This document is Cahners In-Stat Group's official U.S. ISP market review and forecast for the 1997-1999 period. It presents market size information including total U.S. subscriber base and total U.S. ISP revenues for domestic ISPs based on primary and secondary research. This document provides further information regarding ISP spending habits and top-level-view network build-out. It is the first in a series of reports examining the trends in the U.S. ISP industry for the 1997-1999 period. Subsequent reports examine technology adoption and spending at more granular levels.