museum in İzmit
Statues depicting the seasons summer, winter and autumn (from left to right) at the Kocaeli Museum

In Antiquity, the city in Greek was called Astacus or Olbia (founded 712 BC). After being destroyed, it was rebuilt and founded by Nicomedes I of Bithynia in 264 BC under the name of Nicomedia. It remained one of the most important cities in northwestern Asia Minor.

Carthaginian general and statesman Hannibal came to Nicomedia in his final years and committed suicide in nearby Libyssa (modern Gebze), in a date between 183 and 181 BC.

The historian Arrian was born in Nicomedia, which was the metropolis of Bithynia under the Roman Empire (see also Nicaea).

In 286 AD, Roman emperor Diocletian made Nicomedia the eastern capital city of the Roman Empire, when he introduced the Tetrarchy system. Nicomedia remained as the eastern (and most senior) capital of the Roman Empire until Licinius was defeated by Constantine the Great in 324. Constantine mainly resided in Nicomedia as his interim capital city for the next six years; until in 330 he declared the nearby Byzantium as Nova Roma, which eventually became known as Constantinople (modern Istanbul). Constantine died at a royal villa in the vicinity of Nicomedia on 22 May 337. Owing to its position at the convergence of the Asiatic roads leading to the new capital, Nicomedia retained its importance even after the foundation of Constantinople.

In 451, the local bishopric was promoted to a Metropolitan see under the jurisdiction of the Ecumenical Patriarchate of Constantinople.[6]

Nicomedia remained under Byzantine rule until the late 11th century, when it was captured by Seljuk Turks. However, the city soon returned to Byzantine sovereignty as a consequence of the successes of the First Crusade. After the sack of Constantinople in 1204, during the Fourth Crusade, the city of Nicomedia, with most of the Bithynia province, became a part of the Latin Empire. It was recaptured by the Byzantines around 1235 and stayed within Byzantine borders until the first half of the 14th century. The city was conquered by the Ottoman Turks in 1337. Byzantine rule was restored after the Battle of Ankara in 1402, during the Ottoman Interregnum; but the Ottomans reconquered the city in 1419. Under Ottoman rule, it was the capital of the Sanjak of Kocaeli.

In the early 20th century, it remained the seat of a pasha, a Greek metropolitan, and an Armenian archbishop.[5]

Mustafa Kemal Atatürk (middle) in İzmit, June 1922

İzmit was occupied by the United Kingdom on 6 July 1920, during the Turkish War of Independence. The British left it to Greece on 27 October 1920. İzmit was re-taken by the Turks on 28 June 1921.[7] As of 1920, the British reported that the city had a population of about 13,000.[8] In 1920–1921 atrocities were committed in the city and its surroundings during the Greco-Turkish War (1919–1922) against the civilian population. An Allied report (on 1 June 1921) stated that a large number of excesses were committed by both sides during the last year, while the Turkish atrocities in the Izmit peninsula "have been more considerable and ferocious than those on the part of the Greeks".[7][9][10]

The 7.6 Mwearthquake of 17 August 1999 devastated the region with a maximum Mercalli intensity of IX (Violent). The shock killed more than 17,000 people and left half a million homeless. It took several years for the city to recover from this disaster, and traces of the earthquake remain visible.

Main sights

The Kasr-ı Hümayun in İzmit is a hunting pavilion built by the Ottoman Sultan Abdülaziz (r. 1861–1876)[11]

There are numerous tourist attractions in the city center and its adjacent region, such as:

  • remains of the ancient Acropolis, Agora, Amphitheater, Nymphaeum, Necropolis
  • the Demeter Temple
  • the Hellenistic Üçtepeler Mound King Tombs
  • Roman city walls, aqueducts and cisterns
  • parts of the Temple of Augustus
  • parts of the Palace and Arsenal of Diocletian
  • the Byzantine fortress at the core of the Roman city walls
  • Orhan Gazi Mosque (1333)
  • the 14th century Süleyman Paşa Hamam
  • the 16th century Imaret Mosque and Pertev Paşa Mosque (1580), designed by the Ottoman chief architect Mimar Sinan
  • Pertev Paşa Fountain (1571)
  • the 16th century Mehmed Bey Hamam
  • Saatçi Ali Efendi Mansion (1776)
  • Tüysüz Fountain (1782)
  • the early 19th century Fevziye Mosque
  • Kapanca Sokağı Fountain and Canfeda Kethüda Kadın Fountain (1827)
  • Sırrı Paşa Mansion (mid-19th century)
  • Kasr-ı Hümayun Palace
  • French Theological School
  • Redif Barracks (1863)
  • İzmit Clock Tower (1901)
  • Kocaeli Museum
  • SEKA Paper Museum
  • Fethiye Street


Kocaeli Central Bank Building
Kocaeli Press Museum
An old mansion in İzmit

İzmit has a history as a port city. As of 1913, the Turkish government had been working to privatize the port. At that time, Vickers built a temporary dock, bringing a small export business to the area. The British described the port as having little business as of 1920.[8]

During the sanjak period of İzmit, the forested regions of the area were devastated by deforestation. The wood in the region of İzmit was used to produce charcoal, primarily.[12] During the 1920s, the area was also known for manufacturing linen. Factories were rare during that time, so most linen was handmade. It was described as being "coarse" and as being in high demand in Turkey as of 1920. İzmit was the home of two Turkish Army and Navy uniform factories. One made fez hats and the other made cloth. The area made carpet and embroidery, made by mainly Christian women.[13]

İzmit has a large oil refinery and major paper and cement factories. Ford Motor Company has a plant here in a joint venture with Otosan, assembling the Transit/Tourneo (including the new V362 Transit/Tourneo Custom since late 2012) and Transit/Tourneo Connect vans. With Ford's Southampton Assembly Plant closing in July 2013, and the launch of the new Otosan only V363 Transit in 2014, İzmit will be the sole producer of Ford Transit vans for Europe. It is also a transportation hub, being on the main highway and railway lines between Istanbul and Ankara and having a major port.

İzmit Ethnography Museum

In the past few years the province has developed into a growth point for the Turkish automotive industry, receiving investments from Ford, Hyundai, Honda and Isuzu. Tyre and rubber products are produced to world-class standard (Goodyear, Pirelli, Lassa and Bridgestone). As of today, Kocaeli province has attracted more than 1200 industrial investments, 108 of which have been established with international capital. Turkey's largest enterprise, the Tüpraş Petroleum Refinery Plant, is in Kocaeli, containing altogether 27% of the national chemical products industry, including petrochemical products. Eighteen of the 100 largest enterprises of Turkey are in Kocaeli and contribute to around 17%-18% of the national tax revenues.

Atatürk and Redif Museum

Financial Times affiliated Foreign Direct Investment magazine nominated Kocaeli (the province of which İzmit is the capital) among the 25 European Regions of the Future for 2006–2007.[14] The city was chosen along with Adana for Turkey, which scored the highest points for cost effectiveness against Kocaeli's wider infrastructure, while Adana and Kocaeli tied on points for human resources and quality of life.

The famous Turkish traditional sweet Pişmaniye is a product of İzmit and the Kocaeli Province.


İzmit Clock Tower, with the Mimar Sinan Bridge and the coastal highway seen in the background.
Mimar Sinan Bridge in İzmit
A historic railway station in Izmit
A ferry at the Gulf of İzmit

Located along the commercially-active Black Sea and Marmara Sea shorelines, Kocaeli boasts 5 ports and 35 industrial docks, making it an important communications center, as well as Anatolia's farthest inland contact point and a gateway to global markets. The main transportation routes, the D100 highway and the Trans European Motorway which connects Europe with Asia, along with railway lines, form an intercontinental passage network. İzmit Central railway station is one of the busiest in Turkey, built in 1977 to replace the original station.

Kocaeli neighbours one of the world's largest metropolitan centers, Istanbul. Its vicinity to Istanbul's two international airports (Sabiha Gökçen International Airport and Atatürk International Airport) which are 45 and 80 km (28 and 50 mi) away, respectively, from İzmit's city center, provides national and international connections.

On 1 March 1958, SS Üsküdar, a small passenger ferry sailing between İzmit and Değirmendere sank due to lodos weather. 272 people died including 38 students and seven crew. 37 passengers and two crew survived the disaster.[15][16][17][18]


Year Total Urban Rural
2008[19] 306.515 287.970 18.545
2009[20] 313.964 293.339 20.625
2010[21] 315.734 294.875 20.859
2011[22] 322.588 300.611 21.977
2012[23] 327.435 302.960 24.475
2013[24] 332.754 332.754
2014[25] 338.710 338.710
2015[26] 347.074 347.074
2016[27] 354.464 354.464
2017[28] 360.409 360.409
2018[29] 363.416 363.416
2019[30] 367.990 367.990


A pre-school building in İzmit

Kocaeli University (KOU) was established in the city in 1992. The university has more than 50,000 students. It has established a department of international relations that monitors Bologna developments closely and oversees KOU's participation in the Erasmus and Leonardo da Vinci student mobility schemes. With membership in the European University Association, KOU is aiming for greater international recognition of its academic work.

The university, while focusing on technical and engineering subjects, offers an extensive selection of courses in social sciences and arts as well. Some steps toward certification by ABET (Accreditation Board for Engineering and Technology) are being taken by the Faculty of Engineering, such as adaptation of course content in engineering majors.


İzmit has a humid subtropical climate (Köppen climate classification: Cfa, Trewartha climate classification: Cf), which is warmer than its surroundings, largely due to its sheltered location in the İzmit Valley, and noticeably wetter, especially during summers, than other locations on the northern Sea of Marmara coast further to the west. Summers are hot and often muggy, the average maximum temperature is around 30 °C (86 °F) in July and August, while winters are cool and wet, the average minimum temperature is slightly below 4 °C (39 °F) in January. Precipitation is high and fairly evenly distributed the year round; it is heaviest in late fall and winter. İzmit has a record high temperature of 44.1 °C (111 °F) in July 2000, which is exceptionally high for the region, and a record low of −18.0 °C (0 °F) in February 1929. Snowfall is fairly common, and İzmit's snow depth record is 90 cm (35 in) in February 1929.

Climate data for İzmit (1991–2020, extremes 1929–2020)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 24.9
Average high °C (°F) 10.0
Daily mean °C (°F) 6.4
Average low °C (°F) 3.5
Record low °C (°F) −13.1
Average precipitation mm (inches) 100.1
Average rainy days 17.87 16.43 15.97 12.70 11.67 9.73 6.83 6.13 9.77 13.30 13.47 18.13 152.0
Mean monthly sunshine hours 77.5 87.6 133.3 180.0 217.0 261.0 288.3 269.7 204.0 139.5 105.0 77.5 2,040.4
Mean daily sunshine hours 2.5 3.1 4.3 6.0 7.0 8.7 9.3 8.7 6.8 4.5 3.5 2.5 5.6
Source: Turkish State Meteorological Service[31]


  • Fevziye Mosque

    Fevziye Mosque

  • İzmit Clock Tower

    İzmit Clock Tower

  • Pertev Paşa Mosque

    Pertev Paşa Mosque

  • Kasr-ı Hümayun

    Kasr-ı Hümayun

  • A view from İzmit's Demiryolu Avenue

    A view from İzmit's Demiryolu Avenue

Historic and modern sites in and around İzmit

Twin towns – sister cities

İzmit is twinned with:[32]


The city's main football club is Kocaelispor, with fans all across the province. The city is also home to women's football team Derince Belediyespor. The multi-sport club Kocaeli B.B. Kağıt S.K. has several sports sections covering a wide range disciplines. Cycling is popular with local team Brisaspor and the Tour of Marmara is hosted.

The city also hosted the following tournaments:

See also

Wikimedia Commons has media related to İzmit.
  • flagTurkey portal


  1. ^ "Area of regions (including lakes), km²". Regional Statistics Database. Turkish Statistical Institute. 2002. Retrieved 5 March 2013.
  2. ^ a b "Turkey: Administrative Division (Provinces and Districts) - Population Statistics, Charts and Map". www.citypopulation.de. Archived from the original on 31 August 2021. Retrieved 12 September 2021.
  3. ^ "Population of province/district centers and towns/villages by districts - 2012". Address Based Population Registration System (ABPRS) Database. Turkish Statistical Institute. Retrieved 27 February 2013.
  4. ^ a b "Istanbul". britannica.com. Encyclopædia Britannica. Archived from the original on 1 April 2009. Retrieved 28 May 2021.
  5. ^ a b Kellogg, Day Otis; Baynes, Thomas Spencer (13 December 1903). "The Encyclopædia Britannica: A-ZYM". Werner. Archived from the original on 21 July 2021. Retrieved 4 January 2021 – via Google Books.
  6. ^ Kiminas, Demetrius (2009). The Ecumenical Patriarchate. Wildside Press LLC. p. 79. ISBN 9781434458766. Archived from the original on 23 October 2021. Retrieved 4 October 2020.
  7. ^ a b Ionian Vision: Greece in Asia Minor, 1919-1922, Michael Llewellyn-Smith, page 215, 1998
  8. ^ a b Prothero, G.W. (1920). Anatolia. London: H.M. Stationery Office. Archived from the original on 29 September 2018. Retrieved 6 September 2013.
  9. ^ Shenk, Robert (2012). America's Black Sea fleet the U.S. Navy amidst war and revolution, 1919-1923. Annapolis, Md.: Naval Institute Press. ISBN 9781612513027. Archived from the original on 23 October 2021. Retrieved 4 October 2020.
  10. ^ Reports on atrocities in the districts of Yalova and Guemlek and in the Ismid Peninsula. 1921. pp. 1–11. Retrieved 15 June 2014.
  11. ^ "Kasr-ı Hümayun Saray Müzesi - Kocaeli". kulturportali.gov.tr. Archived from the original on 30 October 2020. Retrieved 23 March 2021.
  12. ^ Prothero, G.W. (1920). Anatolia. London: H.M. Stationery Office. Archived from the original on 2 December 2013. Retrieved 6 September 2013.
  13. ^ Prothero, G.W. (1920). Anatolia. London: H.M. Stationery Office. p. 109. Archived from the original on 4 February 2014. Retrieved 7 September 2013.
  14. ^ "fDi Magazine: European Regions of the Future". Archived from the original on 11 March 2007. Retrieved 8 May 2006.
  15. ^ Bozoğlu, Ali. "S/S Üsküdar 1927-1958" (in Turkish). Deniz Gazete. Archived from the original on 29 October 2014. Retrieved 22 August 2012.
  16. ^ Gülezer, Soner (15 November 2011). "Batan Üsküdar Vapuru'nun kaptanının mezarı yeniden açıldı". Milliyet (in Turkish). Archived from the original on 23 October 2021. Retrieved 22 August 2012.
  17. ^ "Üsküdar Vapuru faciasının 53. yılı-Cumhuriyet tarihinin en yüksek ölümlü deniz kazası". Sabah (in Turkish). 1 March 2011. Archived from the original on 9 October 2013. Retrieved 22 August 2012.
  18. ^ "Üsküdar Vapuru faciasının 54. yılı..." SkyTürk 360 (in Turkish). 1 March 2012. Retrieved 22 August 2012.
  19. ^ "2008 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 3 November 2012. Retrieved 3 November 2012.
  20. ^ "2009 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 3 November 2012. Retrieved 3 November 2012.
  21. ^ "2010 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 3 November 2012. Retrieved 3 November 2012.
  22. ^ "2011 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 3 November 2012. Retrieved 3 November 2012.
  23. ^ "2012 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 20 February 2013. Retrieved 8 March 2013.
  24. ^ "2013 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 15 February 2014. Retrieved 15 February 2014.
  25. ^ "2014 genel nüfus sayımı verileri". Türkiye İstatistik Kurumu. Archived from the original on 10 February 2015. Retrieved 10 February 2015.
  26. ^ "2015 genel nüfus sayımı verileri" (Doğrudan bir kaynak olmayıp ilgili veriye ulaşmak için sorgulama yapılmalıdır). Türkiye İstatistik Kurumu. Archived from the original on 4 February 2016. Retrieved 13 April 2016.
  27. ^ "2016 genel nüfus sayımı verileri" (Doğrudan bir kaynak olmayıp ilgili veriye ulaşmak için sorgulama yapılmalıdır). Türkiye İstatistik Kurumu. Archived from the original on 4 February 2016. Retrieved 7 March 2017.
  28. ^ "2017 genel nüfus sayımı verileri" (Doğrudan bir kaynak olmayıp ilgili veriye ulaşmak için sorgulama yapılmalıdır). Türkiye İstatistik Kurumu. Archived from the original on 4 February 2016. Retrieved 7 July 2020.
  29. ^ "2018 genel nüfus sayımı verileri" (Doğrudan bir kaynak olmayıp ilgili veriye ulaşmak için sorgulama yapılmalıdır). Türkiye İstatistik Kurumu. Archived from the original on 4 February 2016. Retrieved 7 July 2020.
  30. ^ "2019 genel nüfus sayımı verileri" (Doğrudan bir kaynak olmayıp ilgili veriye ulaşmak için sorgulama yapılmalıdır). Türkiye İstatistik Kurumu. Archived from the original on 4 February 2016. Retrieved 7 July 2020.
  31. ^ "Resmi İstatistikler: İllerimize Ait Mevism Normalleri (1991–2020)" (in Turkish). Turkish State Meteorological Service. Archived from the original on 11 April 2021. Retrieved 11 April 2021.
  32. ^ "Kardeş Şehirler". izmit.bel.tr (in Turkish). İzmit. Archived from the original on 6 February 2020. Retrieved 17 January 2020.

External links

  • Official website of Kocaeli (İzmit) Metropolitan Municipality (in Turkish and English)
  • Photos of Izmit (Nicomedia) and its environs on Pinterest
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Districts of Kocaeli
List of provinces by region
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East Marmara
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Largest cities or towns in Turkey
TÜİK's address-based calculation from December 2017.
Rank Name Province Pop. Rank Name Province Pop.
1 Istanbul Istanbul 14,744,519 11 Mersin Mersin 1,005,455 İzmir
2 Ankara Ankara 4,871,884 12 Urfa Şanlıurfa 921,978
3 İzmir İzmir 2,938,546 13 Eskişehir Eskişehir 752,630
4 Bursa Bursa 2,074,799 14 Denizli Denizli 638,989
5 Adana Adana 1,753,337 15 Kahramanmaraş Kahramanmaraş 632,487
6 Gaziantep Gaziantep 1,663,273 16 Samsun Samsun 625,410
7 Antalya Antalya 1,311,471 17 Malatya Malatya 618,831
8 Konya Konya 1,130,222 18 İzmit Kocaeli 570,077
9 Kayseri Kayseri 1,123,611 19 Adapazarı Sakarya 492,027
10 Diyarbakır Diyarbakır 1,047,286 20 Erzurum Erzurum 422,389
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