There are 2 Post Offices in Niantic, Illinois, serving a population of 501 people in an area of 2 square miles. There is 1 Post Office per 250 people, and 1 Post Office per square mile.
In Illinois, Niantic is ranked 266th of 1547 cities in Post Offices per capita, and 361st of 1547 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Niantic Post Offices.
US Post Office 155 East Lewis Street Niantic, IL
United States Postal Service 155 East Lewis Street Niantic, IL Mailbox Rental, Postal Services