how big is washington dc
Originally Washington DC was 10 miles square (or 100 square miles). But some of the land was returned to the Commonwealth of Virginia. Today the city is...    Area  â¦ - City 68.3 sq mi (177.0 km2)   - Land 61.4 sq mi (159.0 km2)   - Water 6.9 sq mi (18.0 km2) 3 people found this useful.