R-T Residential Transition District; R-S-20 Suburban District; R-S-12 Suburban District; R-S-1 Suburban District; R-1 Low Density Residential District; R-1-A Low Density Residential Alternate District; R-1-A2 Low Density Residential Alternate District; R-2 Medium Density Residential District; R-3 Medium Density Residential District; R-4 High Density Residential District