Abuja large and growing immigrant community consisting mainly of nationals from the ECOWAS sub-region. The city has been undergoing a rapid pace of physical development over the last fifteen years. Abuja is served by the Nigerian Postal Service which maintains postal codes, street names and zones. Nnamdi Azikiwe International Airport is the main airport serving Abuja and the surrounding capital region. It was named after Nigeria's first president, Nnamdi Azikiwe. The airport has international and domestic terminals. Abuja is also linked to Nasarawa, Plateau, Benue and Northeast Nigeria by the A234 Federal Highway, which starts from the city as the Goodluck
Abuja Jonathan expressway, some portions of which are still under construction. A direct highway link to Minna in Niger State is still under construction. The A2 expressway links Abuja with Kaduna in the north and Lokoja in the south. There are also other highway links with the outlying region, such as that linking the suburb of Dutse Alhaji with the Lower Usuma and Gurara Dams, which supply water to the city. Abuja is on the route of the planned Lagos–Kano Standard Gauge Railway, which has been completed between Abuja and Kaduna. Trains for Kaduna depart from the Idu Railway Station in