Post offices provide daily mail and package delivery, retail postal services, and specialty offerings like passport acceptance and money orders to residents and businesses. There are 4 Post Office locations in Alton, Illinois.

Residents of Alton should check the USPS website or call their nearest branch to confirm current window hours before visiting, as lobby hours with self-service kiosk access often differ from staffed window hours. Larger locations may also offer package pickup lockers accessible 24 hours a day.

List of Alton City, Illinois Post Office

Alton Post Office

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Alton Square Post Office

View Details Call Now (618) 463-4728

Alton Square Post Office

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Foster Post Office

View Details Call Now (660) 832-4823

Foster Post Office

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Upper Alton Post Office

View Details Call Now (618) 462-6014

Upper Alton Post Office

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Residents of Alton can manage many postal needs without visiting in person by using USPS.com to track packages, submit change of address requests, schedule free package pickups, and purchase postage. When visiting a post office for passport acceptance or certified mail, bring appropriate ID and arrive before the window closes as lines can be longer near midday and end of month.

You may also find Post Office locations in nearby cities including Bethalto, Edwardsville, Elsah.