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 91, COLORADO SPRINGS, CO 80901-0091
PO BOX 92, COLORADO SPRINGS, CO 80901-0092
PO BOX 93, COLORADO SPRINGS, CO 80901-0093
PO BOX 94, COLORADO SPRINGS, CO 80901-0094
PO BOX 95, COLORADO SPRINGS, CO 80901-0095
PO BOX 96, COLORADO SPRINGS, CO 80901-0096
PO BOX 97, COLORADO SPRINGS, CO 80901-0097
PO BOX 98, COLORADO SPRINGS, CO 80901-0098
PO BOX 99, COLORADO SPRINGS, CO 80901-0099
PO BOX 100, COLORADO SPRINGS, CO 80901-0100
PO BOX 101, COLORADO SPRINGS, CO 80901-0101
PO BOX 102, COLORADO SPRINGS, CO 80901-0102
PO BOX 103, COLORADO SPRINGS, CO 80901-0103
PO BOX 104, COLORADO SPRINGS, CO 80901-0104
PO BOX 105, COLORADO SPRINGS, CO 80901-0105
PO BOX 106, COLORADO SPRINGS, CO 80901-0106
PO BOX 107, COLORADO SPRINGS, CO 80901-0107
PO BOX 108, COLORADO SPRINGS, CO 80901-0108
PO BOX 109, COLORADO SPRINGS, CO 80901-0109
PO BOX 110, COLORADO SPRINGS, CO 80901-0110
PO BOX 111, COLORADO SPRINGS, CO 80901-0111
PO BOX 112, COLORADO SPRINGS, CO 80901-0112
PO BOX 113, COLORADO SPRINGS, CO 80901-0113
PO BOX 114, COLORADO SPRINGS, CO 80901-0114
PO BOX 115, COLORADO SPRINGS, CO 80901-0115
PO BOX 116, COLORADO SPRINGS, CO 80901-0116
PO BOX 117, COLORADO SPRINGS, CO 80901-0117
PO BOX 118, COLORADO SPRINGS, CO 80901-0118
PO BOX 119, COLORADO SPRINGS, CO 80901-0119
PO BOX 120, COLORADO SPRINGS, CO 80901-0120
PO BOX 121, COLORADO SPRINGS, CO 80901-0121
PO BOX 122, COLORADO SPRINGS, CO 80901-0122
PO BOX 123, COLORADO SPRINGS, CO 80901-0123
PO BOX 124, COLORADO SPRINGS, CO 80901-0124
PO BOX 125, COLORADO SPRINGS, CO 80901-0125
PO BOX 126, COLORADO SPRINGS, CO 80901-0126
PO BOX 127, COLORADO SPRINGS, CO 80901-0127
PO BOX 128, COLORADO SPRINGS, CO 80901-0128
PO BOX 129, COLORADO SPRINGS, CO 80901-0129
PO BOX 130, COLORADO SPRINGS, CO 80901-0130
PO BOX 131, COLORADO SPRINGS, CO 80901-0131
PO BOX 132, COLORADO SPRINGS, CO 80901-0132
PO BOX 133, COLORADO SPRINGS, CO 80901-0133
PO BOX 134, COLORADO SPRINGS, CO 80901-0134
PO BOX 135, COLORADO SPRINGS, CO 80901-0135
PO BOX 136, COLORADO SPRINGS, CO 80901-0136
PO BOX 137, COLORADO SPRINGS, CO 80901-0137
PO BOX 138, COLORADO SPRINGS, CO 80901-0138
PO BOX 139, COLORADO SPRINGS, CO 80901-0139
PO BOX 140, COLORADO SPRINGS, CO 80901-0140
PO BOX 141, COLORADO SPRINGS, CO 80901-0141
PO BOX 142, COLORADO SPRINGS, CO 80901-0142
PO BOX 143, COLORADO SPRINGS, CO 80901-0143
PO BOX 144, COLORADO SPRINGS, CO 80901-0144
PO BOX 145, COLORADO SPRINGS, CO 80901-0145
PO BOX 146, COLORADO SPRINGS, CO 80901-0146
PO BOX 147, COLORADO SPRINGS, CO 80901-0147
PO BOX 148, COLORADO SPRINGS, CO 80901-0148
PO BOX 149, COLORADO SPRINGS, CO 80901-0149
PO BOX 150, COLORADO SPRINGS, CO 80901-0150
PO BOX 151, COLORADO SPRINGS, CO 80901-0151
PO BOX 152, COLORADO SPRINGS, CO 80901-0152
PO BOX 153, COLORADO SPRINGS, CO 80901-0153
PO BOX 154, COLORADO SPRINGS, CO 80901-0154
PO BOX 155, COLORADO SPRINGS, CO 80901-0155
PO BOX 156, COLORADO SPRINGS, CO 80901-0156
PO BOX 157, COLORADO SPRINGS, CO 80901-0157
PO BOX 158, COLORADO SPRINGS, CO 80901-0158
PO BOX 159, COLORADO SPRINGS, CO 80901-0159
PO BOX 160, COLORADO SPRINGS, CO 80901-0160
PO BOX 161, COLORADO SPRINGS, CO 80901-0161
PO BOX 162, COLORADO SPRINGS, CO 80901-0162
PO BOX 163, COLORADO SPRINGS, CO 80901-0163
PO BOX 164, COLORADO SPRINGS, CO 80901-0164
PO BOX 165, COLORADO SPRINGS, CO 80901-0165
PO BOX 166, COLORADO SPRINGS, CO 80901-0166
PO BOX 167, COLORADO SPRINGS, CO 80901-0167
PO BOX 168, COLORADO SPRINGS, CO 80901-0168
PO BOX 169, COLORADO SPRINGS, CO 80901-0169
PO BOX 170, COLORADO SPRINGS, CO 80901-0170
PO BOX 171, COLORADO SPRINGS, CO 80901-0171
PO BOX 172, COLORADO SPRINGS, CO 80901-0172
PO BOX 173, COLORADO SPRINGS, CO 80901-0173
PO BOX 174, COLORADO SPRINGS, CO 80901-0174
PO BOX 175, COLORADO SPRINGS, CO 80901-0175
PO BOX 176, COLORADO SPRINGS, CO 80901-0176
PO BOX 177, COLORADO SPRINGS, CO 80901-0177
PO BOX 178, COLORADO SPRINGS, CO 80901-0178
PO BOX 179, COLORADO SPRINGS, CO 80901-0179
PO BOX 180, COLORADO SPRINGS, CO 80901-0180
PO BOX 181, COLORADO SPRINGS, CO 80901-0181
PO BOX 182, COLORADO SPRINGS, CO 80901-0182
PO BOX 183, COLORADO SPRINGS, CO 80901-0183
PO BOX 184, COLORADO SPRINGS, CO 80901-0184
PO BOX 185, COLORADO SPRINGS, CO 80901-0185
PO BOX 186, COLORADO SPRINGS, CO 80901-0186
PO BOX 187, COLORADO SPRINGS, CO 80901-0187
PO BOX 188, COLORADO SPRINGS, CO 80901-0188
PO BOX 189, COLORADO SPRINGS, CO 80901-0189
PO BOX 190, COLORADO SPRINGS, CO 80901-0190
PO BOX 191, COLORADO SPRINGS, CO 80901-0191
PO BOX 192, COLORADO SPRINGS, CO 80901-0192
PO BOX 193, COLORADO SPRINGS, CO 80901-0193
PO BOX 194, COLORADO SPRINGS, CO 80901-0194
PO BOX 195, COLORADO SPRINGS, CO 80901-0195
PO BOX 196, COLORADO SPRINGS, CO 80901-0196
PO BOX 197, COLORADO SPRINGS, CO 80901-0197
PO BOX 198, COLORADO SPRINGS, CO 80901-0198
PO BOX 199, COLORADO SPRINGS, CO 80901-0199
PO BOX 200, COLORADO SPRINGS, CO 80901-0200
PO BOX 201, COLORADO SPRINGS, CO 80901-0201
PO BOX 202, COLORADO SPRINGS, CO 80901-0202
PO BOX 203, COLORADO SPRINGS, CO 80901-0203
PO BOX 204, COLORADO SPRINGS, CO 80901-0204
PO BOX 205, COLORADO SPRINGS, CO 80901-0205
PO BOX 206, COLORADO SPRINGS, CO 80901-0206
PO BOX 207, COLORADO SPRINGS, CO 80901-0207
PO BOX 208, COLORADO SPRINGS, CO 80901-0208
PO BOX 209, COLORADO SPRINGS, CO 80901-0209
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