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 241, SOUTH MOUNTAIN, PA 17261-0241
PO BOX 242, SOUTH MOUNTAIN, PA 17261-0242
PO BOX 243, SOUTH MOUNTAIN, PA 17261-0243
PO BOX 244, SOUTH MOUNTAIN, PA 17261-0244
PO BOX 245, SOUTH MOUNTAIN, PA 17261-0245
PO BOX 246, SOUTH MOUNTAIN, PA 17261-0246
PO BOX 247, SOUTH MOUNTAIN, PA 17261-0247
PO BOX 248, SOUTH MOUNTAIN, PA 17261-0248
PO BOX 249, SOUTH MOUNTAIN, PA 17261-0249
PO BOX 250, SOUTH MOUNTAIN, PA 17261-0250
PO BOX 251, SOUTH MOUNTAIN, PA 17261-0251
PO BOX 252, SOUTH MOUNTAIN, PA 17261-0252
PO BOX 253, SOUTH MOUNTAIN, PA 17261-0253
PO BOX 254, SOUTH MOUNTAIN, PA 17261-0254
PO BOX 255, SOUTH MOUNTAIN, PA 17261-0255
PO BOX 256, SOUTH MOUNTAIN, PA 17261-0256
PO BOX 257, SOUTH MOUNTAIN, PA 17261-0257
PO BOX 258, SOUTH MOUNTAIN, PA 17261-0258
PO BOX 259, SOUTH MOUNTAIN, PA 17261-0259
PO BOX 260, SOUTH MOUNTAIN, PA 17261-0260
PO BOX 261, SOUTH MOUNTAIN, PA 17261-0261
PO BOX 262, SOUTH MOUNTAIN, PA 17261-0262
PO BOX 263, SOUTH MOUNTAIN, PA 17261-0263
PO BOX 264, SOUTH MOUNTAIN, PA 17261-0264
PO BOX 265, SOUTH MOUNTAIN, PA 17261-0265
PO BOX 266, SOUTH MOUNTAIN, PA 17261-0266
PO BOX 267, SOUTH MOUNTAIN, PA 17261-0267
PO BOX 268, SOUTH MOUNTAIN, PA 17261-0268
PO BOX 269, SOUTH MOUNTAIN, PA 17261-0269
PO BOX 270, SOUTH MOUNTAIN, PA 17261-0270
PO BOX 271, SOUTH MOUNTAIN, PA 17261-0271
PO BOX 272, SOUTH MOUNTAIN, PA 17261-0272
PO BOX 273, SOUTH MOUNTAIN, PA 17261-0273
PO BOX 274, SOUTH MOUNTAIN, PA 17261-0274
PO BOX 275, SOUTH MOUNTAIN, PA 17261-0275
PO BOX 276, SOUTH MOUNTAIN, PA 17261-0276
PO BOX 277, SOUTH MOUNTAIN, PA 17261-0277
PO BOX 278, SOUTH MOUNTAIN, PA 17261-0278
PO BOX 279, SOUTH MOUNTAIN, PA 17261-0279
PO BOX 280, SOUTH MOUNTAIN, PA 17261-0280
PO BOX 281, SOUTH MOUNTAIN, PA 17261-0281
PO BOX 282, SOUTH MOUNTAIN, PA 17261-0282
PO BOX 283, SOUTH MOUNTAIN, PA 17261-0283
PO BOX 284, SOUTH MOUNTAIN, PA 17261-0284
PO BOX 285, SOUTH MOUNTAIN, PA 17261-0285
PO BOX 286, SOUTH MOUNTAIN, PA 17261-0286
PO BOX 287, SOUTH MOUNTAIN, PA 17261-0287
PO BOX 288, SOUTH MOUNTAIN, PA 17261-0288
PO BOX 289, SOUTH MOUNTAIN, PA 17261-0289
PO BOX 290, SOUTH MOUNTAIN, PA 17261-0290
PO BOX 291, SOUTH MOUNTAIN, PA 17261-0291
PO BOX 292, SOUTH MOUNTAIN, PA 17261-0292
PO BOX 293, SOUTH MOUNTAIN, PA 17261-0293
PO BOX 294, SOUTH MOUNTAIN, PA 17261-0294
PO BOX 295, SOUTH MOUNTAIN, PA 17261-0295
PO BOX 296, SOUTH MOUNTAIN, PA 17261-0296
PO BOX 297, SOUTH MOUNTAIN, PA 17261-0297
PO BOX 298, SOUTH MOUNTAIN, PA 17261-0298
PO BOX 299, SOUTH MOUNTAIN, PA 17261-0299
PO BOX 300, SOUTH MOUNTAIN, PA 17261-0300
PO BOX 301, SOUTH MOUNTAIN, PA 17261-0301
PO BOX 302, SOUTH MOUNTAIN, PA 17261-0302
PO BOX 303, SOUTH MOUNTAIN, PA 17261-0303
PO BOX 304, SOUTH MOUNTAIN, PA 17261-0304
PO BOX 305, SOUTH MOUNTAIN, PA 17261-0305
PO BOX 306, SOUTH MOUNTAIN, PA 17261-0306
PO BOX 307, SOUTH MOUNTAIN, PA 17261-0307
PO BOX 308, SOUTH MOUNTAIN, PA 17261-0308
PO BOX 309, SOUTH MOUNTAIN, PA 17261-0309
PO BOX 310, SOUTH MOUNTAIN, PA 17261-0310
PO BOX 311, SOUTH MOUNTAIN, PA 17261-0311
PO BOX 312, SOUTH MOUNTAIN, PA 17261-0312
PO BOX 313, SOUTH MOUNTAIN, PA 17261-0313
PO BOX 314, SOUTH MOUNTAIN, PA 17261-0314
PO BOX 315, SOUTH MOUNTAIN, PA 17261-0315
PO BOX 316, SOUTH MOUNTAIN, PA 17261-0316
PO BOX 317, SOUTH MOUNTAIN, PA 17261-0317
PO BOX 318, SOUTH MOUNTAIN, PA 17261-0318
PO BOX 319, SOUTH MOUNTAIN, PA 17261-0319
PO BOX 320, SOUTH MOUNTAIN, PA 17261-0320
PO BOX 321, SOUTH MOUNTAIN, PA 17261-0321
PO BOX 322, SOUTH MOUNTAIN, PA 17261-0322
PO BOX 323, SOUTH MOUNTAIN, PA 17261-0323
PO BOX 324, SOUTH MOUNTAIN, PA 17261-0324
PO BOX 325, SOUTH MOUNTAIN, PA 17261-0325
PO BOX 326, SOUTH MOUNTAIN, PA 17261-0326
PO BOX 327, SOUTH MOUNTAIN, PA 17261-0327
PO BOX 328, SOUTH MOUNTAIN, PA 17261-0328
PO BOX 329, SOUTH MOUNTAIN, PA 17261-0329
PO BOX 330, SOUTH MOUNTAIN, PA 17261-0330
PO BOX 331, SOUTH MOUNTAIN, PA 17261-0331
PO BOX 332, SOUTH MOUNTAIN, PA 17261-0332
PO BOX 333, SOUTH MOUNTAIN, PA 17261-0333
PO BOX 334, SOUTH MOUNTAIN, PA 17261-0334
PO BOX 335, SOUTH MOUNTAIN, PA 17261-0335
PO BOX 336, SOUTH MOUNTAIN, PA 17261-0336
PO BOX 337, SOUTH MOUNTAIN, PA 17261-0337
PO BOX 338, SOUTH MOUNTAIN, PA 17261-0338
PO BOX 339, SOUTH MOUNTAIN, PA 17261-0339
PO BOX 340, SOUTH MOUNTAIN, PA 17261-0340
PO BOX 341, SOUTH MOUNTAIN, PA 17261-0341
PO BOX 342, SOUTH MOUNTAIN, PA 17261-0342
PO BOX 343, SOUTH MOUNTAIN, PA 17261-0343
PO BOX 344, SOUTH MOUNTAIN, PA 17261-0344
PO BOX 345, SOUTH MOUNTAIN, PA 17261-0345
PO BOX 346, SOUTH MOUNTAIN, PA 17261-0346
PO BOX 347, SOUTH MOUNTAIN, PA 17261-0347
PO BOX 348, SOUTH MOUNTAIN, PA 17261-0348
PO BOX 349, SOUTH MOUNTAIN, PA 17261-0349
PO BOX 350, SOUTH MOUNTAIN, PA 17261-0350
PO BOX 351, SOUTH MOUNTAIN, PA 17261-0351
PO BOX 352, SOUTH MOUNTAIN, PA 17261-0352
PO BOX 353, SOUTH MOUNTAIN, PA 17261-0353
PO BOX 354, SOUTH MOUNTAIN, PA 17261-0354
PO BOX 355, SOUTH MOUNTAIN, PA 17261-0355
PO BOX 356, SOUTH MOUNTAIN, PA 17261-0356
PO BOX 357, SOUTH MOUNTAIN, PA 17261-0357
PO BOX 358, SOUTH MOUNTAIN, PA 17261-0358
PO BOX 359, SOUTH MOUNTAIN, PA 17261-0359
PO BOX 360, SOUTH MOUNTAIN, PA 17261-0360
PO BOX 361, SOUTH MOUNTAIN, PA 17261-0361
PO BOX 362, SOUTH MOUNTAIN, PA 17261-0362
PO BOX 363, SOUTH MOUNTAIN, PA 17261-0363
PO BOX 364, SOUTH MOUNTAIN, PA 17261-0364
PO BOX 365, SOUTH MOUNTAIN, PA 17261-0365
PO BOX 366, SOUTH MOUNTAIN, PA 17261-0366
PO BOX 367, SOUTH MOUNTAIN, PA 17261-0367
PO BOX 368, SOUTH MOUNTAIN, PA 17261-0368
PO BOX 369, SOUTH MOUNTAIN, PA 17261-0369
PO BOX 370, SOUTH MOUNTAIN, PA 17261-0370
PO BOX 371, SOUTH MOUNTAIN, PA 17261-0371
PO BOX 372, SOUTH MOUNTAIN, PA 17261-0372
PO BOX 373, SOUTH MOUNTAIN, PA 17261-0373
PO BOX 374, SOUTH MOUNTAIN, PA 17261-0374
PO BOX 375, SOUTH MOUNTAIN, PA 17261-0375
PO BOX 376, SOUTH MOUNTAIN, PA 17261-0376
PO BOX 377, SOUTH MOUNTAIN, PA 17261-0377
PO BOX 378, SOUTH MOUNTAIN, PA 17261-0378
PO BOX 379, SOUTH MOUNTAIN, PA 17261-0379
PO BOX 380, SOUTH MOUNTAIN, PA 17261-0380
PO BOX 381, SOUTH MOUNTAIN, PA 17261-0381
PO BOX 382, SOUTH MOUNTAIN, PA 17261-0382
PO BOX 383, SOUTH MOUNTAIN, PA 17261-0383
PO BOX 384, SOUTH MOUNTAIN, PA 17261-0384
PO BOX 385, SOUTH MOUNTAIN, PA 17261-0385
PO BOX 386, SOUTH MOUNTAIN, PA 17261-0386
PO BOX 387, SOUTH MOUNTAIN, PA 17261-0387
PO BOX 388, SOUTH MOUNTAIN, PA 17261-0388
PO BOX 389, SOUTH MOUNTAIN, PA 17261-0389
PO BOX 390, SOUTH MOUNTAIN, PA 17261-0390
PO BOX 391, SOUTH MOUNTAIN, PA 17261-0391
PO BOX 392, SOUTH MOUNTAIN, PA 17261-0392
PO BOX 393, SOUTH MOUNTAIN, PA 17261-0393
PO BOX 394, SOUTH MOUNTAIN, PA 17261-0394
PO BOX 395, SOUTH MOUNTAIN, PA 17261-0395
PO BOX 396, SOUTH MOUNTAIN, PA 17261-0396
PO BOX 397, SOUTH MOUNTAIN, PA 17261-0397
PO BOX 398, SOUTH MOUNTAIN, PA 17261-0398
PO BOX 399, SOUTH MOUNTAIN, PA 17261-0399
PO BOX 400, SOUTH MOUNTAIN, PA 17261-0400
PO BOX 401, SOUTH MOUNTAIN, PA 17261-0401
PO BOX 402, SOUTH MOUNTAIN, PA 17261-0402
PO BOX 403, SOUTH MOUNTAIN, PA 17261-0403
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