J
| Town name | Postal code |
| Jacobs | 4109 |
| Jacobsdal | 8710 |
| Jagersfontein | 9974 |
| Jamestown | 9742 |
| Jan Kempdorp | 8534 |
| Jan Kempdorp | 8535 |
| Jan Kempdorp | 8550 |
| Jan Kempdorp | 8553 |
| Jan Kempdorp | 8560 |
| Jansenville | 6265 |
| Jeffreys Bay | 6330 |
| Jeffreys Bay | 6331 |
| Jeffreys Bay | 6332 |
| Jeffreysbaai | 6332 |
| Jeppestown | 2094 |
| Johannesburg | 2094 |
| Johannesburg | 2095 |
| Johannesburg | 2100 |
| Johannesburg | 2101 |
| Johannesburg | 2102 |
| Johannesburg | 2103 |
| Johannesburg | 2104 |
| Johannesburg | 2105 |
| Johannesburg | 2106 |
| Johannesburg | 2107 |
| Johannesburg | 2108 |
| Johannesburg | 2109 |
| Johannesburg | 2110 |
| Johannesburg | 2112 |
| Johannesburg | 2113 |
| Johannesburg | 2114 |
| Johannesburg | 2115 |
| Johannesburg | 2116 |
| Johannesburg | 2117 |
| Johannesburg | 2118 |
| Johannesburg | 2119 |
| Johannesburg | 2120 |
| Johannesburg | 2121 |
| Johannesburg | 2122 |
| Johannesburg | 2123 |
| Johannesburg | 2124 |
| Johannesburg | 2128 |
| Johannesburg | 2129 |
| Johannesburg | 2130 |
| Johannesburg | 2131 |
| Johannesburg | 2132 |
| Johannesburg | 2134 |
| Johannesburg | 2135 |
| Johannesburg | 2136 |
| Johannesburg | 2137 |
| Johannesburg | 2139 |
| Johannesburg | 2140 |
| Johannesburg | 2141 |
| Johannesburg | 2142 |
| Johannesburg | 2143 |
| Johannesburg | 2145 |
| Johannesburg | 2147 |
| Johannesburg | 2148 |
| Johannesburg | 2149 |
| Johannesburg | 2151 |
| Johannesburg | 2152 |
| Johannesburg | 2153 |
| Johannesburg | 2154 |
| Johannesburg | 2155 |
| Johannesburg | 2156 |
| Johannesburg | 2157 |
| Johannesburg | 2158 |
| Johannesburg | 2159 |
| Johannesburg | 2160 |
| Johannesburg | 2161 |
| Johannesburg | 2163 |
| Johannesburg | 2164 |
| Johannesburg | 2169 |
| Johannesburg | 2170 |
| Johannesburg | 2171 |
| Johannesburg | 2188 |
| Johannesburg | 2190 |
| Johannesburg | 2191 |
| Johannesburg | 2192 |
| Johannesburg | 2193 |
| Johannesburg | 2194 |
| Johannesburg | 2195 |
| Johannesburg | 2196 |
| Johannesburg | 2197 |
| Johannesburg | 2198 |
| Johannesburg | 2000 |
| Johannesburg | 2001 |
| Johannesburg | 2003 |
| Johannesburg | 2004 |
| Johannesburg | 2005 |
| Johannesburg | 2006 |
| Johannesburg | 2007 |
| Johannesburg | 2008 |
| Johannesburg | 2009 |
| Johannesburg | 2010 |
| Johannesburg | 2011 |
| Johannesburg | 2012 |
| Johannesburg | 2013 |
| Johannesburg | 2014 |
| Johannesburg | 2015 |
| Johannesburg | 2016 |
| Johannesburg | 2017 |
| Johannesburg | 2018 |
| Johannesburg | 2019 |
| Johannesburg | 2020 |
| Johannesburg | 2021 |
| Johannesburg | 2022 |
| Johannesburg | 2023 |
| Johannesburg | 2024 |
| Johannesburg | 2026 |
| Johannesburg | 2028 |
| Johannesburg | 2030 |
| Johannesburg | 2031 |
| Johannesburg | 2033 |
| Johannesburg | 2034 |
| Johannesburg | 2035 |
| Johannesburg | 2036 |
| Johannesburg | 2037 |
| Johannesburg | 2038 |
| Johannesburg | 2040 |
| Johannesburg | 2041 |
| Johannesburg | 2042 |
| Johannesburg | 2043 |
| Johannesburg | 2044 |
| Johannesburg | 2047 |
| Johannesburg | 2048 |
| Johannesburg | 2049 |
| Johannesburg | 2050 |
| Johannesburg | 2051 |
| Johannesburg | 2053 |
| Johannesburg | 2054 |
| Johannesburg | 2055 |
| Johannesburg | 2058 |
| Johannesburg | 2059 |
| Johannesburg | 2060 |
| Johannesburg | 2061 |
| Johannesburg | 2062 |
| Johannesburg | 2063 |
| Johannesburg | 2064 |
| Johannesburg | 2065 |
| Johannesburg | 2070 |
| Johannesburg | 2074 |
| Johannesburg | 2076 |
| Johannesburg | 2078 |
| Johannesburg | 2081 |
| Johannesburg | 2082 |
| Johannesburg | 2090 |
| Johannesburg | 2091 |
| Johannesburg | 2092 |
| Johannesburg | 2093 |
| Joubertina | 6410 |
| Jouberton | 2574 |
| Jozini | 3982 |
| Jozini | 3983 |
| Jozini | 3984 |
| Jozini | 3985 |
| Jozini | 3986 |
| Jozini | 3987 |
| Jozini | 3989 |
| Jukskeipark | 2188 |
| Jukskeipark | 2153 |
| Juno | 0748 |
| Juno | 0758 |
| Juno | 0836 |
| Juno | 0845 |
| Juno | 0916 |
