Opp is a city in Covington County, Alabama, United States. At the 2020 census, the population was 6,771. Opp is named after Henry Opp, a l…Opp is a city in Covington County, Alabama, United States. At the 2020 census, the population was 6,771. Opp is named after Henry Opp, a lawyer for the Louisville and Nashville Railroad. Opp is located in eastern Covington County at 31°16′59″N 86°15′17″W / 31.28306°N 86.25472°W. It is bordered by the town of Babbie to the west and the town of Horn Hill to the southwest.