www.americanimpressionistsociety.org - Official site for the American Impressionist Society headquartered in Forestville, California. 

www.p-a-p-a.com  - Official site for the Plein Air Painters of America.

www.CaliforniaArtClub.org - Site for the California Art Club and the Oil Painters of America

www.lpapa.org - Site for the Laguna Plein Air Painters Association. 

www.pleinairflorida.org - A network of Florida artists who paint on location.

www.TheOakGroup.org - A group of plein air painters out of the Santa Barbara area who donate 50 percent of their sales to preserve the environment.

www.nappap.org  - National Academy of Professional Plein Air Painters - a national organization organized for the support of the professional artists and collaborative efforts.

www.PaintOhio.com  -  Site for the Ohio Plein Air Society.

www.westrendart.com  -  Site for the Northwest Rendezvous Group of artists who hold a yearly show in Montana.

www.tpaps.com - Tucson Plein Air Society.

www.pleinairaustin.org - An Austin, Texas plein air group of artists

Museums

www.irvinemuseum.org - The only California museum devoted exclusively to early California Impressionism.  Located in Orange County. On-line bookstore.

www.lagunaartmuseum.org - Founded in 1918,  the Laguna Art Museum specializes in American art and focuses on California

www.museumca.org - The Oakland Museum is devoted exclusively to California art with an extensive collection of early California paintings. On-line bookstore.

www.montereyart.org  - The Monterey Museum of Art has a significant collection of early California paintings including those from the Carmel Art Colony.  Two locations at Civic Center and La Mirada. 

www.sdmart.org - Founded in 1926, the San Diego Museum of Art specializes in American art and includes many American and California Impressionists.  On-line bookstore

www.pleinairpaintersofidaho.org  Plein Air Painters of Idaho.