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 181, VALLEY CENTER, CA 92082-0181
PO BOX 182, VALLEY CENTER, CA 92082-0182
PO BOX 183, VALLEY CENTER, CA 92082-0183
PO BOX 184, VALLEY CENTER, CA 92082-0184
PO BOX 185, VALLEY CENTER, CA 92082-0185
PO BOX 186, VALLEY CENTER, CA 92082-0186
PO BOX 187, VALLEY CENTER, CA 92082-0187
PO BOX 188, VALLEY CENTER, CA 92082-0188
PO BOX 189, VALLEY CENTER, CA 92082-0189
PO BOX 190, VALLEY CENTER, CA 92082-0190
PO BOX 191, VALLEY CENTER, CA 92082-0191
PO BOX 192, VALLEY CENTER, CA 92082-0192
PO BOX 193, VALLEY CENTER, CA 92082-0193
PO BOX 194, VALLEY CENTER, CA 92082-0194
PO BOX 195, VALLEY CENTER, CA 92082-0195
PO BOX 196, VALLEY CENTER, CA 92082-0196
PO BOX 197, VALLEY CENTER, CA 92082-0197
PO BOX 198, VALLEY CENTER, CA 92082-0198
PO BOX 199, VALLEY CENTER, CA 92082-0199
PO BOX 200, VALLEY CENTER, CA 92082-0200
PO BOX 201, VALLEY CENTER, CA 92082-0201
PO BOX 202, VALLEY CENTER, CA 92082-0202
PO BOX 203, VALLEY CENTER, CA 92082-0203
PO BOX 204, VALLEY CENTER, CA 92082-0204
PO BOX 205, VALLEY CENTER, CA 92082-0205
PO BOX 206, VALLEY CENTER, CA 92082-0206
PO BOX 207, VALLEY CENTER, CA 92082-0207
PO BOX 208, VALLEY CENTER, CA 92082-0208
PO BOX 209, VALLEY CENTER, CA 92082-0209
PO BOX 210, VALLEY CENTER, CA 92082-0210
PO BOX 211, VALLEY CENTER, CA 92082-0211
PO BOX 212, VALLEY CENTER, CA 92082-0212
PO BOX 213, VALLEY CENTER, CA 92082-0213
PO BOX 214, VALLEY CENTER, CA 92082-0214
PO BOX 215, VALLEY CENTER, CA 92082-0215
PO BOX 216, VALLEY CENTER, CA 92082-0216
PO BOX 217, VALLEY CENTER, CA 92082-0217
PO BOX 218, VALLEY CENTER, CA 92082-0218
PO BOX 219, VALLEY CENTER, CA 92082-0219
PO BOX 220, VALLEY CENTER, CA 92082-0220
PO BOX 221, VALLEY CENTER, CA 92082-0221
PO BOX 222, VALLEY CENTER, CA 92082-0222
PO BOX 223, VALLEY CENTER, CA 92082-0223
PO BOX 224, VALLEY CENTER, CA 92082-0224
PO BOX 225, VALLEY CENTER, CA 92082-0225
PO BOX 226, VALLEY CENTER, CA 92082-0226
PO BOX 227, VALLEY CENTER, CA 92082-0227
PO BOX 228, VALLEY CENTER, CA 92082-0228
PO BOX 229, VALLEY CENTER, CA 92082-0229
PO BOX 230, VALLEY CENTER, CA 92082-0230
PO BOX 231, VALLEY CENTER, CA 92082-0231
PO BOX 232, VALLEY CENTER, CA 92082-0232
PO BOX 233, VALLEY CENTER, CA 92082-0233
PO BOX 234, VALLEY CENTER, CA 92082-0234
PO BOX 235, VALLEY CENTER, CA 92082-0235
PO BOX 236, VALLEY CENTER, CA 92082-0236
PO BOX 237, VALLEY CENTER, CA 92082-0237
PO BOX 238, VALLEY CENTER, CA 92082-0238
PO BOX 239, VALLEY CENTER, CA 92082-0239
PO BOX 240, VALLEY CENTER, CA 92082-0240
PO BOX 241, VALLEY CENTER, CA 92082-0241
PO BOX 242, VALLEY CENTER, CA 92082-0242
PO BOX 243, VALLEY CENTER, CA 92082-0243
PO BOX 244, VALLEY CENTER, CA 92082-0244
PO BOX 245, VALLEY CENTER, CA 92082-0245
PO BOX 246, VALLEY CENTER, CA 92082-0246
PO BOX 247, VALLEY CENTER, CA 92082-0247
PO BOX 248, VALLEY CENTER, CA 92082-0248
PO BOX 249, VALLEY CENTER, CA 92082-0249
PO BOX 250, VALLEY CENTER, CA 92082-0250
PO BOX 251, VALLEY CENTER, CA 92082-0251
PO BOX 252, VALLEY CENTER, CA 92082-0252
PO BOX 253, VALLEY CENTER, CA 92082-0253
PO BOX 254, VALLEY CENTER, CA 92082-0254
PO BOX 255, VALLEY CENTER, CA 92082-0255
PO BOX 256, VALLEY CENTER, CA 92082-0256
PO BOX 257, VALLEY CENTER, CA 92082-0257
PO BOX 258, VALLEY CENTER, CA 92082-0258
PO BOX 259, VALLEY CENTER, CA 92082-0259
PO BOX 260, VALLEY CENTER, CA 92082-0260
PO BOX 261, VALLEY CENTER, CA 92082-0261
PO BOX 262, VALLEY CENTER, CA 92082-0262
PO BOX 263, VALLEY CENTER, CA 92082-0263
PO BOX 264, VALLEY CENTER, CA 92082-0264
PO BOX 265, VALLEY CENTER, CA 92082-0265
PO BOX 266, VALLEY CENTER, CA 92082-0266
PO BOX 267, VALLEY CENTER, CA 92082-0267
PO BOX 268, VALLEY CENTER, CA 92082-0268
PO BOX 269, VALLEY CENTER, CA 92082-0269
PO BOX 270, VALLEY CENTER, CA 92082-0270
PO BOX 271, VALLEY CENTER, CA 92082-0271
PO BOX 272, VALLEY CENTER, CA 92082-0272
PO BOX 273, VALLEY CENTER, CA 92082-0273
PO BOX 274, VALLEY CENTER, CA 92082-0274
PO BOX 275, VALLEY CENTER, CA 92082-0275
PO BOX 276, VALLEY CENTER, CA 92082-0276
PO BOX 277, VALLEY CENTER, CA 92082-0277
PO BOX 278, VALLEY CENTER, CA 92082-0278
PO BOX 279, VALLEY CENTER, CA 92082-0279
PO BOX 280, VALLEY CENTER, CA 92082-0280
PO BOX 281, VALLEY CENTER, CA 92082-0281
PO BOX 282, VALLEY CENTER, CA 92082-0282
PO BOX 283, VALLEY CENTER, CA 92082-0283
PO BOX 284, VALLEY CENTER, CA 92082-0284
PO BOX 285, VALLEY CENTER, CA 92082-0285
PO BOX 286, VALLEY CENTER, CA 92082-0286
PO BOX 287, VALLEY CENTER, CA 92082-0287
PO BOX 288, VALLEY CENTER, CA 92082-0288
PO BOX 289, VALLEY CENTER, CA 92082-0289
PO BOX 290, VALLEY CENTER, CA 92082-0290
PO BOX 291, VALLEY CENTER, CA 92082-0291
PO BOX 292, VALLEY CENTER, CA 92082-0292
PO BOX 293, VALLEY CENTER, CA 92082-0293
PO BOX 294, VALLEY CENTER, CA 92082-0294
PO BOX 295, VALLEY CENTER, CA 92082-0295
PO BOX 296, VALLEY CENTER, CA 92082-0296
PO BOX 297, VALLEY CENTER, CA 92082-0297
PO BOX 298, VALLEY CENTER, CA 92082-0298
PO BOX 299, VALLEY CENTER, CA 92082-0299
PO BOX 300, VALLEY CENTER, CA 92082-0300
PO BOX 301, VALLEY CENTER, CA 92082-0301
PO BOX 302, VALLEY CENTER, CA 92082-0302
PO BOX 303, VALLEY CENTER, CA 92082-0303
PO BOX 304, VALLEY CENTER, CA 92082-0304
PO BOX 305, VALLEY CENTER, CA 92082-0305
PO BOX 306, VALLEY CENTER, CA 92082-0306
PO BOX 307, VALLEY CENTER, CA 92082-0307
PO BOX 308, VALLEY CENTER, CA 92082-0308
PO BOX 309, VALLEY CENTER, CA 92082-0309
PO BOX 310, VALLEY CENTER, CA 92082-0310
PO BOX 311, VALLEY CENTER, CA 92082-0311
PO BOX 312, VALLEY CENTER, CA 92082-0312
PO BOX 313, VALLEY CENTER, CA 92082-0313
PO BOX 314, VALLEY CENTER, CA 92082-0314
PO BOX 315, VALLEY CENTER, CA 92082-0315
PO BOX 316, VALLEY CENTER, CA 92082-0316
PO BOX 317, VALLEY CENTER, CA 92082-0317
PO BOX 318, VALLEY CENTER, CA 92082-0318
PO BOX 319, VALLEY CENTER, CA 92082-0319
PO BOX 320, VALLEY CENTER, CA 92082-0320
PO BOX 321, VALLEY CENTER, CA 92082-0321
PO BOX 322, VALLEY CENTER, CA 92082-0322
PO BOX 323, VALLEY CENTER, CA 92082-0323
PO BOX 324, VALLEY CENTER, CA 92082-0324
PO BOX 325, VALLEY CENTER, CA 92082-0325
PO BOX 326, VALLEY CENTER, CA 92082-0326
PO BOX 327, VALLEY CENTER, CA 92082-0327
PO BOX 328, VALLEY CENTER, CA 92082-0328
PO BOX 329, VALLEY CENTER, CA 92082-0329
PO BOX 330, VALLEY CENTER, CA 92082-0330
PO BOX 331, VALLEY CENTER, CA 92082-0331
PO BOX 332, VALLEY CENTER, CA 92082-0332
PO BOX 333, VALLEY CENTER, CA 92082-0333
PO BOX 334, VALLEY CENTER, CA 92082-0334
PO BOX 335, VALLEY CENTER, CA 92082-0335
PO BOX 336, VALLEY CENTER, CA 92082-0336
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