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 301, PORTSMOUTH, VA 23705-0301
PO BOX 302, PORTSMOUTH, VA 23705-0302
PO BOX 303, PORTSMOUTH, VA 23705-0303
PO BOX 304, PORTSMOUTH, VA 23705-0304
PO BOX 305, PORTSMOUTH, VA 23705-0305
PO BOX 306, PORTSMOUTH, VA 23705-0306
PO BOX 307, PORTSMOUTH, VA 23705-0307
PO BOX 308, PORTSMOUTH, VA 23705-0308
PO BOX 309, PORTSMOUTH, VA 23705-0309
PO BOX 310, PORTSMOUTH, VA 23705-0310
PO BOX 311, PORTSMOUTH, VA 23705-0311
PO BOX 312, PORTSMOUTH, VA 23705-0312
PO BOX 313, PORTSMOUTH, VA 23705-0313
PO BOX 314, PORTSMOUTH, VA 23705-0314
PO BOX 315, PORTSMOUTH, VA 23705-0315
PO BOX 316, PORTSMOUTH, VA 23705-0316
PO BOX 317, PORTSMOUTH, VA 23705-0317
PO BOX 318, PORTSMOUTH, VA 23705-0318
PO BOX 319, PORTSMOUTH, VA 23705-0319
PO BOX 320, PORTSMOUTH, VA 23705-0320
PO BOX 321, PORTSMOUTH, VA 23705-0321
PO BOX 322, PORTSMOUTH, VA 23705-0322
PO BOX 323, PORTSMOUTH, VA 23705-0323
PO BOX 324, PORTSMOUTH, VA 23705-0324
PO BOX 325, PORTSMOUTH, VA 23705-0325
PO BOX 326, PORTSMOUTH, VA 23705-0326
PO BOX 327, PORTSMOUTH, VA 23705-0327
PO BOX 328, PORTSMOUTH, VA 23705-0328
PO BOX 329, PORTSMOUTH, VA 23705-0329
PO BOX 330, PORTSMOUTH, VA 23705-0330
PO BOX 331, PORTSMOUTH, VA 23705-0331
PO BOX 332, PORTSMOUTH, VA 23705-0332
PO BOX 333, PORTSMOUTH, VA 23705-0333
PO BOX 334, PORTSMOUTH, VA 23705-0334
PO BOX 335, PORTSMOUTH, VA 23705-0335
PO BOX 336, PORTSMOUTH, VA 23705-0336
PO BOX 337, PORTSMOUTH, VA 23705-0337
PO BOX 338, PORTSMOUTH, VA 23705-0338
PO BOX 339, PORTSMOUTH, VA 23705-0339
PO BOX 340, PORTSMOUTH, VA 23705-0340
PO BOX 341, PORTSMOUTH, VA 23705-0341
PO BOX 342, PORTSMOUTH, VA 23705-0342
PO BOX 343, PORTSMOUTH, VA 23705-0343
PO BOX 344, PORTSMOUTH, VA 23705-0344
PO BOX 345, PORTSMOUTH, VA 23705-0345
PO BOX 346, PORTSMOUTH, VA 23705-0346
PO BOX 347, PORTSMOUTH, VA 23705-0347
PO BOX 348, PORTSMOUTH, VA 23705-0348
PO BOX 349, PORTSMOUTH, VA 23705-0349
PO BOX 350, PORTSMOUTH, VA 23705-0350
PO BOX 351, PORTSMOUTH, VA 23705-0351
PO BOX 352, PORTSMOUTH, VA 23705-0352
PO BOX 353, PORTSMOUTH, VA 23705-0353
PO BOX 354, PORTSMOUTH, VA 23705-0354
PO BOX 355, PORTSMOUTH, VA 23705-0355
PO BOX 356, PORTSMOUTH, VA 23705-0356
PO BOX 357, PORTSMOUTH, VA 23705-0357
PO BOX 358, PORTSMOUTH, VA 23705-0358
PO BOX 359, PORTSMOUTH, VA 23705-0359
PO BOX 360, PORTSMOUTH, VA 23705-0360
PO BOX 361, PORTSMOUTH, VA 23705-0361
PO BOX 362, PORTSMOUTH, VA 23705-0362
PO BOX 363, PORTSMOUTH, VA 23705-0363
PO BOX 364, PORTSMOUTH, VA 23705-0364
PO BOX 365, PORTSMOUTH, VA 23705-0365
PO BOX 366, PORTSMOUTH, VA 23705-0366
PO BOX 367, PORTSMOUTH, VA 23705-0367
PO BOX 368, PORTSMOUTH, VA 23705-0368
PO BOX 369, PORTSMOUTH, VA 23705-0369
PO BOX 370, PORTSMOUTH, VA 23705-0370
PO BOX 371, PORTSMOUTH, VA 23705-0371
PO BOX 372, PORTSMOUTH, VA 23705-0372
PO BOX 373, PORTSMOUTH, VA 23705-0373
PO BOX 374, PORTSMOUTH, VA 23705-0374
PO BOX 375, PORTSMOUTH, VA 23705-0375
PO BOX 376, PORTSMOUTH, VA 23705-0376
PO BOX 377, PORTSMOUTH, VA 23705-0377
PO BOX 378, PORTSMOUTH, VA 23705-0378
PO BOX 379, PORTSMOUTH, VA 23705-0379
PO BOX 380, PORTSMOUTH, VA 23705-0380
PO BOX 381, PORTSMOUTH, VA 23705-0381
PO BOX 382, PORTSMOUTH, VA 23705-0382
PO BOX 383, PORTSMOUTH, VA 23705-0383
PO BOX 384, PORTSMOUTH, VA 23705-0384
PO BOX 385, PORTSMOUTH, VA 23705-0385
PO BOX 386, PORTSMOUTH, VA 23705-0386
PO BOX 387, PORTSMOUTH, VA 23705-0387
PO BOX 388, PORTSMOUTH, VA 23705-0388
PO BOX 389, PORTSMOUTH, VA 23705-0389
PO BOX 390, PORTSMOUTH, VA 23705-0390
PO BOX 391, PORTSMOUTH, VA 23705-0391
PO BOX 392, PORTSMOUTH, VA 23705-0392
PO BOX 393, PORTSMOUTH, VA 23705-0393
PO BOX 394, PORTSMOUTH, VA 23705-0394
PO BOX 395, PORTSMOUTH, VA 23705-0395
PO BOX 396, PORTSMOUTH, VA 23705-0396
PO BOX 397, PORTSMOUTH, VA 23705-0397
PO BOX 398, PORTSMOUTH, VA 23705-0398
PO BOX 399, PORTSMOUTH, VA 23705-0399
PO BOX 400, PORTSMOUTH, VA 23705-0400
PO BOX 401, PORTSMOUTH, VA 23705-0401
PO BOX 402, PORTSMOUTH, VA 23705-0402
PO BOX 403, PORTSMOUTH, VA 23705-0403
PO BOX 404, PORTSMOUTH, VA 23705-0404
PO BOX 405, PORTSMOUTH, VA 23705-0405
PO BOX 406, PORTSMOUTH, VA 23705-0406
PO BOX 407, PORTSMOUTH, VA 23705-0407
PO BOX 408, PORTSMOUTH, VA 23705-0408
PO BOX 409, PORTSMOUTH, VA 23705-0409
PO BOX 410, PORTSMOUTH, VA 23705-0410
PO BOX 411, PORTSMOUTH, VA 23705-0411
PO BOX 412, PORTSMOUTH, VA 23705-0412
PO BOX 413, PORTSMOUTH, VA 23705-0413
PO BOX 414, PORTSMOUTH, VA 23705-0414
PO BOX 415, PORTSMOUTH, VA 23705-0415
PO BOX 416, PORTSMOUTH, VA 23705-0416
PO BOX 417, PORTSMOUTH, VA 23705-0417
PO BOX 418, PORTSMOUTH, VA 23705-0418
PO BOX 419, PORTSMOUTH, VA 23705-0419
PO BOX 420, PORTSMOUTH, VA 23705-0420
PO BOX 421, PORTSMOUTH, VA 23705-0421
PO BOX 422, PORTSMOUTH, VA 23705-0422
PO BOX 423, PORTSMOUTH, VA 23705-0423
PO BOX 424, PORTSMOUTH, VA 23705-0424
PO BOX 425, PORTSMOUTH, VA 23705-0425
PO BOX 426, PORTSMOUTH, VA 23705-0426
PO BOX 427, PORTSMOUTH, VA 23705-0427
PO BOX 428, PORTSMOUTH, VA 23705-0428
PO BOX 429, PORTSMOUTH, VA 23705-0429
PO BOX 430, PORTSMOUTH, VA 23705-0430
PO BOX 431, PORTSMOUTH, VA 23705-0431
PO BOX 432, PORTSMOUTH, VA 23705-0432
PO BOX 433, PORTSMOUTH, VA 23705-0433
PO BOX 434, PORTSMOUTH, VA 23705-0434
PO BOX 435, PORTSMOUTH, VA 23705-0435
PO BOX 436, PORTSMOUTH, VA 23705-0436
PO BOX 437, PORTSMOUTH, VA 23705-0437
PO BOX 438, PORTSMOUTH, VA 23705-0438
PO BOX 439, PORTSMOUTH, VA 23705-0439
PO BOX 440, PORTSMOUTH, VA 23705-0440
PO BOX 441, PORTSMOUTH, VA 23705-0441
PO BOX 442, PORTSMOUTH, VA 23705-0442
PO BOX 443, PORTSMOUTH, VA 23705-0443
PO BOX 444, PORTSMOUTH, VA 23705-0444
PO BOX 445, PORTSMOUTH, VA 23705-0445
PO BOX 446, PORTSMOUTH, VA 23705-0446
PO BOX 447, PORTSMOUTH, VA 23705-0447
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