A 17-year-old boy, a 19-year-old woman and a 40-year-old man, all residents of the town, were killed in the attack on Sunday, Corinto Mayor Gilberto Muñoz said.
Eight of the 18 wounded civilians were taken to hospitals in Cali, the capital of neighboring Valle del Cauca province, the mayor said.
This was the fourth attack this year by the Revolutionary Armed Forces of Colombia, or FARC, on Corinto, which is in Cauca province.
The guerrilla attack was repelled by the police officers stationed in the town, located some 500 kilometers (311 miles) from Bogota.
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