City in Sofia City, Bulgaria Sofia София City 1st row: Sofia skyline from the National Palace of Culture 2nd row: National Assembly Square (Monument to the Tsar Liberator, National Assembly, Alexander Nevsky Cathedral) 3rd row: Largo; National Palace of Culture 4th row: Banya Bashi Mosque 5th row: Saint Sofia Church; Statue of Saint Sofia; Tsarigradsko shose and Capital Fort Flag Coat of arms Motto(s): Grows, but does not age[1] (Расте, но не старее) Sofia Location of Sofia in Bulgaria Coordinates: 42°42′N 23°20′E﻿ / ﻿42.70°N 23.33°E﻿ / 42.70; 23.33Coordinates: 42°42′N 23°20′E﻿ / ﻿42.70°N 23.33°E﻿ / 42.70; 23.33 Country Bulgaria Province Sofia City Cont. inhabited since 7000 BC[2] Neolithic settlement 5500–6000 BC[3] Thracian settlement 1400 BC[4][5] Roman administration 46 AD (as Serdica)[6] Conquered by Krum 809 AD (as Sredets)[6] Government • Mayor Yordanka Fandakova (GERB) Area • City 492 km2 (190 sq mi) • Urban [7] 5,723 km2 (2,210 sq mi) • Metro [8] 10,532 km2 (4,066 sq mi) Elevation 500–2,290 m (1,640–7,510 ft) Population (2017) • City 1,238,438[9] • Density 2,517/km2 (6,520/sq mi) • Urban 1,549,659 [10] • Urban density 271/km2 (700/sq mi) • Metro 1,681,592 [11] • Metro density 160/km2 (400/sq mi) Time zone UTC+2 (EET) • Summer (DST) UTC+3 (EEST) Postal code 1000 Area code(s) (+359) 02 Car plates C, CA, CB Website https://www.sofia.bg/en/web/sofia-municipality/