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 640195, PITTSBURGH, PA 15264-0195
PO BOX 640196, PITTSBURGH, PA 15264-0196
PO BOX 640197, PITTSBURGH, PA 15264-0197
PO BOX 640198, PITTSBURGH, PA 15264-0198
PO BOX 640199, PITTSBURGH, PA 15264-0199
PO BOX 640200, PITTSBURGH, PA 15264-0200
PO BOX 640201, PITTSBURGH, PA 15264-0201
PO BOX 640202, PITTSBURGH, PA 15264-0202
PO BOX 640203, PITTSBURGH, PA 15264-0203
PO BOX 640204, PITTSBURGH, PA 15264-0204
PO BOX 640205, PITTSBURGH, PA 15264-0205
PO BOX 640206, PITTSBURGH, PA 15264-0206
PO BOX 640207, PITTSBURGH, PA 15264-0207
PO BOX 640208, PITTSBURGH, PA 15264-0208
PO BOX 640209, PITTSBURGH, PA 15264-0209
PO BOX 640210, PITTSBURGH, PA 15264-0210
PO BOX 640211, PITTSBURGH, PA 15264-0211
PO BOX 640212, PITTSBURGH, PA 15264-0212
PO BOX 640213, PITTSBURGH, PA 15264-0213
PO BOX 640214, PITTSBURGH, PA 15264-0214
PO BOX 640215, PITTSBURGH, PA 15264-0215
PO BOX 640216, PITTSBURGH, PA 15264-0216
PO BOX 640217, PITTSBURGH, PA 15264-0217
PO BOX 640218, PITTSBURGH, PA 15264-0218
PO BOX 640219, PITTSBURGH, PA 15264-0219
PO BOX 640220, PITTSBURGH, PA 15264-0220
PO BOX 640221, PITTSBURGH, PA 15264-0221
PO BOX 640222, PITTSBURGH, PA 15264-0222
PO BOX 640223, PITTSBURGH, PA 15264-0223
PO BOX 640224, PITTSBURGH, PA 15264-0224
PO BOX 640225, PITTSBURGH, PA 15264-0225
PO BOX 640226, PITTSBURGH, PA 15264-0226
PO BOX 640227, PITTSBURGH, PA 15264-0227
PO BOX 640228, PITTSBURGH, PA 15264-0228
PO BOX 640229, PITTSBURGH, PA 15264-0229
PO BOX 640230, PITTSBURGH, PA 15264-0230
PO BOX 640231, PITTSBURGH, PA 15264-0231
PO BOX 640232, PITTSBURGH, PA 15264-0232
PO BOX 640233, PITTSBURGH, PA 15264-0233
PO BOX 640234, PITTSBURGH, PA 15264-0234
PO BOX 640235, PITTSBURGH, PA 15264-0235
PO BOX 640236, PITTSBURGH, PA 15264-0236
PO BOX 640237, PITTSBURGH, PA 15264-0237
PO BOX 640238, PITTSBURGH, PA 15264-0238
PO BOX 640239, PITTSBURGH, PA 15264-0239
PO BOX 640240, PITTSBURGH, PA 15264-0240
PO BOX 640241, PITTSBURGH, PA 15264-0241
PO BOX 640242, PITTSBURGH, PA 15264-0242
PO BOX 640243, PITTSBURGH, PA 15264-0243
PO BOX 640244, PITTSBURGH, PA 15264-0244
PO BOX 640245, PITTSBURGH, PA 15264-0245
PO BOX 640246, PITTSBURGH, PA 15264-0246
PO BOX 640247, PITTSBURGH, PA 15264-0247
PO BOX 640248, PITTSBURGH, PA 15264-0248
PO BOX 640249, PITTSBURGH, PA 15264-0249
PO BOX 640250, PITTSBURGH, PA 15264-0250
PO BOX 640251, PITTSBURGH, PA 15264-0251
PO BOX 640252, PITTSBURGH, PA 15264-0252
PO BOX 640253, PITTSBURGH, PA 15264-0253
PO BOX 640254, PITTSBURGH, PA 15264-0254
PO BOX 640255, PITTSBURGH, PA 15264-0255
PO BOX 640256, PITTSBURGH, PA 15264-0256
PO BOX 640257, PITTSBURGH, PA 15264-0257
PO BOX 640258, PITTSBURGH, PA 15264-0258
PO BOX 640259, PITTSBURGH, PA 15264-0259
PO BOX 640260, PITTSBURGH, PA 15264-0260
PO BOX 640261, PITTSBURGH, PA 15264-0261
PO BOX 640262, PITTSBURGH, PA 15264-0262
PO BOX 640263, PITTSBURGH, PA 15264-0263
PO BOX 640264, PITTSBURGH, PA 15264-0264
PO BOX 640265, PITTSBURGH, PA 15264-0265
PO BOX 640266, PITTSBURGH, PA 15264-0266
PO BOX 640267, PITTSBURGH, PA 15264-0267
PO BOX 640268, PITTSBURGH, PA 15264-0268
PO BOX 640269, PITTSBURGH, PA 15264-0269
PO BOX 640270, PITTSBURGH, PA 15264-0270
PO BOX 640271, PITTSBURGH, PA 15264-0271
PO BOX 640272, PITTSBURGH, PA 15264-0272
PO BOX 640273, PITTSBURGH, PA 15264-0273
PO BOX 640274, PITTSBURGH, PA 15264-0274
PO BOX 640275, PITTSBURGH, PA 15264-0275
PO BOX 640276, PITTSBURGH, PA 15264-0276
PO BOX 640277, PITTSBURGH, PA 15264-0277
PO BOX 640278, PITTSBURGH, PA 15264-0278
PO BOX 640279, PITTSBURGH, PA 15264-0279
PO BOX 640280, PITTSBURGH, PA 15264-0280
PO BOX 640281, PITTSBURGH, PA 15264-0281
PO BOX 640282, PITTSBURGH, PA 15264-0282
PO BOX 640283, PITTSBURGH, PA 15264-0283
PO BOX 640284, PITTSBURGH, PA 15264-0284
PO BOX 640285, PITTSBURGH, PA 15264-0285
PO BOX 640286, PITTSBURGH, PA 15264-0286
PO BOX 640287, PITTSBURGH, PA 15264-0287
PO BOX 640288, PITTSBURGH, PA 15264-0288
PO BOX 640289, PITTSBURGH, PA 15264-0289
PO BOX 640290, PITTSBURGH, PA 15264-0290
PO BOX 640291, PITTSBURGH, PA 15264-0291
PO BOX 640292, PITTSBURGH, PA 15264-0292
PO BOX 640293, PITTSBURGH, PA 15264-0293
PO BOX 640294, PITTSBURGH, PA 15264-0294
PO BOX 640295, PITTSBURGH, PA 15264-0295
PO BOX 640296, PITTSBURGH, PA 15264-0296
PO BOX 640297, PITTSBURGH, PA 15264-0297
PO BOX 640298, PITTSBURGH, PA 15264-0298
PO BOX 640299, PITTSBURGH, PA 15264-0299
PO BOX 640300, PITTSBURGH, PA 15264-0300
PO BOX 640301, PITTSBURGH, PA 15264-0301
PO BOX 640302, PITTSBURGH, PA 15264-0302
PO BOX 640303, PITTSBURGH, PA 15264-0303
PO BOX 640304, PITTSBURGH, PA 15264-0304
PO BOX 640305, PITTSBURGH, PA 15264-0305
PO BOX 640306, PITTSBURGH, PA 15264-0306
PO BOX 640307, PITTSBURGH, PA 15264-0307
PO BOX 640308, PITTSBURGH, PA 15264-0308
PO BOX 640309, PITTSBURGH, PA 15264-0309
PO BOX 640310, PITTSBURGH, PA 15264-0310
PO BOX 640311, PITTSBURGH, PA 15264-0311
PO BOX 640312, PITTSBURGH, PA 15264-0312
PO BOX 640313, PITTSBURGH, PA 15264-0313
PO BOX 640314, PITTSBURGH, PA 15264-0314
PO BOX 640315, PITTSBURGH, PA 15264-0315
PO BOX 640316, PITTSBURGH, PA 15264-0316
PO BOX 640317, PITTSBURGH, PA 15264-0317
PO BOX 640318, PITTSBURGH, PA 15264-0318
PO BOX 640319, PITTSBURGH, PA 15264-0319
PO BOX 640320, PITTSBURGH, PA 15264-0320
PO BOX 640321, PITTSBURGH, PA 15264-0321
PO BOX 640322, PITTSBURGH, PA 15264-0322
PO BOX 640323, PITTSBURGH, PA 15264-0323
PO BOX 640324, PITTSBURGH, PA 15264-0324
PO BOX 640325, PITTSBURGH, PA 15264-0325
PO BOX 640326, PITTSBURGH, PA 15264-0326
PO BOX 640327, PITTSBURGH, PA 15264-0327
PO BOX 640328, PITTSBURGH, PA 15264-0328
PO BOX 640329, PITTSBURGH, PA 15264-0329
PO BOX 640330, PITTSBURGH, PA 15264-0330
PO BOX 640331, PITTSBURGH, PA 15264-0331
PO BOX 640332, PITTSBURGH, PA 15264-0332
PO BOX 640333, PITTSBURGH, PA 15264-0333
PO BOX 640334, PITTSBURGH, PA 15264-0334
PO BOX 640335, PITTSBURGH, PA 15264-0335
PO BOX 640336, PITTSBURGH, PA 15264-0336
PO BOX 640337, PITTSBURGH, PA 15264-0337
PO BOX 640338, PITTSBURGH, PA 15264-0338
PO BOX 640339, PITTSBURGH, PA 15264-0339
PO BOX 640340, PITTSBURGH, PA 15264-0340
PO BOX 640341, PITTSBURGH, PA 15264-0341
PO BOX 640342, PITTSBURGH, PA 15264-0342
PO BOX 640343, PITTSBURGH, PA 15264-0343
PO BOX 640344, PITTSBURGH, PA 15264-0344
PO BOX 640345, PITTSBURGH, PA 15264-0345
PO BOX 640346, PITTSBURGH, PA 15264-0346
PO BOX 640347, PITTSBURGH, PA 15264-0347
PO BOX 640348, PITTSBURGH, PA 15264-0348
PO BOX 640349, PITTSBURGH, PA 15264-0349
PO BOX 640350, PITTSBURGH, PA 15264-0350
PO BOX 640351, PITTSBURGH, PA 15264-0351
PO BOX 640352, PITTSBURGH, PA 15264-0352
PO BOX 640353, PITTSBURGH, PA 15264-0353
PO BOX 640354, PITTSBURGH, PA 15264-0354
PO BOX 640355, PITTSBURGH, PA 15264-0355
PO BOX 640356, PITTSBURGH, PA 15264-0356
PO BOX 640357, PITTSBURGH, PA 15264-0357
PO BOX 640358, PITTSBURGH, PA 15264-0358
PO BOX 640359, PITTSBURGH, PA 15264-0359
PO BOX 640360, PITTSBURGH, PA 15264-0360
PO BOX 640361, PITTSBURGH, PA 15264-0361
PO BOX 640362, PITTSBURGH, PA 15264-0362
PO BOX 640363, PITTSBURGH, PA 15264-0363
PO BOX 640364, PITTSBURGH, PA 15264-0364
PO BOX 640365, PITTSBURGH, PA 15264-0365
PO BOX 640366, PITTSBURGH, PA 15264-0366
PO BOX 640367, PITTSBURGH, PA 15264-0367
PO BOX 640368, PITTSBURGH, PA 15264-0368
PO BOX 640369, PITTSBURGH, PA 15264-0369
PO BOX 640370, PITTSBURGH, PA 15264-0370
PO BOX 640371, PITTSBURGH, PA 15264-0371
PO BOX 640372, PITTSBURGH, PA 15264-0372
PO BOX 640373, PITTSBURGH, PA 15264-0373
PO BOX 640374, PITTSBURGH, PA 15264-0374
PO BOX 640375, PITTSBURGH, PA 15264-0375
PO BOX 640376, PITTSBURGH, PA 15264-0376
PO BOX 640377, PITTSBURGH, PA 15264-0377
PO BOX 640378, PITTSBURGH, PA 15264-0378
PO BOX 640379, PITTSBURGH, PA 15264-0379
PO BOX 640380, PITTSBURGH, PA 15264-0380
PO BOX 640381, PITTSBURGH, PA 15264-0381
PO BOX 640382, PITTSBURGH, PA 15264-0382
PO BOX 640383, PITTSBURGH, PA 15264-0383
PO BOX 640384, PITTSBURGH, PA 15264-0384
PO BOX 640385, PITTSBURGH, PA 15264-0385
PO BOX 640386, PITTSBURGH, PA 15264-0386
PO BOX 640387, PITTSBURGH, PA 15264-0387
PO BOX 640388, PITTSBURGH, PA 15264-0388
PO BOX 640389, PITTSBURGH, PA 15264-0389
PO BOX 640390, PITTSBURGH, PA 15264-0390
PO BOX 640391, PITTSBURGH, PA 15264-0391
PO BOX 640392, PITTSBURGH, PA 15264-0392
PO BOX 640393, PITTSBURGH, PA 15264-0393
PO BOX 640394, PITTSBURGH, PA 15264-0394
PO BOX 640395, PITTSBURGH, PA 15264-0395
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