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 11001, HICKORY, NC 28603-4501
PO BOX 11002, HICKORY, NC 28603-4502
PO BOX 11003, HICKORY, NC 28603-4503
PO BOX 11004, HICKORY, NC 28603-4504
PO BOX 11005, HICKORY, NC 28603-4505
PO BOX 11006, HICKORY, NC 28603-4506
PO BOX 11007, HICKORY, NC 28603-4507
PO BOX 11008, HICKORY, NC 28603-4508
PO BOX 11009, HICKORY, NC 28603-4509
PO BOX 11010, HICKORY, NC 28603-4510
PO BOX 11011, HICKORY, NC 28603-4511
PO BOX 11012, HICKORY, NC 28603-4512
PO BOX 11013, HICKORY, NC 28603-4513
PO BOX 11014, HICKORY, NC 28603-4514
PO BOX 11015, HICKORY, NC 28603-4515
PO BOX 11016, HICKORY, NC 28603-4516
PO BOX 11017, HICKORY, NC 28603-4517
PO BOX 11018, HICKORY, NC 28603-4518
PO BOX 11019, HICKORY, NC 28603-4519
PO BOX 11020, HICKORY, NC 28603-4520
PO BOX 11021, HICKORY, NC 28603-4521
PO BOX 11022, HICKORY, NC 28603-4522
PO BOX 11023, HICKORY, NC 28603-4523
PO BOX 11024, HICKORY, NC 28603-4524
PO BOX 11025, HICKORY, NC 28603-4525
PO BOX 11026, HICKORY, NC 28603-4526
PO BOX 11027, HICKORY, NC 28603-4527
PO BOX 11028, HICKORY, NC 28603-4528
PO BOX 11029, HICKORY, NC 28603-4529
PO BOX 11030, HICKORY, NC 28603-4530
PO BOX 11031, HICKORY, NC 28603-4531
PO BOX 11032, HICKORY, NC 28603-4532
PO BOX 11033, HICKORY, NC 28603-4533
PO BOX 11034, HICKORY, NC 28603-4534
PO BOX 11035, HICKORY, NC 28603-4535
PO BOX 11036, HICKORY, NC 28603-4536
PO BOX 11037, HICKORY, NC 28603-4537
PO BOX 11038, HICKORY, NC 28603-4538
PO BOX 11039, HICKORY, NC 28603-4539
PO BOX 11040, HICKORY, NC 28603-4540
PO BOX 11041, HICKORY, NC 28603-4541
PO BOX 11042, HICKORY, NC 28603-4542
PO BOX 11043, HICKORY, NC 28603-4543
PO BOX 11044, HICKORY, NC 28603-4544
PO BOX 11045, HICKORY, NC 28603-4545
PO BOX 11046, HICKORY, NC 28603-4546
PO BOX 11047, HICKORY, NC 28603-4547
PO BOX 11048, HICKORY, NC 28603-4548
PO BOX 11049, HICKORY, NC 28603-4549
PO BOX 11050, HICKORY, NC 28603-4550
PO BOX 11051, HICKORY, NC 28603-4551
PO BOX 11052, HICKORY, NC 28603-4552
PO BOX 11053, HICKORY, NC 28603-4553
PO BOX 11054, HICKORY, NC 28603-4554
PO BOX 11055, HICKORY, NC 28603-4555
PO BOX 11056, HICKORY, NC 28603-4556
PO BOX 11057, HICKORY, NC 28603-4557
PO BOX 11058, HICKORY, NC 28603-4558
PO BOX 11059, HICKORY, NC 28603-4559
PO BOX 11060, HICKORY, NC 28603-4560
PO BOX 11061, HICKORY, NC 28603-4561
PO BOX 11062, HICKORY, NC 28603-4562
PO BOX 11063, HICKORY, NC 28603-4563
PO BOX 11064, HICKORY, NC 28603-4564
PO BOX 11065, HICKORY, NC 28603-4565
PO BOX 11066, HICKORY, NC 28603-4566
PO BOX 11067, HICKORY, NC 28603-4567
PO BOX 11068, HICKORY, NC 28603-4568
PO BOX 11069, HICKORY, NC 28603-4569
PO BOX 11070, HICKORY, NC 28603-4570
PO BOX 11071, HICKORY, NC 28603-4571
PO BOX 11072, HICKORY, NC 28603-4572
PO BOX 11073, HICKORY, NC 28603-4573
PO BOX 11074, HICKORY, NC 28603-4574
PO BOX 11075, HICKORY, NC 28603-4575
PO BOX 11076, HICKORY, NC 28603-4576
PO BOX 11077, HICKORY, NC 28603-4577
PO BOX 11078, HICKORY, NC 28603-4578
PO BOX 11079, HICKORY, NC 28603-4579
PO BOX 11080, HICKORY, NC 28603-4580
PO BOX 11081, HICKORY, NC 28603-4581
PO BOX 11082, HICKORY, NC 28603-4582
PO BOX 11083, HICKORY, NC 28603-4583
PO BOX 11084, HICKORY, NC 28603-4584
PO BOX 11085, HICKORY, NC 28603-4585
PO BOX 11086, HICKORY, NC 28603-4586
PO BOX 11087, HICKORY, NC 28603-4587
PO BOX 11088, HICKORY, NC 28603-4588
PO BOX 11089, HICKORY, NC 28603-4589
PO BOX 11090, HICKORY, NC 28603-4590
PO BOX 11091, HICKORY, NC 28603-4591
PO BOX 11092, HICKORY, NC 28603-4592
PO BOX 11093, HICKORY, NC 28603-4593
PO BOX 11094, HICKORY, NC 28603-4594
PO BOX 11095, HICKORY, NC 28603-4595
PO BOX 11096, HICKORY, NC 28603-4596
PO BOX 11097, HICKORY, NC 28603-4597
PO BOX 11098, HICKORY, NC 28603-4598
PO BOX 11099, HICKORY, NC 28603-4599
PO BOX 11100, HICKORY, NC 28603-4600
PO BOX 11101, HICKORY, NC 28603-4601
PO BOX 11102, HICKORY, NC 28603-4602
PO BOX 11103, HICKORY, NC 28603-4603
PO BOX 11104, HICKORY, NC 28603-4604
PO BOX 11105, HICKORY, NC 28603-4605
PO BOX 11106, HICKORY, NC 28603-4606
PO BOX 11107, HICKORY, NC 28603-4607
PO BOX 11108, HICKORY, NC 28603-4608
PO BOX 11109, HICKORY, NC 28603-4609
PO BOX 11110, HICKORY, NC 28603-4610
PO BOX 11111, HICKORY, NC 28603-4611
PO BOX 11112, HICKORY, NC 28603-4612
PO BOX 11113, HICKORY, NC 28603-4613
PO BOX 11114, HICKORY, NC 28603-4614
PO BOX 11115, HICKORY, NC 28603-4615
PO BOX 11116, HICKORY, NC 28603-4616
PO BOX 11117, HICKORY, NC 28603-4617
PO BOX 11118, HICKORY, NC 28603-4618
PO BOX 11119, HICKORY, NC 28603-4619
PO BOX 11120, HICKORY, NC 28603-4620
PO BOX 11121, HICKORY, NC 28603-4621
PO BOX 11122, HICKORY, NC 28603-4622
PO BOX 11123, HICKORY, NC 28603-4623
PO BOX 11124, HICKORY, NC 28603-4624
PO BOX 11125, HICKORY, NC 28603-4625
PO BOX 11126, HICKORY, NC 28603-4626
PO BOX 11127, HICKORY, NC 28603-4627
PO BOX 11128, HICKORY, NC 28603-4628
PO BOX 11129, HICKORY, NC 28603-4629
PO BOX 11130, HICKORY, NC 28603-4630
PO BOX 11131, HICKORY, NC 28603-4631
PO BOX 11132, HICKORY, NC 28603-4632
PO BOX 11133, HICKORY, NC 28603-4633
PO BOX 11134, HICKORY, NC 28603-4634
PO BOX 11135, HICKORY, NC 28603-4635
PO BOX 11136, HICKORY, NC 28603-4636
PO BOX 11137, HICKORY, NC 28603-4637
PO BOX 11138, HICKORY, NC 28603-4638
PO BOX 11139, HICKORY, NC 28603-4639
PO BOX 11140, HICKORY, NC 28603-4640
PO BOX 11141, HICKORY, NC 28603-4641
PO BOX 11142, HICKORY, NC 28603-4642
PO BOX 11143, HICKORY, NC 28603-4643
PO BOX 11144, HICKORY, NC 28603-4644
PO BOX 11145, HICKORY, NC 28603-4645
PO BOX 11146, HICKORY, NC 28603-4646
PO BOX 11147, HICKORY, NC 28603-4647
PO BOX 11148, HICKORY, NC 28603-4648
PO BOX 11149, HICKORY, NC 28603-4649
PO BOX 11150, HICKORY, NC 28603-4650
PO BOX 11151, HICKORY, NC 28603-4651
PO BOX 11152, HICKORY, NC 28603-4652
PO BOX 11153, HICKORY, NC 28603-4653
PO BOX 11154, HICKORY, NC 28603-4654
PO BOX 11155, HICKORY, NC 28603-4655
PO BOX 11156, HICKORY, NC 28603-4656
PO BOX 11157, HICKORY, NC 28603-4657
PO BOX 11158, HICKORY, NC 28603-4658
PO BOX 11159, HICKORY, NC 28603-4659
PO BOX 11160, HICKORY, NC 28603-4660
PO BOX 11161, HICKORY, NC 28603-4661
PO BOX 11162, HICKORY, NC 28603-4662
PO BOX 11163, HICKORY, NC 28603-4663
PO BOX 11164, HICKORY, NC 28603-4664
PO BOX 11165, HICKORY, NC 28603-4665
PO BOX 11166, HICKORY, NC 28603-4666
PO BOX 11167, HICKORY, NC 28603-4667
PO BOX 11168, HICKORY, NC 28603-4668
PO BOX 11169, HICKORY, NC 28603-4669
PO BOX 11170, HICKORY, NC 28603-4670
PO BOX 11171, HICKORY, NC 28603-4671
PO BOX 11172, HICKORY, NC 28603-4672
PO BOX 11173, HICKORY, NC 28603-4673
PO BOX 11174, HICKORY, NC 28603-4674
PO BOX 11175, HICKORY, NC 28603-4675
PO BOX 11176, HICKORY, NC 28603-4676
PO BOX 11177, HICKORY, NC 28603-4677
PO BOX 11178, HICKORY, NC 28603-4678
PO BOX 11179, HICKORY, NC 28603-4679
PO BOX 11180, HICKORY, NC 28603-4680
PO BOX 11181, HICKORY, NC 28603-4681
PO BOX 11182, HICKORY, NC 28603-4682
PO BOX 11183, HICKORY, NC 28603-4683
PO BOX 11184, HICKORY, NC 28603-4684
PO BOX 11185, HICKORY, NC 28603-4685
PO BOX 11186, HICKORY, NC 28603-4686
PO BOX 11187, HICKORY, NC 28603-4687
PO BOX 11188, HICKORY, NC 28603-4688
PO BOX 11189, HICKORY, NC 28603-4689
PO BOX 11190, HICKORY, NC 28603-4690
PO BOX 11191, HICKORY, NC 28603-4691
PO BOX 11192, HICKORY, NC 28603-4692
PO BOX 11193, HICKORY, NC 28603-4693
PO BOX 11194, HICKORY, NC 28603-4694
PO BOX 11195, HICKORY, NC 28603-4695
PO BOX 11196, HICKORY, NC 28603-4696
PO BOX 11197, HICKORY, NC 28603-4697
PO BOX 11198, HICKORY, NC 28603-4698
PO BOX 11199, HICKORY, NC 28603-4699
PO BOX 11200, HICKORY, NC 28603-4700
PO BOX 11201, HICKORY, NC 28603-4701
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