Maardu is a town and a municipality in Harju County, Estonia. It is part of Tallinn metropolitan area. The town covers an area of 22.76 km² and has a population of 16,529 (as of 1 January 2010). The Port of Muuga, the largest cargo port in Estonia, is partly located in Maardu. According to the 2000 Census, the population was 16,738. 61.7% were Russians, 19.9% Estonians, 6.6% Ukrainians, 5.7% Belarusians, 1.5% Tatars, 0.9% Finns, 0.6% Poles, 0.5% Lithuanians, 0.2% Latvians, 0.2% Germans and 0.1% Jews. The proportion of Estonians was one of the lowest (if not the lowest) in Central and Western Estonia.