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 5261, CAPITOL HEIGHTS, MD 20791-5261
PO BOX 5262, CAPITOL HEIGHTS, MD 20791-5262
PO BOX 5263, CAPITOL HEIGHTS, MD 20791-5263
PO BOX 5264, CAPITOL HEIGHTS, MD 20791-5264
PO BOX 5265, CAPITOL HEIGHTS, MD 20791-5265
PO BOX 5266, CAPITOL HEIGHTS, MD 20791-5266
PO BOX 5267, CAPITOL HEIGHTS, MD 20791-5267
PO BOX 5268, CAPITOL HEIGHTS, MD 20791-5268
PO BOX 5269, CAPITOL HEIGHTS, MD 20791-5269
PO BOX 5270, CAPITOL HEIGHTS, MD 20791-5270
PO BOX 5271, CAPITOL HEIGHTS, MD 20791-5271
PO BOX 5272, CAPITOL HEIGHTS, MD 20791-5272
PO BOX 5273, CAPITOL HEIGHTS, MD 20791-5273
PO BOX 5274, CAPITOL HEIGHTS, MD 20791-5274
PO BOX 5275, CAPITOL HEIGHTS, MD 20791-5275
PO BOX 5276, CAPITOL HEIGHTS, MD 20791-5276
PO BOX 5277, CAPITOL HEIGHTS, MD 20791-5277
PO BOX 5278, CAPITOL HEIGHTS, MD 20791-5278
PO BOX 5279, CAPITOL HEIGHTS, MD 20791-5279
PO BOX 5280, CAPITOL HEIGHTS, MD 20791-5280
PO BOX 5281, CAPITOL HEIGHTS, MD 20791-5281
PO BOX 5282, CAPITOL HEIGHTS, MD 20791-5282
PO BOX 5283, CAPITOL HEIGHTS, MD 20791-5283
PO BOX 5284, CAPITOL HEIGHTS, MD 20791-5284
PO BOX 5285, CAPITOL HEIGHTS, MD 20791-5285
PO BOX 5286, CAPITOL HEIGHTS, MD 20791-5286
PO BOX 5287, CAPITOL HEIGHTS, MD 20791-5287
PO BOX 5288, CAPITOL HEIGHTS, MD 20791-5288
PO BOX 5289, CAPITOL HEIGHTS, MD 20791-5289
PO BOX 5290, CAPITOL HEIGHTS, MD 20791-5290
PO BOX 5291, CAPITOL HEIGHTS, MD 20791-5291
PO BOX 5292, CAPITOL HEIGHTS, MD 20791-5292
PO BOX 5293, CAPITOL HEIGHTS, MD 20791-5293
PO BOX 5294, CAPITOL HEIGHTS, MD 20791-5294
PO BOX 5295, CAPITOL HEIGHTS, MD 20791-5295
PO BOX 5296, CAPITOL HEIGHTS, MD 20791-5296
PO BOX 5297, CAPITOL HEIGHTS, MD 20791-5297
PO BOX 5298, CAPITOL HEIGHTS, MD 20791-5298
PO BOX 5299, CAPITOL HEIGHTS, MD 20791-5299
PO BOX 5300, CAPITOL HEIGHTS, MD 20791-5300
PO BOX 5301, CAPITOL HEIGHTS, MD 20791-5301
PO BOX 5302, CAPITOL HEIGHTS, MD 20791-5302
PO BOX 5303, CAPITOL HEIGHTS, MD 20791-5303
PO BOX 5304, CAPITOL HEIGHTS, MD 20791-5304
PO BOX 5305, CAPITOL HEIGHTS, MD 20791-5305
PO BOX 5306, CAPITOL HEIGHTS, MD 20791-5306
PO BOX 5307, CAPITOL HEIGHTS, MD 20791-5307
PO BOX 5308, CAPITOL HEIGHTS, MD 20791-5308
PO BOX 5309, CAPITOL HEIGHTS, MD 20791-5309
PO BOX 5310, CAPITOL HEIGHTS, MD 20791-5310
PO BOX 5311, CAPITOL HEIGHTS, MD 20791-5311
PO BOX 5312, CAPITOL HEIGHTS, MD 20791-5312
PO BOX 5313, CAPITOL HEIGHTS, MD 20791-5313
PO BOX 5314, CAPITOL HEIGHTS, MD 20791-5314
PO BOX 5315, CAPITOL HEIGHTS, MD 20791-5315
PO BOX 5316, CAPITOL HEIGHTS, MD 20791-5316
PO BOX 5317, CAPITOL HEIGHTS, MD 20791-5317
PO BOX 5318, CAPITOL HEIGHTS, MD 20791-5318
PO BOX 5319, CAPITOL HEIGHTS, MD 20791-5319
PO BOX 5320, CAPITOL HEIGHTS, MD 20791-5320
PO BOX 5321, CAPITOL HEIGHTS, MD 20791-5321
PO BOX 5322, CAPITOL HEIGHTS, MD 20791-5322
PO BOX 5323, CAPITOL HEIGHTS, MD 20791-5323
PO BOX 5324, CAPITOL HEIGHTS, MD 20791-5324
PO BOX 5325, CAPITOL HEIGHTS, MD 20791-5325
PO BOX 5326, CAPITOL HEIGHTS, MD 20791-5326
PO BOX 5327, CAPITOL HEIGHTS, MD 20791-5327
PO BOX 5328, CAPITOL HEIGHTS, MD 20791-5328
PO BOX 5329, CAPITOL HEIGHTS, MD 20791-5329
PO BOX 5330, CAPITOL HEIGHTS, MD 20791-5330
PO BOX 5331, CAPITOL HEIGHTS, MD 20791-5331
PO BOX 5332, CAPITOL HEIGHTS, MD 20791-5332
PO BOX 5333, CAPITOL HEIGHTS, MD 20791-5333
PO BOX 5334, CAPITOL HEIGHTS, MD 20791-5334
PO BOX 5335, CAPITOL HEIGHTS, MD 20791-5335
PO BOX 5336, CAPITOL HEIGHTS, MD 20791-5336
PO BOX 5337, CAPITOL HEIGHTS, MD 20791-5337
PO BOX 5338, CAPITOL HEIGHTS, MD 20791-5338
PO BOX 5339, CAPITOL HEIGHTS, MD 20791-5339
PO BOX 5340, CAPITOL HEIGHTS, MD 20791-5340
PO BOX 5341, CAPITOL HEIGHTS, MD 20791-5341
PO BOX 5342, CAPITOL HEIGHTS, MD 20791-5342
PO BOX 5343, CAPITOL HEIGHTS, MD 20791-5343
PO BOX 5344, CAPITOL HEIGHTS, MD 20791-5344
PO BOX 5345, CAPITOL HEIGHTS, MD 20791-5345
PO BOX 5346, CAPITOL HEIGHTS, MD 20791-5346
PO BOX 5347, CAPITOL HEIGHTS, MD 20791-5347
PO BOX 5348, CAPITOL HEIGHTS, MD 20791-5348
PO BOX 5349, CAPITOL HEIGHTS, MD 20791-5349
PO BOX 5350, CAPITOL HEIGHTS, MD 20791-5350
PO BOX 5351, CAPITOL HEIGHTS, MD 20791-5351
PO BOX 5352, CAPITOL HEIGHTS, MD 20791-5352
PO BOX 5353, CAPITOL HEIGHTS, MD 20791-5353
PO BOX 5354, CAPITOL HEIGHTS, MD 20791-5354
PO BOX 5355, CAPITOL HEIGHTS, MD 20791-5355
PO BOX 5356, CAPITOL HEIGHTS, MD 20791-5356
PO BOX 5357, CAPITOL HEIGHTS, MD 20791-5357
PO BOX 5358, CAPITOL HEIGHTS, MD 20791-5358
PO BOX 5359, CAPITOL HEIGHTS, MD 20791-5359
PO BOX 5360, CAPITOL HEIGHTS, MD 20791-5360
PO BOX 5361, CAPITOL HEIGHTS, MD 20791-5361
PO BOX 5362, CAPITOL HEIGHTS, MD 20791-5362
PO BOX 5363, CAPITOL HEIGHTS, MD 20791-5363
PO BOX 5364, CAPITOL HEIGHTS, MD 20791-5364
PO BOX 5365, CAPITOL HEIGHTS, MD 20791-5365
PO BOX 5366, CAPITOL HEIGHTS, MD 20791-5366
PO BOX 5367, CAPITOL HEIGHTS, MD 20791-5367
PO BOX 5368, CAPITOL HEIGHTS, MD 20791-5368
PO BOX 5369, CAPITOL HEIGHTS, MD 20791-5369
PO BOX 5370, CAPITOL HEIGHTS, MD 20791-5370
PO BOX 5371, CAPITOL HEIGHTS, MD 20791-5371
PO BOX 5372, CAPITOL HEIGHTS, MD 20791-5372
PO BOX 5373, CAPITOL HEIGHTS, MD 20791-5373
PO BOX 5374, CAPITOL HEIGHTS, MD 20791-5374
PO BOX 5375, CAPITOL HEIGHTS, MD 20791-5375
PO BOX 5376, CAPITOL HEIGHTS, MD 20791-5376
PO BOX 5377, CAPITOL HEIGHTS, MD 20791-5377
PO BOX 5378, CAPITOL HEIGHTS, MD 20791-5378
PO BOX 5379, CAPITOL HEIGHTS, MD 20791-5379
PO BOX 5380, CAPITOL HEIGHTS, MD 20791-5380
PO BOX 5381, CAPITOL HEIGHTS, MD 20791-5381
PO BOX 5382, CAPITOL HEIGHTS, MD 20791-5382
PO BOX 5383, CAPITOL HEIGHTS, MD 20791-5383
PO BOX 5384, CAPITOL HEIGHTS, MD 20791-5384
PO BOX 5385, CAPITOL HEIGHTS, MD 20791-5385
PO BOX 5386, CAPITOL HEIGHTS, MD 20791-5386
PO BOX 5387, CAPITOL HEIGHTS, MD 20791-5387
PO BOX 5388, CAPITOL HEIGHTS, MD 20791-5388
PO BOX 5389, CAPITOL HEIGHTS, MD 20791-5389
PO BOX 5390, CAPITOL HEIGHTS, MD 20791-5390
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