Niantic is a village in Macon County, Illinois, United States. Its population was 612 at the 2020 census,^[2] down from 707 in 2010. It is included in the Decatur, Illinois Metropolitan Statistical Area.

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Niantic, Illinois
Village
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Location in Macon County, Illinois
Niantic Location in the United States
Coordinates: 39°51′18″N 89°9′56″W
Country	United States
State	Illinois
County	Macon
Township	Niantic
Area [1]
• Total	1.04 sq mi (2.69 km2)
• Land	1.04 sq mi (2.69 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation	601 ft (183 m)
Population  (2020)[2]
• Total	612
• Density	589.03/sq mi (227.38/km2)
Time zone	UTC-6 (CST)
• Summer (DST)	UTC-5 (CDT)
ZIP code	62551
Area code	217
FIPS code	17-52961

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This section does not cite any sources. (September 2018)

Niantic was among the earliest settled townships in the county. In 1825, Joseph Strickling, a native of Ohio, first settled in what is now Niantic Township. He erected the first log cabin in Niantic.

From 1825 to 1840, there were very few permanent settlers. The township's population varied on settlers setting up temporary homes on their way to the American West. The first schoolhouse was a log cabin built in 1847.

The Potawatomi Death Trail ran through Niantic in 1838.

Niantic is located in western Macon County at 39°51′18″N 89°09′56″W.^[3] It is 12 miles (19 km) west of Decatur, the county seat, and 30 miles (48 km) east-northeast of Springfield, the state capital.

According to the U.S. Census Bureau, Niantic has a total area of 1.04 square miles (2.69 km²), all land.^[1] The village drains westward to southwest-flowing tributaries of the Sangamon River.

As of the census^[5] of 2000, there were 738 people, 269 households, and 200 families residing in the village. The population density was 686.7 inhabitants per square mile (265.1/km²). There were 299 housing units at an average density of 278.2 per square mile (107.4/km²). The racial makeup of the village was 99.59% White, 0.14% Native American, and 0.27% from two or more races. Hispanic or Latino people of any race were 0.68% of the population.

There were 269 households, out of which 37.9% had children under the age of 18 living with them, 62.8% were married couples living together, 7.4% had a female householder with no husband present, and 25.3% were non-families. 21.6% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.18.

In the village, the population was spread out, with 31.2% under the age of 18, 7.3% from 18 to 24, 28.7% from 25 to 44, 19.5% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 99.5 males. For every 100 females age 18 and over, there were 94.6 males.

The median income for a household in the village was $41,184, and the median income for a family was $42,500. Males had a median income of $33,750 versus $21,500 for females. The per capita income for the village was $19,448. About 5.7% of families and 7.8% of the population were below the poverty line, including 9.4% of those under age 18 and 9.2% of those age 65 or over.

Niantic is home to Sangamon Valley High School, which is part of Sangamon Valley C.U.S.D. #9.

• Art Phelan, third baseman for the Chicago Cubs and Cincinnati Reds; born in Niantic
• John L. Rotz, a jockey in National Museum of Racing and Hall of Fame; born in Niantic

• Niantic Village Hall and water tower
• Niantic water tower
• Niantic Fire Station
• Niantic grain elevators