a county of S England, bordering on Greater London in the south: mainly low-lying, with the Chiltern Hills in the northwest; largely agricultural; light industries, esp in the new towns. Administrative centre: Hertford. Pop: 1 040 900 (2003 est). Area: 1634 sq km (631 sq miles)
Hertfordshire in American English
(ˈhɑrfərdʃɪr; ˈhɑrtfərdʃɪr)
county in SE England: 633 sq mi (1,639 sq km); pop. 976,000