Montserrado County is a county in the northwestern portion of the West African nation of Liberia containing its national capital, Monrovia. One of 15 counties that comprise the first-level of administrative division in the nation, it has 17 sub political districts. As of the 2022 Census, it had a population of 1,920,914, making it the most populous county in Liberia. The area of the county measures 738.5 square miles (1,913 km2), the smallest in the country. Bensonville serves as the capital.

Monrovia is the capital and largest city of Liberia. Founded in 1822, it is located on Cape Mesurado on the Atlantic coast and as of the 2022 census had 1,761,032 residents, home to 33.5% of Liberia’s total population. Its Metro Area including Montserrado and Margibi counties largely being urbanized, was home to 2,225,911 inhabitants as of the 2022 census. As the nation's primate city, Monrovia is the country's economic, financial and cultural center; its economy is primarily centered on its harbor and its role as the seat of Liberian government.