Springfield is a city in Western New England, and the seat of Hampden County, Massachusetts, United States. Springfield sits on the eastern bank of the Connecticut River near its confluence with three rivers; the western Westfield River, the eastern Chicopee River, and the eastern Mill River. As of the 2010 Census, the city's population was 153,060. Metropolitan Springfield, as one of two metropolitan areas in Massachusetts (the other being Greater Boston), had an estimated population of 698,903 as of 2009.
Located in the fertile Connecticut River Valley, surrounded by mountains, bluffs, and rolling hills in all cardinal directions, Springfield sits on the eastern bank of the Connecticut River, near its confluence with two major tributary rivers - the western Westfield River, which flows into the Connecticut opposite Springfield's South End Bridge; and the eastern Chicopee River, which flows into the Connecticut less than 0.5 square miles (1.3 km2) miles north of Springfield, in the city of Chicopee, (which constituted one of Springfield's most populous neighborhoods until it separated and became an independent municipality in 1852.) The Connecticut state-line sits only 4 miles (6 km) south of Springfield, beside the wealthy suburb of Longmeadow, which itself separated from Springfield in 1783. Springfield's densely urban Metro Center district surrounding Main Street is relatively flat, and follows the north-south trajectory of the Connecticut River; however, as one moves eastward, the city becomes increasingly hilly.
As of the 2010 Census, there were 153,060 people residing in the City of Springfield. This figure does not include many of the 17,000-plus undergraduate and graduate university students who reside in Springfield during the academic year.