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 21, NEW YORK, NY 10163-0021
PO BOX 22, NEW YORK, NY 10163-0022
PO BOX 23, NEW YORK, NY 10163-0023
PO BOX 24, NEW YORK, NY 10163-0024
PO BOX 25, NEW YORK, NY 10163-0025
PO BOX 26, NEW YORK, NY 10163-0026
PO BOX 27, NEW YORK, NY 10163-0027
PO BOX 28, NEW YORK, NY 10163-0028
PO BOX 29, NEW YORK, NY 10163-0029
PO BOX 30, NEW YORK, NY 10163-0030
PO BOX 31, NEW YORK, NY 10163-0031
PO BOX 32, NEW YORK, NY 10163-0032
PO BOX 33, NEW YORK, NY 10163-0033
PO BOX 34, NEW YORK, NY 10163-0034
PO BOX 35, NEW YORK, NY 10163-0035
PO BOX 36, NEW YORK, NY 10163-0036
PO BOX 37, NEW YORK, NY 10163-0037
PO BOX 38, NEW YORK, NY 10163-0038
PO BOX 39, NEW YORK, NY 10163-0039
PO BOX 40, NEW YORK, NY 10163-0040
PO BOX 41, NEW YORK, NY 10163-0041
PO BOX 42, NEW YORK, NY 10163-0042
PO BOX 43, NEW YORK, NY 10163-0043
PO BOX 44, NEW YORK, NY 10163-0044
PO BOX 45, NEW YORK, NY 10163-0045
PO BOX 46, NEW YORK, NY 10163-0046
PO BOX 47, NEW YORK, NY 10163-0047
PO BOX 48, NEW YORK, NY 10163-0048
PO BOX 49, NEW YORK, NY 10163-0049
PO BOX 50, NEW YORK, NY 10163-0050
PO BOX 51, NEW YORK, NY 10163-0051
PO BOX 52, NEW YORK, NY 10163-0052
PO BOX 53, NEW YORK, NY 10163-0053
PO BOX 54, NEW YORK, NY 10163-0054
PO BOX 55, NEW YORK, NY 10163-0055
PO BOX 56, NEW YORK, NY 10163-0056
PO BOX 57, NEW YORK, NY 10163-0057
PO BOX 58, NEW YORK, NY 10163-0058
PO BOX 59, NEW YORK, NY 10163-0059
PO BOX 60, NEW YORK, NY 10163-0060
PO BOX 61, NEW YORK, NY 10163-0061
PO BOX 62, NEW YORK, NY 10163-0062
PO BOX 63, NEW YORK, NY 10163-0063
PO BOX 64, NEW YORK, NY 10163-0064
PO BOX 65, NEW YORK, NY 10163-0065
PO BOX 66, NEW YORK, NY 10163-0066
PO BOX 67, NEW YORK, NY 10163-0067
PO BOX 68, NEW YORK, NY 10163-0068
PO BOX 69, NEW YORK, NY 10163-0069
PO BOX 70, NEW YORK, NY 10163-0070
PO BOX 71, NEW YORK, NY 10163-0071
PO BOX 72, NEW YORK, NY 10163-0072
PO BOX 73, NEW YORK, NY 10163-0073
PO BOX 74, NEW YORK, NY 10163-0074
PO BOX 75, NEW YORK, NY 10163-0075
PO BOX 76, NEW YORK, NY 10163-0076
PO BOX 77, NEW YORK, NY 10163-0077
PO BOX 78, NEW YORK, NY 10163-0078
PO BOX 79, NEW YORK, NY 10163-0079
PO BOX 80, NEW YORK, NY 10163-0080
PO BOX 81, NEW YORK, NY 10163-0081
PO BOX 82, NEW YORK, NY 10163-0082
PO BOX 83, NEW YORK, NY 10163-0083
PO BOX 84, NEW YORK, NY 10163-0084
PO BOX 85, NEW YORK, NY 10163-0085
PO BOX 86, NEW YORK, NY 10163-0086
PO BOX 87, NEW YORK, NY 10163-0087
PO BOX 88, NEW YORK, NY 10163-0088
PO BOX 89, NEW YORK, NY 10163-0089
PO BOX 90, NEW YORK, NY 10163-0090
PO BOX 91, NEW YORK, NY 10163-0091
PO BOX 92, NEW YORK, NY 10163-0092
PO BOX 93, NEW YORK, NY 10163-0093
PO BOX 94, NEW YORK, NY 10163-0094
PO BOX 95, NEW YORK, NY 10163-0095
PO BOX 96, NEW YORK, NY 10163-0096
PO BOX 97, NEW YORK, NY 10163-0097
PO BOX 98, NEW YORK, NY 10163-0098
PO BOX 99, NEW YORK, NY 10163-0099
PO BOX 100, NEW YORK, NY 10163-0100
PO BOX 101, NEW YORK, NY 10163-0101
PO BOX 102, NEW YORK, NY 10163-0102
PO BOX 103, NEW YORK, NY 10163-0103
PO BOX 104, NEW YORK, NY 10163-0104
PO BOX 105, NEW YORK, NY 10163-0105
PO BOX 106, NEW YORK, NY 10163-0106
PO BOX 107, NEW YORK, NY 10163-0107
PO BOX 108, NEW YORK, NY 10163-0108
PO BOX 109, NEW YORK, NY 10163-0109
PO BOX 110, NEW YORK, NY 10163-0110
PO BOX 111, NEW YORK, NY 10163-0111
PO BOX 112, NEW YORK, NY 10163-0112
PO BOX 113, NEW YORK, NY 10163-0113
PO BOX 114, NEW YORK, NY 10163-0114
PO BOX 115, NEW YORK, NY 10163-0115
PO BOX 116, NEW YORK, NY 10163-0116
PO BOX 117, NEW YORK, NY 10163-0117
PO BOX 118, NEW YORK, NY 10163-0118
PO BOX 119, NEW YORK, NY 10163-0119
PO BOX 120, NEW YORK, NY 10163-0120
PO BOX 121, NEW YORK, NY 10163-0121
PO BOX 122, NEW YORK, NY 10163-0122
PO BOX 123, NEW YORK, NY 10163-0123
PO BOX 124, NEW YORK, NY 10163-0124
PO BOX 125, NEW YORK, NY 10163-0125
PO BOX 126, NEW YORK, NY 10163-0126
PO BOX 127, NEW YORK, NY 10163-0127
PO BOX 128, NEW YORK, NY 10163-0128
PO BOX 129, NEW YORK, NY 10163-0129
PO BOX 130, NEW YORK, NY 10163-0130
PO BOX 131, NEW YORK, NY 10163-0131
PO BOX 132, NEW YORK, NY 10163-0132
PO BOX 133, NEW YORK, NY 10163-0133
PO BOX 134, NEW YORK, NY 10163-0134
PO BOX 135, NEW YORK, NY 10163-0135
PO BOX 136, NEW YORK, NY 10163-0136
PO BOX 137, NEW YORK, NY 10163-0137
PO BOX 138, NEW YORK, NY 10163-0138
PO BOX 139, NEW YORK, NY 10163-0139
PO BOX 140, NEW YORK, NY 10163-0140
PO BOX 141, NEW YORK, NY 10163-0141
PO BOX 142, NEW YORK, NY 10163-0142
PO BOX 143, NEW YORK, NY 10163-0143
PO BOX 144, NEW YORK, NY 10163-0144
PO BOX 145, NEW YORK, NY 10163-0145
PO BOX 146, NEW YORK, NY 10163-0146
PO BOX 147, NEW YORK, NY 10163-0147
PO BOX 148, NEW YORK, NY 10163-0148
PO BOX 149, NEW YORK, NY 10163-0149
PO BOX 150, NEW YORK, NY 10163-0150
PO BOX 151, NEW YORK, NY 10163-0151
PO BOX 152, NEW YORK, NY 10163-0152
PO BOX 153, NEW YORK, NY 10163-0153
PO BOX 154, NEW YORK, NY 10163-0154
PO BOX 155, NEW YORK, NY 10163-0155
PO BOX 156, NEW YORK, NY 10163-0156
PO BOX 157, NEW YORK, NY 10163-0157
PO BOX 158, NEW YORK, NY 10163-0158
PO BOX 159, NEW YORK, NY 10163-0159
PO BOX 160, NEW YORK, NY 10163-0160
PO BOX 161, NEW YORK, NY 10163-0161
PO BOX 162, NEW YORK, NY 10163-0162
PO BOX 163, NEW YORK, NY 10163-0163
PO BOX 164, NEW YORK, NY 10163-0164
PO BOX 165, NEW YORK, NY 10163-0165
PO BOX 166, NEW YORK, NY 10163-0166
PO BOX 167, NEW YORK, NY 10163-0167
PO BOX 168, NEW YORK, NY 10163-0168
PO BOX 169, NEW YORK, NY 10163-0169
PO BOX 170, NEW YORK, NY 10163-0170
PO BOX 171, NEW YORK, NY 10163-0171
PO BOX 172, NEW YORK, NY 10163-0172
PO BOX 173, NEW YORK, NY 10163-0173
PO BOX 174, NEW YORK, NY 10163-0174
PO BOX 175, NEW YORK, NY 10163-0175
PO BOX 176, NEW YORK, NY 10163-0176
PO BOX 177, NEW YORK, NY 10163-0177
PO BOX 178, NEW YORK, NY 10163-0178
PO BOX 179, NEW YORK, NY 10163-0179
PO BOX 180, NEW YORK, NY 10163-0180
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