Chapter 18.20 RESIDENTIAL DISTRICTS (R) This chapter is included in your selections. Sections: 18.20.010 Primary uses. 18.20.020 Accessory uses. 18.20.030 Conditional uses. 18.20.040 Prohibited uses. 18.20.050 Dimensional standards. 18.20.060 Off-street parking. 18.20.070 Signs and sidewalks.