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 151, SAN BERNARDINO, CA 92402-0151
PO BOX 152, SAN BERNARDINO, CA 92402-0152
PO BOX 153, SAN BERNARDINO, CA 92402-0153
PO BOX 154, SAN BERNARDINO, CA 92402-0154
PO BOX 155, SAN BERNARDINO, CA 92402-0155
PO BOX 156, SAN BERNARDINO, CA 92402-0156
PO BOX 157, SAN BERNARDINO, CA 92402-0157
PO BOX 158, SAN BERNARDINO, CA 92402-0158
PO BOX 159, SAN BERNARDINO, CA 92402-0159
PO BOX 160, SAN BERNARDINO, CA 92402-0160
PO BOX 161, SAN BERNARDINO, CA 92402-0161
PO BOX 162, SAN BERNARDINO, CA 92402-0162
PO BOX 163, SAN BERNARDINO, CA 92402-0163
PO BOX 164, SAN BERNARDINO, CA 92402-0164
PO BOX 165, SAN BERNARDINO, CA 92402-0165
PO BOX 166, SAN BERNARDINO, CA 92402-0166
PO BOX 167, SAN BERNARDINO, CA 92402-0167
PO BOX 168, SAN BERNARDINO, CA 92402-0168
PO BOX 169, SAN BERNARDINO, CA 92402-0169
PO BOX 170, SAN BERNARDINO, CA 92402-0170
PO BOX 171, SAN BERNARDINO, CA 92402-0171
PO BOX 172, SAN BERNARDINO, CA 92402-0172
PO BOX 173, SAN BERNARDINO, CA 92402-0173
PO BOX 174, SAN BERNARDINO, CA 92402-0174
PO BOX 175, SAN BERNARDINO, CA 92402-0175
PO BOX 176, SAN BERNARDINO, CA 92402-0176
PO BOX 177, SAN BERNARDINO, CA 92402-0177
PO BOX 178, SAN BERNARDINO, CA 92402-0178
PO BOX 179, SAN BERNARDINO, CA 92402-0179
PO BOX 180, SAN BERNARDINO, CA 92402-0180
PO BOX 181, SAN BERNARDINO, CA 92402-0181
PO BOX 182, SAN BERNARDINO, CA 92402-0182
PO BOX 183, SAN BERNARDINO, CA 92402-0183
PO BOX 184, SAN BERNARDINO, CA 92402-0184
PO BOX 185, SAN BERNARDINO, CA 92402-0185
PO BOX 186, SAN BERNARDINO, CA 92402-0186
PO BOX 187, SAN BERNARDINO, CA 92402-0187
PO BOX 188, SAN BERNARDINO, CA 92402-0188
PO BOX 189, SAN BERNARDINO, CA 92402-0189
PO BOX 190, SAN BERNARDINO, CA 92402-0190
PO BOX 191, SAN BERNARDINO, CA 92402-0191
PO BOX 192, SAN BERNARDINO, CA 92402-0192
PO BOX 193, SAN BERNARDINO, CA 92402-0193
PO BOX 194, SAN BERNARDINO, CA 92402-0194
PO BOX 195, SAN BERNARDINO, CA 92402-0195
PO BOX 196, SAN BERNARDINO, CA 92402-0196
PO BOX 197, SAN BERNARDINO, CA 92402-0197
PO BOX 198, SAN BERNARDINO, CA 92402-0198
PO BOX 199, SAN BERNARDINO, CA 92402-0199
PO BOX 200, SAN BERNARDINO, CA 92402-0200
PO BOX 201, SAN BERNARDINO, CA 92402-0201
PO BOX 202, SAN BERNARDINO, CA 92402-0202
PO BOX 203, SAN BERNARDINO, CA 92402-0203
PO BOX 204, SAN BERNARDINO, CA 92402-0204
PO BOX 205, SAN BERNARDINO, CA 92402-0205
PO BOX 206, SAN BERNARDINO, CA 92402-0206
PO BOX 207, SAN BERNARDINO, CA 92402-0207
PO BOX 208, SAN BERNARDINO, CA 92402-0208
PO BOX 209, SAN BERNARDINO, CA 92402-0209
PO BOX 210, SAN BERNARDINO, CA 92402-0210
PO BOX 211, SAN BERNARDINO, CA 92402-0211
PO BOX 212, SAN BERNARDINO, CA 92402-0212
PO BOX 213, SAN BERNARDINO, CA 92402-0213
PO BOX 214, SAN BERNARDINO, CA 92402-0214
PO BOX 215, SAN BERNARDINO, CA 92402-0215
PO BOX 216, SAN BERNARDINO, CA 92402-0216
PO BOX 217, SAN BERNARDINO, CA 92402-0217
PO BOX 218, SAN BERNARDINO, CA 92402-0218
PO BOX 219, SAN BERNARDINO, CA 92402-0219
PO BOX 220, SAN BERNARDINO, CA 92402-0220
PO BOX 221, SAN BERNARDINO, CA 92402-0221
PO BOX 222, SAN BERNARDINO, CA 92402-0222
PO BOX 223, SAN BERNARDINO, CA 92402-0223
PO BOX 224, SAN BERNARDINO, CA 92402-0224
PO BOX 225, SAN BERNARDINO, CA 92402-0225
PO BOX 226, SAN BERNARDINO, CA 92402-0226
PO BOX 227, SAN BERNARDINO, CA 92402-0227
PO BOX 228, SAN BERNARDINO, CA 92402-0228
PO BOX 229, SAN BERNARDINO, CA 92402-0229
PO BOX 230, SAN BERNARDINO, CA 92402-0230
PO BOX 231, SAN BERNARDINO, CA 92402-0231
PO BOX 232, SAN BERNARDINO, CA 92402-0232
PO BOX 233, SAN BERNARDINO, CA 92402-0233
PO BOX 234, SAN BERNARDINO, CA 92402-0234
PO BOX 235, SAN BERNARDINO, CA 92402-0235
PO BOX 236, SAN BERNARDINO, CA 92402-0236
PO BOX 237, SAN BERNARDINO, CA 92402-0237
PO BOX 238, SAN BERNARDINO, CA 92402-0238
PO BOX 239, SAN BERNARDINO, CA 92402-0239
PO BOX 240, SAN BERNARDINO, CA 92402-0240
PO BOX 241, SAN BERNARDINO, CA 92402-0241
PO BOX 242, SAN BERNARDINO, CA 92402-0242
PO BOX 243, SAN BERNARDINO, CA 92402-0243
PO BOX 244, SAN BERNARDINO, CA 92402-0244
PO BOX 245, SAN BERNARDINO, CA 92402-0245
PO BOX 246, SAN BERNARDINO, CA 92402-0246
PO BOX 247, SAN BERNARDINO, CA 92402-0247
PO BOX 248, SAN BERNARDINO, CA 92402-0248
PO BOX 249, SAN BERNARDINO, CA 92402-0249
PO BOX 250, SAN BERNARDINO, CA 92402-0250
PO BOX 251, SAN BERNARDINO, CA 92402-0251
PO BOX 252, SAN BERNARDINO, CA 92402-0252
PO BOX 253, SAN BERNARDINO, CA 92402-0253
PO BOX 254, SAN BERNARDINO, CA 92402-0254
PO BOX 255, SAN BERNARDINO, CA 92402-0255
PO BOX 256, SAN BERNARDINO, CA 92402-0256
PO BOX 257, SAN BERNARDINO, CA 92402-0257
PO BOX 258, SAN BERNARDINO, CA 92402-0258
PO BOX 259, SAN BERNARDINO, CA 92402-0259
PO BOX 260, SAN BERNARDINO, CA 92402-0260
PO BOX 261, SAN BERNARDINO, CA 92402-0261
PO BOX 262, SAN BERNARDINO, CA 92402-0262
PO BOX 263, SAN BERNARDINO, CA 92402-0263
PO BOX 264, SAN BERNARDINO, CA 92402-0264
PO BOX 265, SAN BERNARDINO, CA 92402-0265
PO BOX 266, SAN BERNARDINO, CA 92402-0266
PO BOX 267, SAN BERNARDINO, CA 92402-0267
PO BOX 268, SAN BERNARDINO, CA 92402-0268
PO BOX 269, SAN BERNARDINO, CA 92402-0269
PO BOX 270, SAN BERNARDINO, CA 92402-0270
PO BOX 271, SAN BERNARDINO, CA 92402-0271
PO BOX 272, SAN BERNARDINO, CA 92402-0272
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