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, SPRING MOUNT, PA 19478-0301
PO BOX 302, SPRING MOUNT, PA 19478-0302
PO BOX 303, SPRING MOUNT, PA 19478-0303
PO BOX 304, SPRING MOUNT, PA 19478-0304
PO BOX 305, SPRING MOUNT, PA 19478-0305
PO BOX 306, SPRING MOUNT, PA 19478-0306
PO BOX 307, SPRING MOUNT, PA 19478-0307
PO BOX 308, SPRING MOUNT, PA 19478-0308
PO BOX 309, SPRING MOUNT, PA 19478-0309
PO BOX 310, SPRING MOUNT, PA 19478-0310
PO BOX 311, SPRING MOUNT, PA 19478-0311
PO BOX 312, SPRING MOUNT, PA 19478-0312
PO BOX 313, SPRING MOUNT, PA 19478-0313
PO BOX 314, SPRING MOUNT, PA 19478-0314
PO BOX 315, SPRING MOUNT, PA 19478-0315
PO BOX 316, SPRING MOUNT, PA 19478-0316
PO BOX 317, SPRING MOUNT, PA 19478-0317
PO BOX 318, SPRING MOUNT, PA 19478-0318
PO BOX 319, SPRING MOUNT, PA 19478-0319
PO BOX 320, SPRING MOUNT, PA 19478-0320
PO BOX 321, SPRING MOUNT, PA 19478-0321
PO BOX 322, SPRING MOUNT, PA 19478-0322
PO BOX 323, SPRING MOUNT, PA 19478-0323
PO BOX 324, SPRING MOUNT, PA 19478-0324
PO BOX 325, SPRING MOUNT, PA 19478-0325
PO BOX 326, SPRING MOUNT, PA 19478-0326
PO BOX 327, SPRING MOUNT, PA 19478-0327
PO BOX 328, SPRING MOUNT, PA 19478-0328
PO BOX 329, SPRING MOUNT, PA 19478-0329
PO BOX 330, SPRING MOUNT, PA 19478-0330
PO BOX 331, SPRING MOUNT, PA 19478-0331
PO BOX 332, SPRING MOUNT, PA 19478-0332
PO BOX 333, SPRING MOUNT, PA 19478-0333
PO BOX 334, SPRING MOUNT, PA 19478-0334
PO BOX 335, SPRING MOUNT, PA 19478-0335
PO BOX 336, SPRING MOUNT, PA 19478-0336
PO BOX 337, SPRING MOUNT, PA 19478-0337
PO BOX 338, SPRING MOUNT, PA 19478-0338
PO BOX 339, SPRING MOUNT, PA 19478-0339
PO BOX 340, SPRING MOUNT, PA 19478-0340
PO BOX 341, SPRING MOUNT, PA 19478-0341
PO BOX 342, SPRING MOUNT, PA 19478-0342
PO BOX 343, SPRING MOUNT, PA 19478-0343
PO BOX 344, SPRING MOUNT, PA 19478-0344
PO BOX 345, SPRING MOUNT, PA 19478-0345
PO BOX 346, SPRING MOUNT, PA 19478-0346
PO BOX 347, SPRING MOUNT, PA 19478-0347
PO BOX 348, SPRING MOUNT, PA 19478-0348
PO BOX 349, SPRING MOUNT, PA 19478-0349
PO BOX 350, SPRING MOUNT, PA 19478-0350
PO BOX 351, SPRING MOUNT, PA 19478-0351
PO BOX 352, SPRING MOUNT, PA 19478-0352
PO BOX 353, SPRING MOUNT, PA 19478-0353
PO BOX 354, SPRING MOUNT, PA 19478-0354
PO BOX 355, SPRING MOUNT, PA 19478-0355
PO BOX 356, SPRING MOUNT, PA 19478-0356
PO BOX 357, SPRING MOUNT, PA 19478-0357
PO BOX 358, SPRING MOUNT, PA 19478-0358
PO BOX 359, SPRING MOUNT, PA 19478-0359
PO BOX 360, SPRING MOUNT, PA 19478-0360
PO BOX 361, SPRING MOUNT, PA 19478-0361
PO BOX 362, SPRING MOUNT, PA 19478-0362
PO BOX 363, SPRING MOUNT, PA 19478-0363
PO BOX 364, SPRING MOUNT, PA 19478-0364
PO BOX 365, SPRING MOUNT, PA 19478-0365
PO BOX 366, SPRING MOUNT, PA 19478-0366
PO BOX 367, SPRING MOUNT, PA 19478-0367
PO BOX 368, SPRING MOUNT, PA 19478-0368
PO BOX 369, SPRING MOUNT, PA 19478-0369
PO BOX 370, SPRING MOUNT, PA 19478-0370
PO BOX 371, SPRING MOUNT, PA 19478-0371
PO BOX 372, SPRING MOUNT, PA 19478-0372
PO BOX 373, SPRING MOUNT, PA 19478-0373
PO BOX 374, SPRING MOUNT, PA 19478-0374
PO BOX 375, SPRING MOUNT, PA 19478-0375
PO BOX 376, SPRING MOUNT, PA 19478-0376
PO BOX 377, SPRING MOUNT, PA 19478-0377
PO BOX 378, SPRING MOUNT, PA 19478-0378
PO BOX 379, SPRING MOUNT, PA 19478-0379
PO BOX 380, SPRING MOUNT, PA 19478-0380
PO BOX 381, SPRING MOUNT, PA 19478-0381
PO BOX 382, SPRING MOUNT, PA 19478-0382
PO BOX 383, SPRING MOUNT, PA 19478-0383
PO BOX 384, SPRING MOUNT, PA 19478-0384
PO BOX 385, SPRING MOUNT, PA 19478-0385
PO BOX 386, SPRING MOUNT, PA 19478-0386
PO BOX 387, SPRING MOUNT, PA 19478-0387
PO BOX 388, SPRING MOUNT, PA 19478-0388
PO BOX 389, SPRING MOUNT, PA 19478-0389
PO BOX 390, SPRING MOUNT, PA 19478-0390
PO BOX 391, SPRING MOUNT, PA 19478-0391
PO BOX 392, SPRING MOUNT, PA 19478-0392
PO BOX 393, SPRING MOUNT, PA 19478-0393
PO BOX 394, SPRING MOUNT, PA 19478-0394
PO BOX 395, SPRING MOUNT, PA 19478-0395
PO BOX 396, SPRING MOUNT, PA 19478-0396
PO BOX 397, SPRING MOUNT, PA 19478-0397
PO BOX 398, SPRING MOUNT, PA 19478-0398
PO BOX 399, SPRING MOUNT, PA 19478-0399
PO BOX 400, SPRING MOUNT, PA 19478-0400
PO BOX 401, SPRING MOUNT, PA 19478-0401
PO BOX 402, SPRING MOUNT, PA 19478-0402
PO BOX 403, SPRING MOUNT, PA 19478-0403
PO BOX 404, SPRING MOUNT, PA 19478-0404
PO BOX 405, SPRING MOUNT, PA 19478-0405
PO BOX 406, SPRING MOUNT, PA 19478-0406
PO BOX 407, SPRING MOUNT, PA 19478-0407
PO BOX 408, SPRING MOUNT, PA 19478-0408
PO BOX 409, SPRING MOUNT, PA 19478-0409
PO BOX 410, SPRING MOUNT, PA 19478-0410
PO BOX 411, SPRING MOUNT, PA 19478-0411
PO BOX 412, SPRING MOUNT, PA 19478-0412
PO BOX 413, SPRING MOUNT, PA 19478-0413
PO BOX 414, SPRING MOUNT, PA 19478-0414
PO BOX 415, SPRING MOUNT, PA 19478-0415
PO BOX 416, SPRING MOUNT, PA 19478-0416
PO BOX 417, SPRING MOUNT, PA 19478-0417
PO BOX 418, SPRING MOUNT, PA 19478-0418
PO BOX 419, SPRING MOUNT, PA 19478-0419
PO BOX 420, SPRING MOUNT, PA 19478-0420
PO BOX 421, SPRING MOUNT, PA 19478-0421
PO BOX 422, SPRING MOUNT, PA 19478-0422
PO BOX 423, SPRING MOUNT, PA 19478-0423
PO BOX 424, SPRING MOUNT, PA 19478-0424
PO BOX 425, SPRING MOUNT, PA 19478-0425
PO BOX 426, SPRING MOUNT, PA 19478-0426
PO BOX 427, SPRING MOUNT, PA 19478-0427
PO BOX 428, SPRING MOUNT, PA 19478-0428
PO BOX 429, SPRING MOUNT, PA 19478-0429
PO BOX 430, SPRING MOUNT, PA 19478-0430
PO BOX 431, SPRING MOUNT, PA 19478-0431
PO BOX 432, SPRING MOUNT, PA 19478-0432
PO BOX 433, SPRING MOUNT, PA 19478-0433
PO BOX 434, SPRING MOUNT, PA 19478-0434
PO BOX 435, SPRING MOUNT, PA 19478-0435
PO BOX 436, SPRING MOUNT, PA 19478-0436
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