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 701, BROWNSVILLE, PA 15417-1001
PO BOX 702, BROWNSVILLE, PA 15417-1002
PO BOX 703, BROWNSVILLE, PA 15417-1003
PO BOX 704, BROWNSVILLE, PA 15417-1004
PO BOX 705, BROWNSVILLE, PA 15417-1005
PO BOX 706, BROWNSVILLE, PA 15417-1006
PO BOX 707, BROWNSVILLE, PA 15417-1007
PO BOX 708, BROWNSVILLE, PA 15417-1008
PO BOX 709, BROWNSVILLE, PA 15417-1009
PO BOX 710, BROWNSVILLE, PA 15417-1010
PO BOX 711, BROWNSVILLE, PA 15417-1011
PO BOX 712, BROWNSVILLE, PA 15417-1012
PO BOX 713, BROWNSVILLE, PA 15417-1013
PO BOX 714, BROWNSVILLE, PA 15417-1014
PO BOX 715, BROWNSVILLE, PA 15417-1015
PO BOX 716, BROWNSVILLE, PA 15417-1016
PO BOX 717, BROWNSVILLE, PA 15417-1017
PO BOX 718, BROWNSVILLE, PA 15417-1018
PO BOX 719, BROWNSVILLE, PA 15417-1019
PO BOX 720, BROWNSVILLE, PA 15417-1020
PO BOX 721, BROWNSVILLE, PA 15417-1021
PO BOX 722, BROWNSVILLE, PA 15417-1022
PO BOX 723, BROWNSVILLE, PA 15417-1023
PO BOX 724, BROWNSVILLE, PA 15417-1024
PO BOX 725, BROWNSVILLE, PA 15417-1025
PO BOX 726, BROWNSVILLE, PA 15417-1026
PO BOX 727, BROWNSVILLE, PA 15417-1027
PO BOX 728, BROWNSVILLE, PA 15417-1028
PO BOX 729, BROWNSVILLE, PA 15417-1029
PO BOX 730, BROWNSVILLE, PA 15417-1030
PO BOX 731, BROWNSVILLE, PA 15417-1031
PO BOX 732, BROWNSVILLE, PA 15417-1032
PO BOX 733, BROWNSVILLE, PA 15417-1033
PO BOX 734, BROWNSVILLE, PA 15417-1034
PO BOX 735, BROWNSVILLE, PA 15417-1035
PO BOX 736, BROWNSVILLE, PA 15417-1036
PO BOX 737, BROWNSVILLE, PA 15417-1037
PO BOX 738, BROWNSVILLE, PA 15417-1038
PO BOX 739, BROWNSVILLE, PA 15417-1039
PO BOX 740, BROWNSVILLE, PA 15417-1040
PO BOX 741, BROWNSVILLE, PA 15417-1041
PO BOX 742, BROWNSVILLE, PA 15417-1042
PO BOX 743, BROWNSVILLE, PA 15417-1043
PO BOX 744, BROWNSVILLE, PA 15417-1044
PO BOX 745, BROWNSVILLE, PA 15417-1045
PO BOX 746, BROWNSVILLE, PA 15417-1046
PO BOX 747, BROWNSVILLE, PA 15417-1047
PO BOX 748, BROWNSVILLE, PA 15417-1048
PO BOX 749, BROWNSVILLE, PA 15417-1049
PO BOX 750, BROWNSVILLE, PA 15417-1050
PO BOX 751, BROWNSVILLE, PA 15417-1051
PO BOX 752, BROWNSVILLE, PA 15417-1052
PO BOX 753, BROWNSVILLE, PA 15417-1053
PO BOX 754, BROWNSVILLE, PA 15417-1054
PO BOX 755, BROWNSVILLE, PA 15417-1055
PO BOX 756, BROWNSVILLE, PA 15417-1056
PO BOX 757, BROWNSVILLE, PA 15417-1057
PO BOX 758, BROWNSVILLE, PA 15417-1058
PO BOX 759, BROWNSVILLE, PA 15417-1059
PO BOX 760, BROWNSVILLE, PA 15417-1060
PO BOX 761, BROWNSVILLE, PA 15417-1061
PO BOX 762, BROWNSVILLE, PA 15417-1062
PO BOX 763, BROWNSVILLE, PA 15417-1063
PO BOX 764, BROWNSVILLE, PA 15417-1064
PO BOX 765, BROWNSVILLE, PA 15417-1065
PO BOX 766, BROWNSVILLE, PA 15417-1066
PO BOX 767, BROWNSVILLE, PA 15417-1067
PO BOX 768, BROWNSVILLE, PA 15417-1068
PO BOX 769, BROWNSVILLE, PA 15417-1069
PO BOX 770, BROWNSVILLE, PA 15417-1070
PO BOX 771, BROWNSVILLE, PA 15417-1071
PO BOX 772, BROWNSVILLE, PA 15417-1072
PO BOX 773, BROWNSVILLE, PA 15417-1073
PO BOX 774, BROWNSVILLE, PA 15417-1074
PO BOX 775, BROWNSVILLE, PA 15417-1075
PO BOX 776, BROWNSVILLE, PA 15417-1076
PO BOX 777, BROWNSVILLE, PA 15417-1077
PO BOX 778, BROWNSVILLE, PA 15417-1078
PO BOX 779, BROWNSVILLE, PA 15417-1079
PO BOX 780, BROWNSVILLE, PA 15417-1080
PO BOX 781, BROWNSVILLE, PA 15417-1081
PO BOX 782, BROWNSVILLE, PA 15417-1082
PO BOX 783, BROWNSVILLE, PA 15417-1083
PO BOX 784, BROWNSVILLE, PA 15417-1084
PO BOX 785, BROWNSVILLE, PA 15417-1085
PO BOX 786, BROWNSVILLE, PA 15417-1086
PO BOX 787, BROWNSVILLE, PA 15417-1087
PO BOX 788, BROWNSVILLE, PA 15417-1088
PO BOX 789, BROWNSVILLE, PA 15417-1089
PO BOX 790, BROWNSVILLE, PA 15417-1090
PO BOX 791, BROWNSVILLE, PA 15417-1091
PO BOX 792, BROWNSVILLE, PA 15417-1092
PO BOX 793, BROWNSVILLE, PA 15417-1093
PO BOX 794, BROWNSVILLE, PA 15417-1094
PO BOX 795, BROWNSVILLE, PA 15417-1095
PO BOX 796, BROWNSVILLE, PA 15417-1096
PO BOX 797, BROWNSVILLE, PA 15417-1097
PO BOX 798, BROWNSVILLE, PA 15417-1098
PO BOX 799, BROWNSVILLE, PA 15417-1099
PO BOX 800, BROWNSVILLE, PA 15417-1100
PO BOX 801, BROWNSVILLE, PA 15417-1101
PO BOX 802, BROWNSVILLE, PA 15417-1102
PO BOX 803, BROWNSVILLE, PA 15417-1103
PO BOX 804, BROWNSVILLE, PA 15417-1104
PO BOX 805, BROWNSVILLE, PA 15417-1105
PO BOX 806, BROWNSVILLE, PA 15417-1106
PO BOX 807, BROWNSVILLE, PA 15417-1107
PO BOX 808, BROWNSVILLE, PA 15417-1108
PO BOX 809, BROWNSVILLE, PA 15417-1109
PO BOX 810, BROWNSVILLE, PA 15417-1110
PO BOX 811, BROWNSVILLE, PA 15417-1111
PO BOX 812, BROWNSVILLE, PA 15417-1112
PO BOX 813, BROWNSVILLE, PA 15417-1113
PO BOX 814, BROWNSVILLE, PA 15417-1114
PO BOX 815, BROWNSVILLE, PA 15417-1115
PO BOX 816, BROWNSVILLE, PA 15417-1116
PO BOX 817, BROWNSVILLE, PA 15417-1117
PO BOX 818, BROWNSVILLE, PA 15417-1118
PO BOX 819, BROWNSVILLE, PA 15417-1119
PO BOX 820, BROWNSVILLE, PA 15417-1120
PO BOX 821, BROWNSVILLE, PA 15417-1121
PO BOX 822, BROWNSVILLE, PA 15417-1122
PO BOX 823, BROWNSVILLE, PA 15417-1123
PO BOX 824, BROWNSVILLE, PA 15417-1124
PO BOX 825, BROWNSVILLE, PA 15417-1125
PO BOX 826, BROWNSVILLE, PA 15417-1126
PO BOX 827, BROWNSVILLE, PA 15417-1127
PO BOX 828, BROWNSVILLE, PA 15417-1128
PO BOX 829, BROWNSVILLE, PA 15417-1129
PO BOX 830, BROWNSVILLE, PA 15417-1130
PO BOX 831, BROWNSVILLE, PA 15417-1131
PO BOX 832, BROWNSVILLE, PA 15417-1132
PO BOX 833, BROWNSVILLE, PA 15417-1133
PO BOX 834, BROWNSVILLE, PA 15417-1134
PO BOX 835, BROWNSVILLE, PA 15417-1135
PO BOX 836, BROWNSVILLE, PA 15417-1136
PO BOX 837, BROWNSVILLE, PA 15417-1137
PO BOX 838, BROWNSVILLE, PA 15417-1138
PO BOX 839, BROWNSVILLE, PA 15417-1139
PO BOX 840, BROWNSVILLE, PA 15417-1140
PO BOX 841, BROWNSVILLE, PA 15417-1141
PO BOX 842, BROWNSVILLE, PA 15417-1142
PO BOX 843, BROWNSVILLE, PA 15417-1143
PO BOX 844, BROWNSVILLE, PA 15417-1144
PO BOX 845, BROWNSVILLE, PA 15417-1145
PO BOX 846, BROWNSVILLE, PA 15417-1146
PO BOX 847, BROWNSVILLE, PA 15417-1147
PO BOX 848, BROWNSVILLE, PA 15417-1148
PO BOX 849, BROWNSVILLE, PA 15417-1149
PO BOX 850, BROWNSVILLE, PA 15417-1150
PO BOX 851, BROWNSVILLE, PA 15417-1151
PO BOX 852, BROWNSVILLE, PA 15417-1152
PO BOX 853, BROWNSVILLE, PA 15417-1153
PO BOX 854, BROWNSVILLE, PA 15417-1154
PO BOX 855, BROWNSVILLE, PA 15417-1155
PO BOX 856, BROWNSVILLE, PA 15417-1156
PO BOX 857, BROWNSVILLE, PA 15417-1157
PO BOX 858, BROWNSVILLE, PA 15417-1158
PO BOX 859, BROWNSVILLE, PA 15417-1159
PO BOX 860, BROWNSVILLE, PA 15417-1160
PO BOX 861, BROWNSVILLE, PA 15417-1161
PO BOX 862, BROWNSVILLE, PA 15417-1162
PO BOX 863, BROWNSVILLE, PA 15417-1163
PO BOX 864, BROWNSVILLE, PA 15417-1164
PO BOX 865, BROWNSVILLE, PA 15417-1165
PO BOX 866, BROWNSVILLE, PA 15417-1166
PO BOX 867, BROWNSVILLE, PA 15417-1167
PO BOX 868, BROWNSVILLE, PA 15417-1168
PO BOX 869, BROWNSVILLE, PA 15417-1169
PO BOX 870, BROWNSVILLE, PA 15417-1170
PO BOX 871, BROWNSVILLE, PA 15417-1171
PO BOX 872, BROWNSVILLE, PA 15417-1172
PO BOX 873, BROWNSVILLE, PA 15417-1173
PO BOX 874, BROWNSVILLE, PA 15417-1174
PO BOX 875, BROWNSVILLE, PA 15417-1175
PO BOX 876, BROWNSVILLE, PA 15417-1176
PO BOX 877, BROWNSVILLE, PA 15417-1177
PO BOX 878, BROWNSVILLE, PA 15417-1178
PO BOX 879, BROWNSVILLE, PA 15417-1179
PO BOX 880, BROWNSVILLE, PA 15417-1180
PO BOX 881, BROWNSVILLE, PA 15417-1181
PO BOX 882, BROWNSVILLE, PA 15417-1182
PO BOX 883, BROWNSVILLE, PA 15417-1183
PO BOX 884, BROWNSVILLE, PA 15417-1184
PO BOX 885, BROWNSVILLE, PA 15417-1185
PO BOX 886, BROWNSVILLE, PA 15417-1186
PO BOX 887, BROWNSVILLE, PA 15417-1187
PO BOX 888, BROWNSVILLE, PA 15417-1188
PO BOX 889, BROWNSVILLE, PA 15417-1189
PO BOX 890, BROWNSVILLE, PA 15417-1190
PO BOX 891, BROWNSVILLE, PA 15417-1191
PO BOX 892, BROWNSVILLE, PA 15417-1192
PO BOX 893, BROWNSVILLE, PA 15417-1193
PO BOX 894, BROWNSVILLE, PA 15417-1194
PO BOX 895, BROWNSVILLE, PA 15417-1195
PO BOX 896, BROWNSVILLE, PA 15417-1196
PO BOX 897, BROWNSVILLE, PA 15417-1197
PO BOX 898, BROWNSVILLE, PA 15417-1198
PO BOX 899, BROWNSVILLE, PA 15417-1199
PO BOX 900, BROWNSVILLE, PA 15417-1200
PO BOX 901, BROWNSVILLE, PA 15417-1201
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