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 1, IOWA CITY, IA 52244-0001
PO BOX 2, IOWA CITY, IA 52244-0002
PO BOX 3, IOWA CITY, IA 52244-0003
PO BOX 4, IOWA CITY, IA 52244-0004
PO BOX 5, IOWA CITY, IA 52244-0005
PO BOX 6, IOWA CITY, IA 52244-0006
PO BOX 7, IOWA CITY, IA 52244-0007
PO BOX 8, IOWA CITY, IA 52244-0008
PO BOX 9, IOWA CITY, IA 52244-0009
PO BOX 10, IOWA CITY, IA 52244-0010
PO BOX 11, IOWA CITY, IA 52244-0011
PO BOX 12, IOWA CITY, IA 52244-0012
PO BOX 13, IOWA CITY, IA 52244-0013
PO BOX 14, IOWA CITY, IA 52244-0014
PO BOX 15, IOWA CITY, IA 52244-0015
PO BOX 16, IOWA CITY, IA 52244-0016
PO BOX 17, IOWA CITY, IA 52244-0017
PO BOX 18, IOWA CITY, IA 52244-0018
PO BOX 19, IOWA CITY, IA 52244-0019
PO BOX 20, IOWA CITY, IA 52244-0020
PO BOX 21, IOWA CITY, IA 52244-0021
PO BOX 22, IOWA CITY, IA 52244-0022
PO BOX 23, IOWA CITY, IA 52244-0023
PO BOX 24, IOWA CITY, IA 52244-0024
PO BOX 25, IOWA CITY, IA 52244-0025
PO BOX 26, IOWA CITY, IA 52244-0026
PO BOX 27, IOWA CITY, IA 52244-0027
PO BOX 28, IOWA CITY, IA 52244-0028
PO BOX 29, IOWA CITY, IA 52244-0029
PO BOX 30, IOWA CITY, IA 52244-0030
PO BOX 31, IOWA CITY, IA 52244-0031
PO BOX 32, IOWA CITY, IA 52244-0032
PO BOX 33, IOWA CITY, IA 52244-0033
PO BOX 34, IOWA CITY, IA 52244-0034
PO BOX 35, IOWA CITY, IA 52244-0035
PO BOX 36, IOWA CITY, IA 52244-0036
PO BOX 37, IOWA CITY, IA 52244-0037
PO BOX 38, IOWA CITY, IA 52244-0038
PO BOX 39, IOWA CITY, IA 52244-0039
PO BOX 40, IOWA CITY, IA 52244-0040
PO BOX 41, IOWA CITY, IA 52244-0041
PO BOX 42, IOWA CITY, IA 52244-0042
PO BOX 43, IOWA CITY, IA 52244-0043
PO BOX 44, IOWA CITY, IA 52244-0044
PO BOX 45, IOWA CITY, IA 52244-0045
PO BOX 46, IOWA CITY, IA 52244-0046
PO BOX 47, IOWA CITY, IA 52244-0047
PO BOX 48, IOWA CITY, IA 52244-0048
PO BOX 49, IOWA CITY, IA 52244-0049
PO BOX 50, IOWA CITY, IA 52244-0050
PO BOX 51, IOWA CITY, IA 52244-0051
PO BOX 52, IOWA CITY, IA 52244-0052
PO BOX 53, IOWA CITY, IA 52244-0053
PO BOX 54, IOWA CITY, IA 52244-0054
PO BOX 55, IOWA CITY, IA 52244-0055
PO BOX 56, IOWA CITY, IA 52244-0056
PO BOX 57, IOWA CITY, IA 52244-0057
PO BOX 58, IOWA CITY, IA 52244-0058
PO BOX 59, IOWA CITY, IA 52244-0059
PO BOX 60, IOWA CITY, IA 52244-0060
PO BOX 61, IOWA CITY, IA 52244-0061
PO BOX 62, IOWA CITY, IA 52244-0062
PO BOX 63, IOWA CITY, IA 52244-0063
PO BOX 64, IOWA CITY, IA 52244-0064
PO BOX 65, IOWA CITY, IA 52244-0065
PO BOX 66, IOWA CITY, IA 52244-0066
PO BOX 67, IOWA CITY, IA 52244-0067
PO BOX 68, IOWA CITY, IA 52244-0068
PO BOX 69, IOWA CITY, IA 52244-0069
PO BOX 70, IOWA CITY, IA 52244-0070
PO BOX 71, IOWA CITY, IA 52244-0071
PO BOX 72, IOWA CITY, IA 52244-0072
PO BOX 73, IOWA CITY, IA 52244-0073
PO BOX 74, IOWA CITY, IA 52244-0074
PO BOX 75, IOWA CITY, IA 52244-0075
PO BOX 76, IOWA CITY, IA 52244-0076
PO BOX 77, IOWA CITY, IA 52244-0077
PO BOX 78, IOWA CITY, IA 52244-0078
PO BOX 79, IOWA CITY, IA 52244-0079
PO BOX 80, IOWA CITY, IA 52244-0080
PO BOX 81, IOWA CITY, IA 52244-0081
PO BOX 82, IOWA CITY, IA 52244-0082
PO BOX 83, IOWA CITY, IA 52244-0083
PO BOX 84, IOWA CITY, IA 52244-0084
PO BOX 85, IOWA CITY, IA 52244-0085
PO BOX 86, IOWA CITY, IA 52244-0086
PO BOX 87, IOWA CITY, IA 52244-0087
PO BOX 88, IOWA CITY, IA 52244-0088
PO BOX 89, IOWA CITY, IA 52244-0089
PO BOX 90, IOWA CITY, IA 52244-0090
PO BOX 91, IOWA CITY, IA 52244-0091
PO BOX 92, IOWA CITY, IA 52244-0092
PO BOX 93, IOWA CITY, IA 52244-0093
PO BOX 94, IOWA CITY, IA 52244-0094
PO BOX 95, IOWA CITY, IA 52244-0095
PO BOX 96, IOWA CITY, IA 52244-0096
PO BOX 97, IOWA CITY, IA 52244-0097
PO BOX 98, IOWA CITY, IA 52244-0098
PO BOX 99, IOWA CITY, IA 52244-0099
PO BOX 100, IOWA CITY, IA 52244-0100
PO BOX 101, IOWA CITY, IA 52244-0101
PO BOX 102, IOWA CITY, IA 52244-0102
PO BOX 103, IOWA CITY, IA 52244-0103
PO BOX 104, IOWA CITY, IA 52244-0104
PO BOX 105, IOWA CITY, IA 52244-0105
PO BOX 106, IOWA CITY, IA 52244-0106
PO BOX 107, IOWA CITY, IA 52244-0107
PO BOX 108, IOWA CITY, IA 52244-0108
PO BOX 109, IOWA CITY, IA 52244-0109
PO BOX 110, IOWA CITY, IA 52244-0110
PO BOX 111, IOWA CITY, IA 52244-0111
PO BOX 112, IOWA CITY, IA 52244-0112
PO BOX 113, IOWA CITY, IA 52244-0113
PO BOX 114, IOWA CITY, IA 52244-0114
PO BOX 115, IOWA CITY, IA 52244-0115
PO BOX 116, IOWA CITY, IA 52244-0116
PO BOX 117, IOWA CITY, IA 52244-0117
PO BOX 118, IOWA CITY, IA 52244-0118
PO BOX 119, IOWA CITY, IA 52244-0119
PO BOX 120, IOWA CITY, IA 52244-0120
PO BOX 121, IOWA CITY, IA 52244-0121
PO BOX 122, IOWA CITY, IA 52244-0122
PO BOX 123, IOWA CITY, IA 52244-0123
PO BOX 124, IOWA CITY, IA 52244-0124
PO BOX 125, IOWA CITY, IA 52244-0125
PO BOX 126, IOWA CITY, IA 52244-0126
PO BOX 127, IOWA CITY, IA 52244-0127
PO BOX 128, IOWA CITY, IA 52244-0128
PO BOX 129, IOWA CITY, IA 52244-0129
PO BOX 130, IOWA CITY, IA 52244-0130
PO BOX 131, IOWA CITY, IA 52244-0131
PO BOX 132, IOWA CITY, IA 52244-0132
PO BOX 133, IOWA CITY, IA 52244-0133
PO BOX 134, IOWA CITY, IA 52244-0134
PO BOX 135, IOWA CITY, IA 52244-0135
PO BOX 136, IOWA CITY, IA 52244-0136
PO BOX 137, IOWA CITY, IA 52244-0137
PO BOX 138, IOWA CITY, IA 52244-0138
PO BOX 139, IOWA CITY, IA 52244-0139
PO BOX 140, IOWA CITY, IA 52244-0140
PO BOX 141, IOWA CITY, IA 52244-0141
PO BOX 142, IOWA CITY, IA 52244-0142
PO BOX 143, IOWA CITY, IA 52244-0143
PO BOX 144, IOWA CITY, IA 52244-0144
PO BOX 145, IOWA CITY, IA 52244-0145
PO BOX 146, IOWA CITY, IA 52244-0146
PO BOX 147, IOWA CITY, IA 52244-0147
PO BOX 148, IOWA CITY, IA 52244-0148
PO BOX 149, IOWA CITY, IA 52244-0149
PO BOX 150, IOWA CITY, IA 52244-0150
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