Philadelphia Research NARA's Mid Atlantic Region Archives Facility (Center City Philadelphia) 900 Market Street Philadelphia, Pennsylvania 19107-4292 (Entrance on Chestnut Street, between 9th and 10th Streets.) Telephone: 215-606-0100 Fax: 215-606-0116 E-mail: _philadelphia.archives@nara.gov_ (mailto:philadelphia.archives@nara.gov) Hours Monday through Friday, 8:00 A.M. to 5:00 P.M. Second and fourth Saturday each month, 8:00 A.M. to 4:00 P.M. Closed Sundays and _Federal holidays_ (http://www.archives.gov/news/federal-holidays.html) .