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 5721, COLORADO SPRINGS, CO 80931-5721
PO BOX 5722, COLORADO SPRINGS, CO 80931-5722
PO BOX 5723, COLORADO SPRINGS, CO 80931-5723
PO BOX 5724, COLORADO SPRINGS, CO 80931-5724
PO BOX 5725, COLORADO SPRINGS, CO 80931-5725
PO BOX 5726, COLORADO SPRINGS, CO 80931-5726
PO BOX 5727, COLORADO SPRINGS, CO 80931-5727
PO BOX 5728, COLORADO SPRINGS, CO 80931-5728
PO BOX 5729, COLORADO SPRINGS, CO 80931-5729
PO BOX 5730, COLORADO SPRINGS, CO 80931-5730
PO BOX 5731, COLORADO SPRINGS, CO 80931-5731
PO BOX 5732, COLORADO SPRINGS, CO 80931-5732
PO BOX 5733, COLORADO SPRINGS, CO 80931-5733
PO BOX 5734, COLORADO SPRINGS, CO 80931-5734
PO BOX 5735, COLORADO SPRINGS, CO 80931-5735
PO BOX 5736, COLORADO SPRINGS, CO 80931-5736
PO BOX 5737, COLORADO SPRINGS, CO 80931-5737
PO BOX 5738, COLORADO SPRINGS, CO 80931-5738
PO BOX 5739, COLORADO SPRINGS, CO 80931-5739
PO BOX 5740, COLORADO SPRINGS, CO 80931-5740
PO BOX 5741, COLORADO SPRINGS, CO 80931-5741
PO BOX 5742, COLORADO SPRINGS, CO 80931-5742
PO BOX 5743, COLORADO SPRINGS, CO 80931-5743
PO BOX 5744, COLORADO SPRINGS, CO 80931-5744
PO BOX 5745, COLORADO SPRINGS, CO 80931-5745
PO BOX 5746, COLORADO SPRINGS, CO 80931-5746
PO BOX 5747, COLORADO SPRINGS, CO 80931-5747
PO BOX 5748, COLORADO SPRINGS, CO 80931-5748
PO BOX 5749, COLORADO SPRINGS, CO 80931-5749
PO BOX 5750, COLORADO SPRINGS, CO 80931-5750
PO BOX 5751, COLORADO SPRINGS, CO 80931-5751
PO BOX 5752, COLORADO SPRINGS, CO 80931-5752
PO BOX 5753, COLORADO SPRINGS, CO 80931-5753
PO BOX 5754, COLORADO SPRINGS, CO 80931-5754
PO BOX 5755, COLORADO SPRINGS, CO 80931-5755
PO BOX 5756, COLORADO SPRINGS, CO 80931-5756
PO BOX 5757, COLORADO SPRINGS, CO 80931-5757
PO BOX 5758, COLORADO SPRINGS, CO 80931-5758
PO BOX 5759, COLORADO SPRINGS, CO 80931-5759
PO BOX 5760, COLORADO SPRINGS, CO 80931-5760
PO BOX 5761, COLORADO SPRINGS, CO 80931-5761
PO BOX 5762, COLORADO SPRINGS, CO 80931-5762
PO BOX 5763, COLORADO SPRINGS, CO 80931-5763
PO BOX 5764, COLORADO SPRINGS, CO 80931-5764
PO BOX 5765, COLORADO SPRINGS, CO 80931-5765
PO BOX 5766, COLORADO SPRINGS, CO 80931-5766
PO BOX 5767, COLORADO SPRINGS, CO 80931-5767
PO BOX 5768, COLORADO SPRINGS, CO 80931-5768
PO BOX 5769, COLORADO SPRINGS, CO 80931-5769
PO BOX 5770, COLORADO SPRINGS, CO 80931-5770
PO BOX 5771, COLORADO SPRINGS, CO 80931-5771
PO BOX 5772, COLORADO SPRINGS, CO 80931-5772
PO BOX 5773, COLORADO SPRINGS, CO 80931-5773
PO BOX 5774, COLORADO SPRINGS, CO 80931-5774
PO BOX 5775, COLORADO SPRINGS, CO 80931-5775
PO BOX 5776, COLORADO SPRINGS, CO 80931-5776
PO BOX 5777, COLORADO SPRINGS, CO 80931-5777
PO BOX 5778, COLORADO SPRINGS, CO 80931-5778
PO BOX 5779, COLORADO SPRINGS, CO 80931-5779
PO BOX 5780, COLORADO SPRINGS, CO 80931-5780
PO BOX 5781, COLORADO SPRINGS, CO 80931-5781
PO BOX 5782, COLORADO SPRINGS, CO 80931-5782
PO BOX 5783, COLORADO SPRINGS, CO 80931-5783
PO BOX 5784, COLORADO SPRINGS, CO 80931-5784
PO BOX 5785, COLORADO SPRINGS, CO 80931-5785
PO BOX 5786, COLORADO SPRINGS, CO 80931-5786
PO BOX 5787, COLORADO SPRINGS, CO 80931-5787
PO BOX 5788, COLORADO SPRINGS, CO 80931-5788
PO BOX 5789, COLORADO SPRINGS, CO 80931-5789
PO BOX 5790, COLORADO SPRINGS, CO 80931-5790
PO BOX 5791, COLORADO SPRINGS, CO 80931-5791
PO BOX 5792, COLORADO SPRINGS, CO 80931-5792
PO BOX 5793, COLORADO SPRINGS, CO 80931-5793
PO BOX 5794, COLORADO SPRINGS, CO 80931-5794
PO BOX 5795, COLORADO SPRINGS, CO 80931-5795
PO BOX 5796, COLORADO SPRINGS, CO 80931-5796
PO BOX 5797, COLORADO SPRINGS, CO 80931-5797
PO BOX 5798, COLORADO SPRINGS, CO 80931-5798
PO BOX 5799, COLORADO SPRINGS, CO 80931-5799
PO BOX 5800, COLORADO SPRINGS, CO 80931-5800
PO BOX 5801, COLORADO SPRINGS, CO 80931-5801
PO BOX 5802, COLORADO SPRINGS, CO 80931-5802
PO BOX 5803, COLORADO SPRINGS, CO 80931-5803
PO BOX 5804, COLORADO SPRINGS, CO 80931-5804
PO BOX 5805, COLORADO SPRINGS, CO 80931-5805
PO BOX 5806, COLORADO SPRINGS, CO 80931-5806
PO BOX 5807, COLORADO SPRINGS, CO 80931-5807
PO BOX 5808, COLORADO SPRINGS, CO 80931-5808
PO BOX 5809, COLORADO SPRINGS, CO 80931-5809
PO BOX 5810, COLORADO SPRINGS, CO 80931-5810
PO BOX 5811, COLORADO SPRINGS, CO 80931-5811
PO BOX 5812, COLORADO SPRINGS, CO 80931-5812
PO BOX 5813, COLORADO SPRINGS, CO 80931-5813
PO BOX 5814, COLORADO SPRINGS, CO 80931-5814
PO BOX 5815, COLORADO SPRINGS, CO 80931-5815
PO BOX 5816, COLORADO SPRINGS, CO 80931-5816
PO BOX 5817, COLORADO SPRINGS, CO 80931-5817
PO BOX 5818, COLORADO SPRINGS, CO 80931-5818
PO BOX 5819, COLORADO SPRINGS, CO 80931-5819
PO BOX 5820, COLORADO SPRINGS, CO 80931-5820
PO BOX 5821, COLORADO SPRINGS, CO 80931-5821
PO BOX 5822, COLORADO SPRINGS, CO 80931-5822
PO BOX 5823, COLORADO SPRINGS, CO 80931-5823
PO BOX 5824, COLORADO SPRINGS, CO 80931-5824
PO BOX 5825, COLORADO SPRINGS, CO 80931-5825
PO BOX 5826, COLORADO SPRINGS, CO 80931-5826
PO BOX 5827, COLORADO SPRINGS, CO 80931-5827
PO BOX 5828, COLORADO SPRINGS, CO 80931-5828
PO BOX 5829, COLORADO SPRINGS, CO 80931-5829
PO BOX 5830, COLORADO SPRINGS, CO 80931-5830
PO BOX 5831, COLORADO SPRINGS, CO 80931-5831
PO BOX 5832, COLORADO SPRINGS, CO 80931-5832
PO BOX 5833, COLORADO SPRINGS, CO 80931-5833
PO BOX 5834, COLORADO SPRINGS, CO 80931-5834
PO BOX 5835, COLORADO SPRINGS, CO 80931-5835
PO BOX 5836, COLORADO SPRINGS, CO 80931-5836
PO BOX 5837, COLORADO SPRINGS, CO 80931-5837
PO BOX 5838, COLORADO SPRINGS, CO 80931-5838
PO BOX 5839, COLORADO SPRINGS, CO 80931-5839
PO BOX 5840, COLORADO SPRINGS, CO 80931-5840
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