Apollo (ah-PAH-lo), borough (1990 pop. 1,895), Armstrong co., W central Pa., 16 mi/26 km S of Kittanning, on Kiskiminetas R. opposite (SE of) Vandergrift; 40°34'N 79°33'W. Mfg. (machining, tool and die, food, apparel, concrete); bituminous coal, gas, clay, limestone in area; agr. (corn, hay; livestock; dairying). Laid out 1815, inc. 1848.