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County Code Region Madison 154 07 Marion 155 04 Martin 156 09 Mason 157 09 Matagorda 158 06 Maverick 159 08 McCulloch 160 09 McLennan 161 07 McMullen 162 11 Medina 163 08 Menard 164 09 Midland 165 09 Milam 166 07 Mills 167 07 Mitchell 168 02 Montague 169 02 Montgomery 170 06 Moore 171 01 Morris 172 04 Motley 173 01