Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/IL/NIANTIC

Niantic ZIP code, Illinois

The ZIP code for Niantic, IL is 62551, and its area code is 217.

USPS city name
1 ZIP code
Population
671
Area code
217

Niantic in numbers

About 671 people live in Niantic, in 220 households. The median household income is $67,155 a year, 19% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $114,800 (56% below the Illinois median), and median gross rent is $1,066 a month. The median age is 33.8; 8.4% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 25 minutes.

Population671Niantic671
Households220Niantic220
Median age33.8Niantic33.8Illinois39.0US 38.9
Median household income$67,155Niantic$67,155Illinois$83,390US $80,734
Median home value$114,800Niantic$114,800Illinois$263,300US $332,700
Median gross rent$1,066Niantic$1,066Illinois$1,274US $1,413
Bachelor's degree or higher8.4%Niantic8.4%Illinois37.8%US 35.7%
Mean commute24.5 minNiantic24.5 minIllinois27.8 minUS 26.4 min
Population density646 / sq miNiantic646 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Niantic village. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Niantic

ZIP codes with the USPS city name Niantic
ZIP City Type Population Median income Median home
62551 Niantic , IL Standard 820 $69,583 $129,200

Map of Niantic ZIP codes

62551

The ZIP codes of Niantic, IL, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Niantic

The nearest larger towns are Illiopolis (890 people, 4.6 mi), Harristown (1,550 people, 5.6 mi) and Warrensburg (921 people, 7.6 mi).

Towns near Niantic
TownPopulationDistance
Forsyth 3,502 11.8 mi
Decatur 69,815 12.3 mi
Mount Zion 5,660 15.6 mi
Riverton 3,513 19.7 mi
Rochester 3,766 20.4 mi
Taylorville 10,646 21.5 mi
Clinton 6,985 22.9 mi
Lincoln 13,281 23.2 mi
Sherman 4,386 23.4 mi
Springfield 113,330 25.8 mi
Pawnee 2,738 28.6 mi

More nearby: every ZIP code in Macon County · Illinois ZIP codes

Cite this page

zipcodes.pro. “Niantic, IL ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/il/niantic

Underlying data is public domain or openly licensed — sources, vintages and licences.