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, FREDERICKSBURG, TX 78624-0321
PO BOX 322, FREDERICKSBURG, TX 78624-0322
PO BOX 323, FREDERICKSBURG, TX 78624-0323
PO BOX 324, FREDERICKSBURG, TX 78624-0324
PO BOX 325, FREDERICKSBURG, TX 78624-0325
PO BOX 326, FREDERICKSBURG, TX 78624-0326
PO BOX 327, FREDERICKSBURG, TX 78624-0327
PO BOX 328, FREDERICKSBURG, TX 78624-0328
PO BOX 329, FREDERICKSBURG, TX 78624-0329
PO BOX 330, FREDERICKSBURG, TX 78624-0330
PO BOX 331, FREDERICKSBURG, TX 78624-0331
PO BOX 332, FREDERICKSBURG, TX 78624-0332
PO BOX 333, FREDERICKSBURG, TX 78624-0333
PO BOX 334, FREDERICKSBURG, TX 78624-0334
PO BOX 335, FREDERICKSBURG, TX 78624-0335
PO BOX 336, FREDERICKSBURG, TX 78624-0336
PO BOX 337, FREDERICKSBURG, TX 78624-0337
PO BOX 338, FREDERICKSBURG, TX 78624-0338
PO BOX 339, FREDERICKSBURG, TX 78624-0339
PO BOX 340, FREDERICKSBURG, TX 78624-0340
PO BOX 341, FREDERICKSBURG, TX 78624-0341
PO BOX 342, FREDERICKSBURG, TX 78624-0342
PO BOX 343, FREDERICKSBURG, TX 78624-0343
PO BOX 344, FREDERICKSBURG, TX 78624-0344
PO BOX 345, FREDERICKSBURG, TX 78624-0345
PO BOX 346, FREDERICKSBURG, TX 78624-0346
PO BOX 347, FREDERICKSBURG, TX 78624-0347
PO BOX 348, FREDERICKSBURG, TX 78624-0348
PO BOX 349, FREDERICKSBURG, TX 78624-0349
PO BOX 350, FREDERICKSBURG, TX 78624-0350
PO BOX 351, FREDERICKSBURG, TX 78624-0351
PO BOX 352, FREDERICKSBURG, TX 78624-0352
PO BOX 353, FREDERICKSBURG, TX 78624-0353
PO BOX 354, FREDERICKSBURG, TX 78624-0354
PO BOX 355, FREDERICKSBURG, TX 78624-0355
PO BOX 356, FREDERICKSBURG, TX 78624-0356
PO BOX 357, FREDERICKSBURG, TX 78624-0357
PO BOX 358, FREDERICKSBURG, TX 78624-0358
PO BOX 359, FREDERICKSBURG, TX 78624-0359
PO BOX 360, FREDERICKSBURG, TX 78624-0360
PO BOX 361, FREDERICKSBURG, TX 78624-0361
PO BOX 362, FREDERICKSBURG, TX 78624-0362
PO BOX 363, FREDERICKSBURG, TX 78624-0363
PO BOX 364, FREDERICKSBURG, TX 78624-0364
PO BOX 365, FREDERICKSBURG, TX 78624-0365
PO BOX 366, FREDERICKSBURG, TX 78624-0366
PO BOX 367, FREDERICKSBURG, TX 78624-0367
PO BOX 368, FREDERICKSBURG, TX 78624-0368
PO BOX 369, FREDERICKSBURG, TX 78624-0369
PO BOX 370, FREDERICKSBURG, TX 78624-0370
PO BOX 371, FREDERICKSBURG, TX 78624-0371
PO BOX 372, FREDERICKSBURG, TX 78624-0372
PO BOX 373, FREDERICKSBURG, TX 78624-0373
PO BOX 374, FREDERICKSBURG, TX 78624-0374
PO BOX 375, FREDERICKSBURG, TX 78624-0375
PO BOX 376, FREDERICKSBURG, TX 78624-0376
PO BOX 377, FREDERICKSBURG, TX 78624-0377
PO BOX 378, FREDERICKSBURG, TX 78624-0378
PO BOX 379, FREDERICKSBURG, TX 78624-0379
PO BOX 380, FREDERICKSBURG, TX 78624-0380
PO BOX 381, FREDERICKSBURG, TX 78624-0381
PO BOX 382, FREDERICKSBURG, TX 78624-0382
PO BOX 383, FREDERICKSBURG, TX 78624-0383
PO BOX 384, FREDERICKSBURG, TX 78624-0384
PO BOX 385, FREDERICKSBURG, TX 78624-0385
PO BOX 386, FREDERICKSBURG, TX 78624-0386
PO BOX 387, FREDERICKSBURG, TX 78624-0387
PO BOX 388, FREDERICKSBURG, TX 78624-0388
PO BOX 389, FREDERICKSBURG, TX 78624-0389
PO BOX 390, FREDERICKSBURG, TX 78624-0390
PO BOX 391, FREDERICKSBURG, TX 78624-0391
PO BOX 392, FREDERICKSBURG, TX 78624-0392
PO BOX 393, FREDERICKSBURG, TX 78624-0393
PO BOX 394, FREDERICKSBURG, TX 78624-0394
PO BOX 395, FREDERICKSBURG, TX 78624-0395
PO BOX 396, FREDERICKSBURG, TX 78624-0396
PO BOX 397, FREDERICKSBURG, TX 78624-0397
PO BOX 398, FREDERICKSBURG, TX 78624-0398
PO BOX 399, FREDERICKSBURG, TX 78624-0399
PO BOX 400, FREDERICKSBURG, TX 78624-0400
PO BOX 401, FREDERICKSBURG, TX 78624-0401
PO BOX 402, FREDERICKSBURG, TX 78624-0402
PO BOX 403, FREDERICKSBURG, TX 78624-0403
PO BOX 404, FREDERICKSBURG, TX 78624-0404
PO BOX 405, FREDERICKSBURG, TX 78624-0405
PO BOX 406, FREDERICKSBURG, TX 78624-0406
PO BOX 407, FREDERICKSBURG, TX 78624-0407
PO BOX 408, FREDERICKSBURG, TX 78624-0408
PO BOX 409, FREDERICKSBURG, TX 78624-0409
PO BOX 410, FREDERICKSBURG, TX 78624-0410
PO BOX 411, FREDERICKSBURG, TX 78624-0411
PO BOX 412, FREDERICKSBURG, TX 78624-0412
PO BOX 413, FREDERICKSBURG, TX 78624-0413
PO BOX 414, FREDERICKSBURG, TX 78624-0414
PO BOX 415, FREDERICKSBURG, TX 78624-0415
PO BOX 416, FREDERICKSBURG, TX 78624-0416
PO BOX 417, FREDERICKSBURG, TX 78624-0417
PO BOX 418, FREDERICKSBURG, TX 78624-0418
PO BOX 419, FREDERICKSBURG, TX 78624-0419
PO BOX 420, FREDERICKSBURG, TX 78624-0420
PO BOX 421, FREDERICKSBURG, TX 78624-0421
PO BOX 422, FREDERICKSBURG, TX 78624-0422
PO BOX 423, FREDERICKSBURG, TX 78624-0423
PO BOX 424, FREDERICKSBURG, TX 78624-0424
PO BOX 425, FREDERICKSBURG, TX 78624-0425
PO BOX 426, FREDERICKSBURG, TX 78624-0426
PO BOX 427, FREDERICKSBURG, TX 78624-0427
PO BOX 428, FREDERICKSBURG, TX 78624-0428
PO BOX 429, FREDERICKSBURG, TX 78624-0429
PO BOX 430, FREDERICKSBURG, TX 78624-0430
PO BOX 431, FREDERICKSBURG, TX 78624-0431
PO BOX 432, FREDERICKSBURG, TX 78624-0432
PO BOX 433, FREDERICKSBURG, TX 78624-0433
PO BOX 434, FREDERICKSBURG, TX 78624-0434
PO BOX 435, FREDERICKSBURG, TX 78624-0435
PO BOX 436, FREDERICKSBURG, TX 78624-0436
PO BOX 437, FREDERICKSBURG, TX 78624-0437
PO BOX 438, FREDERICKSBURG, TX 78624-0438
PO BOX 439, FREDERICKSBURG, TX 78624-0439
PO BOX 440, FREDERICKSBURG, TX 78624-0440
PO BOX 441, FREDERICKSBURG, TX 78624-0441
PO BOX 442, FREDERICKSBURG, TX 78624-0442
PO BOX 443, FREDERICKSBURG, TX 78624-0443
PO BOX 444, FREDERICKSBURG, TX 78624-0444
PO BOX 445, FREDERICKSBURG, TX 78624-0445
PO BOX 446, FREDERICKSBURG, TX 78624-0446
PO BOX 447, FREDERICKSBURG, TX 78624-0447
PO BOX 448, FREDERICKSBURG, TX 78624-0448
PO BOX 449, FREDERICKSBURG, TX 78624-0449
PO BOX 450, FREDERICKSBURG, TX 78624-0450
PO BOX 451, FREDERICKSBURG, TX 78624-0451
PO BOX 452, FREDERICKSBURG, TX 78624-0452
PO BOX 453, FREDERICKSBURG, TX 78624-0453
PO BOX 454, FREDERICKSBURG, TX 78624-0454
PO BOX 455, FREDERICKSBURG, TX 78624-0455
PO BOX 456, FREDERICKSBURG, TX 78624-0456
PO BOX 457, FREDERICKSBURG, TX 78624-0457
PO BOX 458, FREDERICKSBURG, TX 78624-0458
PO BOX 459, FREDERICKSBURG, TX 78624-0459
PO BOX 460, FREDERICKSBURG, TX 78624-0460
PO BOX 461, FREDERICKSBURG, TX 78624-0461
PO BOX 462, FREDERICKSBURG, TX 78624-0462
PO BOX 463, FREDERICKSBURG, TX 78624-0463
PO BOX 464, FREDERICKSBURG, TX 78624-0464
PO BOX 465, FREDERICKSBURG, TX 78624-0465
PO BOX 466, FREDERICKSBURG, TX 78624-0466
PO BOX 467, FREDERICKSBURG, TX 78624-0467
PO BOX 468, FREDERICKSBURG, TX 78624-0468
PO BOX 469, FREDERICKSBURG, TX 78624-0469
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