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 200205, PITTSBURGH, PA 15251-0205
PO BOX 200206, PITTSBURGH, PA 15251-0206
PO BOX 200207, PITTSBURGH, PA 15251-0207
PO BOX 200208, PITTSBURGH, PA 15251-0208
PO BOX 200209, PITTSBURGH, PA 15251-0209
PO BOX 200210, PITTSBURGH, PA 15251-0210
PO BOX 200211, PITTSBURGH, PA 15251-0211
PO BOX 200212, PITTSBURGH, PA 15251-0212
PO BOX 200213, PITTSBURGH, PA 15251-0213
PO BOX 200214, PITTSBURGH, PA 15251-0214
PO BOX 200215, PITTSBURGH, PA 15251-0215
PO BOX 200216, PITTSBURGH, PA 15251-0216
PO BOX 200217, PITTSBURGH, PA 15251-0217
PO BOX 200218, PITTSBURGH, PA 15251-0218
PO BOX 200219, PITTSBURGH, PA 15251-0219
PO BOX 200220, PITTSBURGH, PA 15251-0220
PO BOX 200221, PITTSBURGH, PA 15251-0221
PO BOX 200222, PITTSBURGH, PA 15251-0222
PO BOX 200223, PITTSBURGH, PA 15251-0223
PO BOX 200224, PITTSBURGH, PA 15251-0224
PO BOX 200225, PITTSBURGH, PA 15251-0225
PO BOX 200226, PITTSBURGH, PA 15251-0226
PO BOX 200227, PITTSBURGH, PA 15251-0227
PO BOX 200228, PITTSBURGH, PA 15251-0228
PO BOX 200229, PITTSBURGH, PA 15251-0229
PO BOX 200230, PITTSBURGH, PA 15251-0230
PO BOX 200231, PITTSBURGH, PA 15251-0231
PO BOX 200232, PITTSBURGH, PA 15251-0232
PO BOX 200233, PITTSBURGH, PA 15251-0233
PO BOX 200234, PITTSBURGH, PA 15251-0234
PO BOX 200235, PITTSBURGH, PA 15251-0235
PO BOX 200236, PITTSBURGH, PA 15251-0236
PO BOX 200237, PITTSBURGH, PA 15251-0237
PO BOX 200238, PITTSBURGH, PA 15251-0238
PO BOX 200239, PITTSBURGH, PA 15251-0239
PO BOX 200240, PITTSBURGH, PA 15251-0240
PO BOX 200241, PITTSBURGH, PA 15251-0241
PO BOX 200242, PITTSBURGH, PA 15251-0242
PO BOX 200243, PITTSBURGH, PA 15251-0243
PO BOX 200244, PITTSBURGH, PA 15251-0244
PO BOX 200245, PITTSBURGH, PA 15251-0245
PO BOX 200246, PITTSBURGH, PA 15251-0246
PO BOX 200247, PITTSBURGH, PA 15251-0247
PO BOX 200248, PITTSBURGH, PA 15251-0248
PO BOX 200249, PITTSBURGH, PA 15251-0249
PO BOX 200250, PITTSBURGH, PA 15251-0250
PO BOX 200251, PITTSBURGH, PA 15251-0251
PO BOX 200252, PITTSBURGH, PA 15251-0252
PO BOX 200253, PITTSBURGH, PA 15251-0253
PO BOX 200254, PITTSBURGH, PA 15251-0254
PO BOX 200255, PITTSBURGH, PA 15251-0255
PO BOX 200256, PITTSBURGH, PA 15251-0256
PO BOX 200257, PITTSBURGH, PA 15251-0257
PO BOX 200258, PITTSBURGH, PA 15251-0258
PO BOX 200259, PITTSBURGH, PA 15251-0259
PO BOX 200260, PITTSBURGH, PA 15251-0260
PO BOX 200261, PITTSBURGH, PA 15251-0261
PO BOX 200262, PITTSBURGH, PA 15251-0262
PO BOX 200263, PITTSBURGH, PA 15251-0263
PO BOX 200264, PITTSBURGH, PA 15251-0264
PO BOX 200265, PITTSBURGH, PA 15251-0265
PO BOX 200266, PITTSBURGH, PA 15251-0266
PO BOX 200267, PITTSBURGH, PA 15251-0267
PO BOX 200268, PITTSBURGH, PA 15251-0268
PO BOX 200269, PITTSBURGH, PA 15251-0269
PO BOX 200270, PITTSBURGH, PA 15251-0270
PO BOX 200271, PITTSBURGH, PA 15251-0271
PO BOX 200272, PITTSBURGH, PA 15251-0272
PO BOX 200273, PITTSBURGH, PA 15251-0273
PO BOX 200274, PITTSBURGH, PA 15251-0274
PO BOX 200275, PITTSBURGH, PA 15251-0275
PO BOX 200276, PITTSBURGH, PA 15251-0276
PO BOX 200277, PITTSBURGH, PA 15251-0277
PO BOX 200278, PITTSBURGH, PA 15251-0278
PO BOX 200279, PITTSBURGH, PA 15251-0279
PO BOX 200280, PITTSBURGH, PA 15251-0280
PO BOX 200281, PITTSBURGH, PA 15251-0281
PO BOX 200282, PITTSBURGH, PA 15251-0282
PO BOX 200283, PITTSBURGH, PA 15251-0283
PO BOX 200284, PITTSBURGH, PA 15251-0284
PO BOX 200285, PITTSBURGH, PA 15251-0285
PO BOX 200286, PITTSBURGH, PA 15251-0286
PO BOX 200287, PITTSBURGH, PA 15251-0287
PO BOX 200288, PITTSBURGH, PA 15251-0288
PO BOX 200289, PITTSBURGH, PA 15251-0289
PO BOX 200290, PITTSBURGH, PA 15251-0290
PO BOX 200291, PITTSBURGH, PA 15251-0291
PO BOX 200292, PITTSBURGH, PA 15251-0292
PO BOX 200293, PITTSBURGH, PA 15251-0293
PO BOX 200294, PITTSBURGH, PA 15251-0294
PO BOX 200295, PITTSBURGH, PA 15251-0295
PO BOX 200296, PITTSBURGH, PA 15251-0296
PO BOX 200297, PITTSBURGH, PA 15251-0297
PO BOX 200298, PITTSBURGH, PA 15251-0298
PO BOX 200299, PITTSBURGH, PA 15251-0299
PO BOX 200300, PITTSBURGH, PA 15251-0300
PO BOX 200301, PITTSBURGH, PA 15251-0301
PO BOX 200302, PITTSBURGH, PA 15251-0302
PO BOX 200303, PITTSBURGH, PA 15251-0303
PO BOX 200304, PITTSBURGH, PA 15251-0304
PO BOX 200305, PITTSBURGH, PA 15251-0305
PO BOX 200306, PITTSBURGH, PA 15251-0306
PO BOX 200307, PITTSBURGH, PA 15251-0307
PO BOX 200308, PITTSBURGH, PA 15251-0308
PO BOX 200309, PITTSBURGH, PA 15251-0309
PO BOX 200310, PITTSBURGH, PA 15251-0310
PO BOX 200311, PITTSBURGH, PA 15251-0311
PO BOX 200312, PITTSBURGH, PA 15251-0312
PO BOX 200313, PITTSBURGH, PA 15251-0313
PO BOX 200314, PITTSBURGH, PA 15251-0314
PO BOX 200315, PITTSBURGH, PA 15251-0315
PO BOX 200316, PITTSBURGH, PA 15251-0316
PO BOX 200317, PITTSBURGH, PA 15251-0317
PO BOX 200318, PITTSBURGH, PA 15251-0318
PO BOX 200319, PITTSBURGH, PA 15251-0319
PO BOX 200320, PITTSBURGH, PA 15251-0320
PO BOX 200321, PITTSBURGH, PA 15251-0321
PO BOX 200322, PITTSBURGH, PA 15251-0322
PO BOX 200323, PITTSBURGH, PA 15251-0323
PO BOX 200324, PITTSBURGH, PA 15251-0324
PO BOX 200325, PITTSBURGH, PA 15251-0325
PO BOX 200326, PITTSBURGH, PA 15251-0326
PO BOX 200327, PITTSBURGH, PA 15251-0327
PO BOX 200328, PITTSBURGH, PA 15251-0328
PO BOX 200329, PITTSBURGH, PA 15251-0329
PO BOX 200330, PITTSBURGH, PA 15251-0330
PO BOX 200331, PITTSBURGH, PA 15251-0331
PO BOX 200332, PITTSBURGH, PA 15251-0332
PO BOX 200333, PITTSBURGH, PA 15251-0333
PO BOX 200334, PITTSBURGH, PA 15251-0334
PO BOX 200335, PITTSBURGH, PA 15251-0335
PO BOX 200336, PITTSBURGH, PA 15251-0336
PO BOX 200337, PITTSBURGH, PA 15251-0337
PO BOX 200338, PITTSBURGH, PA 15251-0338
PO BOX 200339, PITTSBURGH, PA 15251-0339
PO BOX 200340, PITTSBURGH, PA 15251-0340
PO BOX 200341, PITTSBURGH, PA 15251-0341
PO BOX 200342, PITTSBURGH, PA 15251-0342
PO BOX 200343, PITTSBURGH, PA 15251-0343
PO BOX 200344, PITTSBURGH, PA 15251-0344
PO BOX 200345, PITTSBURGH, PA 15251-0345
PO BOX 200346, PITTSBURGH, PA 15251-0346
PO BOX 200347, PITTSBURGH, PA 15251-0347
PO BOX 200348, PITTSBURGH, PA 15251-0348
PO BOX 200349, PITTSBURGH, PA 15251-0349
PO BOX 200350, PITTSBURGH, PA 15251-0350
PO BOX 200351, PITTSBURGH, PA 15251-0351
PO BOX 200352, PITTSBURGH, PA 15251-0352
PO BOX 200353, PITTSBURGH, PA 15251-0353
PO BOX 200354, PITTSBURGH, PA 15251-0354
PO BOX 200355, PITTSBURGH, PA 15251-0355
PO BOX 200356, PITTSBURGH, PA 15251-0356
PO BOX 200357, PITTSBURGH, PA 15251-0357
PO BOX 200358, PITTSBURGH, PA 15251-0358
PO BOX 200359, PITTSBURGH, PA 15251-0359
PO BOX 200360, PITTSBURGH, PA 15251-0360
PO BOX 200361, PITTSBURGH, PA 15251-0361
PO BOX 200362, PITTSBURGH, PA 15251-0362
PO BOX 200363, PITTSBURGH, PA 15251-0363
PO BOX 200364, PITTSBURGH, PA 15251-0364
PO BOX 200365, PITTSBURGH, PA 15251-0365
PO BOX 200366, PITTSBURGH, PA 15251-0366
PO BOX 200367, PITTSBURGH, PA 15251-0367
PO BOX 200368, PITTSBURGH, PA 15251-0368
PO BOX 200369, PITTSBURGH, PA 15251-0369
PO BOX 200370, PITTSBURGH, PA 15251-0370
PO BOX 200371, PITTSBURGH, PA 15251-0371
PO BOX 200372, PITTSBURGH, PA 15251-0372
PO BOX 200373, PITTSBURGH, PA 15251-0373
PO BOX 200374, PITTSBURGH, PA 15251-0374
PO BOX 200375, PITTSBURGH, PA 15251-0375
PO BOX 200376, PITTSBURGH, PA 15251-0376
PO BOX 200377, PITTSBURGH, PA 15251-0377
PO BOX 200378, PITTSBURGH, PA 15251-0378
PO BOX 200379, PITTSBURGH, PA 15251-0379
PO BOX 200380, PITTSBURGH, PA 15251-0380
PO BOX 200381, PITTSBURGH, PA 15251-0381
PO BOX 200382, PITTSBURGH, PA 15251-0382
PO BOX 200383, PITTSBURGH, PA 15251-0383
PO BOX 200384, PITTSBURGH, PA 15251-0384
PO BOX 200385, PITTSBURGH, PA 15251-0385
PO BOX 200386, PITTSBURGH, PA 15251-0386
PO BOX 200387, PITTSBURGH, PA 15251-0387
PO BOX 200388, PITTSBURGH, PA 15251-0388
PO BOX 200389, PITTSBURGH, PA 15251-0389
PO BOX 200390, PITTSBURGH, PA 15251-0390
PO BOX 200391, PITTSBURGH, PA 15251-0391
PO BOX 200392, PITTSBURGH, PA 15251-0392
PO BOX 200393, PITTSBURGH, PA 15251-0393
PO BOX 200394, PITTSBURGH, PA 15251-0394
PO BOX 200395, PITTSBURGH, PA 15251-0395
PO BOX 200396, PITTSBURGH, PA 15251-0396
PO BOX 200397, PITTSBURGH, PA 15251-0397
PO BOX 200398, PITTSBURGH, PA 15251-0398
PO BOX 200399, PITTSBURGH, PA 15251-0399
PO BOX 200400, PITTSBURGH, PA 15251-0400
PO BOX 200401, PITTSBURGH, PA 15251-0401
PO BOX 200402, PITTSBURGH, PA 15251-0402
PO BOX 200403, PITTSBURGH, PA 15251-0403
PO BOX 200404, PITTSBURGH, PA 15251-0404
PO BOX 200405, PITTSBURGH, PA 15251-0405
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