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 341, SOUTH HEIGHTS, PA 15081-0341
PO BOX 342, SOUTH HEIGHTS, PA 15081-0342
PO BOX 343, SOUTH HEIGHTS, PA 15081-0343
PO BOX 344, SOUTH HEIGHTS, PA 15081-0344
PO BOX 345, SOUTH HEIGHTS, PA 15081-0345
PO BOX 346, SOUTH HEIGHTS, PA 15081-0346
PO BOX 347, SOUTH HEIGHTS, PA 15081-0347
PO BOX 348, SOUTH HEIGHTS, PA 15081-0348
PO BOX 349, SOUTH HEIGHTS, PA 15081-0349
PO BOX 350, SOUTH HEIGHTS, PA 15081-0350
PO BOX 351, SOUTH HEIGHTS, PA 15081-0351
PO BOX 352, SOUTH HEIGHTS, PA 15081-0352
PO BOX 353, SOUTH HEIGHTS, PA 15081-0353
PO BOX 354, SOUTH HEIGHTS, PA 15081-0354
PO BOX 355, SOUTH HEIGHTS, PA 15081-0355
PO BOX 356, SOUTH HEIGHTS, PA 15081-0356
PO BOX 357, SOUTH HEIGHTS, PA 15081-0357
PO BOX 358, SOUTH HEIGHTS, PA 15081-0358
PO BOX 359, SOUTH HEIGHTS, PA 15081-0359
PO BOX 360, SOUTH HEIGHTS, PA 15081-0360
PO BOX 361, SOUTH HEIGHTS, PA 15081-0361
PO BOX 362, SOUTH HEIGHTS, PA 15081-0362
PO BOX 363, SOUTH HEIGHTS, PA 15081-0363
PO BOX 364, SOUTH HEIGHTS, PA 15081-0364
PO BOX 365, SOUTH HEIGHTS, PA 15081-0365
PO BOX 366, SOUTH HEIGHTS, PA 15081-0366
PO BOX 367, SOUTH HEIGHTS, PA 15081-0367
PO BOX 368, SOUTH HEIGHTS, PA 15081-0368
PO BOX 369, SOUTH HEIGHTS, PA 15081-0369
PO BOX 370, SOUTH HEIGHTS, PA 15081-0370
PO BOX 371, SOUTH HEIGHTS, PA 15081-0371
PO BOX 372, SOUTH HEIGHTS, PA 15081-0372
PO BOX 373, SOUTH HEIGHTS, PA 15081-0373
PO BOX 374, SOUTH HEIGHTS, PA 15081-0374
PO BOX 375, SOUTH HEIGHTS, PA 15081-0375
PO BOX 376, SOUTH HEIGHTS, PA 15081-0376
PO BOX 377, SOUTH HEIGHTS, PA 15081-0377
PO BOX 378, SOUTH HEIGHTS, PA 15081-0378
PO BOX 379, SOUTH HEIGHTS, PA 15081-0379
PO BOX 380, SOUTH HEIGHTS, PA 15081-0380
PO BOX 381, SOUTH HEIGHTS, PA 15081-0381
PO BOX 382, SOUTH HEIGHTS, PA 15081-0382
PO BOX 383, SOUTH HEIGHTS, PA 15081-0383
PO BOX 384, SOUTH HEIGHTS, PA 15081-0384
PO BOX 385, SOUTH HEIGHTS, PA 15081-0385
PO BOX 386, SOUTH HEIGHTS, PA 15081-0386
PO BOX 387, SOUTH HEIGHTS, PA 15081-0387
PO BOX 388, SOUTH HEIGHTS, PA 15081-0388
PO BOX 389, SOUTH HEIGHTS, PA 15081-0389
PO BOX 390, SOUTH HEIGHTS, PA 15081-0390
PO BOX 391, SOUTH HEIGHTS, PA 15081-0391
PO BOX 392, SOUTH HEIGHTS, PA 15081-0392
PO BOX 393, SOUTH HEIGHTS, PA 15081-0393
PO BOX 394, SOUTH HEIGHTS, PA 15081-0394
PO BOX 395, SOUTH HEIGHTS, PA 15081-0395
PO BOX 396, SOUTH HEIGHTS, PA 15081-0396
PO BOX 397, SOUTH HEIGHTS, PA 15081-0397
PO BOX 398, SOUTH HEIGHTS, PA 15081-0398
PO BOX 399, SOUTH HEIGHTS, PA 15081-0399
PO BOX 400, SOUTH HEIGHTS, PA 15081-0400
PO BOX 401, SOUTH HEIGHTS, PA 15081-0401
PO BOX 402, SOUTH HEIGHTS, PA 15081-0402
PO BOX 403, SOUTH HEIGHTS, PA 15081-0403
PO BOX 404, SOUTH HEIGHTS, PA 15081-0404
PO BOX 405, SOUTH HEIGHTS, PA 15081-0405
PO BOX 406, SOUTH HEIGHTS, PA 15081-0406
PO BOX 407, SOUTH HEIGHTS, PA 15081-0407
PO BOX 408, SOUTH HEIGHTS, PA 15081-0408
PO BOX 409, SOUTH HEIGHTS, PA 15081-0409
PO BOX 410, SOUTH HEIGHTS, PA 15081-0410
PO BOX 411, SOUTH HEIGHTS, PA 15081-0411
PO BOX 412, SOUTH HEIGHTS, PA 15081-0412
PO BOX 413, SOUTH HEIGHTS, PA 15081-0413
PO BOX 414, SOUTH HEIGHTS, PA 15081-0414
PO BOX 415, SOUTH HEIGHTS, PA 15081-0415
PO BOX 416, SOUTH HEIGHTS, PA 15081-0416
PO BOX 417, SOUTH HEIGHTS, PA 15081-0417
PO BOX 418, SOUTH HEIGHTS, PA 15081-0418
PO BOX 419, SOUTH HEIGHTS, PA 15081-0419
PO BOX 420, SOUTH HEIGHTS, PA 15081-0420
PO BOX 421, SOUTH HEIGHTS, PA 15081-0421
PO BOX 422, SOUTH HEIGHTS, PA 15081-0422
PO BOX 423, SOUTH HEIGHTS, PA 15081-0423
PO BOX 424, SOUTH HEIGHTS, PA 15081-0424
PO BOX 425, SOUTH HEIGHTS, PA 15081-0425
PO BOX 426, SOUTH HEIGHTS, PA 15081-0426
PO BOX 427, SOUTH HEIGHTS, PA 15081-0427
PO BOX 428, SOUTH HEIGHTS, PA 15081-0428
PO BOX 429, SOUTH HEIGHTS, PA 15081-0429
PO BOX 430, SOUTH HEIGHTS, PA 15081-0430
PO BOX 431, SOUTH HEIGHTS, PA 15081-0431
PO BOX 432, SOUTH HEIGHTS, PA 15081-0432
PO BOX 433, SOUTH HEIGHTS, PA 15081-0433
PO BOX 434, SOUTH HEIGHTS, PA 15081-0434
PO BOX 435, SOUTH HEIGHTS, PA 15081-0435
PO BOX 436, SOUTH HEIGHTS, PA 15081-0436
PO BOX 437, SOUTH HEIGHTS, PA 15081-0437
PO BOX 438, SOUTH HEIGHTS, PA 15081-0438
PO BOX 439, SOUTH HEIGHTS, PA 15081-0439
PO BOX 440, SOUTH HEIGHTS, PA 15081-0440
PO BOX 441, SOUTH HEIGHTS, PA 15081-0441
PO BOX 442, SOUTH HEIGHTS, PA 15081-0442
PO BOX 443, SOUTH HEIGHTS, PA 15081-0443
PO BOX 444, SOUTH HEIGHTS, PA 15081-0444
PO BOX 445, SOUTH HEIGHTS, PA 15081-0445
PO BOX 446, SOUTH HEIGHTS, PA 15081-0446
PO BOX 447, SOUTH HEIGHTS, PA 15081-0447
PO BOX 448, SOUTH HEIGHTS, PA 15081-0448
PO BOX 449, SOUTH HEIGHTS, PA 15081-0449
PO BOX 450, SOUTH HEIGHTS, PA 15081-0450
PO BOX 451, SOUTH HEIGHTS, PA 15081-0451
PO BOX 452, SOUTH HEIGHTS, PA 15081-0452
PO BOX 453, SOUTH HEIGHTS, PA 15081-0453
PO BOX 454, SOUTH HEIGHTS, PA 15081-0454
PO BOX 455, SOUTH HEIGHTS, PA 15081-0455
PO BOX 456, SOUTH HEIGHTS, PA 15081-0456
PO BOX 457, SOUTH HEIGHTS, PA 15081-0457
PO BOX 458, SOUTH HEIGHTS, PA 15081-0458
PO BOX 459, SOUTH HEIGHTS, PA 15081-0459
PO BOX 460, SOUTH HEIGHTS, PA 15081-0460
PO BOX 461, SOUTH HEIGHTS, PA 15081-0461
PO BOX 462, SOUTH HEIGHTS, PA 15081-0462
PO BOX 463, SOUTH HEIGHTS, PA 15081-0463
PO BOX 464, SOUTH HEIGHTS, PA 15081-0464
PO BOX 465, SOUTH HEIGHTS, PA 15081-0465
PO BOX 466, SOUTH HEIGHTS, PA 15081-0466
PO BOX 467, SOUTH HEIGHTS, PA 15081-0467
PO BOX 468, SOUTH HEIGHTS, PA 15081-0468
PO BOX 469, SOUTH HEIGHTS, PA 15081-0469
PO BOX 470, SOUTH HEIGHTS, PA 15081-0470
PO BOX 471, SOUTH HEIGHTS, PA 15081-0471
PO BOX 472, SOUTH HEIGHTS, PA 15081-0472
PO BOX 473, SOUTH HEIGHTS, PA 15081-0473
PO BOX 474, SOUTH HEIGHTS, PA 15081-0474
PO BOX 475, SOUTH HEIGHTS, PA 15081-0475
PO BOX 476, SOUTH HEIGHTS, PA 15081-0476
PO BOX 477, SOUTH HEIGHTS, PA 15081-0477
PO BOX 478, SOUTH HEIGHTS, PA 15081-0478
PO BOX 479, SOUTH HEIGHTS, PA 15081-0479
PO BOX 480, SOUTH HEIGHTS, PA 15081-0480
PO BOX 481, SOUTH HEIGHTS, PA 15081-0481
PO BOX 482, SOUTH HEIGHTS, PA 15081-0482
PO BOX 483, SOUTH HEIGHTS, PA 15081-0483
PO BOX 484, SOUTH HEIGHTS, PA 15081-0484
PO BOX 485, SOUTH HEIGHTS, PA 15081-0485
PO BOX 486, SOUTH HEIGHTS, PA 15081-0486
PO BOX 487, SOUTH HEIGHTS, PA 15081-0487
PO BOX 488, SOUTH HEIGHTS, PA 15081-0488
PO BOX 489, SOUTH HEIGHTS, PA 15081-0489
PO BOX 490, SOUTH HEIGHTS, PA 15081-0490
PO BOX 491, SOUTH HEIGHTS, PA 15081-0491
PO BOX 492, SOUTH HEIGHTS, PA 15081-0492
PO BOX 493, SOUTH HEIGHTS, PA 15081-0493
PO BOX 494, SOUTH HEIGHTS, PA 15081-0494
PO BOX 495, SOUTH HEIGHTS, PA 15081-0495
PO BOX 496, SOUTH HEIGHTS, PA 15081-0496
PO BOX 497, SOUTH HEIGHTS, PA 15081-0497
PO BOX 498, SOUTH HEIGHTS, PA 15081-0498
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