GLASSPORT, a borough of Allegheny county, Pa., U.S.A., Iom. S.E. of Pittsburgh, on the Monongahela river and the Pitts burgh and Lake Erie railroad. The population was 6,959 in 192o (25% foreign-born white) and was 8,390 in 193o by the Federal census. The leading industries are glass-making, copper welding and steel foundry work. Glassport was settled about 1900.