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′Eufeff / ufeff42.70°N 23.33°Eufeff / 42.70; 23.33Coordinates: 42°42′N 23°20′Eufeff / ufeff42.70°N 23.33°Eufeff / 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 •xa0Mayor Yordanka Fandakova (GERB) Area •xa0City 492xa0km2 (190xa0sqxa0mi) •xa0Urban [7] 5,723xa0km2 (2,210xa0sqxa0mi) •xa0Metro [8] 10,532xa0km2 (4,066xa0sqxa0mi) Elevation 500–2,290xa0m (1,640–7,510xa0ft) Population (2017) •xa0City 1,238,438[9] •xa0Density 2,517/km2 (6,520/sqxa0mi) •xa0Urban 1,549,659 [10] •xa0Urbanxa0density 271/km2 (700/sqxa0mi) •xa0Metro 1,681,592 [11] •xa0Metroxa0density 160/km2 (400/sqxa0mi) Time zone UTC+2 (EET) •xa0Summer (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/