: Current lease/mortgage, voter registration, vehicle registration, or home/auto insurance policy.

To finalize your rental and get your keys, you must provide : one with a photo and one that verifies your physical address.

: Fill out the PS Form 1093 online or at the counter. You will need to provide payment via credit/debit card (online) or cash/check (in person).

: Choose from five standard sizes based on your mail volume and a rental period of 3, 6, or 12 months .

Prices vary significantly by location (urban vs. rural) and are subject to change. Dimensions (Approx.) Est. Monthly Price 10–15 letters or 2 rolled magazines Size 2 (S) 15–20 letters or 5 rolled magazines Size 3 (M) 11" x 5.5" Large envelopes stacked flat Size 4 (L) Two small shoe boxes + letters Size 5 (XL) 22.5" x 12" Largest parcels and flat rate boxes $21–$115 PO Boxes - USPS