phone number: fax number: emergency response program: 928-428-0110: 928-428-8074: public health: 928-428-0110: 928-428-8074
Springfield, Illinois. Springfield is the capital of the U.S. state of Illinois and the county seat of Sangamon County. The city's population of 116,250 as of the 2010 U.S. Census makes it the state's sixth most populous city. It is the largest city in central Illinois.
Population of Springfield, IL. Last official estimated population of Springfield city (Sangamon County**, Illinois state) was 116,809 (year 2014)[1]. This was 0.037% of total US population and 0.91% of total Illinois state population. Area of Springfield city is 66.2 miÂ² (=171.4 kmÂ²)[6], in this year population density was 1,764.94 p/miÂ².