The larger of the two USPS post offices in Lawrence Township, the Circle Branch facility processes mail from several ZIP codes in Mercer County. Located along the southbound side of Brunswick Pike (Business Route 1), just north of Texas Avenue, this post office houses a large number of PO boxes. In addition to selling stamps and packing materials, this post office also processes passport applications. This post office can be very busy at times, particularly around lunchtime and during the holiday season. The parking lot is large, but it can sometimes be difficult to find a parking space during busy periods. There's a convenient curbside mailbox located near the front of the parking lot.