| Rank | County | Businesses | 
                            
                                
                                    | 1 | King County, Washington | 196,686 | 
                            
                                
                                    | 2 | Snohomish County, Washington | 55,231 | 
                            
                                
                                    | 3 | Pierce County, Washington | 53,296 | 
                            
                                
                                    | 4 | Spokane County, Washington | 38,017 | 
                            
                                
                                    | 5 | Clark County, Washington | 32,941 | 
                            
                                
                                    | 6 | Kitsap County, Washington | 20,393 | 
                            
                                
                                    | 7 | Thurston County, Washington | 20,125 | 
                            
                                
                                    | 8 | Whatcom County, Washington | 19,639 | 
                            
                                
                                    | 9 | Yakima County, Washington | 12,963 | 
                            
                                
                                    | 10 | Benton County, Washington | 11,137 | 
                            
                                
                                    | 11 | Skagit County, Washington | 10,513 | 
                            
                                
                                    | 12 | Island County, Washington | 7,900 | 
                            
                                
                                    | 13 | Clallam County, Washington | 6,845 | 
                            
                                
                                    | 14 | Chelan County, Washington | 6,833 | 
                            
                                
                                    | 15 | Cowlitz County, Washington | 6,121 | 
                            
                                
                                    | 16 | Lewis County, Washington | 5,763 | 
                            
                                
                                    | 17 | Grays Harbor County, Washington | 5,055 | 
                            
                                
                                    | 18 | Grant County, Washington | 4,913 | 
                            
                                
                                    | 19 | Walla Walla County, Washington | 4,437 | 
                            
                                
                                    | 20 | Mason County, Washington | 4,216 | 
                            
                                
                                    | 21 | Franklin County, Washington | 4,210 | 
                            
                                
                                    | 22 | Jefferson County, Washington | 4,007 | 
                            
                                
                                    | 23 | San Juan County, Washington | 3,507 | 
                            
                                
                                    | 24 | Okanogan County, Washington | 3,419 | 
                            
                                
                                    | 25 | Stevens County, Washington | 3,376 | 
                            
                                
                                    | 26 | Kittitas County, Washington | 3,320 | 
                            
                                
                                    | 27 | Douglas County, Washington | 2,598 | 
                            
                                
                                    | 28 | Whitman County, Washington | 2,531 | 
                            
                                
                                    | 29 | Klickitat County, Washington | 1,958 | 
                            
                                
                                    | 30 | Pacific County, Washington | 1,645 | 
                            
                                
                                    | 31 | Asotin County, Washington | 1,456 | 
                            
                                
                                    | 32 | Pend Oreille County, Washington | 1,076 | 
                            
                                
                                    | 33 | Adams County, Washington | 1,002 | 
                            
                                
                                    | 34 | Skamania County, Washington | 875 | 
                            
                                
                                    | 35 | Lincoln County, Washington | 692 | 
                            
                                
                                    | 36 | Ferry County, Washington | 598 | 
                            
                                
                                    | 37 | Columbia County, Washington | 298 | 
                            
                                
                                    | 38 | Wahkiakum County, Washington | 253 | 
                            
                                
                                    | 39 | Garfield County, Washington | 97 |