Cedar Hill, city (1990 pop. 19,976), Dallas and Ellis cos., N Texas, suburb 18 mi/29 km SW of Dallas; 32°34'N 96°57'W. Agr. to S (cattle; dairying; cotton); mfg. (prod. samples, concrete pipes, diversified light mfg.). On S fringe of rapidly growing urban area. L. Joe Pool reservoir to NW, Cedar Hill State Park is on SE shore.