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, MIDLAND, PA 15059-0321
PO BOX 322, MIDLAND, PA 15059-0322
PO BOX 323, MIDLAND, PA 15059-0323
PO BOX 324, MIDLAND, PA 15059-0324
PO BOX 325, MIDLAND, PA 15059-0325
PO BOX 326, MIDLAND, PA 15059-0326
PO BOX 327, MIDLAND, PA 15059-0327
PO BOX 328, MIDLAND, PA 15059-0328
PO BOX 329, MIDLAND, PA 15059-0329
PO BOX 330, MIDLAND, PA 15059-0330
PO BOX 331, MIDLAND, PA 15059-0331
PO BOX 332, MIDLAND, PA 15059-0332
PO BOX 333, MIDLAND, PA 15059-0333
PO BOX 334, MIDLAND, PA 15059-0334
PO BOX 335, MIDLAND, PA 15059-0335
PO BOX 336, MIDLAND, PA 15059-0336
PO BOX 337, MIDLAND, PA 15059-0337
PO BOX 338, MIDLAND, PA 15059-0338
PO BOX 339, MIDLAND, PA 15059-0339
PO BOX 340, MIDLAND, PA 15059-0340
PO BOX 341, MIDLAND, PA 15059-0341
PO BOX 342, MIDLAND, PA 15059-0342
PO BOX 343, MIDLAND, PA 15059-0343
PO BOX 344, MIDLAND, PA 15059-0344
PO BOX 345, MIDLAND, PA 15059-0345
PO BOX 346, MIDLAND, PA 15059-0346
PO BOX 347, MIDLAND, PA 15059-0347
PO BOX 348, MIDLAND, PA 15059-0348
PO BOX 349, MIDLAND, PA 15059-0349
PO BOX 350, MIDLAND, PA 15059-0350
PO BOX 351, MIDLAND, PA 15059-0351
PO BOX 352, MIDLAND, PA 15059-0352
PO BOX 353, MIDLAND, PA 15059-0353
PO BOX 354, MIDLAND, PA 15059-0354
PO BOX 355, MIDLAND, PA 15059-0355
PO BOX 356, MIDLAND, PA 15059-0356
PO BOX 357, MIDLAND, PA 15059-0357
PO BOX 358, MIDLAND, PA 15059-0358
PO BOX 359, MIDLAND, PA 15059-0359
PO BOX 360, MIDLAND, PA 15059-0360
PO BOX 361, MIDLAND, PA 15059-0361
PO BOX 362, MIDLAND, PA 15059-0362
PO BOX 363, MIDLAND, PA 15059-0363
PO BOX 364, MIDLAND, PA 15059-0364
PO BOX 365, MIDLAND, PA 15059-0365
PO BOX 366, MIDLAND, PA 15059-0366
PO BOX 367, MIDLAND, PA 15059-0367
PO BOX 368, MIDLAND, PA 15059-0368
PO BOX 369, MIDLAND, PA 15059-0369
PO BOX 370, MIDLAND, PA 15059-0370
PO BOX 371, MIDLAND, PA 15059-0371
PO BOX 372, MIDLAND, PA 15059-0372
PO BOX 373, MIDLAND, PA 15059-0373
PO BOX 374, MIDLAND, PA 15059-0374
PO BOX 375, MIDLAND, PA 15059-0375
PO BOX 376, MIDLAND, PA 15059-0376
PO BOX 377, MIDLAND, PA 15059-0377
PO BOX 378, MIDLAND, PA 15059-0378
PO BOX 379, MIDLAND, PA 15059-0379
PO BOX 380, MIDLAND, PA 15059-0380
PO BOX 381, MIDLAND, PA 15059-0381
PO BOX 382, MIDLAND, PA 15059-0382
PO BOX 383, MIDLAND, PA 15059-0383
PO BOX 384, MIDLAND, PA 15059-0384
PO BOX 385, MIDLAND, PA 15059-0385
PO BOX 386, MIDLAND, PA 15059-0386
PO BOX 387, MIDLAND, PA 15059-0387
PO BOX 388, MIDLAND, PA 15059-0388
PO BOX 389, MIDLAND, PA 15059-0389
PO BOX 390, MIDLAND, PA 15059-0390
PO BOX 391, MIDLAND, PA 15059-0391
PO BOX 392, MIDLAND, PA 15059-0392
PO BOX 393, MIDLAND, PA 15059-0393
PO BOX 394, MIDLAND, PA 15059-0394
PO BOX 395, MIDLAND, PA 15059-0395
PO BOX 396, MIDLAND, PA 15059-0396
PO BOX 397, MIDLAND, PA 15059-0397
PO BOX 398, MIDLAND, PA 15059-0398
PO BOX 399, MIDLAND, PA 15059-0399
PO BOX 400, MIDLAND, PA 15059-0400
PO BOX 401, MIDLAND, PA 15059-0401
PO BOX 402, MIDLAND, PA 15059-0402
PO BOX 403, MIDLAND, PA 15059-0403
PO BOX 404, MIDLAND, PA 15059-0404
PO BOX 405, MIDLAND, PA 15059-0405
PO BOX 406, MIDLAND, PA 15059-0406
PO BOX 407, MIDLAND, PA 15059-0407
PO BOX 408, MIDLAND, PA 15059-0408
PO BOX 409, MIDLAND, PA 15059-0409
PO BOX 410, MIDLAND, PA 15059-0410
PO BOX 411, MIDLAND, PA 15059-0411
PO BOX 412, MIDLAND, PA 15059-0412
PO BOX 413, MIDLAND, PA 15059-0413
PO BOX 414, MIDLAND, PA 15059-0414
PO BOX 415, MIDLAND, PA 15059-0415
PO BOX 416, MIDLAND, PA 15059-0416
PO BOX 417, MIDLAND, PA 15059-0417
PO BOX 418, MIDLAND, PA 15059-0418
PO BOX 419, MIDLAND, PA 15059-0419
PO BOX 420, MIDLAND, PA 15059-0420
PO BOX 421, MIDLAND, PA 15059-0421
PO BOX 422, MIDLAND, PA 15059-0422
PO BOX 423, MIDLAND, PA 15059-0423
PO BOX 424, MIDLAND, PA 15059-0424
PO BOX 425, MIDLAND, PA 15059-0425
PO BOX 426, MIDLAND, PA 15059-0426
PO BOX 427, MIDLAND, PA 15059-0427
PO BOX 428, MIDLAND, PA 15059-0428
PO BOX 429, MIDLAND, PA 15059-0429
PO BOX 430, MIDLAND, PA 15059-0430
PO BOX 431, MIDLAND, PA 15059-0431
PO BOX 432, MIDLAND, PA 15059-0432
PO BOX 433, MIDLAND, PA 15059-0433
PO BOX 434, MIDLAND, PA 15059-0434
PO BOX 435, MIDLAND, PA 15059-0435
PO BOX 436, MIDLAND, PA 15059-0436
PO BOX 437, MIDLAND, PA 15059-0437
PO BOX 438, MIDLAND, PA 15059-0438
PO BOX 439, MIDLAND, PA 15059-0439
PO BOX 440, MIDLAND, PA 15059-0440
PO BOX 441, MIDLAND, PA 15059-0441
PO BOX 442, MIDLAND, PA 15059-0442
PO BOX 443, MIDLAND, PA 15059-0443
PO BOX 444, MIDLAND, PA 15059-0444
PO BOX 445, MIDLAND, PA 15059-0445
PO BOX 446, MIDLAND, PA 15059-0446
PO BOX 447, MIDLAND, PA 15059-0447
PO BOX 448, MIDLAND, PA 15059-0448
PO BOX 449, MIDLAND, PA 15059-0449
PO BOX 450, MIDLAND, PA 15059-0450
PO BOX 451, MIDLAND, PA 15059-0451
PO BOX 452, MIDLAND, PA 15059-0452
PO BOX 453, MIDLAND, PA 15059-0453
PO BOX 454, MIDLAND, PA 15059-0454
PO BOX 455, MIDLAND, PA 15059-0455
PO BOX 456, MIDLAND, PA 15059-0456
PO BOX 457, MIDLAND, PA 15059-0457
PO BOX 458, MIDLAND, PA 15059-0458
PO BOX 459, MIDLAND, PA 15059-0459
PO BOX 460, MIDLAND, PA 15059-0460
PO BOX 461, MIDLAND, PA 15059-0461
PO BOX 462, MIDLAND, PA 15059-0462
PO BOX 463, MIDLAND, PA 15059-0463
PO BOX 464, MIDLAND, PA 15059-0464
PO BOX 465, MIDLAND, PA 15059-0465
PO BOX 466, MIDLAND, PA 15059-0466
PO BOX 467, MIDLAND, PA 15059-0467
PO BOX 468, MIDLAND, PA 15059-0468
PO BOX 469, MIDLAND, PA 15059-0469
PO BOX 470, MIDLAND, PA 15059-0470
PO BOX 471, MIDLAND, PA 15059-0471
PO BOX 472, MIDLAND, PA 15059-0472
PO BOX 473, MIDLAND, PA 15059-0473
PO BOX 474, MIDLAND, PA 15059-0474
PO BOX 475, MIDLAND, PA 15059-0475
PO BOX 476, MIDLAND, PA 15059-0476
PO BOX 477, MIDLAND, PA 15059-0477
PO BOX 478, MIDLAND, PA 15059-0478
PO BOX 479, MIDLAND, PA 15059-0479
PO BOX 480, MIDLAND, PA 15059-0480
PO BOX 481, MIDLAND, PA 15059-0481
PO BOX 482, MIDLAND, PA 15059-0482
PO BOX 483, MIDLAND, PA 15059-0483
PO BOX 484, MIDLAND, PA 15059-0484
PO BOX 485, MIDLAND, PA 15059-0485
PO BOX 486, MIDLAND, PA 15059-0486
PO BOX 487, MIDLAND, PA 15059-0487
PO BOX 488, MIDLAND, PA 15059-0488
PO BOX 489, MIDLAND, PA 15059-0489
PO BOX 490, MIDLAND, PA 15059-0490
PO BOX 491, MIDLAND, PA 15059-0491
PO BOX 492, MIDLAND, PA 15059-0492
PO BOX 493, MIDLAND, PA 15059-0493
PO BOX 494, MIDLAND, PA 15059-0494
PO BOX 495, MIDLAND, PA 15059-0495
PO BOX 496, MIDLAND, PA 15059-0496
PO BOX 497, MIDLAND, PA 15059-0497
PO BOX 498, MIDLAND, PA 15059-0498
PO BOX 499, MIDLAND, PA 15059-0499
PO BOX 500, MIDLAND, PA 15059-0500
PO BOX 501, MIDLAND, PA 15059-0501
PO BOX 502, MIDLAND, PA 15059-0502
PO BOX 503, MIDLAND, PA 15059-0503
PO BOX 504, MIDLAND, PA 15059-0504
PO BOX 505, MIDLAND, PA 15059-0505
PO BOX 506, MIDLAND, PA 15059-0506
PO BOX 507, MIDLAND, PA 15059-0507
PO BOX 508, MIDLAND, PA 15059-0508
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