1977 Cumnock and Doon Valley District Council election|
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| Registered | 33,600 | 
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| Turnout | 51.7%[note 1] | 
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|  | 
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   | Council Leader before election 
 Labour
 | Council Leader after election 
 Labour
 |  | 
 Elections to Cumnock and Doon Valley District Council were held on 3 May 1977, on the same day as the other Scottish local government elections. This was the second election to the district council following the local government reforms in 1974. 
The election used the original 10 wards created by the Formation Electoral Arrangements in 1974. Each ward elected one councillor using first-past-the-post voting.[1] 
Despite losing two seats, Labour maintained control of the district council, winning six of the 10 seats. The 1977 local elections were the first test for the nationalist Scottish Labour Party (SLP) which had been formed as a breakaway from Labour by South Ayrshire MP Jim Sillars alongside John Robertson and Alex Neil. The SLP achieved its best results in Cumnock and Doon Valley by winning two seats from Labour and taking more than 25% of the popular vote but the party ultimately fared poorly across the country. The Conservatives remained on one seat after losing their seat in Mauchline and gaining Catrine and Sorn. This was the last time the Conservatives would win a seat in the area until the 2017 local elections, 40 years later. The remaining seat was won by an independent candidate. 
  Results
  1977 Cumnock and Doon Valley District Council election result   | Party | Seats | Gains | Losses | Net gain/loss | Seats % | Votes % | Votes | +/− | 
     |  | Labour | 6 | 2 | 4 |  2 | 60.0 | 40.1 | 4,613 |  4.6 | 
     |  | SLP | 2 | 2 | 0 |  2 | 20.0 | 24.7 | 2,845 | New | 
     |  | Conservative | 1 | 1 | 1 |   | 10.0 | 8.3 | 954 |  12.4 | 
     |  | Independent | 1 | 1 | 0 |  1 | 10.0 | 6.4 | 732 | New | 
     |  | SNP | 0 | 0 | 0 |   | 0.00 | 17.3 | 1,984 | New | 
     |  | Independent Labour | 0 | 0 | 1 |  1 | 0.00 | 3.2 | 373 |  40.6 | 
    | Total | 10 |  |  |  |  |  | 11,501 |  | 
 Source:[2][3] 
 Ward results
 Cumnock Burgh
  Source:[2][3] 
 Lugar, Logan and Muirkirk
  Source:[2][3] 
 Old Cumnock Parish
  Source:[2][3] 
 Auchinleck
  Source:[2][3] 
 Catrine and Sorn
  Source:[2][3] 
 New Cumnock
  Source:[2][3] 
 Dalmellington
  Source:[2][3] 
 Patna and Dalrymple
  Source:[2][3] 
 Drongan, Ochiltree, Rankinston and Stair
  Source:[2][3] 
 Mauchline
  Source:[2][3] 
 Notes
   - ^ Excludes uncontested wards. 
  References