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 16651, SANTA BARBARA, CA 93107-6651
PO BOX 16652, SANTA BARBARA, CA 93107-6652
PO BOX 16653, SANTA BARBARA, CA 93107-6653
PO BOX 16654, SANTA BARBARA, CA 93107-6654
PO BOX 16655, SANTA BARBARA, CA 93107-6655
PO BOX 16656, SANTA BARBARA, CA 93107-6656
PO BOX 16657, SANTA BARBARA, CA 93107-6657
PO BOX 16658, SANTA BARBARA, CA 93107-6658
PO BOX 16659, SANTA BARBARA, CA 93107-6659
PO BOX 16660, SANTA BARBARA, CA 93107-6660
PO BOX 16661, SANTA BARBARA, CA 93107-6661
PO BOX 16662, SANTA BARBARA, CA 93107-6662
PO BOX 16663, SANTA BARBARA, CA 93107-6663
PO BOX 16664, SANTA BARBARA, CA 93107-6664
PO BOX 16665, SANTA BARBARA, CA 93107-6665
PO BOX 16666, SANTA BARBARA, CA 93107-6666
PO BOX 16667, SANTA BARBARA, CA 93107-6667
PO BOX 16668, SANTA BARBARA, CA 93107-6668
PO BOX 16669, SANTA BARBARA, CA 93107-6669
PO BOX 16670, SANTA BARBARA, CA 93107-6670
PO BOX 16671, SANTA BARBARA, CA 93107-6671
PO BOX 16672, SANTA BARBARA, CA 93107-6672
PO BOX 16673, SANTA BARBARA, CA 93107-6673
PO BOX 16674, SANTA BARBARA, CA 93107-6674
PO BOX 16675, SANTA BARBARA, CA 93107-6675
PO BOX 16676, SANTA BARBARA, CA 93107-6676
PO BOX 16677, SANTA BARBARA, CA 93107-6677
PO BOX 16678, SANTA BARBARA, CA 93107-6678
PO BOX 16679, SANTA BARBARA, CA 93107-6679
PO BOX 16680, SANTA BARBARA, CA 93107-6680
PO BOX 16681, SANTA BARBARA, CA 93107-6681
PO BOX 16682, SANTA BARBARA, CA 93107-6682
PO BOX 16683, SANTA BARBARA, CA 93107-6683
PO BOX 16684, SANTA BARBARA, CA 93107-6684
PO BOX 16685, SANTA BARBARA, CA 93107-6685
PO BOX 16686, SANTA BARBARA, CA 93107-6686
PO BOX 16687, SANTA BARBARA, CA 93107-6687
PO BOX 16688, SANTA BARBARA, CA 93107-6688
PO BOX 16689, SANTA BARBARA, CA 93107-6689
PO BOX 16690, SANTA BARBARA, CA 93107-6690
PO BOX 16691, SANTA BARBARA, CA 93107-6691
PO BOX 16692, SANTA BARBARA, CA 93107-6692
PO BOX 16693, SANTA BARBARA, CA 93107-6693
PO BOX 16694, SANTA BARBARA, CA 93107-6694
PO BOX 16695, SANTA BARBARA, CA 93107-6695
PO BOX 16696, SANTA BARBARA, CA 93107-6696
PO BOX 16697, SANTA BARBARA, CA 93107-6697
PO BOX 16698, SANTA BARBARA, CA 93107-6698
PO BOX 16699, SANTA BARBARA, CA 93107-6699
PO BOX 16700, SANTA BARBARA, CA 93107-6700
PO BOX 16701, SANTA BARBARA, CA 93107-6701
PO BOX 16702, SANTA BARBARA, CA 93107-6702
PO BOX 16703, SANTA BARBARA, CA 93107-6703
PO BOX 16704, SANTA BARBARA, CA 93107-6704
PO BOX 16705, SANTA BARBARA, CA 93107-6705
PO BOX 16706, SANTA BARBARA, CA 93107-6706
PO BOX 16707, SANTA BARBARA, CA 93107-6707
PO BOX 16708, SANTA BARBARA, CA 93107-6708
PO BOX 16709, SANTA BARBARA, CA 93107-6709
PO BOX 16710, SANTA BARBARA, CA 93107-6710
PO BOX 16711, SANTA BARBARA, CA 93107-6711
PO BOX 16712, SANTA BARBARA, CA 93107-6712
PO BOX 16713, SANTA BARBARA, CA 93107-6713
PO BOX 16714, SANTA BARBARA, CA 93107-6714
PO BOX 16715, SANTA BARBARA, CA 93107-6715
PO BOX 16716, SANTA BARBARA, CA 93107-6716
PO BOX 16717, SANTA BARBARA, CA 93107-6717
PO BOX 16718, SANTA BARBARA, CA 93107-6718
PO BOX 16719, SANTA BARBARA, CA 93107-6719
PO BOX 16720, SANTA BARBARA, CA 93107-6720
PO BOX 16721, SANTA BARBARA, CA 93107-6721
PO BOX 16722, SANTA BARBARA, CA 93107-6722
PO BOX 16723, SANTA BARBARA, CA 93107-6723
PO BOX 16724, SANTA BARBARA, CA 93107-6724
PO BOX 16725, SANTA BARBARA, CA 93107-6725
PO BOX 16726, SANTA BARBARA, CA 93107-6726
PO BOX 16727, SANTA BARBARA, CA 93107-6727
PO BOX 16728, SANTA BARBARA, CA 93107-6728
PO BOX 16729, SANTA BARBARA, CA 93107-6729
PO BOX 16730, SANTA BARBARA, CA 93107-6730
PO BOX 16731, SANTA BARBARA, CA 93107-6731
PO BOX 16732, SANTA BARBARA, CA 93107-6732
PO BOX 16733, SANTA BARBARA, CA 93107-6733
PO BOX 16734, SANTA BARBARA, CA 93107-6734
PO BOX 16735, SANTA BARBARA, CA 93107-6735
PO BOX 16736, SANTA BARBARA, CA 93107-6736
PO BOX 16737, SANTA BARBARA, CA 93107-6737
PO BOX 16738, SANTA BARBARA, CA 93107-6738
PO BOX 16739, SANTA BARBARA, CA 93107-6739
PO BOX 16740, SANTA BARBARA, CA 93107-6740
PO BOX 16741, SANTA BARBARA, CA 93107-6741
PO BOX 16742, SANTA BARBARA, CA 93107-6742
PO BOX 16743, SANTA BARBARA, CA 93107-6743
PO BOX 16744, SANTA BARBARA, CA 93107-6744
PO BOX 16745, SANTA BARBARA, CA 93107-6745
PO BOX 16746, SANTA BARBARA, CA 93107-6746
PO BOX 16747, SANTA BARBARA, CA 93107-6747
PO BOX 16748, SANTA BARBARA, CA 93107-6748
PO BOX 16749, SANTA BARBARA, CA 93107-6749
PO BOX 16750, SANTA BARBARA, CA 93107-6750
PO BOX 16751, SANTA BARBARA, CA 93107-6751
PO BOX 16752, SANTA BARBARA, CA 93107-6752
PO BOX 16753, SANTA BARBARA, CA 93107-6753
PO BOX 16754, SANTA BARBARA, CA 93107-6754
PO BOX 16755, SANTA BARBARA, CA 93107-6755
PO BOX 16756, SANTA BARBARA, CA 93107-6756
PO BOX 16757, SANTA BARBARA, CA 93107-6757
PO BOX 16758, SANTA BARBARA, CA 93107-6758
PO BOX 16759, SANTA BARBARA, CA 93107-6759
PO BOX 16760, SANTA BARBARA, CA 93107-6760
PO BOX 16761, SANTA BARBARA, CA 93107-6761
PO BOX 16762, SANTA BARBARA, CA 93107-6762
PO BOX 16763, SANTA BARBARA, CA 93107-6763
PO BOX 16764, SANTA BARBARA, CA 93107-6764
PO BOX 16765, SANTA BARBARA, CA 93107-6765
PO BOX 16766, SANTA BARBARA, CA 93107-6766
PO BOX 16767, SANTA BARBARA, CA 93107-6767
PO BOX 16768, SANTA BARBARA, CA 93107-6768
PO BOX 16769, SANTA BARBARA, CA 93107-6769
PO BOX 16770, SANTA BARBARA, CA 93107-6770
PO BOX 16771, SANTA BARBARA, CA 93107-6771
PO BOX 16772, SANTA BARBARA, CA 93107-6772
PO BOX 16773, SANTA BARBARA, CA 93107-6773
PO BOX 16774, SANTA BARBARA, CA 93107-6774
PO BOX 16775, SANTA BARBARA, CA 93107-6775
PO BOX 16776, SANTA BARBARA, CA 93107-6776
PO BOX 16777, SANTA BARBARA, CA 93107-6777
PO BOX 16778, SANTA BARBARA, CA 93107-6778
PO BOX 16779, SANTA BARBARA, CA 93107-6779
PO BOX 16780, SANTA BARBARA, CA 93107-6780
PO BOX 16781, SANTA BARBARA, CA 93107-6781
PO BOX 16782, SANTA BARBARA, CA 93107-6782
PO BOX 16783, SANTA BARBARA, CA 93107-6783
PO BOX 16784, SANTA BARBARA, CA 93107-6784
PO BOX 16785, SANTA BARBARA, CA 93107-6785
PO BOX 16786, SANTA BARBARA, CA 93107-6786
PO BOX 16787, SANTA BARBARA, CA 93107-6787
PO BOX 16788, SANTA BARBARA, CA 93107-6788
PO BOX 16789, SANTA BARBARA, CA 93107-6789
PO BOX 16790, SANTA BARBARA, CA 93107-6790
PO BOX 16791, SANTA BARBARA, CA 93107-6791
PO BOX 16792, SANTA BARBARA, CA 93107-6792
PO BOX 16793, SANTA BARBARA, CA 93107-6793
PO BOX 16794, SANTA BARBARA, CA 93107-6794
PO BOX 16795, SANTA BARBARA, CA 93107-6795
PO BOX 16796, SANTA BARBARA, CA 93107-6796
PO BOX 16797, SANTA BARBARA, CA 93107-6797
PO BOX 16798, SANTA BARBARA, CA 93107-6798
PO BOX 16799, SANTA BARBARA, CA 93107-6799
PO BOX 16800, SANTA BARBARA, CA 93107-6800
PO BOX 16801, SANTA BARBARA, CA 93107-6801
PO BOX 16802, SANTA BARBARA, CA 93107-6802
PO BOX 16803, SANTA BARBARA, CA 93107-6803
PO BOX 16804, SANTA BARBARA, CA 93107-6804
PO BOX 16805, SANTA BARBARA, CA 93107-6805
PO BOX 16806, SANTA BARBARA, CA 93107-6806
PO BOX 16807, SANTA BARBARA, CA 93107-6807
PO BOX 16808, SANTA BARBARA, CA 93107-6808
PO BOX 16809, SANTA BARBARA, CA 93107-6809
PO BOX 16810, SANTA BARBARA, CA 93107-6810
PO BOX 16811, SANTA BARBARA, CA 93107-6811
PO BOX 16812, SANTA BARBARA, CA 93107-6812
PO BOX 16813, SANTA BARBARA, CA 93107-6813
PO BOX 16814, SANTA BARBARA, CA 93107-6814
PO BOX 16815, SANTA BARBARA, CA 93107-6815
PO BOX 16816, SANTA BARBARA, CA 93107-6816
PO BOX 16817, SANTA BARBARA, CA 93107-6817
PO BOX 16818, SANTA BARBARA, CA 93107-6818
PO BOX 16819, SANTA BARBARA, CA 93107-6819
PO BOX 16820, SANTA BARBARA, CA 93107-6820
PO BOX 16821, SANTA BARBARA, CA 93107-6821
PO BOX 16822, SANTA BARBARA, CA 93107-6822
PO BOX 16823, SANTA BARBARA, CA 93107-6823
PO BOX 16824, SANTA BARBARA, CA 93107-6824
PO BOX 16825, SANTA BARBARA, CA 93107-6825
PO BOX 16826, SANTA BARBARA, CA 93107-6826
PO BOX 16827, SANTA BARBARA, CA 93107-6827
PO BOX 16828, SANTA BARBARA, CA 93107-6828
PO BOX 16829, SANTA BARBARA, CA 93107-6829
PO BOX 16830, SANTA BARBARA, CA 93107-6830
PO BOX 16831, SANTA BARBARA, CA 93107-6831
PO BOX 16832, SANTA BARBARA, CA 93107-6832
PO BOX 16833, SANTA BARBARA, CA 93107-6833
PO BOX 16834, SANTA BARBARA, CA 93107-6834
PO BOX 16835, SANTA BARBARA, CA 93107-6835
PO BOX 16836, SANTA BARBARA, CA 93107-6836
PO BOX 16837, SANTA BARBARA, CA 93107-6837
PO BOX 16838, SANTA BARBARA, CA 93107-6838
PO BOX 16839, SANTA BARBARA, CA 93107-6839
PO BOX 16840, SANTA BARBARA, CA 93107-6840
PO BOX 16841, SANTA BARBARA, CA 93107-6841
PO BOX 16842, SANTA BARBARA, CA 93107-6842
PO BOX 16843, SANTA BARBARA, CA 93107-6843
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