Some of the possible ways to locate high school classmates from 1975 are to search on sites such as Classmates.com or PeopleSmart.com, as well as social media sites such as Facebook.com using name and school information, as of 2015. Many local papers and event websites also publish class reunion announcements.
Classmates.com allows you to choose your exact high school and view various information about other alumni of the school. To do so, navigate through the location options to find your high school and then create a free account with the site. Accounts allow you to see the profiles of other users who graduated from that school, with options to search by year of graduation. General people search sites such as PeopleSmart.com allow you to search for your classmates by name and city, if you know where they currently live.
Another common method for finding classmates is through social media sites, as many allow users to enter information about the high schools they attended. For example, Facebook features a network system that links profiles with common schools or cities, thus allowing you to use the Find Friends feature to see other members who attended your high school in 1975. High school reunions are also a useful way to locate classmates. Many local newspapers publish articles listing upcoming reunions for each year of a school and include details about the school's alumni association.