Niantic, IL ZIP code
The ZIP code for Niantic, Illinois is 62551. It is in Macon County.
- Population in these ZIPs
- 820
- Avg. median income
- $69,600population-weighted
- Typical home value
- $135,800population-weighted
- Metro area
- Decatur, IL
Loading map…
Click anywhere on the map to see which ZIP code it's in.
Niantic, IL ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 62551 | 820 | $69,583 | $135,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Niantic
- Harristown 3 mi
- Illiopolis 5 mi
- Mount Auburn 7 mi
- Warrensburg 8 mi
- Latham 8 mi
- Boody 8 mi
- Blue Mound 9 mi
- Decatur 9 mi
- Elwin 11 mi
- Mount Pulaski 11 mi
- Buffalo 11 mi
- Forsyth 11 mi
Frequently asked questions
What is the ZIP code for Niantic, IL?
The ZIP code for Niantic, IL is 62551.
What county is Niantic, Illinois in?
Niantic ZIP codes are in Macon County.