“The African National Congress is grateful to all people who came out once again to cast their vote, entrenching democracy in our country,” party spokesman Zizi Kodwa said in a statement on Thursday.
“We do not take for granted the confidence our people continue to demonstrate in the ANC and commit to redouble our efforts to continue to strengthen the capacity of local government to deliver even better.”
The ANC welcomed the outcome of the by-elections and congratulated the Electoral Commission of SA (IEC) for holding credible, free and fair by-elections.
Democratic Alliance leader Helen Zille said her party had shown strong growth in the by-elections.
“These results are a clear sign that the DA continues to grow in key battleground metros and wards ahead of the 2016 elections,” she said in a statement.
“We would like to thank every single one of our supporters who contributed to yesterday’s successful results.”
The DA won 14 of the 20 wards in the by-elections, according to results released by the IEC.
The ANC secured five wards, while the Inkatha Freedom Party took one ward.
Of the DA’s 14 wards, six were in Gauteng, five in KwaZulu-Natal, two in Mpumalanga, and one in the Western Cape.
Of the ANC’s five wards, two were in Gauteng, one in the Eastern Cape, one in KwaZulu-Natal, and one in the Northern Cape.