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 310671, NEWINGTON, CT 06131-0671
PO BOX 310672, NEWINGTON, CT 06131-0672
PO BOX 310673, NEWINGTON, CT 06131-0673
PO BOX 310674, NEWINGTON, CT 06131-0674
PO BOX 310675, NEWINGTON, CT 06131-0675
PO BOX 310676, NEWINGTON, CT 06131-0676
PO BOX 310677, NEWINGTON, CT 06131-0677
PO BOX 310678, NEWINGTON, CT 06131-0678
PO BOX 310679, NEWINGTON, CT 06131-0679
PO BOX 310680, NEWINGTON, CT 06131-0680
PO BOX 310681, NEWINGTON, CT 06131-0681
PO BOX 310682, NEWINGTON, CT 06131-0682
PO BOX 310683, NEWINGTON, CT 06131-0683
PO BOX 310684, NEWINGTON, CT 06131-0684
PO BOX 310685, NEWINGTON, CT 06131-0685
PO BOX 310686, NEWINGTON, CT 06131-0686
PO BOX 310687, NEWINGTON, CT 06131-0687
PO BOX 310688, NEWINGTON, CT 06131-0688
PO BOX 310689, NEWINGTON, CT 06131-0689
PO BOX 310690, NEWINGTON, CT 06131-0690
PO BOX 310691, NEWINGTON, CT 06131-0691
PO BOX 310692, NEWINGTON, CT 06131-0692
PO BOX 310693, NEWINGTON, CT 06131-0693
PO BOX 310694, NEWINGTON, CT 06131-0694
PO BOX 310695, NEWINGTON, CT 06131-0695
PO BOX 310696, NEWINGTON, CT 06131-0696
PO BOX 310697, NEWINGTON, CT 06131-0697
PO BOX 310698, NEWINGTON, CT 06131-0698
PO BOX 310699, NEWINGTON, CT 06131-0699
PO BOX 310700, NEWINGTON, CT 06131-0700
PO BOX 310701, NEWINGTON, CT 06131-0701
PO BOX 310702, NEWINGTON, CT 06131-0702
PO BOX 310703, NEWINGTON, CT 06131-0703
PO BOX 310704, NEWINGTON, CT 06131-0704
PO BOX 310705, NEWINGTON, CT 06131-0705
PO BOX 310706, NEWINGTON, CT 06131-0706
PO BOX 310707, NEWINGTON, CT 06131-0707
PO BOX 310708, NEWINGTON, CT 06131-0708
PO BOX 310709, NEWINGTON, CT 06131-0709
PO BOX 310710, NEWINGTON, CT 06131-0710
PO BOX 310711, NEWINGTON, CT 06131-0711
PO BOX 310712, NEWINGTON, CT 06131-0712
PO BOX 310713, NEWINGTON, CT 06131-0713
PO BOX 310714, NEWINGTON, CT 06131-0714
PO BOX 310715, NEWINGTON, CT 06131-0715
PO BOX 310716, NEWINGTON, CT 06131-0716
PO BOX 310717, NEWINGTON, CT 06131-0717
PO BOX 310718, NEWINGTON, CT 06131-0718
PO BOX 310719, NEWINGTON, CT 06131-0719
PO BOX 310720, NEWINGTON, CT 06131-0720
PO BOX 310721, NEWINGTON, CT 06131-0721
PO BOX 310722, NEWINGTON, CT 06131-0722
PO BOX 310723, NEWINGTON, CT 06131-0723
PO BOX 310724, NEWINGTON, CT 06131-0724
PO BOX 310725, NEWINGTON, CT 06131-0725
PO BOX 310726, NEWINGTON, CT 06131-0726
PO BOX 310727, NEWINGTON, CT 06131-0727
PO BOX 310728, NEWINGTON, CT 06131-0728
PO BOX 310729, NEWINGTON, CT 06131-0729
PO BOX 310730, NEWINGTON, CT 06131-0730
PO BOX 310731, NEWINGTON, CT 06131-0731
PO BOX 310732, NEWINGTON, CT 06131-0732
PO BOX 310733, NEWINGTON, CT 06131-0733
PO BOX 310734, NEWINGTON, CT 06131-0734
PO BOX 310735, NEWINGTON, CT 06131-0735
PO BOX 310736, NEWINGTON, CT 06131-0736
PO BOX 310737, NEWINGTON, CT 06131-0737
PO BOX 310738, NEWINGTON, CT 06131-0738
PO BOX 310739, NEWINGTON, CT 06131-0739
PO BOX 310740, NEWINGTON, CT 06131-0740
PO BOX 310741, NEWINGTON, CT 06131-0741
PO BOX 310742, NEWINGTON, CT 06131-0742
PO BOX 310743, NEWINGTON, CT 06131-0743
PO BOX 310744, NEWINGTON, CT 06131-0744
PO BOX 310745, NEWINGTON, CT 06131-0745
PO BOX 310746, NEWINGTON, CT 06131-0746
PO BOX 310747, NEWINGTON, CT 06131-0747
PO BOX 310748, NEWINGTON, CT 06131-0748
PO BOX 310749, NEWINGTON, CT 06131-0749
PO BOX 310750, NEWINGTON, CT 06131-0750
PO BOX 310751, NEWINGTON, CT 06131-0751
PO BOX 310752, NEWINGTON, CT 06131-0752
PO BOX 310753, NEWINGTON, CT 06131-0753
PO BOX 310754, NEWINGTON, CT 06131-0754
PO BOX 310755, NEWINGTON, CT 06131-0755
PO BOX 310756, NEWINGTON, CT 06131-0756
PO BOX 310757, NEWINGTON, CT 06131-0757
PO BOX 310758, NEWINGTON, CT 06131-0758
PO BOX 310759, NEWINGTON, CT 06131-0759
PO BOX 310760, NEWINGTON, CT 06131-0760
PO BOX 310761, NEWINGTON, CT 06131-0761
PO BOX 310762, NEWINGTON, CT 06131-0762
PO BOX 310763, NEWINGTON, CT 06131-0763
PO BOX 310764, NEWINGTON, CT 06131-0764
PO BOX 310765, NEWINGTON, CT 06131-0765
PO BOX 310766, NEWINGTON, CT 06131-0766
PO BOX 310767, NEWINGTON, CT 06131-0767
PO BOX 310768, NEWINGTON, CT 06131-0768
PO BOX 310769, NEWINGTON, CT 06131-0769
PO BOX 310770, NEWINGTON, CT 06131-0770
PO BOX 310771, NEWINGTON, CT 06131-0771
PO BOX 310772, NEWINGTON, CT 06131-0772
PO BOX 310773, NEWINGTON, CT 06131-0773
PO BOX 310774, NEWINGTON, CT 06131-0774
PO BOX 310775, NEWINGTON, CT 06131-0775
PO BOX 310776, NEWINGTON, CT 06131-0776
PO BOX 310777, NEWINGTON, CT 06131-0777
PO BOX 310778, NEWINGTON, CT 06131-0778
PO BOX 310779, NEWINGTON, CT 06131-0779
PO BOX 310780, NEWINGTON, CT 06131-0780
PO BOX 310781, NEWINGTON, CT 06131-0781
PO BOX 310782, NEWINGTON, CT 06131-0782
PO BOX 310783, NEWINGTON, CT 06131-0783
PO BOX 310784, NEWINGTON, CT 06131-0784
PO BOX 310785, NEWINGTON, CT 06131-0785
PO BOX 310786, NEWINGTON, CT 06131-0786
PO BOX 310787, NEWINGTON, CT 06131-0787
PO BOX 310788, NEWINGTON, CT 06131-0788
PO BOX 310789, NEWINGTON, CT 06131-0789
PO BOX 310790, NEWINGTON, CT 06131-0790
PO BOX 310791, NEWINGTON, CT 06131-0791
PO BOX 310792, NEWINGTON, CT 06131-0792
PO BOX 310793, NEWINGTON, CT 06131-0793
PO BOX 310794, NEWINGTON, CT 06131-0794
PO BOX 310795, NEWINGTON, CT 06131-0795
PO BOX 310796, NEWINGTON, CT 06131-0796
PO BOX 310797, NEWINGTON, CT 06131-0797
PO BOX 310798, NEWINGTON, CT 06131-0798
PO BOX 310799, NEWINGTON, CT 06131-0799
PO BOX 310800, NEWINGTON, CT 06131-0800
PO BOX 310801, NEWINGTON, CT 06131-0801
PO BOX 310802, NEWINGTON, CT 06131-0802
PO BOX 310803, NEWINGTON, CT 06131-0803
PO BOX 310804, NEWINGTON, CT 06131-0804
PO BOX 310805, NEWINGTON, CT 06131-0805
PO BOX 310806, NEWINGTON, CT 06131-0806
PO BOX 310807, NEWINGTON, CT 06131-0807
PO BOX 310808, NEWINGTON, CT 06131-0808
PO BOX 310809, NEWINGTON, CT 06131-0809
PO BOX 310810, NEWINGTON, CT 06131-0810
PO BOX 310811, NEWINGTON, CT 06131-0811
PO BOX 310812, NEWINGTON, CT 06131-0812
PO BOX 310813, NEWINGTON, CT 06131-0813
PO BOX 310814, NEWINGTON, CT 06131-0814
PO BOX 310815, NEWINGTON, CT 06131-0815
PO BOX 310816, NEWINGTON, CT 06131-0816
PO BOX 310817, NEWINGTON, CT 06131-0817
PO BOX 310818, NEWINGTON, CT 06131-0818
PO BOX 310819, NEWINGTON, CT 06131-0819
PO BOX 310820, NEWINGTON, CT 06131-0820
PO BOX 310821, NEWINGTON, CT 06131-0821
PO BOX 310822, NEWINGTON, CT 06131-0822
PO BOX 310823, NEWINGTON, CT 06131-0823
PO BOX 310824, NEWINGTON, CT 06131-0824
PO BOX 310825, NEWINGTON, CT 06131-0825
PO BOX 310826, NEWINGTON, CT 06131-0826
PO BOX 310827, NEWINGTON, CT 06131-0827
PO BOX 310828, NEWINGTON, CT 06131-0828
PO BOX 310829, NEWINGTON, CT 06131-0829
PO BOX 310830, NEWINGTON, CT 06131-0830
PO BOX 310831, NEWINGTON, CT 06131-0831
PO BOX 310832, NEWINGTON, CT 06131-0832
PO BOX 310833, NEWINGTON, CT 06131-0833
PO BOX 310834, NEWINGTON, CT 06131-0834
PO BOX 310835, NEWINGTON, CT 06131-0835
PO BOX 310836, NEWINGTON, CT 06131-0836
PO BOX 310837, NEWINGTON, CT 06131-0837
PO BOX 310838, NEWINGTON, CT 06131-0838
PO BOX 310839, NEWINGTON, CT 06131-0839
PO BOX 310840, NEWINGTON, CT 06131-0840
PO BOX 310841, NEWINGTON, CT 06131-0841
PO BOX 310842, NEWINGTON, CT 06131-0842
PO BOX 310843, NEWINGTON, CT 06131-0843
PO BOX 310844, NEWINGTON, CT 06131-0844
PO BOX 310845, NEWINGTON, CT 06131-0845
PO BOX 310846, NEWINGTON, CT 06131-0846
PO BOX 310847, NEWINGTON, CT 06131-0847
PO BOX 310848, NEWINGTON, CT 06131-0848
PO BOX 310849, NEWINGTON, CT 06131-0849
PO BOX 310850, NEWINGTON, CT 06131-0850
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