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, WEST PALM BEACH, FL 33402-0121
PO BOX 122, WEST PALM BEACH, FL 33402-0122
PO BOX 123, WEST PALM BEACH, FL 33402-0123
PO BOX 124, WEST PALM BEACH, FL 33402-0124
PO BOX 125, WEST PALM BEACH, FL 33402-0125
PO BOX 126, WEST PALM BEACH, FL 33402-0126
PO BOX 127, WEST PALM BEACH, FL 33402-0127
PO BOX 128, WEST PALM BEACH, FL 33402-0128
PO BOX 129, WEST PALM BEACH, FL 33402-0129
PO BOX 130, WEST PALM BEACH, FL 33402-0130
PO BOX 131, WEST PALM BEACH, FL 33402-0131
PO BOX 132, WEST PALM BEACH, FL 33402-0132
PO BOX 133, WEST PALM BEACH, FL 33402-0133
PO BOX 134, WEST PALM BEACH, FL 33402-0134
PO BOX 135, WEST PALM BEACH, FL 33402-0135
PO BOX 136, WEST PALM BEACH, FL 33402-0136
PO BOX 137, WEST PALM BEACH, FL 33402-0137
PO BOX 138, WEST PALM BEACH, FL 33402-0138
PO BOX 139, WEST PALM BEACH, FL 33402-0139
PO BOX 140, WEST PALM BEACH, FL 33402-0140
PO BOX 141, WEST PALM BEACH, FL 33402-0141
PO BOX 142, WEST PALM BEACH, FL 33402-0142
PO BOX 143, WEST PALM BEACH, FL 33402-0143
PO BOX 144, WEST PALM BEACH, FL 33402-0144
PO BOX 145, WEST PALM BEACH, FL 33402-0145
PO BOX 146, WEST PALM BEACH, FL 33402-0146
PO BOX 147, WEST PALM BEACH, FL 33402-0147
PO BOX 148, WEST PALM BEACH, FL 33402-0148
PO BOX 149, WEST PALM BEACH, FL 33402-0149
PO BOX 150, WEST PALM BEACH, FL 33402-0150
PO BOX 151, WEST PALM BEACH, FL 33402-0151
PO BOX 152, WEST PALM BEACH, FL 33402-0152
PO BOX 153, WEST PALM BEACH, FL 33402-0153
PO BOX 154, WEST PALM BEACH, FL 33402-0154
PO BOX 155, WEST PALM BEACH, FL 33402-0155
PO BOX 156, WEST PALM BEACH, FL 33402-0156
PO BOX 157, WEST PALM BEACH, FL 33402-0157
PO BOX 158, WEST PALM BEACH, FL 33402-0158
PO BOX 159, WEST PALM BEACH, FL 33402-0159
PO BOX 160, WEST PALM BEACH, FL 33402-0160
PO BOX 161, WEST PALM BEACH, FL 33402-0161
PO BOX 162, WEST PALM BEACH, FL 33402-0162
PO BOX 163, WEST PALM BEACH, FL 33402-0163
PO BOX 164, WEST PALM BEACH, FL 33402-0164
PO BOX 165, WEST PALM BEACH, FL 33402-0165
PO BOX 166, WEST PALM BEACH, FL 33402-0166
PO BOX 167, WEST PALM BEACH, FL 33402-0167
PO BOX 168, WEST PALM BEACH, FL 33402-0168
PO BOX 169, WEST PALM BEACH, FL 33402-0169
PO BOX 170, WEST PALM BEACH, FL 33402-0170
PO BOX 171, WEST PALM BEACH, FL 33402-0171
PO BOX 172, WEST PALM BEACH, FL 33402-0172
PO BOX 173, WEST PALM BEACH, FL 33402-0173
PO BOX 174, WEST PALM BEACH, FL 33402-0174
PO BOX 175, WEST PALM BEACH, FL 33402-0175
PO BOX 176, WEST PALM BEACH, FL 33402-0176
PO BOX 177, WEST PALM BEACH, FL 33402-0177
PO BOX 178, WEST PALM BEACH, FL 33402-0178
PO BOX 179, WEST PALM BEACH, FL 33402-0179
PO BOX 180, WEST PALM BEACH, FL 33402-0180
PO BOX 181, WEST PALM BEACH, FL 33402-0181
PO BOX 182, WEST PALM BEACH, FL 33402-0182
PO BOX 183, WEST PALM BEACH, FL 33402-0183
PO BOX 184, WEST PALM BEACH, FL 33402-0184
PO BOX 185, WEST PALM BEACH, FL 33402-0185
PO BOX 186, WEST PALM BEACH, FL 33402-0186
PO BOX 187, WEST PALM BEACH, FL 33402-0187
PO BOX 188, WEST PALM BEACH, FL 33402-0188
PO BOX 189, WEST PALM BEACH, FL 33402-0189
PO BOX 190, WEST PALM BEACH, FL 33402-0190
PO BOX 191, WEST PALM BEACH, FL 33402-0191
PO BOX 192, WEST PALM BEACH, FL 33402-0192
PO BOX 193, WEST PALM BEACH, FL 33402-0193
PO BOX 194, WEST PALM BEACH, FL 33402-0194
PO BOX 195, WEST PALM BEACH, FL 33402-0195
PO BOX 196, WEST PALM BEACH, FL 33402-0196
PO BOX 197, WEST PALM BEACH, FL 33402-0197
PO BOX 198, WEST PALM BEACH, FL 33402-0198
PO BOX 199, WEST PALM BEACH, FL 33402-0199
PO BOX 200, WEST PALM BEACH, FL 33402-0200
PO BOX 201, WEST PALM BEACH, FL 33402-0201
PO BOX 202, WEST PALM BEACH, FL 33402-0202
PO BOX 203, WEST PALM BEACH, FL 33402-0203
PO BOX 204, WEST PALM BEACH, FL 33402-0204
PO BOX 205, WEST PALM BEACH, FL 33402-0205
PO BOX 206, WEST PALM BEACH, FL 33402-0206
PO BOX 207, WEST PALM BEACH, FL 33402-0207
PO BOX 208, WEST PALM BEACH, FL 33402-0208
PO BOX 209, WEST PALM BEACH, FL 33402-0209
PO BOX 210, WEST PALM BEACH, FL 33402-0210
PO BOX 211, WEST PALM BEACH, FL 33402-0211
PO BOX 212, WEST PALM BEACH, FL 33402-0212
PO BOX 213, WEST PALM BEACH, FL 33402-0213
PO BOX 214, WEST PALM BEACH, FL 33402-0214
PO BOX 215, WEST PALM BEACH, FL 33402-0215
PO BOX 216, WEST PALM BEACH, FL 33402-0216
PO BOX 217, WEST PALM BEACH, FL 33402-0217
PO BOX 218, WEST PALM BEACH, FL 33402-0218
PO BOX 219, WEST PALM BEACH, FL 33402-0219
PO BOX 220, WEST PALM BEACH, FL 33402-0220
PO BOX 221, WEST PALM BEACH, FL 33402-0221
PO BOX 222, WEST PALM BEACH, FL 33402-0222
PO BOX 223, WEST PALM BEACH, FL 33402-0223
PO BOX 224, WEST PALM BEACH, FL 33402-0224
PO BOX 225, WEST PALM BEACH, FL 33402-0225
PO BOX 226, WEST PALM BEACH, FL 33402-0226
PO BOX 227, WEST PALM BEACH, FL 33402-0227
PO BOX 228, WEST PALM BEACH, FL 33402-0228
PO BOX 229, WEST PALM BEACH, FL 33402-0229
PO BOX 230, WEST PALM BEACH, FL 33402-0230
PO BOX 231, WEST PALM BEACH, FL 33402-0231
PO BOX 232, WEST PALM BEACH, FL 33402-0232
PO BOX 233, WEST PALM BEACH, FL 33402-0233
PO BOX 234, WEST PALM BEACH, FL 33402-0234
PO BOX 235, WEST PALM BEACH, FL 33402-0235
PO BOX 236, WEST PALM BEACH, FL 33402-0236
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