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 5001, COLORADO SPRINGS, CO 80931-5001
PO BOX 5002, COLORADO SPRINGS, CO 80931-5002
PO BOX 5003, COLORADO SPRINGS, CO 80931-5003
PO BOX 5004, COLORADO SPRINGS, CO 80931-5004
PO BOX 5005, COLORADO SPRINGS, CO 80931-5005
PO BOX 5006, COLORADO SPRINGS, CO 80931-5006
PO BOX 5007, COLORADO SPRINGS, CO 80931-5007
PO BOX 5008, COLORADO SPRINGS, CO 80931-5008
PO BOX 5009, COLORADO SPRINGS, CO 80931-5009
PO BOX 5010, COLORADO SPRINGS, CO 80931-5010
PO BOX 5011, COLORADO SPRINGS, CO 80931-5011
PO BOX 5012, COLORADO SPRINGS, CO 80931-5012
PO BOX 5013, COLORADO SPRINGS, CO 80931-5013
PO BOX 5014, COLORADO SPRINGS, CO 80931-5014
PO BOX 5015, COLORADO SPRINGS, CO 80931-5015
PO BOX 5016, COLORADO SPRINGS, CO 80931-5016
PO BOX 5017, COLORADO SPRINGS, CO 80931-5017
PO BOX 5018, COLORADO SPRINGS, CO 80931-5018
PO BOX 5019, COLORADO SPRINGS, CO 80931-5019
PO BOX 5020, COLORADO SPRINGS, CO 80931-5020
PO BOX 5021, COLORADO SPRINGS, CO 80931-5021
PO BOX 5022, COLORADO SPRINGS, CO 80931-5022
PO BOX 5023, COLORADO SPRINGS, CO 80931-5023
PO BOX 5024, COLORADO SPRINGS, CO 80931-5024
PO BOX 5025, COLORADO SPRINGS, CO 80931-5025
PO BOX 5026, COLORADO SPRINGS, CO 80931-5026
PO BOX 5027, COLORADO SPRINGS, CO 80931-5027
PO BOX 5028, COLORADO SPRINGS, CO 80931-5028
PO BOX 5029, COLORADO SPRINGS, CO 80931-5029
PO BOX 5030, COLORADO SPRINGS, CO 80931-5030
PO BOX 5031, COLORADO SPRINGS, CO 80931-5031
PO BOX 5032, COLORADO SPRINGS, CO 80931-5032
PO BOX 5033, COLORADO SPRINGS, CO 80931-5033
PO BOX 5034, COLORADO SPRINGS, CO 80931-5034
PO BOX 5035, COLORADO SPRINGS, CO 80931-5035
PO BOX 5036, COLORADO SPRINGS, CO 80931-5036
PO BOX 5037, COLORADO SPRINGS, CO 80931-5037
PO BOX 5038, COLORADO SPRINGS, CO 80931-5038
PO BOX 5039, COLORADO SPRINGS, CO 80931-5039
PO BOX 5040, COLORADO SPRINGS, CO 80931-5040
PO BOX 5041, COLORADO SPRINGS, CO 80931-5041
PO BOX 5042, COLORADO SPRINGS, CO 80931-5042
PO BOX 5043, COLORADO SPRINGS, CO 80931-5043
PO BOX 5044, COLORADO SPRINGS, CO 80931-5044
PO BOX 5045, COLORADO SPRINGS, CO 80931-5045
PO BOX 5046, COLORADO SPRINGS, CO 80931-5046
PO BOX 5047, COLORADO SPRINGS, CO 80931-5047
PO BOX 5048, COLORADO SPRINGS, CO 80931-5048
PO BOX 5049, COLORADO SPRINGS, CO 80931-5049
PO BOX 5050, COLORADO SPRINGS, CO 80931-5050
PO BOX 5051, COLORADO SPRINGS, CO 80931-5051
PO BOX 5052, COLORADO SPRINGS, CO 80931-5052
PO BOX 5053, COLORADO SPRINGS, CO 80931-5053
PO BOX 5054, COLORADO SPRINGS, CO 80931-5054
PO BOX 5055, COLORADO SPRINGS, CO 80931-5055
PO BOX 5056, COLORADO SPRINGS, CO 80931-5056
PO BOX 5057, COLORADO SPRINGS, CO 80931-5057
PO BOX 5058, COLORADO SPRINGS, CO 80931-5058
PO BOX 5059, COLORADO SPRINGS, CO 80931-5059
PO BOX 5060, COLORADO SPRINGS, CO 80931-5060
PO BOX 5061, COLORADO SPRINGS, CO 80931-5061
PO BOX 5062, COLORADO SPRINGS, CO 80931-5062
PO BOX 5063, COLORADO SPRINGS, CO 80931-5063
PO BOX 5064, COLORADO SPRINGS, CO 80931-5064
PO BOX 5065, COLORADO SPRINGS, CO 80931-5065
PO BOX 5066, COLORADO SPRINGS, CO 80931-5066
PO BOX 5067, COLORADO SPRINGS, CO 80931-5067
PO BOX 5068, COLORADO SPRINGS, CO 80931-5068
PO BOX 5069, COLORADO SPRINGS, CO 80931-5069
PO BOX 5070, COLORADO SPRINGS, CO 80931-5070
PO BOX 5071, COLORADO SPRINGS, CO 80931-5071
PO BOX 5072, COLORADO SPRINGS, CO 80931-5072
PO BOX 5073, COLORADO SPRINGS, CO 80931-5073
PO BOX 5074, COLORADO SPRINGS, CO 80931-5074
PO BOX 5075, COLORADO SPRINGS, CO 80931-5075
PO BOX 5076, COLORADO SPRINGS, CO 80931-5076
PO BOX 5077, COLORADO SPRINGS, CO 80931-5077
PO BOX 5078, COLORADO SPRINGS, CO 80931-5078
PO BOX 5079, COLORADO SPRINGS, CO 80931-5079
PO BOX 5080, COLORADO SPRINGS, CO 80931-5080
PO BOX 5081, COLORADO SPRINGS, CO 80931-5081
PO BOX 5082, COLORADO SPRINGS, CO 80931-5082
PO BOX 5083, COLORADO SPRINGS, CO 80931-5083
PO BOX 5084, COLORADO SPRINGS, CO 80931-5084
PO BOX 5085, COLORADO SPRINGS, CO 80931-5085
PO BOX 5086, COLORADO SPRINGS, CO 80931-5086
PO BOX 5087, COLORADO SPRINGS, CO 80931-5087
PO BOX 5088, COLORADO SPRINGS, CO 80931-5088
PO BOX 5089, COLORADO SPRINGS, CO 80931-5089
PO BOX 5090, COLORADO SPRINGS, CO 80931-5090
PO BOX 5091, COLORADO SPRINGS, CO 80931-5091
PO BOX 5092, COLORADO SPRINGS, CO 80931-5092
PO BOX 5093, COLORADO SPRINGS, CO 80931-5093
PO BOX 5094, COLORADO SPRINGS, CO 80931-5094
PO BOX 5095, COLORADO SPRINGS, CO 80931-5095
PO BOX 5096, COLORADO SPRINGS, CO 80931-5096
PO BOX 5097, COLORADO SPRINGS, CO 80931-5097
PO BOX 5098, COLORADO SPRINGS, CO 80931-5098
PO BOX 5099, COLORADO SPRINGS, CO 80931-5099
PO BOX 5100, COLORADO SPRINGS, CO 80931-5100
PO BOX 5101, COLORADO SPRINGS, CO 80931-5101
PO BOX 5102, COLORADO SPRINGS, CO 80931-5102
PO BOX 5103, COLORADO SPRINGS, CO 80931-5103
PO BOX 5104, COLORADO SPRINGS, CO 80931-5104
PO BOX 5105, COLORADO SPRINGS, CO 80931-5105
PO BOX 5106, COLORADO SPRINGS, CO 80931-5106
PO BOX 5107, COLORADO SPRINGS, CO 80931-5107
PO BOX 5108, COLORADO SPRINGS, CO 80931-5108
PO BOX 5109, COLORADO SPRINGS, CO 80931-5109
PO BOX 5110, COLORADO SPRINGS, CO 80931-5110
PO BOX 5111, COLORADO SPRINGS, CO 80931-5111
PO BOX 5112, COLORADO SPRINGS, CO 80931-5112
PO BOX 5113, COLORADO SPRINGS, CO 80931-5113
PO BOX 5114, COLORADO SPRINGS, CO 80931-5114
PO BOX 5115, COLORADO SPRINGS, CO 80931-5115
PO BOX 5116, COLORADO SPRINGS, CO 80931-5116
PO BOX 5117, COLORADO SPRINGS, CO 80931-5117
PO BOX 5118, COLORADO SPRINGS, CO 80931-5118
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