Influenza Encyclopedia: The American Influenza Epidemic of 1918–1919—A Digital Encyclopedia (University of Michigan)
http://www.influenzaarchive.org/about.html

U.S. Dept. of Health & Human Services, “The Great Pandemic: United States, 1918–1919”
http://www.flu.gov/pandemic/history/1918/

National Archives, “The Deadly Virus: The Influenza Epidemic of 1918”
http://www.archives.gov/exhibits/influenza-epidemic/index.html

Escape Communities: The 1918–1920 Influenza Pandemic Escape Community Digital Document Archive, Center for the History of Medicine, University of Michigan
http://chm.med.umich.edu/research/1918-influenza-escape-communities/

U.S. Navy, “Influenza of 1918 (Spanish Flu) and the US Navy” https://www.history.navy.mil/content/history/nhhc/research/library/online-reading-room/title-list-alphabetically/i/influenza/influenza-of-1918-spanish-flu-and-the-us-navy.html

“Spanish Influenza, 1918–1919,” Historical Views of Diseases and Epidemics website (Harvard University Library). Includes description of the epidemic and some contemporary documents: http://ocp.hul.harvard.edu/contagion/influenza.html

Molly Billings, “The Influenza Pandemic of 1918” (Stanford University). Includes description of the epidemic and some contemporary documents:
http://virus.stanford.edu/uda/#top

U.S. Centers for Disease Control & Prevention—Seasonal flu page is full of current info about influenza:
http://www.cdc.gov/flu/

National Museum of Health and Medicine (two sites):
http://www.flickr.com/search/?w=99129398@N00&q=flu and
http://www.medicalmuseum.mil/index.cfm?p=collections.archives.galleries.index (Select “1918 Influenza Epidemic”)

National Archives, “The Deadly Virus: The Influenza Epidemic of 1918”
http://www.archives.gov/exhibits/influenza-epidemic/records-list.html

U.S. Dept. of Health & Human Services,“The Great Pandemic: United States, 1918–1919”
http://www.flu.gov/pandemic/history/1918/documents_media/index.html

Library of Congress Prints and Photographs, Online Catalog
http://www.loc.gov/pictures/search/?q=influenza%201918

Arizona
Stan Brown, “Arizona’s Bout with the Deadly Flu of 1918,” Payson Roundup (Oct. 14, 2000)
http://www.paysonroundup.com/news/2000/oct/14/arizonas_bout_with/

California
Cecilia Rasmussen, “Flu Epidemic of 1918 Sent Chills Through State,” Los Angeles Times (Nov. 20, 2005)
http://articles.latimes.com/2005/nov/20/local/me-then20

Colorado—Denver
Stephen J. Leonard, “The 1918 Influenza Outbreak: An Unforgettable Legacy,” Denverpost.com (posted May 3, 2009)
http://www.denverpost.com/ci_12268042?IADID=Search-www.denverpost.com-www.denverpost.com

Illinois
Tara McClellan McAndrew, “Killer Flu Hits Springfield,” Illinois Times (Dec. 3, 2009)
http://www.illinoistimes.com/Springfield/article-6658-killer-flu-hits-springfield.html

Massachusetts—Boston
L.S. Block, “The Influenza Epidemic of 1918,” Yankee Magazine (Feb. 1982)
http://www.yankeemagazine.com/article/features/the-influenza-pandemic-of-1918

Mississippi
Louie Matrisciano, “Spanish Influenza in Mississippi (1918),” Historical Text Archive
http://historicaltextarchive.com/sections.php?action=read&artid=773

Montana
“Behind These Mountains: Influenza—Winter 1918–19”
http://www.behindthesemountains.com/2011/02/influenza-winter-1918-19.html

New York—Schenectady
Alan A. Morris, “The Influenza Pandemic of 1918–19 and How It Affected the City of Schenectady, New York” (Senior thesis, Union College, March, 1986)
http://www.schenectadyhistory.org/health/morris/

Oklahoma—Tulsa
Gene Curtis, “1918 Flu Outbreak Forced Closure of Tulsa Venues,” Tulsa World (April 4, 2007)
http://www.tulsaworld.com/news/health/flu-outbreak-forced-closure-of-tulsa-venues/article_6aed0b90-e508-5be0-a5bd-9dfc1f9ac997.html

Wisconsin—Milwaukee
Amy Rabideau Silvers, “1918 Flu Still Echoes,” Milwaukee Journal-Sentinel (May 2, 2009)
http://www.jsonline.com/news/milwaukee/44238872.html