Haight Street
Haight Street is an internationally known, legendary destination in San Francisco, California.  Eighteen blocks long, it begins on Gough near Market Street and ends right at the entrance to Golden Gate Park at Stanyan Street.  Haight Street lends its name to the entire district, known either simply as The Haight or The Haight-Ashbury, which is bordered to the north by Oak Street and (most would agree) to the south by 17th Street and the winding Roosevelt. Haight Street itself is divided into two parts, generally referred to as the Lower and Upper Haight. Divisadero Street separates Upper from Lower Haight, but both sections are rife with Victorian buildings owned or rented to both residential and commercial clients.
http://www.haightstreet.com/

Mission District
The birthplace of the Bay area was at a now vanished lagoon named after the Lady of Sorrows Dolores in 1776. You can find one of California's newest historical plaques marking this spot less than half a block from the intersection of 16th & Valencia. Today magazines across the country talk about this locale as  the West Coast's "most happening" You will find all manner of bars, cafes,  restaurants and shops catering to one of the most diverse and eclectic communities anywhere.
http://www.sfmission.com/

Union Street
Union Street runs nearly the width of San Francisco, from east to west, extending from its point of origin at the Bay, parallel west between Green and Filbert Streets to its end at the Presidio Reservation, a former Army base currently in the process of being converted to civilian use.  A considerable portion of Union Street, from Van Ness Avenue to The Presidio, is in an area now known as the Cow Hollow section of San Francisco. But that has not always been its name. Originally the area was called Spring Valley, then Golden Gate Valley, according John L. Levinsohn's book, Early Days of a San Francisco Neighborhood from 1776. The neighborhood branch library retains the Golden Gate Valley appellation.  The area our site focuses on, seven blocks between Franklin and Steiner Streets, is a business district with typical San Francisco architecture where you will find examples of both old and modern structures sharing the avenues. The main thoroughfare is a retail destination for visitors and residents alike with the Victorians that line street sharing it with buildings built in the 1960's. Several short alleys branch off into dead ends which makes for an interesting walking and sightseeing experience.
http://www.unionstreet.com/

SF Little Italy, North Beach
http://www.sfnorthbeach.org/

Richmond District, Geary Boulevard.
To the virtual home of the Geary Boulevard Merchants Association and your link to the City of San Francisco.
http://www.gearyblvd.org/

Chinatown
http://www.sanfranciscochinatown.com/

West Portal
The West Portal neighborhood in San Francisco is home to about 2200 dwellings and a three block commercial district with a first-run movie theater, interesting shops, a multitude of services and great restaurants. GWPNA has been the neighborhood association since 1974, and has participated in and initiated many beneficial changes on the Avenue over the years. We welcome new members at any time who are interested in the vibrant life of this community in the "Western Heart" of San Francisco.
http://www.gwpna.org

Cow Hollow
The Cow Hollow Association (CHA) was established many years ago to protect and preserve the residential character of one of San Francisco's distinctive neighborhoods. Current topics of community interest include zoning, Presidio development and traffic control.
http://www.cowhollowassociation.org

Telegraph Hill Association 
Founded in 1954 to perpetuate the historic traditions of San Francisco's Telegraph Hill and to represent the community interests of its residents and property owners.
http://www.thd.org