Niantic Illinois ZIP Codes
Niantic holds a single ZIP code.
Every ZIP code in Niantic
| ZIP code | County |
|---|---|
| 62551 | Macon County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Niantic codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Niantic. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Niantic ZIP code begins 625. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 53 ZIP codes, so Niantic accounts for 2% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Niantic
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Niantic occupies.
Niantic Illinois area codes in full →
Where Niantic's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Niantic
| City | Distance | ZIP codes |
|---|---|---|
| Illiopolis Illinois ZIP codes | 4.6 mi | 1 ZIP code |
| Harristown Illinois ZIP codes | 5.6 mi | 1 ZIP code |
| Warrensburg Illinois ZIP codes | 7.6 mi | 1 ZIP code |
| Latham Illinois ZIP codes | 7.8 mi | 1 ZIP code |
| Mount Auburn Illinois ZIP codes | 7.9 mi | 1 ZIP code |
| Blue Mound Illinois ZIP codes | 11 mi | 1 ZIP code |
| Forsyth Illinois ZIP codes | 12 mi | 1 ZIP code |
| Decatur Illinois ZIP codes | 12 mi | 6 ZIP codes |
Straight-line distance between place reference points, not driving distance.