Thanks everyone for you input on my quest for literary museums and houses.
Here is a list of what I found.

Larisa Overmier
Manager Museum-ed
Project Assistant, Museum Management Consultants

Partial List of Literary Museums and Houses

Noah Webster House
        Dearborn, MI
William Holmes McGuffy Birthplace
        Dearborn, MI
Noah Webster Birthplace
        West Hartford, CT
Scott & Zelda Fitzgerald Museum
        Montgomery, AL
Thomas Wolfe Memorial
        Ashville, NC
Mishima Yukio Museum
        Japan
Hans Christian Andersen Museum
        Denmark
Stephen Leacock Museum
        Ontario, Canada
Erskine Caldwell Birthplace and Museum
        Moreland, GA
Sherlock Holmes Museum
        London, England
Rachel Carson Homestead
        Springdale, PA
Edith Wharton House
Markham House
        San Jose, CA
Edgar Allen Poe Cottage
        Bronx, NY
Edgar Allen Poe House and Museum
        Baltimore, MD
Edgar Allan Poe Museum
        Richmond, VA
Edgar Allan Poe National Historic Site
        Philadelphia, PA
H.L. Mencken House
        Baltimore, MD
O. Henry Home and Museum
        Austin, TX
O. Henry House
        San Antonio, TX
Willa Cather Historical Center
        Red Cloud, NE
Willa Cather Pioneer Memorial and Educational foundation
        Red Cloud, NE
Ernest Hemingway House Museum
        Key West, FL
Ernest Hemingway Foundation and Museum
        Oak Park, IL
Pearl S. Buck Birthplace Foundation
        Marlington, WV
Pearl S. Buck House
        Perkasie, PA
Henry Wadsworth Longfellow House
        Cambridge, MA
Eugene O'Neill House
        New London, CT
Eugene O'Neill National Historic Site
        Danville, CA
John Steinbeck Memorial Museum
        Pacific Grove, CA
Rowan Oak/William Faulkner's Home
        Oxford, MS
Robert Louis Stevenson House
        Monterey, CA
Robert Louis Stevenson Memorial Cottage
        Saranac Lake, NY
Mark Twain Boyhood Home & Museum
        Hannibal, MO
Mark Twain Memorial House
        Hartford, CT
Mark Twain Birthplace State Historic Site
        Soutsville, MO
Harriet Beecher Stowe Center
        Hartford, CT
Louise May Alcott House
        Concord, MA
James Thurber House
        Columbus, OH
Laura Ingalls Wilder House
        Mansfield, MT
Folger Shakespeare Library and Museum
        Washington, D.C.
Henry Miller Library
        Big Sur, CA
Jack London State Historic Park
        Glen Ellen, CA
Tor House (Home of poet Robinson Jeffers)
        Carmel, CA
Carl Sandburg Home National Historic Site
        Flat Rock, NC
Carl Sandburg State Historic Site
        Galesburg, IL
Walt Whitman Birthplace State Historic Site
        Huntington Station, NY
Walt Whitman House
        Camden, NJ