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 1, TRUJILLO ALTO, PR 00977-0001
PO BOX 2, TRUJILLO ALTO, PR 00977-0002
PO BOX 3, TRUJILLO ALTO, PR 00977-0003
PO BOX 4, TRUJILLO ALTO, PR 00977-0004
PO BOX 5, TRUJILLO ALTO, PR 00977-0005
PO BOX 6, TRUJILLO ALTO, PR 00977-0006
PO BOX 7, TRUJILLO ALTO, PR 00977-0007
PO BOX 8, TRUJILLO ALTO, PR 00977-0008
PO BOX 9, TRUJILLO ALTO, PR 00977-0009
PO BOX 10, TRUJILLO ALTO, PR 00977-0010
PO BOX 11, TRUJILLO ALTO, PR 00977-0011
PO BOX 12, TRUJILLO ALTO, PR 00977-0012
PO BOX 13, TRUJILLO ALTO, PR 00977-0013
PO BOX 14, TRUJILLO ALTO, PR 00977-0014
PO BOX 15, TRUJILLO ALTO, PR 00977-0015
PO BOX 16, TRUJILLO ALTO, PR 00977-0016
PO BOX 17, TRUJILLO ALTO, PR 00977-0017
PO BOX 18, TRUJILLO ALTO, PR 00977-0018
PO BOX 19, TRUJILLO ALTO, PR 00977-0019
PO BOX 20, TRUJILLO ALTO, PR 00977-0020
PO BOX 21, TRUJILLO ALTO, PR 00977-0021
PO BOX 22, TRUJILLO ALTO, PR 00977-0022
PO BOX 23, TRUJILLO ALTO, PR 00977-0023
PO BOX 24, TRUJILLO ALTO, PR 00977-0024
PO BOX 25, TRUJILLO ALTO, PR 00977-0025
PO BOX 26, TRUJILLO ALTO, PR 00977-0026
PO BOX 27, TRUJILLO ALTO, PR 00977-0027
PO BOX 28, TRUJILLO ALTO, PR 00977-0028
PO BOX 29, TRUJILLO ALTO, PR 00977-0029
PO BOX 30, TRUJILLO ALTO, PR 00977-0030
PO BOX 31, TRUJILLO ALTO, PR 00977-0031
PO BOX 32, TRUJILLO ALTO, PR 00977-0032
PO BOX 33, TRUJILLO ALTO, PR 00977-0033
PO BOX 34, TRUJILLO ALTO, PR 00977-0034
PO BOX 35, TRUJILLO ALTO, PR 00977-0035
PO BOX 36, TRUJILLO ALTO, PR 00977-0036
PO BOX 37, TRUJILLO ALTO, PR 00977-0037
PO BOX 38, TRUJILLO ALTO, PR 00977-0038
PO BOX 39, TRUJILLO ALTO, PR 00977-0039
PO BOX 40, TRUJILLO ALTO, PR 00977-0040
PO BOX 41, TRUJILLO ALTO, PR 00977-0041
PO BOX 42, TRUJILLO ALTO, PR 00977-0042
PO BOX 43, TRUJILLO ALTO, PR 00977-0043
PO BOX 44, TRUJILLO ALTO, PR 00977-0044
PO BOX 45, TRUJILLO ALTO, PR 00977-0045
PO BOX 46, TRUJILLO ALTO, PR 00977-0046
PO BOX 47, TRUJILLO ALTO, PR 00977-0047
PO BOX 48, TRUJILLO ALTO, PR 00977-0048
PO BOX 49, TRUJILLO ALTO, PR 00977-0049
PO BOX 50, TRUJILLO ALTO, PR 00977-0050
PO BOX 51, TRUJILLO ALTO, PR 00977-0051
PO BOX 52, TRUJILLO ALTO, PR 00977-0052
PO BOX 53, TRUJILLO ALTO, PR 00977-0053
PO BOX 54, TRUJILLO ALTO, PR 00977-0054
PO BOX 55, TRUJILLO ALTO, PR 00977-0055
PO BOX 56, TRUJILLO ALTO, PR 00977-0056
PO BOX 57, TRUJILLO ALTO, PR 00977-0057
PO BOX 58, TRUJILLO ALTO, PR 00977-0058
PO BOX 59, TRUJILLO ALTO, PR 00977-0059
PO BOX 60, TRUJILLO ALTO, PR 00977-0060
PO BOX 61, TRUJILLO ALTO, PR 00977-0061
PO BOX 62, TRUJILLO ALTO, PR 00977-0062
PO BOX 63, TRUJILLO ALTO, PR 00977-0063
PO BOX 64, TRUJILLO ALTO, PR 00977-0064
PO BOX 65, TRUJILLO ALTO, PR 00977-0065
PO BOX 66, TRUJILLO ALTO, PR 00977-0066
PO BOX 67, TRUJILLO ALTO, PR 00977-0067
PO BOX 68, TRUJILLO ALTO, PR 00977-0068
PO BOX 69, TRUJILLO ALTO, PR 00977-0069
PO BOX 70, TRUJILLO ALTO, PR 00977-0070
PO BOX 71, TRUJILLO ALTO, PR 00977-0071
PO BOX 72, TRUJILLO ALTO, PR 00977-0072
PO BOX 73, TRUJILLO ALTO, PR 00977-0073
PO BOX 74, TRUJILLO ALTO, PR 00977-0074
PO BOX 75, TRUJILLO ALTO, PR 00977-0075
PO BOX 76, TRUJILLO ALTO, PR 00977-0076
PO BOX 77, TRUJILLO ALTO, PR 00977-0077
PO BOX 78, TRUJILLO ALTO, PR 00977-0078
PO BOX 79, TRUJILLO ALTO, PR 00977-0079
PO BOX 80, TRUJILLO ALTO, PR 00977-0080
PO BOX 81, TRUJILLO ALTO, PR 00977-0081
PO BOX 82, TRUJILLO ALTO, PR 00977-0082
PO BOX 83, TRUJILLO ALTO, PR 00977-0083
PO BOX 84, TRUJILLO ALTO, PR 00977-0084
PO BOX 85, TRUJILLO ALTO, PR 00977-0085
PO BOX 86, TRUJILLO ALTO, PR 00977-0086
PO BOX 87, TRUJILLO ALTO, PR 00977-0087
PO BOX 88, TRUJILLO ALTO, PR 00977-0088
PO BOX 89, TRUJILLO ALTO, PR 00977-0089
PO BOX 90, TRUJILLO ALTO, PR 00977-0090
PO BOX 91, TRUJILLO ALTO, PR 00977-0091
PO BOX 92, TRUJILLO ALTO, PR 00977-0092
PO BOX 93, TRUJILLO ALTO, PR 00977-0093
PO BOX 94, TRUJILLO ALTO, PR 00977-0094
PO BOX 95, TRUJILLO ALTO, PR 00977-0095
PO BOX 96, TRUJILLO ALTO, PR 00977-0096
PO BOX 97, TRUJILLO ALTO, PR 00977-0097
PO BOX 98, TRUJILLO ALTO, PR 00977-0098
PO BOX 99, TRUJILLO ALTO, PR 00977-0099
PO BOX 100, TRUJILLO ALTO, PR 00977-0100
PO BOX 101, TRUJILLO ALTO, PR 00977-0101
PO BOX 102, TRUJILLO ALTO, PR 00977-0102
PO BOX 103, TRUJILLO ALTO, PR 00977-0103
PO BOX 104, TRUJILLO ALTO, PR 00977-0104
PO BOX 105, TRUJILLO ALTO, PR 00977-0105
PO BOX 106, TRUJILLO ALTO, PR 00977-0106
PO BOX 107, TRUJILLO ALTO, PR 00977-0107
PO BOX 108, TRUJILLO ALTO, PR 00977-0108
PO BOX 109, TRUJILLO ALTO, PR 00977-0109
PO BOX 110, TRUJILLO ALTO, PR 00977-0110
PO BOX 111, TRUJILLO ALTO, PR 00977-0111
PO BOX 112, TRUJILLO ALTO, PR 00977-0112
PO BOX 113, TRUJILLO ALTO, PR 00977-0113
PO BOX 114, TRUJILLO ALTO, PR 00977-0114
PO BOX 115, TRUJILLO ALTO, PR 00977-0115
PO BOX 116, TRUJILLO ALTO, PR 00977-0116
PO BOX 117, TRUJILLO ALTO, PR 00977-0117
PO BOX 118, TRUJILLO ALTO, PR 00977-0118
PO BOX 119, TRUJILLO ALTO, PR 00977-0119
PO BOX 120, TRUJILLO ALTO, PR 00977-0120
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