There are 2 Post Offices in Waterloo, Illinois, serving a population of 10,202 people in an area of 9 square miles. There is 1 Post Office per 5,101 people, and 1 Post Office per 4 square miles.
In Illinois, Waterloo is ranked 876th of 1547 cities in Post Offices per capita, and 936th of 1547 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Waterloo Post Offices.
United States Postal Service 305 East 3rd Street Waterloo, IL Mailing Service, Postal Services
Waterloo Park District 316 North Library Street Waterloo, IL