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 7001, MAYAGUEZ, PR 00681-7001
PO BOX 7002, MAYAGUEZ, PR 00681-7002
PO BOX 7003, MAYAGUEZ, PR 00681-7003
PO BOX 7004, MAYAGUEZ, PR 00681-7004
PO BOX 7005, MAYAGUEZ, PR 00681-7005
PO BOX 7006, MAYAGUEZ, PR 00681-7006
PO BOX 7007, MAYAGUEZ, PR 00681-7007
PO BOX 7008, MAYAGUEZ, PR 00681-7008
PO BOX 7009, MAYAGUEZ, PR 00681-7009
PO BOX 7010, MAYAGUEZ, PR 00681-7010
PO BOX 7011, MAYAGUEZ, PR 00681-7011
PO BOX 7012, MAYAGUEZ, PR 00681-7012
PO BOX 7013, MAYAGUEZ, PR 00681-7013
PO BOX 7014, MAYAGUEZ, PR 00681-7014
PO BOX 7015, MAYAGUEZ, PR 00681-7015
PO BOX 7016, MAYAGUEZ, PR 00681-7016
PO BOX 7017, MAYAGUEZ, PR 00681-7017
PO BOX 7018, MAYAGUEZ, PR 00681-7018
PO BOX 7019, MAYAGUEZ, PR 00681-7019
PO BOX 7020, MAYAGUEZ, PR 00681-7020
PO BOX 7021, MAYAGUEZ, PR 00681-7021
PO BOX 7022, MAYAGUEZ, PR 00681-7022
PO BOX 7023, MAYAGUEZ, PR 00681-7023
PO BOX 7024, MAYAGUEZ, PR 00681-7024
PO BOX 7025, MAYAGUEZ, PR 00681-7025
PO BOX 7026, MAYAGUEZ, PR 00681-7026
PO BOX 7027, MAYAGUEZ, PR 00681-7027
PO BOX 7028, MAYAGUEZ, PR 00681-7028
PO BOX 7029, MAYAGUEZ, PR 00681-7029
PO BOX 7030, MAYAGUEZ, PR 00681-7030
PO BOX 7031, MAYAGUEZ, PR 00681-7031
PO BOX 7032, MAYAGUEZ, PR 00681-7032
PO BOX 7033, MAYAGUEZ, PR 00681-7033
PO BOX 7034, MAYAGUEZ, PR 00681-7034
PO BOX 7035, MAYAGUEZ, PR 00681-7035
PO BOX 7036, MAYAGUEZ, PR 00681-7036
PO BOX 7037, MAYAGUEZ, PR 00681-7037
PO BOX 7038, MAYAGUEZ, PR 00681-7038
PO BOX 7039, MAYAGUEZ, PR 00681-7039
PO BOX 7040, MAYAGUEZ, PR 00681-7040
PO BOX 7041, MAYAGUEZ, PR 00681-7041
PO BOX 7042, MAYAGUEZ, PR 00681-7042
PO BOX 7043, MAYAGUEZ, PR 00681-7043
PO BOX 7044, MAYAGUEZ, PR 00681-7044
PO BOX 7045, MAYAGUEZ, PR 00681-7045
PO BOX 7046, MAYAGUEZ, PR 00681-7046
PO BOX 7047, MAYAGUEZ, PR 00681-7047
PO BOX 7048, MAYAGUEZ, PR 00681-7048
PO BOX 7049, MAYAGUEZ, PR 00681-7049
PO BOX 7050, MAYAGUEZ, PR 00681-7050
PO BOX 7051, MAYAGUEZ, PR 00681-7051
PO BOX 7052, MAYAGUEZ, PR 00681-7052
PO BOX 7053, MAYAGUEZ, PR 00681-7053
PO BOX 7054, MAYAGUEZ, PR 00681-7054
PO BOX 7055, MAYAGUEZ, PR 00681-7055
PO BOX 7056, MAYAGUEZ, PR 00681-7056
PO BOX 7057, MAYAGUEZ, PR 00681-7057
PO BOX 7058, MAYAGUEZ, PR 00681-7058
PO BOX 7059, MAYAGUEZ, PR 00681-7059
PO BOX 7060, MAYAGUEZ, PR 00681-7060
PO BOX 7061, MAYAGUEZ, PR 00681-7061
PO BOX 7062, MAYAGUEZ, PR 00681-7062
PO BOX 7063, MAYAGUEZ, PR 00681-7063
PO BOX 7064, MAYAGUEZ, PR 00681-7064
PO BOX 7065, MAYAGUEZ, PR 00681-7065
PO BOX 7066, MAYAGUEZ, PR 00681-7066
PO BOX 7067, MAYAGUEZ, PR 00681-7067
PO BOX 7068, MAYAGUEZ, PR 00681-7068
PO BOX 7069, MAYAGUEZ, PR 00681-7069
PO BOX 7070, MAYAGUEZ, PR 00681-7070
PO BOX 7071, MAYAGUEZ, PR 00681-7071
PO BOX 7072, MAYAGUEZ, PR 00681-7072
PO BOX 7073, MAYAGUEZ, PR 00681-7073
PO BOX 7074, MAYAGUEZ, PR 00681-7074
PO BOX 7075, MAYAGUEZ, PR 00681-7075
PO BOX 7076, MAYAGUEZ, PR 00681-7076
PO BOX 7077, MAYAGUEZ, PR 00681-7077
PO BOX 7078, MAYAGUEZ, PR 00681-7078
PO BOX 7079, MAYAGUEZ, PR 00681-7079
PO BOX 7080, MAYAGUEZ, PR 00681-7080
PO BOX 7081, MAYAGUEZ, PR 00681-7081
PO BOX 7082, MAYAGUEZ, PR 00681-7082
PO BOX 7083, MAYAGUEZ, PR 00681-7083
PO BOX 7084, MAYAGUEZ, PR 00681-7084
PO BOX 7085, MAYAGUEZ, PR 00681-7085
PO BOX 7086, MAYAGUEZ, PR 00681-7086
PO BOX 7087, MAYAGUEZ, PR 00681-7087
PO BOX 7088, MAYAGUEZ, PR 00681-7088
PO BOX 7089, MAYAGUEZ, PR 00681-7089
PO BOX 7090, MAYAGUEZ, PR 00681-7090
PO BOX 7091, MAYAGUEZ, PR 00681-7091
PO BOX 7092, MAYAGUEZ, PR 00681-7092
PO BOX 7093, MAYAGUEZ, PR 00681-7093
PO BOX 7094, MAYAGUEZ, PR 00681-7094
PO BOX 7095, MAYAGUEZ, PR 00681-7095
PO BOX 7096, MAYAGUEZ, PR 00681-7096
PO BOX 7097, MAYAGUEZ, PR 00681-7097
PO BOX 7098, MAYAGUEZ, PR 00681-7098
PO BOX 7099, MAYAGUEZ, PR 00681-7099
PO BOX 7100, MAYAGUEZ, PR 00681-7100
PO BOX 7101, MAYAGUEZ, PR 00681-7101
PO BOX 7102, MAYAGUEZ, PR 00681-7102
PO BOX 7103, MAYAGUEZ, PR 00681-7103
PO BOX 7104, MAYAGUEZ, PR 00681-7104
PO BOX 7105, MAYAGUEZ, PR 00681-7105
PO BOX 7106, MAYAGUEZ, PR 00681-7106
PO BOX 7107, MAYAGUEZ, PR 00681-7107
PO BOX 7108, MAYAGUEZ, PR 00681-7108
PO BOX 7109, MAYAGUEZ, PR 00681-7109
PO BOX 7110, MAYAGUEZ, PR 00681-7110
PO BOX 7111, MAYAGUEZ, PR 00681-7111
PO BOX 7112, MAYAGUEZ, PR 00681-7112
PO BOX 7113, MAYAGUEZ, PR 00681-7113
PO BOX 7114, MAYAGUEZ, PR 00681-7114
PO BOX 7115, MAYAGUEZ, PR 00681-7115
PO BOX 7116, MAYAGUEZ, PR 00681-7116
PO BOX 7117, MAYAGUEZ, PR 00681-7117
PO BOX 7118, MAYAGUEZ, PR 00681-7118
PO BOX 7119, MAYAGUEZ, PR 00681-7119
PO BOX 7120, MAYAGUEZ, PR 00681-7120
PO BOX 7121, MAYAGUEZ, PR 00681-7121
PO BOX 7122, MAYAGUEZ, PR 00681-7122
PO BOX 7123, MAYAGUEZ, PR 00681-7123
PO BOX 7124, MAYAGUEZ, PR 00681-7124
PO BOX 7125, MAYAGUEZ, PR 00681-7125
PO BOX 7126, MAYAGUEZ, PR 00681-7126
PO BOX 7127, MAYAGUEZ, PR 00681-7127
PO BOX 7128, MAYAGUEZ, PR 00681-7128
PO BOX 7129, MAYAGUEZ, PR 00681-7129
PO BOX 7130, MAYAGUEZ, PR 00681-7130
PO BOX 7131, MAYAGUEZ, PR 00681-7131
PO BOX 7132, MAYAGUEZ, PR 00681-7132
PO BOX 7133, MAYAGUEZ, PR 00681-7133
PO BOX 7134, MAYAGUEZ, PR 00681-7134
PO BOX 7135, MAYAGUEZ, PR 00681-7135
PO BOX 7136, MAYAGUEZ, PR 00681-7136
PO BOX 7137, MAYAGUEZ, PR 00681-7137
PO BOX 7138, MAYAGUEZ, PR 00681-7138
PO BOX 7139, MAYAGUEZ, PR 00681-7139
PO BOX 7140, MAYAGUEZ, PR 00681-7140
PO BOX 7141, MAYAGUEZ, PR 00681-7141
PO BOX 7142, MAYAGUEZ, PR 00681-7142
PO BOX 7143, MAYAGUEZ, PR 00681-7143
PO BOX 7144, MAYAGUEZ, PR 00681-7144
PO BOX 7145, MAYAGUEZ, PR 00681-7145
PO BOX 7146, MAYAGUEZ, PR 00681-7146
PO BOX 7147, MAYAGUEZ, PR 00681-7147
PO BOX 7148, MAYAGUEZ, PR 00681-7148
PO BOX 7149, MAYAGUEZ, PR 00681-7149
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