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 230, CONTINENTAL DIVIDE, NM 87312-0230
PO BOX 231, CONTINENTAL DIVIDE, NM 87312-0231
PO BOX 232, CONTINENTAL DIVIDE, NM 87312-0232
PO BOX 233, CONTINENTAL DIVIDE, NM 87312-0233
PO BOX 234, CONTINENTAL DIVIDE, NM 87312-0234
PO BOX 235, CONTINENTAL DIVIDE, NM 87312-0235
PO BOX 236, CONTINENTAL DIVIDE, NM 87312-0236
PO BOX 237, CONTINENTAL DIVIDE, NM 87312-0237
PO BOX 238, CONTINENTAL DIVIDE, NM 87312-0238
PO BOX 239, CONTINENTAL DIVIDE, NM 87312-0239
PO BOX 240, CONTINENTAL DIVIDE, NM 87312-0240
PO BOX 241, CONTINENTAL DIVIDE, NM 87312-0241
PO BOX 242, CONTINENTAL DIVIDE, NM 87312-0242
PO BOX 243, CONTINENTAL DIVIDE, NM 87312-0243
PO BOX 244, CONTINENTAL DIVIDE, NM 87312-0244
PO BOX 245, CONTINENTAL DIVIDE, NM 87312-0245
PO BOX 246, CONTINENTAL DIVIDE, NM 87312-0246
PO BOX 247, CONTINENTAL DIVIDE, NM 87312-0247
PO BOX 248, CONTINENTAL DIVIDE, NM 87312-0248
PO BOX 249, CONTINENTAL DIVIDE, NM 87312-0249
PO BOX 250, CONTINENTAL DIVIDE, NM 87312-0250
PO BOX 251, CONTINENTAL DIVIDE, NM 87312-0251
PO BOX 252, CONTINENTAL DIVIDE, NM 87312-0252
PO BOX 253, CONTINENTAL DIVIDE, NM 87312-0253
PO BOX 254, CONTINENTAL DIVIDE, NM 87312-0254
PO BOX 255, CONTINENTAL DIVIDE, NM 87312-0255
PO BOX 256, CONTINENTAL DIVIDE, NM 87312-0256
PO BOX 257, CONTINENTAL DIVIDE, NM 87312-0257
PO BOX 258, CONTINENTAL DIVIDE, NM 87312-0258
PO BOX 259, CONTINENTAL DIVIDE, NM 87312-0259
PO BOX 260, CONTINENTAL DIVIDE, NM 87312-0260
PO BOX 261, CONTINENTAL DIVIDE, NM 87312-0261
PO BOX 262, CONTINENTAL DIVIDE, NM 87312-0262
PO BOX 263, CONTINENTAL DIVIDE, NM 87312-0263
PO BOX 264, CONTINENTAL DIVIDE, NM 87312-0264
PO BOX 265, CONTINENTAL DIVIDE, NM 87312-0265
PO BOX 266, CONTINENTAL DIVIDE, NM 87312-0266
PO BOX 267, CONTINENTAL DIVIDE, NM 87312-0267
PO BOX 268, CONTINENTAL DIVIDE, NM 87312-0268
PO BOX 269, CONTINENTAL DIVIDE, NM 87312-0269
PO BOX 270, CONTINENTAL DIVIDE, NM 87312-0270
PO BOX 271, CONTINENTAL DIVIDE, NM 87312-0271
PO BOX 272, CONTINENTAL DIVIDE, NM 87312-0272
PO BOX 273, CONTINENTAL DIVIDE, NM 87312-0273
PO BOX 274, CONTINENTAL DIVIDE, NM 87312-0274
PO BOX 275, CONTINENTAL DIVIDE, NM 87312-0275
PO BOX 276, CONTINENTAL DIVIDE, NM 87312-0276
PO BOX 277, CONTINENTAL DIVIDE, NM 87312-0277
PO BOX 278, CONTINENTAL DIVIDE, NM 87312-0278
PO BOX 279, CONTINENTAL DIVIDE, NM 87312-0279
PO BOX 280, CONTINENTAL DIVIDE, NM 87312-0280
PO BOX 281, CONTINENTAL DIVIDE, NM 87312-0281
PO BOX 282, CONTINENTAL DIVIDE, NM 87312-0282
PO BOX 283, CONTINENTAL DIVIDE, NM 87312-0283
PO BOX 284, CONTINENTAL DIVIDE, NM 87312-0284
PO BOX 285, CONTINENTAL DIVIDE, NM 87312-0285
PO BOX 286, CONTINENTAL DIVIDE, NM 87312-0286
PO BOX 287, CONTINENTAL DIVIDE, NM 87312-0287
PO BOX 288, CONTINENTAL DIVIDE, NM 87312-0288
PO BOX 289, CONTINENTAL DIVIDE, NM 87312-0289
PO BOX 290, CONTINENTAL DIVIDE, NM 87312-0290
PO BOX 291, CONTINENTAL DIVIDE, NM 87312-0291
PO BOX 292, CONTINENTAL DIVIDE, NM 87312-0292
PO BOX 293, CONTINENTAL DIVIDE, NM 87312-0293
PO BOX 294, CONTINENTAL DIVIDE, NM 87312-0294
PO BOX 295, CONTINENTAL DIVIDE, NM 87312-0295
PO BOX 296, CONTINENTAL DIVIDE, NM 87312-0296
PO BOX 297, CONTINENTAL DIVIDE, NM 87312-0297
PO BOX 298, CONTINENTAL DIVIDE, NM 87312-0298
PO BOX 299, CONTINENTAL DIVIDE, NM 87312-0299
PO BOX 300, CONTINENTAL DIVIDE, NM 87312-0300
PO BOX 301, CONTINENTAL DIVIDE, NM 87312-0301
PO BOX 302, CONTINENTAL DIVIDE, NM 87312-0302
PO BOX 303, CONTINENTAL DIVIDE, NM 87312-0303
PO BOX 304, CONTINENTAL DIVIDE, NM 87312-0304
PO BOX 305, CONTINENTAL DIVIDE, NM 87312-0305
PO BOX 306, CONTINENTAL DIVIDE, NM 87312-0306
PO BOX 307, CONTINENTAL DIVIDE, NM 87312-0307
PO BOX 308, CONTINENTAL DIVIDE, NM 87312-0308
PO BOX 309, CONTINENTAL DIVIDE, NM 87312-0309
PO BOX 310, CONTINENTAL DIVIDE, NM 87312-0310
PO BOX 311, CONTINENTAL DIVIDE, NM 87312-0311
PO BOX 312, CONTINENTAL DIVIDE, NM 87312-0312
PO BOX 313, CONTINENTAL DIVIDE, NM 87312-0313
PO BOX 314, CONTINENTAL DIVIDE, NM 87312-0314
PO BOX 315, CONTINENTAL DIVIDE, NM 87312-0315
PO BOX 316, CONTINENTAL DIVIDE, NM 87312-0316
PO BOX 317, CONTINENTAL DIVIDE, NM 87312-0317
PO BOX 318, CONTINENTAL DIVIDE, NM 87312-0318
PO BOX 319, CONTINENTAL DIVIDE, NM 87312-0319
PO BOX 320, CONTINENTAL DIVIDE, NM 87312-0320
PO BOX 321, CONTINENTAL DIVIDE, NM 87312-0321
PO BOX 322, CONTINENTAL DIVIDE, NM 87312-0322
PO BOX 323, CONTINENTAL DIVIDE, NM 87312-0323
PO BOX 324, CONTINENTAL DIVIDE, NM 87312-0324
PO BOX 325, CONTINENTAL DIVIDE, NM 87312-0325
PO BOX 326, CONTINENTAL DIVIDE, NM 87312-0326
PO BOX 327, CONTINENTAL DIVIDE, NM 87312-0327
PO BOX 328, CONTINENTAL DIVIDE, NM 87312-0328
PO BOX 329, CONTINENTAL DIVIDE, NM 87312-0329
PO BOX 330, CONTINENTAL DIVIDE, NM 87312-0330
PO BOX 331, CONTINENTAL DIVIDE, NM 87312-0331
PO BOX 332, CONTINENTAL DIVIDE, NM 87312-0332
PO BOX 333, CONTINENTAL DIVIDE, NM 87312-0333
PO BOX 334, CONTINENTAL DIVIDE, NM 87312-0334
PO BOX 335, CONTINENTAL DIVIDE, NM 87312-0335
PO BOX 336, CONTINENTAL DIVIDE, NM 87312-0336
PO BOX 337, CONTINENTAL DIVIDE, NM 87312-0337
PO BOX 338, CONTINENTAL DIVIDE, NM 87312-0338
PO BOX 339, CONTINENTAL DIVIDE, NM 87312-0339
PO BOX 340, CONTINENTAL DIVIDE, NM 87312-0340
PO BOX 341, CONTINENTAL DIVIDE, NM 87312-0341
PO BOX 342, CONTINENTAL DIVIDE, NM 87312-0342
PO BOX 343, CONTINENTAL DIVIDE, NM 87312-0343
PO BOX 344, CONTINENTAL DIVIDE, NM 87312-0344
PO BOX 345, CONTINENTAL DIVIDE, NM 87312-0345
PO BOX 346, CONTINENTAL DIVIDE, NM 87312-0346
PO BOX 347, CONTINENTAL DIVIDE, NM 87312-0347
PO BOX 348, CONTINENTAL DIVIDE, NM 87312-0348
PO BOX 349, CONTINENTAL DIVIDE, NM 87312-0349
PO BOX 350, CONTINENTAL DIVIDE, NM 87312-0350
PO BOX 351, CONTINENTAL DIVIDE, NM 87312-0351
PO BOX 352, CONTINENTAL DIVIDE, NM 87312-0352
PO BOX 353, CONTINENTAL DIVIDE, NM 87312-0353
PO BOX 354, CONTINENTAL DIVIDE, NM 87312-0354
PO BOX 355, CONTINENTAL DIVIDE, NM 87312-0355
PO BOX 356, CONTINENTAL DIVIDE, NM 87312-0356
PO BOX 357, CONTINENTAL DIVIDE, NM 87312-0357
PO BOX 358, CONTINENTAL DIVIDE, NM 87312-0358
PO BOX 359, CONTINENTAL DIVIDE, NM 87312-0359
PO BOX 360, CONTINENTAL DIVIDE, NM 87312-0360
PO BOX 361, CONTINENTAL DIVIDE, NM 87312-0361
PO BOX 362, CONTINENTAL DIVIDE, NM 87312-0362
PO BOX 363, CONTINENTAL DIVIDE, NM 87312-0363
PO BOX 364, CONTINENTAL DIVIDE, NM 87312-0364
PO BOX 365, CONTINENTAL DIVIDE, NM 87312-0365
PO BOX 366, CONTINENTAL DIVIDE, NM 87312-0366
PO BOX 367, CONTINENTAL DIVIDE, NM 87312-0367
PO BOX 368, CONTINENTAL DIVIDE, NM 87312-0368
PO BOX 369, CONTINENTAL DIVIDE, NM 87312-0369
PO BOX 370, CONTINENTAL DIVIDE, NM 87312-0370
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