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 21021, TUSCALOOSA, AL 35402-1021
PO BOX 21022, TUSCALOOSA, AL 35402-1022
PO BOX 21023, TUSCALOOSA, AL 35402-1023
PO BOX 21024, TUSCALOOSA, AL 35402-1024
PO BOX 21025, TUSCALOOSA, AL 35402-1025
PO BOX 21026, TUSCALOOSA, AL 35402-1026
PO BOX 21027, TUSCALOOSA, AL 35402-1027
PO BOX 21028, TUSCALOOSA, AL 35402-1028
PO BOX 21029, TUSCALOOSA, AL 35402-1029
PO BOX 21030, TUSCALOOSA, AL 35402-1030
PO BOX 21031, TUSCALOOSA, AL 35402-1031
PO BOX 21032, TUSCALOOSA, AL 35402-1032
PO BOX 21033, TUSCALOOSA, AL 35402-1033
PO BOX 21034, TUSCALOOSA, AL 35402-1034
PO BOX 21035, TUSCALOOSA, AL 35402-1035
PO BOX 21036, TUSCALOOSA, AL 35402-1036
PO BOX 21037, TUSCALOOSA, AL 35402-1037
PO BOX 21038, TUSCALOOSA, AL 35402-1038
PO BOX 21039, TUSCALOOSA, AL 35402-1039
PO BOX 21040, TUSCALOOSA, AL 35402-1040
PO BOX 21041, TUSCALOOSA, AL 35402-1041
PO BOX 21042, TUSCALOOSA, AL 35402-1042
PO BOX 21043, TUSCALOOSA, AL 35402-1043
PO BOX 21044, TUSCALOOSA, AL 35402-1044
PO BOX 21045, TUSCALOOSA, AL 35402-1045
PO BOX 21046, TUSCALOOSA, AL 35402-1046
PO BOX 21047, TUSCALOOSA, AL 35402-1047
PO BOX 21048, TUSCALOOSA, AL 35402-1048
PO BOX 21049, TUSCALOOSA, AL 35402-1049
PO BOX 21050, TUSCALOOSA, AL 35402-1050
PO BOX 21051, TUSCALOOSA, AL 35402-1051
PO BOX 21052, TUSCALOOSA, AL 35402-1052
PO BOX 21053, TUSCALOOSA, AL 35402-1053
PO BOX 21054, TUSCALOOSA, AL 35402-1054
PO BOX 21055, TUSCALOOSA, AL 35402-1055
PO BOX 21056, TUSCALOOSA, AL 35402-1056
PO BOX 21057, TUSCALOOSA, AL 35402-1057
PO BOX 21058, TUSCALOOSA, AL 35402-1058
PO BOX 21059, TUSCALOOSA, AL 35402-1059
PO BOX 21060, TUSCALOOSA, AL 35402-1060
PO BOX 21061, TUSCALOOSA, AL 35402-1061
PO BOX 21062, TUSCALOOSA, AL 35402-1062
PO BOX 21063, TUSCALOOSA, AL 35402-1063
PO BOX 21064, TUSCALOOSA, AL 35402-1064
PO BOX 21065, TUSCALOOSA, AL 35402-1065
PO BOX 21066, TUSCALOOSA, AL 35402-1066
PO BOX 21067, TUSCALOOSA, AL 35402-1067
PO BOX 21068, TUSCALOOSA, AL 35402-1068
PO BOX 21069, TUSCALOOSA, AL 35402-1069
PO BOX 21070, TUSCALOOSA, AL 35402-1070
PO BOX 21071, TUSCALOOSA, AL 35402-1071
PO BOX 21072, TUSCALOOSA, AL 35402-1072
PO BOX 21073, TUSCALOOSA, AL 35402-1073
PO BOX 21074, TUSCALOOSA, AL 35402-1074
PO BOX 21075, TUSCALOOSA, AL 35402-1075
PO BOX 21076, TUSCALOOSA, AL 35402-1076
PO BOX 21077, TUSCALOOSA, AL 35402-1077
PO BOX 21078, TUSCALOOSA, AL 35402-1078
PO BOX 21079, TUSCALOOSA, AL 35402-1079
PO BOX 21080, TUSCALOOSA, AL 35402-1080
PO BOX 21081, TUSCALOOSA, AL 35402-1081
PO BOX 21082, TUSCALOOSA, AL 35402-1082
PO BOX 21083, TUSCALOOSA, AL 35402-1083
PO BOX 21084, TUSCALOOSA, AL 35402-1084
PO BOX 21085, TUSCALOOSA, AL 35402-1085
PO BOX 21086, TUSCALOOSA, AL 35402-1086
PO BOX 21087, TUSCALOOSA, AL 35402-1087
PO BOX 21088, TUSCALOOSA, AL 35402-1088
PO BOX 21089, TUSCALOOSA, AL 35402-1089
PO BOX 21090, TUSCALOOSA, AL 35402-1090
PO BOX 21091, TUSCALOOSA, AL 35402-1091
PO BOX 21092, TUSCALOOSA, AL 35402-1092
PO BOX 21093, TUSCALOOSA, AL 35402-1093
PO BOX 21094, TUSCALOOSA, AL 35402-1094
PO BOX 21095, TUSCALOOSA, AL 35402-1095
PO BOX 21096, TUSCALOOSA, AL 35402-1096
PO BOX 21097, TUSCALOOSA, AL 35402-1097
PO BOX 21098, TUSCALOOSA, AL 35402-1098
PO BOX 21099, TUSCALOOSA, AL 35402-1099
PO BOX 21100, TUSCALOOSA, AL 35402-1100
PO BOX 21101, TUSCALOOSA, AL 35402-1101
PO BOX 21102, TUSCALOOSA, AL 35402-1102
PO BOX 21103, TUSCALOOSA, AL 35402-1103
PO BOX 21104, TUSCALOOSA, AL 35402-1104
PO BOX 21105, TUSCALOOSA, AL 35402-1105
PO BOX 21106, TUSCALOOSA, AL 35402-1106
PO BOX 21107, TUSCALOOSA, AL 35402-1107
PO BOX 21108, TUSCALOOSA, AL 35402-1108
PO BOX 21109, TUSCALOOSA, AL 35402-1109
PO BOX 21110, TUSCALOOSA, AL 35402-1110
PO BOX 21111, TUSCALOOSA, AL 35402-1111
PO BOX 21112, TUSCALOOSA, AL 35402-1112
PO BOX 21113, TUSCALOOSA, AL 35402-1113
PO BOX 21114, TUSCALOOSA, AL 35402-1114
PO BOX 21115, TUSCALOOSA, AL 35402-1115
PO BOX 21116, TUSCALOOSA, AL 35402-1116
PO BOX 21117, TUSCALOOSA, AL 35402-1117
PO BOX 21118, TUSCALOOSA, AL 35402-1118
PO BOX 21119, TUSCALOOSA, AL 35402-1119
PO BOX 21120, TUSCALOOSA, AL 35402-1120
PO BOX 21121, TUSCALOOSA, AL 35402-1121
PO BOX 21122, TUSCALOOSA, AL 35402-1122
PO BOX 21123, TUSCALOOSA, AL 35402-1123
PO BOX 21124, TUSCALOOSA, AL 35402-1124
PO BOX 21125, TUSCALOOSA, AL 35402-1125
PO BOX 21126, TUSCALOOSA, AL 35402-1126
PO BOX 21127, TUSCALOOSA, AL 35402-1127
PO BOX 21128, TUSCALOOSA, AL 35402-1128
PO BOX 21129, TUSCALOOSA, AL 35402-1129
PO BOX 21130, TUSCALOOSA, AL 35402-1130
PO BOX 21131, TUSCALOOSA, AL 35402-1131
PO BOX 21132, TUSCALOOSA, AL 35402-1132
PO BOX 21133, TUSCALOOSA, AL 35402-1133
PO BOX 21134, TUSCALOOSA, AL 35402-1134
PO BOX 21135, TUSCALOOSA, AL 35402-1135
PO BOX 21136, TUSCALOOSA, AL 35402-1136
PO BOX 21137, TUSCALOOSA, AL 35402-1137
PO BOX 21138, TUSCALOOSA, AL 35402-1138
PO BOX 21139, TUSCALOOSA, AL 35402-1139
PO BOX 21140, TUSCALOOSA, AL 35402-1140
PO BOX 21141, TUSCALOOSA, AL 35402-1141
PO BOX 21142, TUSCALOOSA, AL 35402-1142
PO BOX 21143, TUSCALOOSA, AL 35402-1143
PO BOX 21144, TUSCALOOSA, AL 35402-1144
PO BOX 21145, TUSCALOOSA, AL 35402-1145
PO BOX 21146, TUSCALOOSA, AL 35402-1146
PO BOX 21147, TUSCALOOSA, AL 35402-1147
PO BOX 21148, TUSCALOOSA, AL 35402-1148
PO BOX 21149, TUSCALOOSA, AL 35402-1149
PO BOX 21150, TUSCALOOSA, AL 35402-1150
PO BOX 21151, TUSCALOOSA, AL 35402-1151
PO BOX 21152, TUSCALOOSA, AL 35402-1152
PO BOX 21153, TUSCALOOSA, AL 35402-1153
PO BOX 21154, TUSCALOOSA, AL 35402-1154
PO BOX 21155, TUSCALOOSA, AL 35402-1155
PO BOX 21156, TUSCALOOSA, AL 35402-1156
PO BOX 21157, TUSCALOOSA, AL 35402-1157
PO BOX 21158, TUSCALOOSA, AL 35402-1158
PO BOX 21159, TUSCALOOSA, AL 35402-1159
PO BOX 21160, TUSCALOOSA, AL 35402-1160
PO BOX 21161, TUSCALOOSA, AL 35402-1161
PO BOX 21162, TUSCALOOSA, AL 35402-1162
PO BOX 21163, TUSCALOOSA, AL 35402-1163
PO BOX 21164, TUSCALOOSA, AL 35402-1164
PO BOX 21165, TUSCALOOSA, AL 35402-1165
PO BOX 21166, TUSCALOOSA, AL 35402-1166
PO BOX 21167, TUSCALOOSA, AL 35402-1167
PO BOX 21168, TUSCALOOSA, AL 35402-1168
PO BOX 21169, TUSCALOOSA, AL 35402-1169
PO BOX 21170, TUSCALOOSA, AL 35402-1170
PO BOX 21171, TUSCALOOSA, AL 35402-1171
PO BOX 21172, TUSCALOOSA, AL 35402-1172
PO BOX 21173, TUSCALOOSA, AL 35402-1173
PO BOX 21174, TUSCALOOSA, AL 35402-1174
PO BOX 21175, TUSCALOOSA, AL 35402-1175
PO BOX 21176, TUSCALOOSA, AL 35402-1176
PO BOX 21177, TUSCALOOSA, AL 35402-1177
PO BOX 21178, TUSCALOOSA, AL 35402-1178
PO BOX 21179, TUSCALOOSA, AL 35402-1179
PO BOX 21180, TUSCALOOSA, AL 35402-1180
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