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, JACKSONVILLE, NY 14854-0001
PO BOX 2, JACKSONVILLE, NY 14854-0002
PO BOX 3, JACKSONVILLE, NY 14854-0003
PO BOX 4, JACKSONVILLE, NY 14854-0004
PO BOX 5, JACKSONVILLE, NY 14854-0005
PO BOX 6, JACKSONVILLE, NY 14854-0006
PO BOX 7, JACKSONVILLE, NY 14854-0007
PO BOX 8, JACKSONVILLE, NY 14854-0008
PO BOX 9, JACKSONVILLE, NY 14854-0009
PO BOX 10, JACKSONVILLE, NY 14854-0010
PO BOX 11, JACKSONVILLE, NY 14854-0011
PO BOX 12, JACKSONVILLE, NY 14854-0012
PO BOX 13, JACKSONVILLE, NY 14854-0013
PO BOX 14, JACKSONVILLE, NY 14854-0014
PO BOX 15, JACKSONVILLE, NY 14854-0015
PO BOX 16, JACKSONVILLE, NY 14854-0016
PO BOX 17, JACKSONVILLE, NY 14854-0017
PO BOX 18, JACKSONVILLE, NY 14854-0018
PO BOX 19, JACKSONVILLE, NY 14854-0019
PO BOX 20, JACKSONVILLE, NY 14854-0020
PO BOX 21, JACKSONVILLE, NY 14854-0021
PO BOX 22, JACKSONVILLE, NY 14854-0022
PO BOX 23, JACKSONVILLE, NY 14854-0023
PO BOX 24, JACKSONVILLE, NY 14854-0024
PO BOX 25, JACKSONVILLE, NY 14854-0025
PO BOX 26, JACKSONVILLE, NY 14854-0026
PO BOX 27, JACKSONVILLE, NY 14854-0027
PO BOX 28, JACKSONVILLE, NY 14854-0028
PO BOX 29, JACKSONVILLE, NY 14854-0029
PO BOX 30, JACKSONVILLE, NY 14854-0030
PO BOX 31, JACKSONVILLE, NY 14854-0031
PO BOX 32, JACKSONVILLE, NY 14854-0032
PO BOX 33, JACKSONVILLE, NY 14854-0033
PO BOX 34, JACKSONVILLE, NY 14854-0034
PO BOX 35, JACKSONVILLE, NY 14854-0035
PO BOX 36, JACKSONVILLE, NY 14854-0036
PO BOX 37, JACKSONVILLE, NY 14854-0037
PO BOX 38, JACKSONVILLE, NY 14854-0038
PO BOX 39, JACKSONVILLE, NY 14854-0039
PO BOX 40, JACKSONVILLE, NY 14854-0040
PO BOX 41, JACKSONVILLE, NY 14854-0041
PO BOX 42, JACKSONVILLE, NY 14854-0042
PO BOX 43, JACKSONVILLE, NY 14854-0043
PO BOX 44, JACKSONVILLE, NY 14854-0044
PO BOX 45, JACKSONVILLE, NY 14854-0045
PO BOX 46, JACKSONVILLE, NY 14854-0046
PO BOX 47, JACKSONVILLE, NY 14854-0047
PO BOX 48, JACKSONVILLE, NY 14854-0048
PO BOX 49, JACKSONVILLE, NY 14854-0049
PO BOX 50, JACKSONVILLE, NY 14854-0050
PO BOX 51, JACKSONVILLE, NY 14854-0051
PO BOX 52, JACKSONVILLE, NY 14854-0052
PO BOX 53, JACKSONVILLE, NY 14854-0053
PO BOX 54, JACKSONVILLE, NY 14854-0054
PO BOX 55, JACKSONVILLE, NY 14854-0055
PO BOX 56, JACKSONVILLE, NY 14854-0056
PO BOX 57, JACKSONVILLE, NY 14854-0057
PO BOX 58, JACKSONVILLE, NY 14854-0058
PO BOX 59, JACKSONVILLE, NY 14854-0059
PO BOX 60, JACKSONVILLE, NY 14854-0060
PO BOX 61, JACKSONVILLE, NY 14854-0061
PO BOX 62, JACKSONVILLE, NY 14854-0062
PO BOX 63, JACKSONVILLE, NY 14854-0063
PO BOX 64, JACKSONVILLE, NY 14854-0064
PO BOX 65, JACKSONVILLE, NY 14854-0065
PO BOX 66, JACKSONVILLE, NY 14854-0066
PO BOX 67, JACKSONVILLE, NY 14854-0067
PO BOX 68, JACKSONVILLE, NY 14854-0068
PO BOX 69, JACKSONVILLE, NY 14854-0069
PO BOX 70, JACKSONVILLE, NY 14854-0070
PO BOX 71, JACKSONVILLE, NY 14854-0071
PO BOX 72, JACKSONVILLE, NY 14854-0072
PO BOX 73, JACKSONVILLE, NY 14854-0073
PO BOX 74, JACKSONVILLE, NY 14854-0074
PO BOX 75, JACKSONVILLE, NY 14854-0075
PO BOX 76, JACKSONVILLE, NY 14854-0076
PO BOX 77, JACKSONVILLE, NY 14854-0077
PO BOX 78, JACKSONVILLE, NY 14854-0078
PO BOX 79, JACKSONVILLE, NY 14854-0079
PO BOX 80, JACKSONVILLE, NY 14854-0080
PO BOX 81, JACKSONVILLE, NY 14854-0081
PO BOX 82, JACKSONVILLE, NY 14854-0082
PO BOX 83, JACKSONVILLE, NY 14854-0083
PO BOX 84, JACKSONVILLE, NY 14854-0084
PO BOX 85, JACKSONVILLE, NY 14854-0085
PO BOX 86, JACKSONVILLE, NY 14854-0086
PO BOX 87, JACKSONVILLE, NY 14854-0087
PO BOX 88, JACKSONVILLE, NY 14854-0088
PO BOX 89, JACKSONVILLE, NY 14854-0089
PO BOX 90, JACKSONVILLE, NY 14854-0090
PO BOX 91, JACKSONVILLE, NY 14854-0091
PO BOX 92, JACKSONVILLE, NY 14854-0092
PO BOX 93, JACKSONVILLE, NY 14854-0093
PO BOX 94, JACKSONVILLE, NY 14854-0094
PO BOX 95, JACKSONVILLE, NY 14854-0095
PO BOX 96, JACKSONVILLE, NY 14854-0096
PO BOX 97, JACKSONVILLE, NY 14854-0097
PO BOX 98, JACKSONVILLE, NY 14854-0098
PO BOX 99, JACKSONVILLE, NY 14854-0099
PO BOX 100, JACKSONVILLE, NY 14854-0100
PO BOX 101, JACKSONVILLE, NY 14854-0101
PO BOX 102, JACKSONVILLE, NY 14854-0102
PO BOX 103, JACKSONVILLE, NY 14854-0103
PO BOX 104, JACKSONVILLE, NY 14854-0104
PO BOX 105, JACKSONVILLE, NY 14854-0105
PO BOX 106, JACKSONVILLE, NY 14854-0106
PO BOX 107, JACKSONVILLE, NY 14854-0107
PO BOX 108, JACKSONVILLE, NY 14854-0108
PO BOX 109, JACKSONVILLE, NY 14854-0109
PO BOX 110, JACKSONVILLE, NY 14854-0110
PO BOX 111, JACKSONVILLE, NY 14854-0111
PO BOX 112, JACKSONVILLE, NY 14854-0112
PO BOX 113, JACKSONVILLE, NY 14854-0113
PO BOX 114, JACKSONVILLE, NY 14854-0114
PO BOX 115, JACKSONVILLE, NY 14854-0115
PO BOX 116, JACKSONVILLE, NY 14854-0116
PO BOX 117, JACKSONVILLE, NY 14854-0117
PO BOX 118, JACKSONVILLE, NY 14854-0118
PO BOX 119, JACKSONVILLE, NY 14854-0119
PO BOX 120, JACKSONVILLE, NY 14854-0120
PO BOX 121, JACKSONVILLE, NY 14854-0121
PO BOX 122, JACKSONVILLE, NY 14854-0122
PO BOX 123, JACKSONVILLE, NY 14854-0123
PO BOX 124, JACKSONVILLE, NY 14854-0124
PO BOX 125, JACKSONVILLE, NY 14854-0125
PO BOX 126, JACKSONVILLE, NY 14854-0126
PO BOX 127, JACKSONVILLE, NY 14854-0127
PO BOX 128, JACKSONVILLE, NY 14854-0128
PO BOX 129, JACKSONVILLE, NY 14854-0129
PO BOX 130, JACKSONVILLE, NY 14854-0130
PO BOX 131, JACKSONVILLE, NY 14854-0131
PO BOX 132, JACKSONVILLE, NY 14854-0132
PO BOX 133, JACKSONVILLE, NY 14854-0133
PO BOX 134, JACKSONVILLE, NY 14854-0134
PO BOX 135, JACKSONVILLE, NY 14854-0135
PO BOX 136, JACKSONVILLE, NY 14854-0136
PO BOX 137, JACKSONVILLE, NY 14854-0137
PO BOX 138, JACKSONVILLE, NY 14854-0138
PO BOX 139, JACKSONVILLE, NY 14854-0139
PO BOX 140, JACKSONVILLE, NY 14854-0140
PO BOX 141, JACKSONVILLE, NY 14854-0141
PO BOX 142, JACKSONVILLE, NY 14854-0142
PO BOX 143, JACKSONVILLE, NY 14854-0143
PO BOX 144, JACKSONVILLE, NY 14854-0144
PO BOX 145, JACKSONVILLE, NY 14854-0145
PO BOX 146, JACKSONVILLE, NY 14854-0146
PO BOX 147, JACKSONVILLE, NY 14854-0147
PO BOX 148, JACKSONVILLE, NY 14854-0148
PO BOX 149, JACKSONVILLE, NY 14854-0149
PO BOX 150, JACKSONVILLE, NY 14854-0150
PO BOX 151, JACKSONVILLE, NY 14854-0151
PO BOX 152, JACKSONVILLE, NY 14854-0152
PO BOX 153, JACKSONVILLE, NY 14854-0153
PO BOX 154, JACKSONVILLE, NY 14854-0154
PO BOX 155, JACKSONVILLE, NY 14854-0155
PO BOX 156, JACKSONVILLE, NY 14854-0156
PO BOX 157, JACKSONVILLE, NY 14854-0157
PO BOX 158, JACKSONVILLE, NY 14854-0158
PO BOX 159, JACKSONVILLE, NY 14854-0159
PO BOX 160, JACKSONVILLE, NY 14854-0160
PO BOX 161, JACKSONVILLE, NY 14854-0161
PO BOX 162, JACKSONVILLE, NY 14854-0162
PO BOX 163, JACKSONVILLE, NY 14854-0163
PO BOX 164, JACKSONVILLE, NY 14854-0164
PO BOX 165, JACKSONVILLE, NY 14854-0165
PO BOX 166, JACKSONVILLE, NY 14854-0166
PO BOX 167, JACKSONVILLE, NY 14854-0167
PO BOX 168, JACKSONVILLE, NY 14854-0168
PO BOX 169, JACKSONVILLE, NY 14854-0169
PO BOX 170, JACKSONVILLE, NY 14854-0170
PO BOX 171, JACKSONVILLE, NY 14854-0171
PO BOX 172, JACKSONVILLE, NY 14854-0172
PO BOX 173, JACKSONVILLE, NY 14854-0173
PO BOX 174, JACKSONVILLE, NY 14854-0174
PO BOX 175, JACKSONVILLE, NY 14854-0175
PO BOX 176, JACKSONVILLE, NY 14854-0176
PO BOX 177, JACKSONVILLE, NY 14854-0177
PO BOX 178, JACKSONVILLE, NY 14854-0178
PO BOX 179, JACKSONVILLE, NY 14854-0179
PO BOX 180, JACKSONVILLE, NY 14854-0180
PO BOX 181, JACKSONVILLE, NY 14854-0181
PO BOX 182, JACKSONVILLE, NY 14854-0182
PO BOX 183, JACKSONVILLE, NY 14854-0183
PO BOX 184, JACKSONVILLE, NY 14854-0184
PO BOX 185, JACKSONVILLE, NY 14854-0185
PO BOX 186, JACKSONVILLE, NY 14854-0186
PO BOX 187, JACKSONVILLE, NY 14854-0187
PO BOX 188, JACKSONVILLE, NY 14854-0188
PO BOX 189, JACKSONVILLE, NY 14854-0189
PO BOX 190, JACKSONVILLE, NY 14854-0190
PO BOX 191, JACKSONVILLE, NY 14854-0191
PO BOX 192, JACKSONVILLE, NY 14854-0192
PO BOX 193, JACKSONVILLE, NY 14854-0193
PO BOX 194, JACKSONVILLE, NY 14854-0194
PO BOX 195, JACKSONVILLE, NY 14854-0195
PO BOX 196, JACKSONVILLE, NY 14854-0196
PO BOX 197, JACKSONVILLE, NY 14854-0197
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