Due to the holiday weekend, many Post Offices around the country will either be closed on Saturday, July 2 or have a closing time of 12 Noon on July 2nd. Post Offices will be closed Monday, July 4 in observance of the national holiday. Express Mail will be delivered on the 4th and regular mail delivery will resume Tuesday, July 5.
According to USPS:
Pennsylvania – All Post Offices will be open Friday and Saturday, July 1 & 2, throughout the Western PA District, encompassing 150-159, 160-168 & 260 ZIP Code areas, however many will shorten retail lobby hours for the unofficial first days of the Fourth of July holiday weekend. Regular mail delivery for July 1 & 2 will be unaffected by the lobby service schedule changes. P.O. Box mail access will only be available until 12 p.m. in those Post Offices where retail counters and access to Post Office Boxes are co-located and are affected by early retail closings on July 1 & 2. Customers may call 1-800-ASK-USPS for information about specific Post Offices. Commercial customers are asked to check with their Bulk Mail Acceptance Unit for hours of operation.
Greater Boston, MA—The Fort Point Post Office located at 25 Dorchester Ave. Boston will be open on Sunday, July 3, 2011 from 8:00 p.m. to 5:00 p.m., and Monday July 4, 2011, from 8:00 a.m. to 5:00 p.m. for all your postal needs.In observance of the July 4, 2011 Holiday, all other Post Offices in Greater Boston will be closed on Sunday, July 3, 2011 and Monday, July 4, 2011. There will be no mail distribution to Post Office Boxes, and no mail will be collected from collection boxes.
Alabama- The U.S. Postal Service is adjusting retail hours of operation for the July 4th holiday weekend; 370 Alabama Post Offices regularly open on Saturday, will be closed on Saturday, July 2. A sign is posted at each location.
BALTIMORE, MD – Post Offices in the Baltimore District (comprised of ZIP codes beginning with 210 – 219) will be operating on adjusted retail hours Friday, July 1, 2011 and Saturday, July 2, 2011 in observance of the Independence Day holiday. Revised hours will be posted at each Post Office. Regular mail delivery for July 1 and July 2 will be unaffected by the lobby service schedule changes. Post Office Box customers will have access to their Post Office Boxes on July 1 and July 2 according to the retail units’ scheduled hours of operation (hours will be posted at each Post Office). All collection box pick-up times will remain as indicated on collection box. Commercial customers are asked to check with their Bulk Mail Acceptance Unit for July 1 and July 2 hours of operation.
Post office hours may vary in each city.