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 830801, RICHARDSON, TX 75083-0801
PO BOX 830802, RICHARDSON, TX 75083-0802
PO BOX 830803, RICHARDSON, TX 75083-0803
PO BOX 830804, RICHARDSON, TX 75083-0804
PO BOX 830805, RICHARDSON, TX 75083-0805
PO BOX 830806, RICHARDSON, TX 75083-0806
PO BOX 830807, RICHARDSON, TX 75083-0807
PO BOX 830808, RICHARDSON, TX 75083-0808
PO BOX 830809, RICHARDSON, TX 75083-0809
PO BOX 830810, RICHARDSON, TX 75083-0810
PO BOX 830811, RICHARDSON, TX 75083-0811
PO BOX 830812, RICHARDSON, TX 75083-0812
PO BOX 830813, RICHARDSON, TX 75083-0813
PO BOX 830814, RICHARDSON, TX 75083-0814
PO BOX 830815, RICHARDSON, TX 75083-0815
PO BOX 830816, RICHARDSON, TX 75083-0816
PO BOX 830817, RICHARDSON, TX 75083-0817
PO BOX 830818, RICHARDSON, TX 75083-0818
PO BOX 830819, RICHARDSON, TX 75083-0819
PO BOX 830820, RICHARDSON, TX 75083-0820
PO BOX 830821, RICHARDSON, TX 75083-0821
PO BOX 830822, RICHARDSON, TX 75083-0822
PO BOX 830823, RICHARDSON, TX 75083-0823
PO BOX 830824, RICHARDSON, TX 75083-0824
PO BOX 830825, RICHARDSON, TX 75083-0825
PO BOX 830826, RICHARDSON, TX 75083-0826
PO BOX 830827, RICHARDSON, TX 75083-0827
PO BOX 830828, RICHARDSON, TX 75083-0828
PO BOX 830829, RICHARDSON, TX 75083-0829
PO BOX 830830, RICHARDSON, TX 75083-0830
PO BOX 830831, RICHARDSON, TX 75083-0831
PO BOX 830832, RICHARDSON, TX 75083-0832
PO BOX 830833, RICHARDSON, TX 75083-0833
PO BOX 830834, RICHARDSON, TX 75083-0834
PO BOX 830835, RICHARDSON, TX 75083-0835
PO BOX 830836, RICHARDSON, TX 75083-0836
PO BOX 830837, RICHARDSON, TX 75083-0837
PO BOX 830838, RICHARDSON, TX 75083-0838
PO BOX 830839, RICHARDSON, TX 75083-0839
PO BOX 830840, RICHARDSON, TX 75083-0840
PO BOX 830841, RICHARDSON, TX 75083-0841
PO BOX 830842, RICHARDSON, TX 75083-0842
PO BOX 830843, RICHARDSON, TX 75083-0843
PO BOX 830844, RICHARDSON, TX 75083-0844
PO BOX 830845, RICHARDSON, TX 75083-0845
PO BOX 830846, RICHARDSON, TX 75083-0846
PO BOX 830847, RICHARDSON, TX 75083-0847
PO BOX 830848, RICHARDSON, TX 75083-0848
PO BOX 830849, RICHARDSON, TX 75083-0849
PO BOX 830850, RICHARDSON, TX 75083-0850
PO BOX 830851, RICHARDSON, TX 75083-0851
PO BOX 830852, RICHARDSON, TX 75083-0852
PO BOX 830853, RICHARDSON, TX 75083-0853
PO BOX 830854, RICHARDSON, TX 75083-0854
PO BOX 830855, RICHARDSON, TX 75083-0855
PO BOX 830856, RICHARDSON, TX 75083-0856
PO BOX 830857, RICHARDSON, TX 75083-0857
PO BOX 830858, RICHARDSON, TX 75083-0858
PO BOX 830859, RICHARDSON, TX 75083-0859
PO BOX 830860, RICHARDSON, TX 75083-0860
PO BOX 830861, RICHARDSON, TX 75083-0861
PO BOX 830862, RICHARDSON, TX 75083-0862
PO BOX 830863, RICHARDSON, TX 75083-0863
PO BOX 830864, RICHARDSON, TX 75083-0864
PO BOX 830865, RICHARDSON, TX 75083-0865
PO BOX 830866, RICHARDSON, TX 75083-0866
PO BOX 830867, RICHARDSON, TX 75083-0867
PO BOX 830868, RICHARDSON, TX 75083-0868
PO BOX 830869, RICHARDSON, TX 75083-0869
PO BOX 830870, RICHARDSON, TX 75083-0870
PO BOX 830871, RICHARDSON, TX 75083-0871
PO BOX 830872, RICHARDSON, TX 75083-0872
PO BOX 830873, RICHARDSON, TX 75083-0873
PO BOX 830874, RICHARDSON, TX 75083-0874
PO BOX 830875, RICHARDSON, TX 75083-0875
PO BOX 830876, RICHARDSON, TX 75083-0876
PO BOX 830877, RICHARDSON, TX 75083-0877
PO BOX 830878, RICHARDSON, TX 75083-0878
PO BOX 830879, RICHARDSON, TX 75083-0879
PO BOX 830880, RICHARDSON, TX 75083-0880
PO BOX 830881, RICHARDSON, TX 75083-0881
PO BOX 830882, RICHARDSON, TX 75083-0882
PO BOX 830883, RICHARDSON, TX 75083-0883
PO BOX 830884, RICHARDSON, TX 75083-0884
PO BOX 830885, RICHARDSON, TX 75083-0885
PO BOX 830886, RICHARDSON, TX 75083-0886
PO BOX 830887, RICHARDSON, TX 75083-0887
PO BOX 830888, RICHARDSON, TX 75083-0888
PO BOX 830889, RICHARDSON, TX 75083-0889
PO BOX 830890, RICHARDSON, TX 75083-0890
PO BOX 830891, RICHARDSON, TX 75083-0891
PO BOX 830892, RICHARDSON, TX 75083-0892
PO BOX 830893, RICHARDSON, TX 75083-0893
PO BOX 830894, RICHARDSON, TX 75083-0894
PO BOX 830895, RICHARDSON, TX 75083-0895
PO BOX 830896, RICHARDSON, TX 75083-0896
PO BOX 830897, RICHARDSON, TX 75083-0897
PO BOX 830898, RICHARDSON, TX 75083-0898
PO BOX 830899, RICHARDSON, TX 75083-0899
PO BOX 830900, RICHARDSON, TX 75083-0900
PO BOX 830901, RICHARDSON, TX 75083-0901
PO BOX 830902, RICHARDSON, TX 75083-0902
PO BOX 830903, RICHARDSON, TX 75083-0903
PO BOX 830904, RICHARDSON, TX 75083-0904
PO BOX 830905, RICHARDSON, TX 75083-0905
PO BOX 830906, RICHARDSON, TX 75083-0906
PO BOX 830907, RICHARDSON, TX 75083-0907
PO BOX 830908, RICHARDSON, TX 75083-0908
PO BOX 830909, RICHARDSON, TX 75083-0909
PO BOX 830910, RICHARDSON, TX 75083-0910
PO BOX 830911, RICHARDSON, TX 75083-0911
PO BOX 830912, RICHARDSON, TX 75083-0912
PO BOX 830913, RICHARDSON, TX 75083-0913
PO BOX 830914, RICHARDSON, TX 75083-0914
PO BOX 830915, RICHARDSON, TX 75083-0915
PO BOX 830916, RICHARDSON, TX 75083-0916
PO BOX 830917, RICHARDSON, TX 75083-0917
PO BOX 830918, RICHARDSON, TX 75083-0918
PO BOX 830919, RICHARDSON, TX 75083-0919
PO BOX 830920, RICHARDSON, TX 75083-0920
PO BOX 830921, RICHARDSON, TX 75083-0921
PO BOX 830922, RICHARDSON, TX 75083-0922
PO BOX 830923, RICHARDSON, TX 75083-0923
PO BOX 830924, RICHARDSON, TX 75083-0924
PO BOX 830925, RICHARDSON, TX 75083-0925
PO BOX 830926, RICHARDSON, TX 75083-0926
PO BOX 830927, RICHARDSON, TX 75083-0927
PO BOX 830928, RICHARDSON, TX 75083-0928
PO BOX 830929, RICHARDSON, TX 75083-0929
PO BOX 830930, RICHARDSON, TX 75083-0930
PO BOX 830931, RICHARDSON, TX 75083-0931
PO BOX 830932, RICHARDSON, TX 75083-0932
PO BOX 830933, RICHARDSON, TX 75083-0933
PO BOX 830934, RICHARDSON, TX 75083-0934
PO BOX 830935, RICHARDSON, TX 75083-0935
PO BOX 830936, RICHARDSON, TX 75083-0936
PO BOX 830937, RICHARDSON, TX 75083-0937
PO BOX 830938, RICHARDSON, TX 75083-0938
PO BOX 830939, RICHARDSON, TX 75083-0939
PO BOX 830940, RICHARDSON, TX 75083-0940
PO BOX 830941, RICHARDSON, TX 75083-0941
PO BOX 830942, RICHARDSON, TX 75083-0942
PO BOX 830943, RICHARDSON, TX 75083-0943
PO BOX 830944, RICHARDSON, TX 75083-0944
PO BOX 830945, RICHARDSON, TX 75083-0945
PO BOX 830946, RICHARDSON, TX 75083-0946
PO BOX 830947, RICHARDSON, TX 75083-0947
PO BOX 830948, RICHARDSON, TX 75083-0948
PO BOX 830949, RICHARDSON, TX 75083-0949
PO BOX 830950, RICHARDSON, TX 75083-0950
PO BOX 830951, RICHARDSON, TX 75083-0951
PO BOX 830952, RICHARDSON, TX 75083-0952
PO BOX 830953, RICHARDSON, TX 75083-0953
PO BOX 830954, RICHARDSON, TX 75083-0954
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