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 4121, ROCKFORD, IL 61110-0621
PO BOX 4122, ROCKFORD, IL 61110-0622
PO BOX 4123, ROCKFORD, IL 61110-0623
PO BOX 4124, ROCKFORD, IL 61110-0624
PO BOX 4125, ROCKFORD, IL 61110-0625
PO BOX 4126, ROCKFORD, IL 61110-0626
PO BOX 4127, ROCKFORD, IL 61110-0627
PO BOX 4128, ROCKFORD, IL 61110-0628
PO BOX 4129, ROCKFORD, IL 61110-0629
PO BOX 4130, ROCKFORD, IL 61110-0630
PO BOX 4131, ROCKFORD, IL 61110-0631
PO BOX 4132, ROCKFORD, IL 61110-0632
PO BOX 4133, ROCKFORD, IL 61110-0633
PO BOX 4134, ROCKFORD, IL 61110-0634
PO BOX 4135, ROCKFORD, IL 61110-0635
PO BOX 4136, ROCKFORD, IL 61110-0636
PO BOX 4137, ROCKFORD, IL 61110-0637
PO BOX 4138, ROCKFORD, IL 61110-0638
PO BOX 4139, ROCKFORD, IL 61110-0639
PO BOX 4140, ROCKFORD, IL 61110-0640
PO BOX 4141, ROCKFORD, IL 61110-0641
PO BOX 4142, ROCKFORD, IL 61110-0642
PO BOX 4143, ROCKFORD, IL 61110-0643
PO BOX 4144, ROCKFORD, IL 61110-0644
PO BOX 4145, ROCKFORD, IL 61110-0645
PO BOX 4146, ROCKFORD, IL 61110-0646
PO BOX 4147, ROCKFORD, IL 61110-0647
PO BOX 4148, ROCKFORD, IL 61110-0648
PO BOX 4149, ROCKFORD, IL 61110-0649
PO BOX 4150, ROCKFORD, IL 61110-0650
PO BOX 4151, ROCKFORD, IL 61110-0651
PO BOX 4152, ROCKFORD, IL 61110-0652
PO BOX 4153, ROCKFORD, IL 61110-0653
PO BOX 4154, ROCKFORD, IL 61110-0654
PO BOX 4155, ROCKFORD, IL 61110-0655
PO BOX 4156, ROCKFORD, IL 61110-0656
PO BOX 4157, ROCKFORD, IL 61110-0657
PO BOX 4158, ROCKFORD, IL 61110-0658
PO BOX 4159, ROCKFORD, IL 61110-0659
PO BOX 4160, ROCKFORD, IL 61110-0660
PO BOX 4161, ROCKFORD, IL 61110-0661
PO BOX 4162, ROCKFORD, IL 61110-0662
PO BOX 4163, ROCKFORD, IL 61110-0663
PO BOX 4164, ROCKFORD, IL 61110-0664
PO BOX 4165, ROCKFORD, IL 61110-0665
PO BOX 4166, ROCKFORD, IL 61110-0666
PO BOX 4167, ROCKFORD, IL 61110-0667
PO BOX 4168, ROCKFORD, IL 61110-0668
PO BOX 4169, ROCKFORD, IL 61110-0669
PO BOX 4170, ROCKFORD, IL 61110-0670
PO BOX 4171, ROCKFORD, IL 61110-0671
PO BOX 4172, ROCKFORD, IL 61110-0672
PO BOX 4173, ROCKFORD, IL 61110-0673
PO BOX 4174, ROCKFORD, IL 61110-0674
PO BOX 4175, ROCKFORD, IL 61110-0675
PO BOX 4176, ROCKFORD, IL 61110-0676
PO BOX 4177, ROCKFORD, IL 61110-0677
PO BOX 4178, ROCKFORD, IL 61110-0678
PO BOX 4179, ROCKFORD, IL 61110-0679
PO BOX 4180, ROCKFORD, IL 61110-0680
PO BOX 4181, ROCKFORD, IL 61110-0681
PO BOX 4182, ROCKFORD, IL 61110-0682
PO BOX 4183, ROCKFORD, IL 61110-0683
PO BOX 4184, ROCKFORD, IL 61110-0684
PO BOX 4185, ROCKFORD, IL 61110-0685
PO BOX 4186, ROCKFORD, IL 61110-0686
PO BOX 4187, ROCKFORD, IL 61110-0687
PO BOX 4188, ROCKFORD, IL 61110-0688
PO BOX 4189, ROCKFORD, IL 61110-0689
PO BOX 4190, ROCKFORD, IL 61110-0690
PO BOX 4191, ROCKFORD, IL 61110-0691
PO BOX 4192, ROCKFORD, IL 61110-0692
PO BOX 4193, ROCKFORD, IL 61110-0693
PO BOX 4194, ROCKFORD, IL 61110-0694
PO BOX 4195, ROCKFORD, IL 61110-0695
PO BOX 4196, ROCKFORD, IL 61110-0696
PO BOX 4197, ROCKFORD, IL 61110-0697
PO BOX 4198, ROCKFORD, IL 61110-0698
PO BOX 4199, ROCKFORD, IL 61110-0699
PO BOX 4200, ROCKFORD, IL 61110-0700
PO BOX 4201, ROCKFORD, IL 61110-0701
PO BOX 4202, ROCKFORD, IL 61110-0702
PO BOX 4203, ROCKFORD, IL 61110-0703
PO BOX 4204, ROCKFORD, IL 61110-0704
PO BOX 4205, ROCKFORD, IL 61110-0705
PO BOX 4206, ROCKFORD, IL 61110-0706
PO BOX 4207, ROCKFORD, IL 61110-0707
PO BOX 4208, ROCKFORD, IL 61110-0708
PO BOX 4209, ROCKFORD, IL 61110-0709
PO BOX 4210, ROCKFORD, IL 61110-0710
PO BOX 4211, ROCKFORD, IL 61110-0711
PO BOX 4212, ROCKFORD, IL 61110-0712
PO BOX 4213, ROCKFORD, IL 61110-0713
PO BOX 4214, ROCKFORD, IL 61110-0714
PO BOX 4215, ROCKFORD, IL 61110-0715
PO BOX 4216, ROCKFORD, IL 61110-0716
PO BOX 4217, ROCKFORD, IL 61110-0717
PO BOX 4218, ROCKFORD, IL 61110-0718
PO BOX 4219, ROCKFORD, IL 61110-0719
PO BOX 4220, ROCKFORD, IL 61110-0720
PO BOX 4221, ROCKFORD, IL 61110-0721
PO BOX 4222, ROCKFORD, IL 61110-0722
PO BOX 4223, ROCKFORD, IL 61110-0723
PO BOX 4224, ROCKFORD, IL 61110-0724
PO BOX 4225, ROCKFORD, IL 61110-0725
PO BOX 4226, ROCKFORD, IL 61110-0726
PO BOX 4227, ROCKFORD, IL 61110-0727
PO BOX 4228, ROCKFORD, IL 61110-0728
PO BOX 4229, ROCKFORD, IL 61110-0729
PO BOX 4230, ROCKFORD, IL 61110-0730
PO BOX 4231, ROCKFORD, IL 61110-0731
PO BOX 4232, ROCKFORD, IL 61110-0732
PO BOX 4233, ROCKFORD, IL 61110-0733
PO BOX 4234, ROCKFORD, IL 61110-0734
PO BOX 4235, ROCKFORD, IL 61110-0735
PO BOX 4236, ROCKFORD, IL 61110-0736
PO BOX 4237, ROCKFORD, IL 61110-0737
PO BOX 4238, ROCKFORD, IL 61110-0738
PO BOX 4239, ROCKFORD, IL 61110-0739
PO BOX 4240, ROCKFORD, IL 61110-0740
PO BOX 4241, ROCKFORD, IL 61110-0741
PO BOX 4242, ROCKFORD, IL 61110-0742
PO BOX 4243, ROCKFORD, IL 61110-0743
PO BOX 4244, ROCKFORD, IL 61110-0744
PO BOX 4245, ROCKFORD, IL 61110-0745
PO BOX 4246, ROCKFORD, IL 61110-0746
PO BOX 4247, ROCKFORD, IL 61110-0747
PO BOX 4248, ROCKFORD, IL 61110-0748
PO BOX 4249, ROCKFORD, IL 61110-0749
PO BOX 4250, ROCKFORD, IL 61110-0750
PO BOX 4251, ROCKFORD, IL 61110-0751
PO BOX 4252, ROCKFORD, IL 61110-0752
PO BOX 4253, ROCKFORD, IL 61110-0753
PO BOX 4254, ROCKFORD, IL 61110-0754
PO BOX 4255, ROCKFORD, IL 61110-0755
PO BOX 4256, ROCKFORD, IL 61110-0756
PO BOX 4257, ROCKFORD, IL 61110-0757
PO BOX 4258, ROCKFORD, IL 61110-0758
PO BOX 4259, ROCKFORD, IL 61110-0759
PO BOX 4260, ROCKFORD, IL 61110-0760
PO BOX 4261, ROCKFORD, IL 61110-0761
PO BOX 4262, ROCKFORD, IL 61110-0762
PO BOX 4263, ROCKFORD, IL 61110-0763
PO BOX 4264, ROCKFORD, IL 61110-0764
PO BOX 4265, ROCKFORD, IL 61110-0765
PO BOX 4266, ROCKFORD, IL 61110-0766
PO BOX 4267, ROCKFORD, IL 61110-0767
PO BOX 4268, ROCKFORD, IL 61110-0768
PO BOX 4269, ROCKFORD, IL 61110-0769
PO BOX 4270, ROCKFORD, IL 61110-0770
PO BOX 4271, ROCKFORD, IL 61110-0771
PO BOX 4272, ROCKFORD, IL 61110-0772
PO BOX 4273, ROCKFORD, IL 61110-0773
PO BOX 4274, ROCKFORD, IL 61110-0774
PO BOX 4275, ROCKFORD, IL 61110-0775
PO BOX 4276, ROCKFORD, IL 61110-0776
PO BOX 4277, ROCKFORD, IL 61110-0777
PO BOX 4278, ROCKFORD, IL 61110-0778
PO BOX 4279, ROCKFORD, IL 61110-0779
PO BOX 4280, ROCKFORD, IL 61110-0780
PO BOX 4281, ROCKFORD, IL 61110-0781
PO BOX 4282, ROCKFORD, IL 61110-0782
PO BOX 4283, ROCKFORD, IL 61110-0783
PO BOX 4284, ROCKFORD, IL 61110-0784
PO BOX 4285, ROCKFORD, IL 61110-0785
PO BOX 4286, ROCKFORD, IL 61110-0786
PO BOX 4287, ROCKFORD, IL 61110-0787
PO BOX 4288, ROCKFORD, IL 61110-0788
PO BOX 4289, ROCKFORD, IL 61110-0789
PO BOX 4290, ROCKFORD, IL 61110-0790
PO BOX 4291, ROCKFORD, IL 61110-0791
PO BOX 4292, ROCKFORD, IL 61110-0792
PO BOX 4293, ROCKFORD, IL 61110-0793
PO BOX 4294, ROCKFORD, IL 61110-0794
PO BOX 4295, ROCKFORD, IL 61110-0795
PO BOX 4296, ROCKFORD, IL 61110-0796
PO BOX 4297, ROCKFORD, IL 61110-0797
PO BOX 4298, ROCKFORD, IL 61110-0798
PO BOX 4299, ROCKFORD, IL 61110-0799
PO BOX 4300, ROCKFORD, IL 61110-0800
PO BOX 4301, ROCKFORD, IL 61110-0801
PO BOX 4302, ROCKFORD, IL 61110-0802
PO BOX 4303, ROCKFORD, IL 61110-0803
PO BOX 4304, ROCKFORD, IL 61110-0804
PO BOX 4305, ROCKFORD, IL 61110-0805
PO BOX 4306, ROCKFORD, IL 61110-0806
PO BOX 4307, ROCKFORD, IL 61110-0807
PO BOX 4308, ROCKFORD, IL 61110-0808
PO BOX 4309, ROCKFORD, IL 61110-0809
PO BOX 4310, ROCKFORD, IL 61110-0810
PO BOX 4311, ROCKFORD, IL 61110-0811
PO BOX 4312, ROCKFORD, IL 61110-0812
PO BOX 4313, ROCKFORD, IL 61110-0813
PO BOX 4314, ROCKFORD, IL 61110-0814
PO BOX 4315, ROCKFORD, IL 61110-0815
PO BOX 4316, ROCKFORD, IL 61110-0816
PO BOX 4317, ROCKFORD, IL 61110-0817
PO BOX 4318, ROCKFORD, IL 61110-0818
PO BOX 4319, ROCKFORD, IL 61110-0819
PO BOX 4320, ROCKFORD, IL 61110-0820
PO BOX 4321, ROCKFORD, IL 61110-0821
Add new comment