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 144810, SALT LAKE CITY, UT 84114-4810
PO BOX 144811, SALT LAKE CITY, UT 84114-4811
PO BOX 144812, SALT LAKE CITY, UT 84114-4812
PO BOX 144813, SALT LAKE CITY, UT 84114-4813
PO BOX 144814, SALT LAKE CITY, UT 84114-4814
PO BOX 144815, SALT LAKE CITY, UT 84114-4815
PO BOX 144816, SALT LAKE CITY, UT 84114-4816
PO BOX 144817, SALT LAKE CITY, UT 84114-4817
PO BOX 144818, SALT LAKE CITY, UT 84114-4818
PO BOX 144819, SALT LAKE CITY, UT 84114-4819
PO BOX 144820, SALT LAKE CITY, UT 84114-4820
PO BOX 144821, SALT LAKE CITY, UT 84114-4821
PO BOX 144822, SALT LAKE CITY, UT 84114-4822
PO BOX 144823, SALT LAKE CITY, UT 84114-4823
PO BOX 144824, SALT LAKE CITY, UT 84114-4824
PO BOX 144825, SALT LAKE CITY, UT 84114-4825
PO BOX 144826, SALT LAKE CITY, UT 84114-4826
PO BOX 144827, SALT LAKE CITY, UT 84114-4827
PO BOX 144828, SALT LAKE CITY, UT 84114-4828
PO BOX 144829, SALT LAKE CITY, UT 84114-4829
PO BOX 144830, SALT LAKE CITY, UT 84114-4830
PO BOX 144831, SALT LAKE CITY, UT 84114-4831
PO BOX 144832, SALT LAKE CITY, UT 84114-4832
PO BOX 144833, SALT LAKE CITY, UT 84114-4833
PO BOX 144834, SALT LAKE CITY, UT 84114-4834
PO BOX 144835, SALT LAKE CITY, UT 84114-4835
PO BOX 144836, SALT LAKE CITY, UT 84114-4836
PO BOX 144837, SALT LAKE CITY, UT 84114-4837
PO BOX 144838, SALT LAKE CITY, UT 84114-4838
PO BOX 144839, SALT LAKE CITY, UT 84114-4839
PO BOX 144840, SALT LAKE CITY, UT 84114-4840
PO BOX 144841, SALT LAKE CITY, UT 84114-4841
PO BOX 144842, SALT LAKE CITY, UT 84114-4842
PO BOX 144843, SALT LAKE CITY, UT 84114-4843
PO BOX 144844, SALT LAKE CITY, UT 84114-4844
PO BOX 144845, SALT LAKE CITY, UT 84114-4845
PO BOX 144846, SALT LAKE CITY, UT 84114-4846
PO BOX 144847, SALT LAKE CITY, UT 84114-4847
PO BOX 144848, SALT LAKE CITY, UT 84114-4848
PO BOX 144849, SALT LAKE CITY, UT 84114-4849
PO BOX 144850, SALT LAKE CITY, UT 84114-4850
PO BOX 144851, SALT LAKE CITY, UT 84114-4851
PO BOX 144852, SALT LAKE CITY, UT 84114-4852
PO BOX 144853, SALT LAKE CITY, UT 84114-4853
PO BOX 144854, SALT LAKE CITY, UT 84114-4854
PO BOX 144855, SALT LAKE CITY, UT 84114-4855
PO BOX 144856, SALT LAKE CITY, UT 84114-4856
PO BOX 144857, SALT LAKE CITY, UT 84114-4857
PO BOX 144858, SALT LAKE CITY, UT 84114-4858
PO BOX 144859, SALT LAKE CITY, UT 84114-4859
PO BOX 144860, SALT LAKE CITY, UT 84114-4860
PO BOX 144861, SALT LAKE CITY, UT 84114-4861
PO BOX 144862, SALT LAKE CITY, UT 84114-4862
PO BOX 144863, SALT LAKE CITY, UT 84114-4863
PO BOX 144864, SALT LAKE CITY, UT 84114-4864
PO BOX 144865, SALT LAKE CITY, UT 84114-4865
PO BOX 144866, SALT LAKE CITY, UT 84114-4866
PO BOX 144867, SALT LAKE CITY, UT 84114-4867
PO BOX 144868, SALT LAKE CITY, UT 84114-4868
PO BOX 144869, SALT LAKE CITY, UT 84114-4869
PO BOX 144870, SALT LAKE CITY, UT 84114-4870
PO BOX 144871, SALT LAKE CITY, UT 84114-4871
PO BOX 144872, SALT LAKE CITY, UT 84114-4872
PO BOX 144873, SALT LAKE CITY, UT 84114-4873
PO BOX 144874, SALT LAKE CITY, UT 84114-4874
PO BOX 144875, SALT LAKE CITY, UT 84114-4875
PO BOX 144876, SALT LAKE CITY, UT 84114-4876
PO BOX 144877, SALT LAKE CITY, UT 84114-4877
PO BOX 144878, SALT LAKE CITY, UT 84114-4878
PO BOX 144879, SALT LAKE CITY, UT 84114-4879
PO BOX 144880, SALT LAKE CITY, UT 84114-4880
PO BOX 144881, SALT LAKE CITY, UT 84114-4881
PO BOX 144882, SALT LAKE CITY, UT 84114-4882
PO BOX 144883, SALT LAKE CITY, UT 84114-4883
PO BOX 144884, SALT LAKE CITY, UT 84114-4884
PO BOX 144885, SALT LAKE CITY, UT 84114-4885
PO BOX 144886, SALT LAKE CITY, UT 84114-4886
PO BOX 144887, SALT LAKE CITY, UT 84114-4887
PO BOX 144888, SALT LAKE CITY, UT 84114-4888
PO BOX 144889, SALT LAKE CITY, UT 84114-4889
PO BOX 144890, SALT LAKE CITY, UT 84114-4890
PO BOX 144891, SALT LAKE CITY, UT 84114-4891
PO BOX 144892, SALT LAKE CITY, UT 84114-4892
PO BOX 144893, SALT LAKE CITY, UT 84114-4893
PO BOX 144894, SALT LAKE CITY, UT 84114-4894
PO BOX 144895, SALT LAKE CITY, UT 84114-4895
PO BOX 144896, SALT LAKE CITY, UT 84114-4896
PO BOX 144897, SALT LAKE CITY, UT 84114-4897
PO BOX 144898, SALT LAKE CITY, UT 84114-4898
PO BOX 144899, SALT LAKE CITY, UT 84114-4899
PO BOX 144900, SALT LAKE CITY, UT 84114-4900
PO BOX 144901, SALT LAKE CITY, UT 84114-4901
PO BOX 144902, SALT LAKE CITY, UT 84114-4902
PO BOX 144903, SALT LAKE CITY, UT 84114-4903
PO BOX 144904, SALT LAKE CITY, UT 84114-4904
PO BOX 144905, SALT LAKE CITY, UT 84114-4905
PO BOX 144906, SALT LAKE CITY, UT 84114-4906
PO BOX 144907, SALT LAKE CITY, UT 84114-4907
PO BOX 144908, SALT LAKE CITY, UT 84114-4908
PO BOX 144909, SALT LAKE CITY, UT 84114-4909
PO BOX 144910, SALT LAKE CITY, UT 84114-4910
PO BOX 144911, SALT LAKE CITY, UT 84114-4911
PO BOX 144912, SALT LAKE CITY, UT 84114-4912
PO BOX 144913, SALT LAKE CITY, UT 84114-4913
PO BOX 144914, SALT LAKE CITY, UT 84114-4914
PO BOX 144915, SALT LAKE CITY, UT 84114-4915
PO BOX 144916, SALT LAKE CITY, UT 84114-4916
PO BOX 144917, SALT LAKE CITY, UT 84114-4917
PO BOX 144918, SALT LAKE CITY, UT 84114-4918
PO BOX 144919, SALT LAKE CITY, UT 84114-4919
PO BOX 144920, SALT LAKE CITY, UT 84114-4920
PO BOX 144921, SALT LAKE CITY, UT 84114-4921
PO BOX 144922, SALT LAKE CITY, UT 84114-4922
PO BOX 144923, SALT LAKE CITY, UT 84114-4923
PO BOX 144924, SALT LAKE CITY, UT 84114-4924
PO BOX 144925, SALT LAKE CITY, UT 84114-4925
PO BOX 144926, SALT LAKE CITY, UT 84114-4926
PO BOX 144927, SALT LAKE CITY, UT 84114-4927
PO BOX 144928, SALT LAKE CITY, UT 84114-4928
PO BOX 144929, SALT LAKE CITY, UT 84114-4929
PO BOX 144930, SALT LAKE CITY, UT 84114-4930
PO BOX 144931, SALT LAKE CITY, UT 84114-4931
PO BOX 144932, SALT LAKE CITY, UT 84114-4932
PO BOX 144933, SALT LAKE CITY, UT 84114-4933
PO BOX 144934, SALT LAKE CITY, UT 84114-4934
PO BOX 144935, SALT LAKE CITY, UT 84114-4935
PO BOX 144936, SALT LAKE CITY, UT 84114-4936
PO BOX 144937, SALT LAKE CITY, UT 84114-4937
PO BOX 144938, SALT LAKE CITY, UT 84114-4938
PO BOX 144939, SALT LAKE CITY, UT 84114-4939
PO BOX 144940, SALT LAKE CITY, UT 84114-4940
PO BOX 144941, SALT LAKE CITY, UT 84114-4941
PO BOX 144942, SALT LAKE CITY, UT 84114-4942
PO BOX 144943, SALT LAKE CITY, UT 84114-4943
PO BOX 144944, SALT LAKE CITY, UT 84114-4944
PO BOX 144945, SALT LAKE CITY, UT 84114-4945
PO BOX 144946, SALT LAKE CITY, UT 84114-4946
PO BOX 144947, SALT LAKE CITY, UT 84114-4947
PO BOX 144948, SALT LAKE CITY, UT 84114-4948
PO BOX 144949, SALT LAKE CITY, UT 84114-4949
PO BOX 144950, SALT LAKE CITY, UT 84114-4950
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