The Presbyterian Church (U.S.A) website contains a find a congregation feature that allows visitors to find a list of churches based on zip code or city and state. The Presbyterian Church in America website contains a similar search feature, as well as an option to order a printed directory.
Wikipedia contains a list of Presbyterian churches in the United States that are notable either as a congregation or as a building. As of 2013, the Presbyterian Church (U.S.A.) had over 10,000 congregations in the United States, with more than 1.7 million members.
The Presbyterian Church (U.S.A.) has been the primary Presbyterian organization in America since 1983, when it arose from the merger of the Presbyterian Church in the United States and the United Presbyterian Church in the United States of America.