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 1021, BROWNSVILLE, PA 15417-0721
PO BOX 1022, BROWNSVILLE, PA 15417-0722
PO BOX 1023, BROWNSVILLE, PA 15417-0723
PO BOX 1024, BROWNSVILLE, PA 15417-0724
PO BOX 1025, BROWNSVILLE, PA 15417-0725
PO BOX 1026, BROWNSVILLE, PA 15417-0726
PO BOX 1027, BROWNSVILLE, PA 15417-0727
PO BOX 1028, BROWNSVILLE, PA 15417-0728
PO BOX 1029, BROWNSVILLE, PA 15417-0729
PO BOX 1030, BROWNSVILLE, PA 15417-0730
PO BOX 1031, BROWNSVILLE, PA 15417-0731
PO BOX 1032, BROWNSVILLE, PA 15417-0732
PO BOX 1033, BROWNSVILLE, PA 15417-0733
PO BOX 1034, BROWNSVILLE, PA 15417-0734
PO BOX 1035, BROWNSVILLE, PA 15417-0735
PO BOX 1036, BROWNSVILLE, PA 15417-0736
PO BOX 1037, BROWNSVILLE, PA 15417-0737
PO BOX 1038, BROWNSVILLE, PA 15417-0738
PO BOX 1039, BROWNSVILLE, PA 15417-0739
PO BOX 1040, BROWNSVILLE, PA 15417-0740
PO BOX 1041, BROWNSVILLE, PA 15417-0741
PO BOX 1042, BROWNSVILLE, PA 15417-0742
PO BOX 1043, BROWNSVILLE, PA 15417-0743
PO BOX 1044, BROWNSVILLE, PA 15417-0744
PO BOX 1045, BROWNSVILLE, PA 15417-0745
PO BOX 1046, BROWNSVILLE, PA 15417-0746
PO BOX 1047, BROWNSVILLE, PA 15417-0747
PO BOX 1048, BROWNSVILLE, PA 15417-0748
PO BOX 1049, BROWNSVILLE, PA 15417-0749
PO BOX 1050, BROWNSVILLE, PA 15417-0750
PO BOX 1051, BROWNSVILLE, PA 15417-0751
PO BOX 1052, BROWNSVILLE, PA 15417-0752
PO BOX 1053, BROWNSVILLE, PA 15417-0753
PO BOX 1054, BROWNSVILLE, PA 15417-0754
PO BOX 1055, BROWNSVILLE, PA 15417-0755
PO BOX 1056, BROWNSVILLE, PA 15417-0756
PO BOX 1057, BROWNSVILLE, PA 15417-0757
PO BOX 1058, BROWNSVILLE, PA 15417-0758
PO BOX 1059, BROWNSVILLE, PA 15417-0759
PO BOX 1060, BROWNSVILLE, PA 15417-0760
PO BOX 1061, BROWNSVILLE, PA 15417-0761
PO BOX 1062, BROWNSVILLE, PA 15417-0762
PO BOX 1063, BROWNSVILLE, PA 15417-0763
PO BOX 1064, BROWNSVILLE, PA 15417-0764
PO BOX 1065, BROWNSVILLE, PA 15417-0765
PO BOX 1066, BROWNSVILLE, PA 15417-0766
PO BOX 1067, BROWNSVILLE, PA 15417-0767
PO BOX 1068, BROWNSVILLE, PA 15417-0768
PO BOX 1069, BROWNSVILLE, PA 15417-0769
PO BOX 1070, BROWNSVILLE, PA 15417-0770
PO BOX 1071, BROWNSVILLE, PA 15417-0771
PO BOX 1072, BROWNSVILLE, PA 15417-0772
PO BOX 1073, BROWNSVILLE, PA 15417-0773
PO BOX 1074, BROWNSVILLE, PA 15417-0774
PO BOX 1075, BROWNSVILLE, PA 15417-0775
PO BOX 1076, BROWNSVILLE, PA 15417-0776
PO BOX 1077, BROWNSVILLE, PA 15417-0777
PO BOX 1078, BROWNSVILLE, PA 15417-0778
PO BOX 1079, BROWNSVILLE, PA 15417-0779
PO BOX 1080, BROWNSVILLE, PA 15417-0780
PO BOX 1081, BROWNSVILLE, PA 15417-0781
PO BOX 1082, BROWNSVILLE, PA 15417-0782
PO BOX 1083, BROWNSVILLE, PA 15417-0783
PO BOX 1084, BROWNSVILLE, PA 15417-0784
PO BOX 1085, BROWNSVILLE, PA 15417-0785
PO BOX 1086, BROWNSVILLE, PA 15417-0786
PO BOX 1087, BROWNSVILLE, PA 15417-0787
PO BOX 1088, BROWNSVILLE, PA 15417-0788
PO BOX 1089, BROWNSVILLE, PA 15417-0789
PO BOX 1090, BROWNSVILLE, PA 15417-0790
PO BOX 1091, BROWNSVILLE, PA 15417-0791
PO BOX 1092, BROWNSVILLE, PA 15417-0792
PO BOX 1093, BROWNSVILLE, PA 15417-0793
PO BOX 1094, BROWNSVILLE, PA 15417-0794
PO BOX 1095, BROWNSVILLE, PA 15417-0795
PO BOX 1096, BROWNSVILLE, PA 15417-0796
PO BOX 1097, BROWNSVILLE, PA 15417-0797
PO BOX 1098, BROWNSVILLE, PA 15417-0798
PO BOX 1099, BROWNSVILLE, PA 15417-0799
PO BOX 1100, BROWNSVILLE, PA 15417-0800
PO BOX 1101, BROWNSVILLE, PA 15417-0801
PO BOX 1102, BROWNSVILLE, PA 15417-0802
PO BOX 1103, BROWNSVILLE, PA 15417-0803
PO BOX 1104, BROWNSVILLE, PA 15417-0804
PO BOX 1105, BROWNSVILLE, PA 15417-0805
PO BOX 1106, BROWNSVILLE, PA 15417-0806
PO BOX 1107, BROWNSVILLE, PA 15417-0807
PO BOX 1108, BROWNSVILLE, PA 15417-0808
PO BOX 1109, BROWNSVILLE, PA 15417-0809
PO BOX 1110, BROWNSVILLE, PA 15417-0810
PO BOX 1111, BROWNSVILLE, PA 15417-0811
PO BOX 1112, BROWNSVILLE, PA 15417-0812
PO BOX 1113, BROWNSVILLE, PA 15417-0813
PO BOX 1114, BROWNSVILLE, PA 15417-0814
PO BOX 1115, BROWNSVILLE, PA 15417-0815
PO BOX 1116, BROWNSVILLE, PA 15417-0816
PO BOX 1117, BROWNSVILLE, PA 15417-0817
PO BOX 1118, BROWNSVILLE, PA 15417-0818
PO BOX 1119, BROWNSVILLE, PA 15417-0819
PO BOX 1120, BROWNSVILLE, PA 15417-0820
PO BOX 1121, BROWNSVILLE, PA 15417-0821
PO BOX 1122, BROWNSVILLE, PA 15417-0822
PO BOX 1123, BROWNSVILLE, PA 15417-0823
PO BOX 1124, BROWNSVILLE, PA 15417-0824
PO BOX 1125, BROWNSVILLE, PA 15417-0825
PO BOX 1126, BROWNSVILLE, PA 15417-0826
PO BOX 1127, BROWNSVILLE, PA 15417-0827
PO BOX 1128, BROWNSVILLE, PA 15417-0828
PO BOX 1129, BROWNSVILLE, PA 15417-0829
PO BOX 1130, BROWNSVILLE, PA 15417-0830
PO BOX 1131, BROWNSVILLE, PA 15417-0831
PO BOX 1132, BROWNSVILLE, PA 15417-0832
PO BOX 1133, BROWNSVILLE, PA 15417-0833
PO BOX 1134, BROWNSVILLE, PA 15417-0834
PO BOX 1135, BROWNSVILLE, PA 15417-0835
PO BOX 1136, BROWNSVILLE, PA 15417-0836
PO BOX 1137, BROWNSVILLE, PA 15417-0837
PO BOX 1138, BROWNSVILLE, PA 15417-0838
PO BOX 1139, BROWNSVILLE, PA 15417-0839
PO BOX 1140, BROWNSVILLE, PA 15417-0840
PO BOX 1141, BROWNSVILLE, PA 15417-0841
PO BOX 1142, BROWNSVILLE, PA 15417-0842
PO BOX 1143, BROWNSVILLE, PA 15417-0843
PO BOX 1144, BROWNSVILLE, PA 15417-0844
PO BOX 1145, BROWNSVILLE, PA 15417-0845
PO BOX 1146, BROWNSVILLE, PA 15417-0846
PO BOX 1147, BROWNSVILLE, PA 15417-0847
PO BOX 1148, BROWNSVILLE, PA 15417-0848
PO BOX 1149, BROWNSVILLE, PA 15417-0849
PO BOX 1150, BROWNSVILLE, PA 15417-0850
PO BOX 1151, BROWNSVILLE, PA 15417-0851
PO BOX 1152, BROWNSVILLE, PA 15417-0852
PO BOX 1153, BROWNSVILLE, PA 15417-0853
PO BOX 1154, BROWNSVILLE, PA 15417-0854
PO BOX 1155, BROWNSVILLE, PA 15417-0855
PO BOX 1156, BROWNSVILLE, PA 15417-0856
PO BOX 1157, BROWNSVILLE, PA 15417-0857
PO BOX 1158, BROWNSVILLE, PA 15417-0858
PO BOX 1159, BROWNSVILLE, PA 15417-0859
PO BOX 1160, BROWNSVILLE, PA 15417-0860
PO BOX 1161, BROWNSVILLE, PA 15417-0861
PO BOX 1162, BROWNSVILLE, PA 15417-0862
PO BOX 1163, BROWNSVILLE, PA 15417-0863
PO BOX 1164, BROWNSVILLE, PA 15417-0864
PO BOX 1165, BROWNSVILLE, PA 15417-0865
PO BOX 1166, BROWNSVILLE, PA 15417-0866
PO BOX 1167, BROWNSVILLE, PA 15417-0867
PO BOX 1168, BROWNSVILLE, PA 15417-0868
PO BOX 1169, BROWNSVILLE, PA 15417-0869
PO BOX 1170, BROWNSVILLE, PA 15417-0870
PO BOX 1171, BROWNSVILLE, PA 15417-0871
PO BOX 1172, BROWNSVILLE, PA 15417-0872
PO BOX 1173, BROWNSVILLE, PA 15417-0873
PO BOX 1174, BROWNSVILLE, PA 15417-0874
PO BOX 1175, BROWNSVILLE, PA 15417-0875
PO BOX 1176, BROWNSVILLE, PA 15417-0876
PO BOX 1177, BROWNSVILLE, PA 15417-0877
PO BOX 1178, BROWNSVILLE, PA 15417-0878
PO BOX 1179, BROWNSVILLE, PA 15417-0879
PO BOX 1180, BROWNSVILLE, PA 15417-0880
PO BOX 1181, BROWNSVILLE, PA 15417-0881
PO BOX 1182, BROWNSVILLE, PA 15417-0882
PO BOX 1183, BROWNSVILLE, PA 15417-0883
PO BOX 1184, BROWNSVILLE, PA 15417-0884
PO BOX 1185, BROWNSVILLE, PA 15417-0885
PO BOX 1186, BROWNSVILLE, PA 15417-0886
PO BOX 1187, BROWNSVILLE, PA 15417-0887
PO BOX 1188, BROWNSVILLE, PA 15417-0888
PO BOX 1189, BROWNSVILLE, PA 15417-0889
PO BOX 1190, BROWNSVILLE, PA 15417-0890
PO BOX 1191, BROWNSVILLE, PA 15417-0891
PO BOX 1192, BROWNSVILLE, PA 15417-0892
PO BOX 1193, BROWNSVILLE, PA 15417-0893
PO BOX 1194, BROWNSVILLE, PA 15417-0894
PO BOX 1195, BROWNSVILLE, PA 15417-0895
PO BOX 1196, BROWNSVILLE, PA 15417-0896
PO BOX 1197, BROWNSVILLE, PA 15417-0897
PO BOX 1198, BROWNSVILLE, PA 15417-0898
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