A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 1051, SAN ANTONIO, TX 78294-1051
PO BOX 1052, SAN ANTONIO, TX 78294-1052
PO BOX 1053, SAN ANTONIO, TX 78294-1053
PO BOX 1054, SAN ANTONIO, TX 78294-1054
PO BOX 1055, SAN ANTONIO, TX 78294-1055
PO BOX 1056, SAN ANTONIO, TX 78294-1056
PO BOX 1057, SAN ANTONIO, TX 78294-1057
PO BOX 1058, SAN ANTONIO, TX 78294-1058
PO BOX 1059, SAN ANTONIO, TX 78294-1059
PO BOX 1060, SAN ANTONIO, TX 78294-1060
PO BOX 1061, SAN ANTONIO, TX 78294-1061
PO BOX 1062, SAN ANTONIO, TX 78294-1062
PO BOX 1063, SAN ANTONIO, TX 78294-1063
PO BOX 1064, SAN ANTONIO, TX 78294-1064
PO BOX 1065, SAN ANTONIO, TX 78294-1065
PO BOX 1066, SAN ANTONIO, TX 78294-1066
PO BOX 1067, SAN ANTONIO, TX 78294-1067
PO BOX 1068, SAN ANTONIO, TX 78294-1068
PO BOX 1069, SAN ANTONIO, TX 78294-1069
PO BOX 1070, SAN ANTONIO, TX 78294-1070
PO BOX 1071, SAN ANTONIO, TX 78294-1071
PO BOX 1072, SAN ANTONIO, TX 78294-1072
PO BOX 1073, SAN ANTONIO, TX 78294-1073
PO BOX 1074, SAN ANTONIO, TX 78294-1074
PO BOX 1075, SAN ANTONIO, TX 78294-1075
PO BOX 1076, SAN ANTONIO, TX 78294-1076
PO BOX 1077, SAN ANTONIO, TX 78294-1077
PO BOX 1078, SAN ANTONIO, TX 78294-1078
PO BOX 1079, SAN ANTONIO, TX 78294-1079
PO BOX 1080, SAN ANTONIO, TX 78294-1080
PO BOX 1081, SAN ANTONIO, TX 78294-1081
PO BOX 1082, SAN ANTONIO, TX 78294-1082
PO BOX 1083, SAN ANTONIO, TX 78294-1083
PO BOX 1084, SAN ANTONIO, TX 78294-1084
PO BOX 1085, SAN ANTONIO, TX 78294-1085
PO BOX 1086, SAN ANTONIO, TX 78294-1086
PO BOX 1087, SAN ANTONIO, TX 78294-1087
PO BOX 1088, SAN ANTONIO, TX 78294-1088
PO BOX 1089, SAN ANTONIO, TX 78294-1089
PO BOX 1090, SAN ANTONIO, TX 78294-1090
PO BOX 1091, SAN ANTONIO, TX 78294-1091
PO BOX 1092, SAN ANTONIO, TX 78294-1092
PO BOX 1093, SAN ANTONIO, TX 78294-1093
PO BOX 1094, SAN ANTONIO, TX 78294-1094
PO BOX 1095, SAN ANTONIO, TX 78294-1095
PO BOX 1096, SAN ANTONIO, TX 78294-1096
PO BOX 1097, SAN ANTONIO, TX 78294-1097
PO BOX 1098, SAN ANTONIO, TX 78294-1098
PO BOX 1099, SAN ANTONIO, TX 78294-1099
PO BOX 1100, SAN ANTONIO, TX 78294-1100
PO BOX 1101, SAN ANTONIO, TX 78294-1101
PO BOX 1102, SAN ANTONIO, TX 78294-1102
PO BOX 1103, SAN ANTONIO, TX 78294-1103
PO BOX 1104, SAN ANTONIO, TX 78294-1104
PO BOX 1105, SAN ANTONIO, TX 78294-1105
PO BOX 1106, SAN ANTONIO, TX 78294-1106
PO BOX 1107, SAN ANTONIO, TX 78294-1107
PO BOX 1108, SAN ANTONIO, TX 78294-1108
PO BOX 1109, SAN ANTONIO, TX 78294-1109
PO BOX 1110, SAN ANTONIO, TX 78294-1110
PO BOX 1111, SAN ANTONIO, TX 78294-1111
PO BOX 1112, SAN ANTONIO, TX 78294-1112
PO BOX 1113, SAN ANTONIO, TX 78294-1113
PO BOX 1114, SAN ANTONIO, TX 78294-1114
PO BOX 1115, SAN ANTONIO, TX 78294-1115
PO BOX 1116, SAN ANTONIO, TX 78294-1116
PO BOX 1117, SAN ANTONIO, TX 78294-1117
PO BOX 1118, SAN ANTONIO, TX 78294-1118
PO BOX 1119, SAN ANTONIO, TX 78294-1119
PO BOX 1120, SAN ANTONIO, TX 78294-1120
PO BOX 1121, SAN ANTONIO, TX 78294-1121
PO BOX 1122, SAN ANTONIO, TX 78294-1122
PO BOX 1123, SAN ANTONIO, TX 78294-1123
PO BOX 1124, SAN ANTONIO, TX 78294-1124
PO BOX 1125, SAN ANTONIO, TX 78294-1125
PO BOX 1126, SAN ANTONIO, TX 78294-1126
PO BOX 1127, SAN ANTONIO, TX 78294-1127
PO BOX 1128, SAN ANTONIO, TX 78294-1128
PO BOX 1129, SAN ANTONIO, TX 78294-1129
PO BOX 1130, SAN ANTONIO, TX 78294-1130
PO BOX 1131, SAN ANTONIO, TX 78294-1131
PO BOX 1132, SAN ANTONIO, TX 78294-1132
PO BOX 1133, SAN ANTONIO, TX 78294-1133
PO BOX 1134, SAN ANTONIO, TX 78294-1134
PO BOX 1135, SAN ANTONIO, TX 78294-1135
PO BOX 1136, SAN ANTONIO, TX 78294-1136
PO BOX 1137, SAN ANTONIO, TX 78294-1137
PO BOX 1138, SAN ANTONIO, TX 78294-1138
PO BOX 1139, SAN ANTONIO, TX 78294-1139
PO BOX 1140, SAN ANTONIO, TX 78294-1140
PO BOX 1141, SAN ANTONIO, TX 78294-1141
PO BOX 1142, SAN ANTONIO, TX 78294-1142
PO BOX 1143, SAN ANTONIO, TX 78294-1143
PO BOX 1144, SAN ANTONIO, TX 78294-1144
PO BOX 1145, SAN ANTONIO, TX 78294-1145
PO BOX 1146, SAN ANTONIO, TX 78294-1146
PO BOX 1147, SAN ANTONIO, TX 78294-1147
PO BOX 1148, SAN ANTONIO, TX 78294-1148
PO BOX 1149, SAN ANTONIO, TX 78294-1149
PO BOX 1150, SAN ANTONIO, TX 78294-1150
PO BOX 1151, SAN ANTONIO, TX 78294-1151
PO BOX 1152, SAN ANTONIO, TX 78294-1152
PO BOX 1153, SAN ANTONIO, TX 78294-1153
PO BOX 1154, SAN ANTONIO, TX 78294-1154
PO BOX 1155, SAN ANTONIO, TX 78294-1155
PO BOX 1156, SAN ANTONIO, TX 78294-1156
PO BOX 1157, SAN ANTONIO, TX 78294-1157
PO BOX 1158, SAN ANTONIO, TX 78294-1158
PO BOX 1159, SAN ANTONIO, TX 78294-1159
PO BOX 1160, SAN ANTONIO, TX 78294-1160
PO BOX 1161, SAN ANTONIO, TX 78294-1161
PO BOX 1162, SAN ANTONIO, TX 78294-1162
PO BOX 1163, SAN ANTONIO, TX 78294-1163
PO BOX 1164, SAN ANTONIO, TX 78294-1164
PO BOX 1165, SAN ANTONIO, TX 78294-1165
PO BOX 1166, SAN ANTONIO, TX 78294-1166
PO BOX 1167, SAN ANTONIO, TX 78294-1167
PO BOX 1168, SAN ANTONIO, TX 78294-1168
PO BOX 1169, SAN ANTONIO, TX 78294-1169
PO BOX 1170, SAN ANTONIO, TX 78294-1170
PO BOX 1171, SAN ANTONIO, TX 78294-1171
PO BOX 1172, SAN ANTONIO, TX 78294-1172
PO BOX 1173, SAN ANTONIO, TX 78294-1173
PO BOX 1174, SAN ANTONIO, TX 78294-1174
PO BOX 1175, SAN ANTONIO, TX 78294-1175
PO BOX 1176, SAN ANTONIO, TX 78294-1176
PO BOX 1177, SAN ANTONIO, TX 78294-1177
PO BOX 1178, SAN ANTONIO, TX 78294-1178
PO BOX 1179, SAN ANTONIO, TX 78294-1179
PO BOX 1180, SAN ANTONIO, TX 78294-1180
PO BOX 1181, SAN ANTONIO, TX 78294-1181
PO BOX 1182, SAN ANTONIO, TX 78294-1182
PO BOX 1183, SAN ANTONIO, TX 78294-1183
PO BOX 1184, SAN ANTONIO, TX 78294-1184
PO BOX 1185, SAN ANTONIO, TX 78294-1185
PO BOX 1186, SAN ANTONIO, TX 78294-1186
PO BOX 1187, SAN ANTONIO, TX 78294-1187
PO BOX 1188, SAN ANTONIO, TX 78294-1188
PO BOX 1189, SAN ANTONIO, TX 78294-1189
PO BOX 1190, SAN ANTONIO, TX 78294-1190
PO BOX 1191, SAN ANTONIO, TX 78294-1191
PO BOX 1192, SAN ANTONIO, TX 78294-1192
PO BOX 1193, SAN ANTONIO, TX 78294-1193
PO BOX 1194, SAN ANTONIO, TX 78294-1194
PO BOX 1195, SAN ANTONIO, TX 78294-1195
PO BOX 1196, SAN ANTONIO, TX 78294-1196
PO BOX 1197, SAN ANTONIO, TX 78294-1197
PO BOX 1198, SAN ANTONIO, TX 78294-1198
PO BOX 1199, SAN ANTONIO, TX 78294-1199
PO BOX 1200, SAN ANTONIO, TX 78294-1200
PO BOX 1201, SAN ANTONIO, TX 78294-1201
PO BOX 1202, SAN ANTONIO, TX 78294-1202
PO BOX 1203, SAN ANTONIO, TX 78294-1203
PO BOX 1204, SAN ANTONIO, TX 78294-1204
PO BOX 1205, SAN ANTONIO, TX 78294-1205
PO BOX 1206, SAN ANTONIO, TX 78294-1206
PO BOX 1207, SAN ANTONIO, TX 78294-1207
PO BOX 1208, SAN ANTONIO, TX 78294-1208
PO BOX 1209, SAN ANTONIO, TX 78294-1209
PO BOX 1210, SAN ANTONIO, TX 78294-1210
PO BOX 1211, SAN ANTONIO, TX 78294-1211
PO BOX 1212, SAN ANTONIO, TX 78294-1212
PO BOX 1213, SAN ANTONIO, TX 78294-1213
PO BOX 1214, SAN ANTONIO, TX 78294-1214
PO BOX 1215, SAN ANTONIO, TX 78294-1215
PO BOX 1216, SAN ANTONIO, TX 78294-1216
PO BOX 1217, SAN ANTONIO, TX 78294-1217
PO BOX 1218, SAN ANTONIO, TX 78294-1218
PO BOX 1219, SAN ANTONIO, TX 78294-1219
PO BOX 1220, SAN ANTONIO, TX 78294-1220
PO BOX 1221, SAN ANTONIO, TX 78294-1221
PO BOX 1222, SAN ANTONIO, TX 78294-1222
PO BOX 1223, SAN ANTONIO, TX 78294-1223
PO BOX 1224, SAN ANTONIO, TX 78294-1224
PO BOX 1225, SAN ANTONIO, TX 78294-1225
PO BOX 1226, SAN ANTONIO, TX 78294-1226
PO BOX 1227, SAN ANTONIO, TX 78294-1227
PO BOX 1228, SAN ANTONIO, TX 78294-1228
PO BOX 1229, SAN ANTONIO, TX 78294-1229
PO BOX 1230, SAN ANTONIO, TX 78294-1230
PO BOX 1231, SAN ANTONIO, TX 78294-1231
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