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 121, GLENWOOD SPRINGS, CO 81602-0121
PO BOX 122, GLENWOOD SPRINGS, CO 81602-0122
PO BOX 123, GLENWOOD SPRINGS, CO 81602-0123
PO BOX 124, GLENWOOD SPRINGS, CO 81602-0124
PO BOX 125, GLENWOOD SPRINGS, CO 81602-0125
PO BOX 126, GLENWOOD SPRINGS, CO 81602-0126
PO BOX 127, GLENWOOD SPRINGS, CO 81602-0127
PO BOX 128, GLENWOOD SPRINGS, CO 81602-0128
PO BOX 129, GLENWOOD SPRINGS, CO 81602-0129
PO BOX 130, GLENWOOD SPRINGS, CO 81602-0130
PO BOX 131, GLENWOOD SPRINGS, CO 81602-0131
PO BOX 132, GLENWOOD SPRINGS, CO 81602-0132
PO BOX 133, GLENWOOD SPRINGS, CO 81602-0133
PO BOX 134, GLENWOOD SPRINGS, CO 81602-0134
PO BOX 135, GLENWOOD SPRINGS, CO 81602-0135
PO BOX 136, GLENWOOD SPRINGS, CO 81602-0136
PO BOX 137, GLENWOOD SPRINGS, CO 81602-0137
PO BOX 138, GLENWOOD SPRINGS, CO 81602-0138
PO BOX 139, GLENWOOD SPRINGS, CO 81602-0139
PO BOX 140, GLENWOOD SPRINGS, CO 81602-0140
PO BOX 141, GLENWOOD SPRINGS, CO 81602-0141
PO BOX 142, GLENWOOD SPRINGS, CO 81602-0142
PO BOX 143, GLENWOOD SPRINGS, CO 81602-0143
PO BOX 144, GLENWOOD SPRINGS, CO 81602-0144
PO BOX 145, GLENWOOD SPRINGS, CO 81602-0145
PO BOX 146, GLENWOOD SPRINGS, CO 81602-0146
PO BOX 147, GLENWOOD SPRINGS, CO 81602-0147
PO BOX 148, GLENWOOD SPRINGS, CO 81602-0148
PO BOX 149, GLENWOOD SPRINGS, CO 81602-0149
PO BOX 150, GLENWOOD SPRINGS, CO 81602-0150
PO BOX 151, GLENWOOD SPRINGS, CO 81602-0151
PO BOX 152, GLENWOOD SPRINGS, CO 81602-0152
PO BOX 153, GLENWOOD SPRINGS, CO 81602-0153
PO BOX 154, GLENWOOD SPRINGS, CO 81602-0154
PO BOX 155, GLENWOOD SPRINGS, CO 81602-0155
PO BOX 156, GLENWOOD SPRINGS, CO 81602-0156
PO BOX 157, GLENWOOD SPRINGS, CO 81602-0157
PO BOX 158, GLENWOOD SPRINGS, CO 81602-0158
PO BOX 159, GLENWOOD SPRINGS, CO 81602-0159
PO BOX 160, GLENWOOD SPRINGS, CO 81602-0160
PO BOX 161, GLENWOOD SPRINGS, CO 81602-0161
PO BOX 162, GLENWOOD SPRINGS, CO 81602-0162
PO BOX 163, GLENWOOD SPRINGS, CO 81602-0163
PO BOX 164, GLENWOOD SPRINGS, CO 81602-0164
PO BOX 165, GLENWOOD SPRINGS, CO 81602-0165
PO BOX 166, GLENWOOD SPRINGS, CO 81602-0166
PO BOX 167, GLENWOOD SPRINGS, CO 81602-0167
PO BOX 168, GLENWOOD SPRINGS, CO 81602-0168
PO BOX 169, GLENWOOD SPRINGS, CO 81602-0169
PO BOX 170, GLENWOOD SPRINGS, CO 81602-0170
PO BOX 171, GLENWOOD SPRINGS, CO 81602-0171
PO BOX 172, GLENWOOD SPRINGS, CO 81602-0172
PO BOX 173, GLENWOOD SPRINGS, CO 81602-0173
PO BOX 174, GLENWOOD SPRINGS, CO 81602-0174
PO BOX 175, GLENWOOD SPRINGS, CO 81602-0175
PO BOX 176, GLENWOOD SPRINGS, CO 81602-0176
PO BOX 177, GLENWOOD SPRINGS, CO 81602-0177
PO BOX 178, GLENWOOD SPRINGS, CO 81602-0178
PO BOX 179, GLENWOOD SPRINGS, CO 81602-0179
PO BOX 180, GLENWOOD SPRINGS, CO 81602-0180
PO BOX 181, GLENWOOD SPRINGS, CO 81602-0181
PO BOX 182, GLENWOOD SPRINGS, CO 81602-0182
PO BOX 183, GLENWOOD SPRINGS, CO 81602-0183
PO BOX 184, GLENWOOD SPRINGS, CO 81602-0184
PO BOX 185, GLENWOOD SPRINGS, CO 81602-0185
PO BOX 186, GLENWOOD SPRINGS, CO 81602-0186
PO BOX 187, GLENWOOD SPRINGS, CO 81602-0187
PO BOX 188, GLENWOOD SPRINGS, CO 81602-0188
PO BOX 189, GLENWOOD SPRINGS, CO 81602-0189
PO BOX 190, GLENWOOD SPRINGS, CO 81602-0190
PO BOX 191, GLENWOOD SPRINGS, CO 81602-0191
PO BOX 192, GLENWOOD SPRINGS, CO 81602-0192
PO BOX 193, GLENWOOD SPRINGS, CO 81602-0193
PO BOX 194, GLENWOOD SPRINGS, CO 81602-0194
PO BOX 195, GLENWOOD SPRINGS, CO 81602-0195
PO BOX 196, GLENWOOD SPRINGS, CO 81602-0196
PO BOX 197, GLENWOOD SPRINGS, CO 81602-0197
PO BOX 198, GLENWOOD SPRINGS, CO 81602-0198
PO BOX 199, GLENWOOD SPRINGS, CO 81602-0199
PO BOX 200, GLENWOOD SPRINGS, CO 81602-0200
PO BOX 201, GLENWOOD SPRINGS, CO 81602-0201
PO BOX 202, GLENWOOD SPRINGS, CO 81602-0202
PO BOX 203, GLENWOOD SPRINGS, CO 81602-0203
PO BOX 204, GLENWOOD SPRINGS, CO 81602-0204
PO BOX 205, GLENWOOD SPRINGS, CO 81602-0205
PO BOX 206, GLENWOOD SPRINGS, CO 81602-0206
PO BOX 207, GLENWOOD SPRINGS, CO 81602-0207
PO BOX 208, GLENWOOD SPRINGS, CO 81602-0208
PO BOX 209, GLENWOOD SPRINGS, CO 81602-0209
PO BOX 210, GLENWOOD SPRINGS, CO 81602-0210
PO BOX 211, GLENWOOD SPRINGS, CO 81602-0211
PO BOX 212, GLENWOOD SPRINGS, CO 81602-0212
PO BOX 213, GLENWOOD SPRINGS, CO 81602-0213
PO BOX 214, GLENWOOD SPRINGS, CO 81602-0214
PO BOX 215, GLENWOOD SPRINGS, CO 81602-0215
PO BOX 216, GLENWOOD SPRINGS, CO 81602-0216
PO BOX 217, GLENWOOD SPRINGS, CO 81602-0217
PO BOX 218, GLENWOOD SPRINGS, CO 81602-0218
PO BOX 219, GLENWOOD SPRINGS, CO 81602-0219
PO BOX 220, GLENWOOD SPRINGS, CO 81602-0220
PO BOX 221, GLENWOOD SPRINGS, CO 81602-0221
PO BOX 222, GLENWOOD SPRINGS, CO 81602-0222
PO BOX 223, GLENWOOD SPRINGS, CO 81602-0223
PO BOX 224, GLENWOOD SPRINGS, CO 81602-0224
PO BOX 225, GLENWOOD SPRINGS, CO 81602-0225
PO BOX 226, GLENWOOD SPRINGS, CO 81602-0226
PO BOX 227, GLENWOOD SPRINGS, CO 81602-0227
PO BOX 228, GLENWOOD SPRINGS, CO 81602-0228
PO BOX 229, GLENWOOD SPRINGS, CO 81602-0229
PO BOX 230, GLENWOOD SPRINGS, CO 81602-0230
PO BOX 231, GLENWOOD SPRINGS, CO 81602-0231
PO BOX 232, GLENWOOD SPRINGS, CO 81602-0232
PO BOX 233, GLENWOOD SPRINGS, CO 81602-0233
PO BOX 234, GLENWOOD SPRINGS, CO 81602-0234
PO BOX 235, GLENWOOD SPRINGS, CO 81602-0235
PO BOX 236, GLENWOOD SPRINGS, CO 81602-0236
PO BOX 237, GLENWOOD SPRINGS, CO 81602-0237
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