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 5861, CAPITOL HEIGHTS, MD 20791-5861
PO BOX 5862, CAPITOL HEIGHTS, MD 20791-5862
PO BOX 5863, CAPITOL HEIGHTS, MD 20791-5863
PO BOX 5864, CAPITOL HEIGHTS, MD 20791-5864
PO BOX 5865, CAPITOL HEIGHTS, MD 20791-5865
PO BOX 5866, CAPITOL HEIGHTS, MD 20791-5866
PO BOX 5867, CAPITOL HEIGHTS, MD 20791-5867
PO BOX 5868, CAPITOL HEIGHTS, MD 20791-5868
PO BOX 5869, CAPITOL HEIGHTS, MD 20791-5869
PO BOX 5870, CAPITOL HEIGHTS, MD 20791-5870
PO BOX 5871, CAPITOL HEIGHTS, MD 20791-5871
PO BOX 5872, CAPITOL HEIGHTS, MD 20791-5872
PO BOX 5873, CAPITOL HEIGHTS, MD 20791-5873
PO BOX 5874, CAPITOL HEIGHTS, MD 20791-5874
PO BOX 5875, CAPITOL HEIGHTS, MD 20791-5875
PO BOX 5876, CAPITOL HEIGHTS, MD 20791-5876
PO BOX 5877, CAPITOL HEIGHTS, MD 20791-5877
PO BOX 5878, CAPITOL HEIGHTS, MD 20791-5878
PO BOX 5879, CAPITOL HEIGHTS, MD 20791-5879
PO BOX 5880, CAPITOL HEIGHTS, MD 20791-5880
PO BOX 5881, CAPITOL HEIGHTS, MD 20791-5881
PO BOX 5882, CAPITOL HEIGHTS, MD 20791-5882
PO BOX 5883, CAPITOL HEIGHTS, MD 20791-5883
PO BOX 5884, CAPITOL HEIGHTS, MD 20791-5884
PO BOX 5885, CAPITOL HEIGHTS, MD 20791-5885
PO BOX 5886, CAPITOL HEIGHTS, MD 20791-5886
PO BOX 5887, CAPITOL HEIGHTS, MD 20791-5887
PO BOX 5888, CAPITOL HEIGHTS, MD 20791-5888
PO BOX 5889, CAPITOL HEIGHTS, MD 20791-5889
PO BOX 5890, CAPITOL HEIGHTS, MD 20791-5890
PO BOX 5891, CAPITOL HEIGHTS, MD 20791-5891
PO BOX 5892, CAPITOL HEIGHTS, MD 20791-5892
PO BOX 5893, CAPITOL HEIGHTS, MD 20791-5893
PO BOX 5894, CAPITOL HEIGHTS, MD 20791-5894
PO BOX 5895, CAPITOL HEIGHTS, MD 20791-5895
PO BOX 5896, CAPITOL HEIGHTS, MD 20791-5896
PO BOX 5897, CAPITOL HEIGHTS, MD 20791-5897
PO BOX 5898, CAPITOL HEIGHTS, MD 20791-5898
PO BOX 5899, CAPITOL HEIGHTS, MD 20791-5899
PO BOX 5900, CAPITOL HEIGHTS, MD 20791-5900
PO BOX 5901, CAPITOL HEIGHTS, MD 20791-5901
PO BOX 5902, CAPITOL HEIGHTS, MD 20791-5902
PO BOX 5903, CAPITOL HEIGHTS, MD 20791-5903
PO BOX 5904, CAPITOL HEIGHTS, MD 20791-5904
PO BOX 5905, CAPITOL HEIGHTS, MD 20791-5905
PO BOX 5906, CAPITOL HEIGHTS, MD 20791-5906
PO BOX 5907, CAPITOL HEIGHTS, MD 20791-5907
PO BOX 5908, CAPITOL HEIGHTS, MD 20791-5908
PO BOX 5909, CAPITOL HEIGHTS, MD 20791-5909
PO BOX 5910, CAPITOL HEIGHTS, MD 20791-5910
PO BOX 5911, CAPITOL HEIGHTS, MD 20791-5911
PO BOX 5912, CAPITOL HEIGHTS, MD 20791-5912
PO BOX 5913, CAPITOL HEIGHTS, MD 20791-5913
PO BOX 5914, CAPITOL HEIGHTS, MD 20791-5914
PO BOX 5915, CAPITOL HEIGHTS, MD 20791-5915
PO BOX 5916, CAPITOL HEIGHTS, MD 20791-5916
PO BOX 5917, CAPITOL HEIGHTS, MD 20791-5917
PO BOX 5918, CAPITOL HEIGHTS, MD 20791-5918
PO BOX 5919, CAPITOL HEIGHTS, MD 20791-5919
PO BOX 5920, CAPITOL HEIGHTS, MD 20791-5920
PO BOX 5921, CAPITOL HEIGHTS, MD 20791-5921
PO BOX 5922, CAPITOL HEIGHTS, MD 20791-5922
PO BOX 5923, CAPITOL HEIGHTS, MD 20791-5923
PO BOX 5924, CAPITOL HEIGHTS, MD 20791-5924
PO BOX 5925, CAPITOL HEIGHTS, MD 20791-5925
PO BOX 5926, CAPITOL HEIGHTS, MD 20791-5926
PO BOX 5927, CAPITOL HEIGHTS, MD 20791-5927
PO BOX 5928, CAPITOL HEIGHTS, MD 20791-5928
PO BOX 5929, CAPITOL HEIGHTS, MD 20791-5929
PO BOX 5930, CAPITOL HEIGHTS, MD 20791-5930
PO BOX 5931, CAPITOL HEIGHTS, MD 20791-5931
PO BOX 5932, CAPITOL HEIGHTS, MD 20791-5932
PO BOX 5933, CAPITOL HEIGHTS, MD 20791-5933
PO BOX 5934, CAPITOL HEIGHTS, MD 20791-5934
PO BOX 5935, CAPITOL HEIGHTS, MD 20791-5935
PO BOX 5936, CAPITOL HEIGHTS, MD 20791-5936
PO BOX 5937, CAPITOL HEIGHTS, MD 20791-5937
PO BOX 5938, CAPITOL HEIGHTS, MD 20791-5938
PO BOX 5939, CAPITOL HEIGHTS, MD 20791-5939
PO BOX 5940, CAPITOL HEIGHTS, MD 20791-5940
PO BOX 5941, CAPITOL HEIGHTS, MD 20791-5941
PO BOX 5942, CAPITOL HEIGHTS, MD 20791-5942
PO BOX 5943, CAPITOL HEIGHTS, MD 20791-5943
PO BOX 5944, CAPITOL HEIGHTS, MD 20791-5944
PO BOX 5945, CAPITOL HEIGHTS, MD 20791-5945
PO BOX 5946, CAPITOL HEIGHTS, MD 20791-5946
PO BOX 5947, CAPITOL HEIGHTS, MD 20791-5947
PO BOX 5948, CAPITOL HEIGHTS, MD 20791-5948
PO BOX 5949, CAPITOL HEIGHTS, MD 20791-5949
PO BOX 5950, CAPITOL HEIGHTS, MD 20791-5950
PO BOX 5951, CAPITOL HEIGHTS, MD 20791-5951
PO BOX 5952, CAPITOL HEIGHTS, MD 20791-5952
PO BOX 5953, CAPITOL HEIGHTS, MD 20791-5953
PO BOX 5954, CAPITOL HEIGHTS, MD 20791-5954
PO BOX 5955, CAPITOL HEIGHTS, MD 20791-5955
PO BOX 5956, CAPITOL HEIGHTS, MD 20791-5956
PO BOX 5957, CAPITOL HEIGHTS, MD 20791-5957
PO BOX 5958, CAPITOL HEIGHTS, MD 20791-5958
PO BOX 5959, CAPITOL HEIGHTS, MD 20791-5959
PO BOX 5960, CAPITOL HEIGHTS, MD 20791-5960
PO BOX 5961, CAPITOL HEIGHTS, MD 20791-5961
PO BOX 5962, CAPITOL HEIGHTS, MD 20791-5962
PO BOX 5963, CAPITOL HEIGHTS, MD 20791-5963
PO BOX 5964, CAPITOL HEIGHTS, MD 20791-5964
PO BOX 5965, CAPITOL HEIGHTS, MD 20791-5965
PO BOX 5966, CAPITOL HEIGHTS, MD 20791-5966
PO BOX 5967, CAPITOL HEIGHTS, MD 20791-5967
PO BOX 5968, CAPITOL HEIGHTS, MD 20791-5968
PO BOX 5969, CAPITOL HEIGHTS, MD 20791-5969
PO BOX 5970, CAPITOL HEIGHTS, MD 20791-5970
PO BOX 5971, CAPITOL HEIGHTS, MD 20791-5971
PO BOX 5972, CAPITOL HEIGHTS, MD 20791-5972
PO BOX 5973, CAPITOL HEIGHTS, MD 20791-5973
PO BOX 5974, CAPITOL HEIGHTS, MD 20791-5974
PO BOX 5975, CAPITOL HEIGHTS, MD 20791-5975
PO BOX 5976, CAPITOL HEIGHTS, MD 20791-5976
PO BOX 5977, CAPITOL HEIGHTS, MD 20791-5977
PO BOX 5978, CAPITOL HEIGHTS, MD 20791-5978
PO BOX 5979, CAPITOL HEIGHTS, MD 20791-5979
PO BOX 5980, CAPITOL HEIGHTS, MD 20791-5980
PO BOX 5981, CAPITOL HEIGHTS, MD 20791-5981
PO BOX 5982, CAPITOL HEIGHTS, MD 20791-5982
PO BOX 5983, CAPITOL HEIGHTS, MD 20791-5983
PO BOX 5984, CAPITOL HEIGHTS, MD 20791-5984
PO BOX 5985, CAPITOL HEIGHTS, MD 20791-5985
PO BOX 5986, CAPITOL HEIGHTS, MD 20791-5986
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