<Table> <Tr> <Td> </Td> <Td> This article needs to be updated . Please update this article to reflect recent events or newly available information . (January 2017) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs to be updated . Please update this article to reflect recent events or newly available information . (January 2017) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Economic Community of West African States <Ul> <Li> Communauté économique des États de l'Afrique de l'Ouest (French) </Li> <Li> Comunidade Económica dos Estados da África Ocidental (Portuguese) </Li> </Ul> </Th> </Tr> <Tr> <Td_colspan="2"> Emblem </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> <P> Abuja, Nigeria </P> 9 ° 2 ′ 35" N 7 ° 31 ′ 32" E ﻿ / ﻿ 9.04306 ° N 7.52556 ° E ﻿ / 9.04306; 7.52556 </Td> </Tr> <Tr> <Th> Official languages </Th> <Td> <Ul> <Li> French </Li> <Li> English </Li> <Li> Portuguese </Li> </Ul> </Td> </Tr> <Tr> <Th> Membership </Th> <Td> 15 members (show) <Ul> <Li> Benin </Li> <Li> Burkina Faso </Li> <Li> Cape Verde </Li> <Li> The Gambia </Li> <Li> Ghana </Li> <Li> Guinea </Li> <Li> Guinea - Bissau </Li> <Li> Ivory Coast </Li> <Li> Liberia </Li> <Li> Mali </Li> <Li> Niger </Li> <Li> Nigeria </Li> <Li> Senegal </Li> <Li> Sierra Leone </Li> <Li> Togo </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> Leaders </Th> </Tr> <Tr> <Th> Chairman </Th> <Td> Faure Gnassingbe </Td> </Tr> <Tr> <Th> President of the Commission </Th> <Td> Marcel Alain de Souza </Td> </Tr> <Tr> <Th> Speaker of the Parliament </Th> <Td> Moustapha Cissé Lô </Td> </Tr> <Tr> <Th_colspan="2"> Establishment </Th> </Tr> <Tr> <Th> Treaty of Lagos </Th> <Td> 28 May 1975 </Td> </Tr> <Tr> <Th_colspan="2"> Area </Th> </Tr> <Tr> <Th> Total </Th> <Td> 5,114,162 km (1,974,589 sq mi) (7th) </Td> </Tr> <Tr> <Th_colspan="2"> Population </Th> </Tr> <Tr> <Th> 2015 estimate </Th> <Td> 349,154,000 (3rd) </Td> </Tr> <Tr> <Th> Density </Th> <Td> 68.3 / km (176.9 / sq mi) </Td> </Tr> <Tr> <Th> GDP (PPP) </Th> <Td> 2015 estimate </Td> </Tr> <Tr> <Th> Total </Th> <Td> US $1.483 trillion (18th) </Td> </Tr> <Tr> <Th> Per capita </Th> <Td> US $4,247 </Td> </Tr> <Tr> <Th> GDP (nominal) </Th> <Td> estimate </Td> </Tr> <Tr> <Th> Total </Th> <Td> <P> $675 billion </P> 2015 (21st) </Td> </Tr> <Tr> <Th> Per capita </Th> <Td> $1,985 </Td> </Tr> <Tr> <Th> Currency </Th> <Td> <Ul> <Li> Escudo (CVE) </Li> <Li> Cedi (GHS) </Li> <Li> Dalasi (GMD) </Li> <Li> Franc (GNF) </Li> <Li> Dollar (LRD) </Li> <Li> Naira (NGN) </Li> <Li> Leone (SLL) </Li> <Li> W. African CFA franc (XOF) </Li> </Ul> </Td> </Tr> <Tr> <Th> Time zone </Th> <Td> (UTC + 0 to + 1) </Td> </Tr> <Tr> <Td_colspan="2"> Website http://www.ecowas.int/ </Td> </Tr> <Tr> <Td_colspan="2"> <Ol> <Li> If considered as a single entity . </Li> <Li> To be replaced by the eco . </Li> <Li> Liberia and Sierra Leone have expressed an interest in joining the eco . </Li> </Ol> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Economic Community of West African States <Ul> <Li> Communauté économique des États de l'Afrique de l'Ouest (French) </Li> <Li> Comunidade Económica dos Estados da África Ocidental (Portuguese) </Li> </Ul> </Th> </Tr>

Where is the head quarter of ecowas situated
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