If you are talking about in the world it would be:
Quito, Ecuador. It's closest to the equator (0º14'S / 78º30'W)
The capital city Quito, in Ecuador, is centered just 15 miles (25 km) south of the equator, and extends to within 6/10 of a mile (1 km) of the zero latitude line.
If you are talking about the United States it would be:
Honolulu, Hawaii (21.3069° N /157.8583° W)
Honolulu is 1,472.17 mi (2,369.23 km) north of the equator\
In South America: Quito, Ecuador. (Ecuador means equator.) In Africa: Uganda, Kenya, and Gabon have capitals near the equator.
The capital city Quito, in Ecuador, is centered just 15 miles (25 km) south of the equator, and extends to within 6/10 of a mile (1 km) of the zero latitude line.
The capital city Kampala, of Uganda is located about 15 miles (25 km) NORTH of the equator. Entebbe International Airport, on Lake Victoria, is within 2 miles (3.2 km) of zero latitude. The Ugandan town of Nebusanke, to the SW of Kampala, is directly on the equator.
Honolulu, the capital of Hawaii is the closest US state capital to the equator. The closest U. S. territorial capital to the equator is Hagåtña, Guam.
Brisbane, Queensland, is the Australian state capital closest to the equator. Darwin, the capital of the Northern Territory, is even closer to the equator, but N.T. is not a state.
Quito
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Quito is the capital city of Ecuador. It is the closest South America capital city to the equator. Quito is located 00 degrees 14′S.
The capital city that's closes to equator is: Quito, which is the capital of Ecuador where it's closest position is: 80.6W
Quito, the capital of Ecuador
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