Butler County Post Office

Find Butler County Pennsylvania post offices and USPS mailing boxes. Post offices provide information on bulk mail services, domestic mail delivery, international shipping, change of address, mail forwarding, PO boxes, and passport services.


Boyers Post Office 1188 Boyers Road Boyers PA 16020 724-735-2920


Bruin Post Office 105 Washington Street Bruin PA 16022 724-753-2691

Butler Post Office 345 South Main Street Butler PA 16001 724-214-6000

Cabot Post Office 452 Winfield Road Cabot PA 16023 724-352-2113

Callery Post Office 172 Railroad Street Evans City PA 16033 724-538-3801

Chicora Post Office 132 West Slippery Rock Street Chicora PA 16025 724-445-2011

Connoquenessing Post Office 175 Connoquenessing Main St Connoquenessing PA 16027 724-789-7440

Cranberry Twp Post Office 240 Executive Drive Cranberry PA 16066 724-779-1101

East Butler Post Office 720 Grant Avenue East Butler PA 16029 724-287-5169

Eau Claire Post Office 205 South Washington Street Eau Claire PA 16001 724-791-2228

Evans City Post Office 126 South Jackson Street Evans City PA 16033 724-538-9640

Fenelton Post Office 811 Clearfield Road Fenelton PA 16034 724-445-2677

Forestville Post Office 4114 William Flynn Highway Slippery Rock PA 16057 724-735-2327

Harrisville Post Office 115 South Main Street Harrisville PA 16038 724-735-2505

Herman Post Office 102 Geibel Road Butler PA 16002 724-282-3439

Hilliards Post Office 128 Old Mill Road Hilliards PA 16040 724-894-2645

Karns City Post Office 108 Petrolia Street Karns City PA 16041 724-756-3150

Lyndora Post Office 110 Whitestown Road Lyndora PA 16045 724-285-6650

Mars Post Office 111 Grand Avenue Mars PA 16046 724-625-2950

North Washington Post Office 739 Fairview Road Petrolia PA 16050 724-894-2219

What Change of Address options are available?

Customers can request a temporary or permanent Change of Address either online or in person at the Post Office using PS Form 3575. The online application for Change of Address has a $1.00 identity validation fee.

Is it possible to insure mail and items sent via the USPS?

Yes. Standard mail can be insured for up to $5,000 for an additional fee. Registered mail items can be insured for up to $50,000.

What is the USPS Office of Inspector General?

The Office of Inspector General (OIG) is a division within the USPS responsible for ensuring the integrity and accountability of the postal service. It conducts investigations to safeguard the postal system and performs audits and reviews.