The Lamont Cooperative Seismic Network Charles Scharnberger, Millersville University, Millersville, PA 17551; Stefanie Baxter, Delaware Geological Survey, Newark, DE 19716; Stephen Kramer, W.H. Miner Agricultural Research Institute, Chazy, NY 12921; David Franzi, Center for Earth and Environmental Science, Plattsburgh State University, Plattsburgh, NY 12901; Sam Reese, Allegheny College, Meadville, PA 16335; Anne Meltzer, Lehigh University, Bethlehem, PA 18015, and Won-Young Kim, Lamont Doherty Earth Observatory of Columbia University, Palisades, NY 10964. The Lamont Cooperative Seismic Network consists of 21 broadband seismographic stations and an additional 21 short-period stations using analog radio telemetry links. Stations, which are located in New York, Connecticut, New Jersey, Pennsylvania, Delaware and Maryland, are operated by 25 cooperating partners, with Lamont Doherty Earth Observatory (LDEO) serving as the lead institution. Partners include colleges and universities, community colleges, secondary schools, museums, a state geological survey, conservation organizations, research institutes, and a tourist attraction. Subnetworks include the Palisades subnetwork, operated by LDEO, the Potsdam subnetwork, operated by SUNY Potsdam, and the Delaware subnetwork, operated by the Delaware Geological Survey. In the 12 month period ending August 31, 2006, the LCSN located 65 earthquakes in the northeastern U.S. and southeastern Canada. The LCSN offers unique educational opportunities for students at a variety of levels, for public officials, and for the general public. Participation in the network provides valuable professional development opportunities for station operators, most of whom are not professional seismologists. The LCSN welcomes new partners, especially institutions interested in operating a station. The Network's web site is: www.ldeo.columbia.edu/LCSN. The backbone of the LCSN real time data acquisition for earthquake monitoring in the northeastern U.S. is the Internet based Earthworm system. All seismogram data acquired by LCSN are archived at the IRIS-DMC in Seattle, Washington in real time for archiving and further dissemination to users worldwide. Much of the earthquake data such as catalogs, maps, recent earthquakes, felt reports (Did-You-Feel-It?), and waveform data are disseminated via WWW, which provides cost efficient means to disseminate such information.