Mombasa County is one of the 47 counties of Kenya. Its capital is Mombasa. In terms of economy it is second after Nairobi. Initially it was one of the former districts of Kenya but in 2013 it was reconstituted as a county, on the same boundaries. It is the smallest county in Kenya, covering an area of 229.7 km2 excluding 65 km2 of water mass. The county is situated in the south eastern part of the former Coast Province. It borders Kilifi County to the north, Kwale County to the south west and the Indian Ocean to the east. Administratively, the county is divided into seven divisions, eighteen locations and thirty sub-locations.

Mombasa is a coastal city in southeastern Kenya along the Indian Ocean. It was the first capital of British East Africa, before Nairobi was elevated to capital status in 1907. It now serves as the capital of Mombasa County. The town is known as "the white and blue city" in Kenya. It is the country's oldest and second-largest city after Nairobi, with a population of about 1,208,333 people according to the 2019 census. Its metropolitan region is the second-largest in the country, and has a population of 3,528,940 people.