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 321, CHARLOTTESVILLE, VA 22902-0321
PO BOX 322, CHARLOTTESVILLE, VA 22902-0322
PO BOX 323, CHARLOTTESVILLE, VA 22902-0323
PO BOX 324, CHARLOTTESVILLE, VA 22902-0324
PO BOX 325, CHARLOTTESVILLE, VA 22902-0325
PO BOX 326, CHARLOTTESVILLE, VA 22902-0326
PO BOX 327, CHARLOTTESVILLE, VA 22902-0327
PO BOX 328, CHARLOTTESVILLE, VA 22902-0328
PO BOX 329, CHARLOTTESVILLE, VA 22902-0329
PO BOX 330, CHARLOTTESVILLE, VA 22902-0330
PO BOX 331, CHARLOTTESVILLE, VA 22902-0331
PO BOX 332, CHARLOTTESVILLE, VA 22902-0332
PO BOX 333, CHARLOTTESVILLE, VA 22902-0333
PO BOX 334, CHARLOTTESVILLE, VA 22902-0334
PO BOX 335, CHARLOTTESVILLE, VA 22902-0335
PO BOX 336, CHARLOTTESVILLE, VA 22902-0336
PO BOX 337, CHARLOTTESVILLE, VA 22902-0337
PO BOX 338, CHARLOTTESVILLE, VA 22902-0338
PO BOX 339, CHARLOTTESVILLE, VA 22902-0339
PO BOX 340, CHARLOTTESVILLE, VA 22902-0340
PO BOX 341, CHARLOTTESVILLE, VA 22902-0341
PO BOX 342, CHARLOTTESVILLE, VA 22902-0342
PO BOX 343, CHARLOTTESVILLE, VA 22902-0343
PO BOX 344, CHARLOTTESVILLE, VA 22902-0344
PO BOX 345, CHARLOTTESVILLE, VA 22902-0345
PO BOX 346, CHARLOTTESVILLE, VA 22902-0346
PO BOX 347, CHARLOTTESVILLE, VA 22902-0347
PO BOX 348, CHARLOTTESVILLE, VA 22902-0348
PO BOX 349, CHARLOTTESVILLE, VA 22902-0349
PO BOX 350, CHARLOTTESVILLE, VA 22902-0350
PO BOX 351, CHARLOTTESVILLE, VA 22902-0351
PO BOX 352, CHARLOTTESVILLE, VA 22902-0352
PO BOX 353, CHARLOTTESVILLE, VA 22902-0353
PO BOX 354, CHARLOTTESVILLE, VA 22902-0354
PO BOX 355, CHARLOTTESVILLE, VA 22902-0355
PO BOX 356, CHARLOTTESVILLE, VA 22902-0356
PO BOX 357, CHARLOTTESVILLE, VA 22902-0357
PO BOX 358, CHARLOTTESVILLE, VA 22902-0358
PO BOX 359, CHARLOTTESVILLE, VA 22902-0359
PO BOX 360, CHARLOTTESVILLE, VA 22902-0360
PO BOX 361, CHARLOTTESVILLE, VA 22902-0361
PO BOX 362, CHARLOTTESVILLE, VA 22902-0362
PO BOX 363, CHARLOTTESVILLE, VA 22902-0363
PO BOX 364, CHARLOTTESVILLE, VA 22902-0364
PO BOX 365, CHARLOTTESVILLE, VA 22902-0365
PO BOX 366, CHARLOTTESVILLE, VA 22902-0366
PO BOX 367, CHARLOTTESVILLE, VA 22902-0367
PO BOX 368, CHARLOTTESVILLE, VA 22902-0368
PO BOX 369, CHARLOTTESVILLE, VA 22902-0369
PO BOX 370, CHARLOTTESVILLE, VA 22902-0370
PO BOX 371, CHARLOTTESVILLE, VA 22902-0371
PO BOX 372, CHARLOTTESVILLE, VA 22902-0372
PO BOX 373, CHARLOTTESVILLE, VA 22902-0373
PO BOX 374, CHARLOTTESVILLE, VA 22902-0374
PO BOX 375, CHARLOTTESVILLE, VA 22902-0375
PO BOX 376, CHARLOTTESVILLE, VA 22902-0376
PO BOX 377, CHARLOTTESVILLE, VA 22902-0377
PO BOX 378, CHARLOTTESVILLE, VA 22902-0378
PO BOX 379, CHARLOTTESVILLE, VA 22902-0379
PO BOX 380, CHARLOTTESVILLE, VA 22902-0380
PO BOX 381, CHARLOTTESVILLE, VA 22902-0381
PO BOX 382, CHARLOTTESVILLE, VA 22902-0382
PO BOX 383, CHARLOTTESVILLE, VA 22902-0383
PO BOX 384, CHARLOTTESVILLE, VA 22902-0384
PO BOX 385, CHARLOTTESVILLE, VA 22902-0385
PO BOX 386, CHARLOTTESVILLE, VA 22902-0386
PO BOX 387, CHARLOTTESVILLE, VA 22902-0387
PO BOX 388, CHARLOTTESVILLE, VA 22902-0388
PO BOX 389, CHARLOTTESVILLE, VA 22902-0389
PO BOX 390, CHARLOTTESVILLE, VA 22902-0390
PO BOX 391, CHARLOTTESVILLE, VA 22902-0391
PO BOX 392, CHARLOTTESVILLE, VA 22902-0392
PO BOX 393, CHARLOTTESVILLE, VA 22902-0393
PO BOX 394, CHARLOTTESVILLE, VA 22902-0394
PO BOX 395, CHARLOTTESVILLE, VA 22902-0395
PO BOX 396, CHARLOTTESVILLE, VA 22902-0396
PO BOX 397, CHARLOTTESVILLE, VA 22902-0397
PO BOX 398, CHARLOTTESVILLE, VA 22902-0398
PO BOX 399, CHARLOTTESVILLE, VA 22902-0399
PO BOX 400, CHARLOTTESVILLE, VA 22902-0400
PO BOX 401, CHARLOTTESVILLE, VA 22902-0401
PO BOX 402, CHARLOTTESVILLE, VA 22902-0402
PO BOX 403, CHARLOTTESVILLE, VA 22902-0403
PO BOX 404, CHARLOTTESVILLE, VA 22902-0404
PO BOX 405, CHARLOTTESVILLE, VA 22902-0405
PO BOX 406, CHARLOTTESVILLE, VA 22902-0406
PO BOX 407, CHARLOTTESVILLE, VA 22902-0407
PO BOX 408, CHARLOTTESVILLE, VA 22902-0408
PO BOX 409, CHARLOTTESVILLE, VA 22902-0409
PO BOX 410, CHARLOTTESVILLE, VA 22902-0410
PO BOX 411, CHARLOTTESVILLE, VA 22902-0411
PO BOX 412, CHARLOTTESVILLE, VA 22902-0412
PO BOX 413, CHARLOTTESVILLE, VA 22902-0413
PO BOX 414, CHARLOTTESVILLE, VA 22902-0414
PO BOX 415, CHARLOTTESVILLE, VA 22902-0415
PO BOX 416, CHARLOTTESVILLE, VA 22902-0416
PO BOX 417, CHARLOTTESVILLE, VA 22902-0417
PO BOX 418, CHARLOTTESVILLE, VA 22902-0418
PO BOX 419, CHARLOTTESVILLE, VA 22902-0419
PO BOX 420, CHARLOTTESVILLE, VA 22902-0420
PO BOX 421, CHARLOTTESVILLE, VA 22902-0421
PO BOX 422, CHARLOTTESVILLE, VA 22902-0422
PO BOX 423, CHARLOTTESVILLE, VA 22902-0423
PO BOX 424, CHARLOTTESVILLE, VA 22902-0424
PO BOX 425, CHARLOTTESVILLE, VA 22902-0425
PO BOX 426, CHARLOTTESVILLE, VA 22902-0426
PO BOX 427, CHARLOTTESVILLE, VA 22902-0427
PO BOX 428, CHARLOTTESVILLE, VA 22902-0428
PO BOX 429, CHARLOTTESVILLE, VA 22902-0429
PO BOX 430, CHARLOTTESVILLE, VA 22902-0430
PO BOX 431, CHARLOTTESVILLE, VA 22902-0431
PO BOX 432, CHARLOTTESVILLE, VA 22902-0432
PO BOX 433, CHARLOTTESVILLE, VA 22902-0433
PO BOX 434, CHARLOTTESVILLE, VA 22902-0434
PO BOX 435, CHARLOTTESVILLE, VA 22902-0435
PO BOX 436, CHARLOTTESVILLE, VA 22902-0436
PO BOX 437, CHARLOTTESVILLE, VA 22902-0437
PO BOX 438, CHARLOTTESVILLE, VA 22902-0438
PO BOX 439, CHARLOTTESVILLE, VA 22902-0439
PO BOX 440, CHARLOTTESVILLE, VA 22902-0440
PO BOX 441, CHARLOTTESVILLE, VA 22902-0441
PO BOX 442, CHARLOTTESVILLE, VA 22902-0442
PO BOX 443, CHARLOTTESVILLE, VA 22902-0443
PO BOX 444, CHARLOTTESVILLE, VA 22902-0444
PO BOX 445, CHARLOTTESVILLE, VA 22902-0445
PO BOX 446, CHARLOTTESVILLE, VA 22902-0446
PO BOX 447, CHARLOTTESVILLE, VA 22902-0447
PO BOX 448, CHARLOTTESVILLE, VA 22902-0448
PO BOX 449, CHARLOTTESVILLE, VA 22902-0449
PO BOX 450, CHARLOTTESVILLE, VA 22902-0450
PO BOX 451, CHARLOTTESVILLE, VA 22902-0451
PO BOX 452, CHARLOTTESVILLE, VA 22902-0452
PO BOX 453, CHARLOTTESVILLE, VA 22902-0453
PO BOX 454, CHARLOTTESVILLE, VA 22902-0454
PO BOX 455, CHARLOTTESVILLE, VA 22902-0455
PO BOX 456, CHARLOTTESVILLE, VA 22902-0456
PO BOX 457, CHARLOTTESVILLE, VA 22902-0457
PO BOX 458, CHARLOTTESVILLE, VA 22902-0458
PO BOX 459, CHARLOTTESVILLE, VA 22902-0459
PO BOX 460, CHARLOTTESVILLE, VA 22902-0460
PO BOX 461, CHARLOTTESVILLE, VA 22902-0461
PO BOX 462, CHARLOTTESVILLE, VA 22902-0462
PO BOX 463, CHARLOTTESVILLE, VA 22902-0463
PO BOX 464, CHARLOTTESVILLE, VA 22902-0464
PO BOX 465, CHARLOTTESVILLE, VA 22902-0465
PO BOX 466, CHARLOTTESVILLE, VA 22902-0466
PO BOX 467, CHARLOTTESVILLE, VA 22902-0467
PO BOX 468, CHARLOTTESVILLE, VA 22902-0468
PO BOX 469, CHARLOTTESVILLE, VA 22902-0469
PO BOX 470, CHARLOTTESVILLE, VA 22902-0470
PO BOX 471, CHARLOTTESVILLE, VA 22902-0471
PO BOX 472, CHARLOTTESVILLE, VA 22902-0472
PO BOX 473, CHARLOTTESVILLE, VA 22902-0473
PO BOX 474, CHARLOTTESVILLE, VA 22902-0474
PO BOX 475, CHARLOTTESVILLE, VA 22902-0475
PO BOX 476, CHARLOTTESVILLE, VA 22902-0476
PO BOX 477, CHARLOTTESVILLE, VA 22902-0477
PO BOX 478, CHARLOTTESVILLE, VA 22902-0478
PO BOX 479, CHARLOTTESVILLE, VA 22902-0479
PO BOX 480, CHARLOTTESVILLE, VA 22902-0480
PO BOX 481, CHARLOTTESVILLE, VA 22902-0481
PO BOX 482, CHARLOTTESVILLE, VA 22902-0482
PO BOX 483, CHARLOTTESVILLE, VA 22902-0483
PO BOX 484, CHARLOTTESVILLE, VA 22902-0484
PO BOX 485, CHARLOTTESVILLE, VA 22902-0485
PO BOX 486, CHARLOTTESVILLE, VA 22902-0486
PO BOX 487, CHARLOTTESVILLE, VA 22902-0487
PO BOX 488, CHARLOTTESVILLE, VA 22902-0488
PO BOX 489, CHARLOTTESVILLE, VA 22902-0489
PO BOX 490, CHARLOTTESVILLE, VA 22902-0490
PO BOX 491, CHARLOTTESVILLE, VA 22902-0491
PO BOX 492, CHARLOTTESVILLE, VA 22902-0492
PO BOX 493, CHARLOTTESVILLE, VA 22902-0493
PO BOX 494, CHARLOTTESVILLE, VA 22902-0494
PO BOX 495, CHARLOTTESVILLE, VA 22902-0495
PO BOX 496, CHARLOTTESVILLE, VA 22902-0496
PO BOX 497, CHARLOTTESVILLE, VA 22902-0497
PO BOX 498, CHARLOTTESVILLE, VA 22902-0498
PO BOX 499, CHARLOTTESVILLE, VA 22902-0499
PO BOX 500, CHARLOTTESVILLE, VA 22902-0500
PO BOX 501, CHARLOTTESVILLE, VA 22902-0501
PO BOX 502, CHARLOTTESVILLE, VA 22902-0502
PO BOX 503, CHARLOTTESVILLE, VA 22902-0503
PO BOX 504, CHARLOTTESVILLE, VA 22902-0504
PO BOX 505, CHARLOTTESVILLE, VA 22902-0505
PO BOX 506, CHARLOTTESVILLE, VA 22902-0506
PO BOX 507, CHARLOTTESVILLE, VA 22902-0507
PO BOX 508, CHARLOTTESVILLE, VA 22902-0508
PO BOX 509, CHARLOTTESVILLE, VA 22902-0509
PO BOX 510, CHARLOTTESVILLE, VA 22902-0510
PO BOX 511, CHARLOTTESVILLE, VA 22902-0511
PO BOX 512, CHARLOTTESVILLE, VA 22902-0512
PO BOX 513, CHARLOTTESVILLE, VA 22902-0513
PO BOX 514, CHARLOTTESVILLE, VA 22902-0514
PO BOX 515, CHARLOTTESVILLE, VA 22902-0515
PO BOX 516, CHARLOTTESVILLE, VA 22902-0516
PO BOX 517, CHARLOTTESVILLE, VA 22902-0517
PO BOX 518, CHARLOTTESVILLE, VA 22902-0518
PO BOX 519, CHARLOTTESVILLE, VA 22902-0519
PO BOX 520, CHARLOTTESVILLE, VA 22902-0520
PO BOX 521, CHARLOTTESVILLE, VA 22902-0521
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