The Northeastern United States is a region of the United States as defined by the United States Census Bureau.

The region comprises nine states: the New England states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont; and the Mid-Atlantic states of New Jersey, New York and Pennsylvania. The Census Bureau regions are "widely used...for data collection and analysis." Other definitions agree. The Uniform Crime Reports of the Federal Bureau of Investigation (FBI) and the National Energy Modeling System both use the Census definitions of the Northeast.Gale's almanac of associations and regional, state, and local organizations also takes the same nine states as comprising the Northeast.

The region accounts for approximately 25% of U.S. gross domestic product as of 2007. As of the 2010 Census, the population of the region totaled 55,317,240.

The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.

At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.