sentences:  The district encompasses much of the southern and western Sacramento Valley and Wine Country.The Coast Ranges run down the western half of the district.Colusa County – "52.4%"
  
  All of Lake County
  
  All of Napa County
  
  Solano County – "7.3%"
  
  Sonoma County – "14.9%"
  
  Yolo County – "75.7%"
  Due to redistricting, the 4th district has been moved around different parts of the state.