Coordinates: 38°54′17″N 77°00′59″W﻿ / ﻿38.90472°N 77.01639°W﻿ / 38.90472; -77.01639Coordinates: 38°54′17″N 77°00′59″W﻿ / ﻿38.90472°N 77.01639°W﻿ / 38.90472; -77.01639 Country United States Approved 1790 Organized 1801 Consolidated 1871 Granted limited self-government 1973 Named for George Washington Government • Mayor Muriel Bowser (D) • D.C. Council Council members Phil Mendelson (D), Chairman Anita Bonds (D), At‑large David Grosso (I), At‑large Robert White (D), At‑large Elissa Silverman (I), At‑large Brianne Nadeau (D), Ward 1 Jack Evans (D), Ward 2 Mary Cheh (D), Ward 3 Brandon Todd (D), Ward 4 Kenyan McDuffie (D), Ward 5 Charles Allen (D), Ward 6 Vincent C. Gray (D), Ward 7 Trayon White (D), Ward 8 • U.S. House Eleanor Holmes Norton (D), Delegate (At-large) Area • Federal district 68.34 sq mi (177.0 km2) • Land 61.05 sq mi (158.1 km2) • Water 7.29 sq mi (18.9 km2) Highest elevation 409 ft (125 m) Lowest elevation 0 ft (0 m) Population (2016 estimate)[1][2] • Federal district 681,170 • Rank 22nd, U.S. as of 2015 incorporated places estimate • Density 11,158/sq mi (4,308/km2) • Metro 6,097,684 (6th, U.S.) • CSA 9,625,360 (4th, U.S.) • Demonym Washingtonian[3][4] Time zone EST (UTC−5) • Summer (DST) EDT (UTC−4) ZIP code(s) 20001-20098, 20201-20599 Area code(s) 202 Website www.dc.gov