There are 2 Post Offices in Ottawa, Illinois, serving a population of 18,779 people in an area of 12 square miles. There is 1 Post Office per 9,389 people, and 1 Post Office per 5 square miles.
In Illinois, Ottawa is ranked 976th of 1547 cities in Post Offices per capita, and 1,012nd of 1547 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Ottawa Post Offices.
United States Postal Service 750 East Etna Road Ottawa, IL Mailing Service, Postal Services
United States Postal Service 405 West Main Street Ottawa, IL Mailing Service, Postal Services