Montgomery County research collections are available to at these locations:

Jane C. Sween Library
111 W. Montgomery Ave.  (at rear)
(next to West Middle Lane parking)
Rockville, MD 20850
Phone: (301) 340-2974
Email: info@montgomeryhistory.org
Hours: Tues.-Sat, 10-4p.m., Sundays 1-4p.m. (Note: Starting July 1, 2010 the hours of the MCHS Library will be Wednesday-Friday, 10:00-4:00, and Saturday 12:00-4:00.)
Fees: $5.00 for adults, $3.00 for seniors & students; free to members
Librarian: Patricia Andersen

The Waters House History Center
12535 Milestone Manor Lane
Germantown, MD 20876
Phone: (301)-515-2887
Hours: Wednesday and Saturdays, 10-4pm or by appointment

The Montgomery County Archives
29 Courthouse Square
Rockville, MD 20850
Phone: (301) 340-2974
Hours by appointment