Baltimore is an independent city located in the state of Maryland in the United States of America. As of 2005, the population of Baltimore City was 641,943 and the Baltimore-Towson metropolitan area (MSA) had approximately 2.6 million residents. Baltimore is also part of the even bigger Baltimore-Washington Metropolitan Area (CMSA) of approximately 8.1 million residents. Baltimore is the largest city in Maryland; its metropolitan area is the 19th largest in the country. The city is named after the founding proprietor of the Maryland Colony, Lord Baltimore in the Irish House of Lords. Baltimore became the second leading port of entry for immigrants to the United States during the 1800s. The city is a major U.S. seaport, situated closer to major Midwestern markets than any other major seaport on the East Coast. Baltimore himself took his title from Baltimore in County Longford in Ireland, which is the English transliteration of the Irish language Baile an Tí Mór, or "Townland of the big house". Because there is also a Baltimore County surrounding (but not including) the city, it is sometimes referred to as Baltimore City when a clear distinction is desired.