Helmstedt District Coat of arms Country Germany State Lower Saxony Capital Helmstedt Area • Total 674 km2 (260 sq mi) Population (31 December 2015)[1] • Total 91,500 • Density 140/km2 (350/sq mi) Time zone CET (UTC+1) • Summer (DST) CEST (UTC+2) Vehicle registration HE Website helmstedt.de