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, SWEA CITY, IA 50590-0001
PO BOX 2, SWEA CITY, IA 50590-0002
PO BOX 3, SWEA CITY, IA 50590-0003
PO BOX 4, SWEA CITY, IA 50590-0004
PO BOX 5, SWEA CITY, IA 50590-0005
PO BOX 6, SWEA CITY, IA 50590-0006
PO BOX 7, SWEA CITY, IA 50590-0007
PO BOX 8, SWEA CITY, IA 50590-0008
PO BOX 9, SWEA CITY, IA 50590-0009
PO BOX 10, SWEA CITY, IA 50590-0010
PO BOX 11, SWEA CITY, IA 50590-0011
PO BOX 12, SWEA CITY, IA 50590-0012
PO BOX 13, SWEA CITY, IA 50590-0013
PO BOX 14, SWEA CITY, IA 50590-0014
PO BOX 15, SWEA CITY, IA 50590-0015
PO BOX 16, SWEA CITY, IA 50590-0016
PO BOX 17, SWEA CITY, IA 50590-0017
PO BOX 18, SWEA CITY, IA 50590-0018
PO BOX 19, SWEA CITY, IA 50590-0019
PO BOX 20, SWEA CITY, IA 50590-0020
PO BOX 21, SWEA CITY, IA 50590-0021
PO BOX 22, SWEA CITY, IA 50590-0022
PO BOX 23, SWEA CITY, IA 50590-0023
PO BOX 24, SWEA CITY, IA 50590-0024
PO BOX 25, SWEA CITY, IA 50590-0025
PO BOX 26, SWEA CITY, IA 50590-0026
PO BOX 27, SWEA CITY, IA 50590-0027
PO BOX 28, SWEA CITY, IA 50590-0028
PO BOX 29, SWEA CITY, IA 50590-0029
PO BOX 30, SWEA CITY, IA 50590-0030
PO BOX 31, SWEA CITY, IA 50590-0031
PO BOX 32, SWEA CITY, IA 50590-0032
PO BOX 33, SWEA CITY, IA 50590-0033
PO BOX 34, SWEA CITY, IA 50590-0034
PO BOX 35, SWEA CITY, IA 50590-0035
PO BOX 36, SWEA CITY, IA 50590-0036
PO BOX 37, SWEA CITY, IA 50590-0037
PO BOX 38, SWEA CITY, IA 50590-0038
PO BOX 39, SWEA CITY, IA 50590-0039
PO BOX 40, SWEA CITY, IA 50590-0040
PO BOX 41, SWEA CITY, IA 50590-0041
PO BOX 42, SWEA CITY, IA 50590-0042
PO BOX 43, SWEA CITY, IA 50590-0043
PO BOX 44, SWEA CITY, IA 50590-0044
PO BOX 45, SWEA CITY, IA 50590-0045
PO BOX 46, SWEA CITY, IA 50590-0046
PO BOX 47, SWEA CITY, IA 50590-0047
PO BOX 48, SWEA CITY, IA 50590-0048
PO BOX 49, SWEA CITY, IA 50590-0049
PO BOX 50, SWEA CITY, IA 50590-0050
PO BOX 51, SWEA CITY, IA 50590-0051
PO BOX 52, SWEA CITY, IA 50590-0052
PO BOX 53, SWEA CITY, IA 50590-0053
PO BOX 54, SWEA CITY, IA 50590-0054
PO BOX 55, SWEA CITY, IA 50590-0055
PO BOX 56, SWEA CITY, IA 50590-0056
PO BOX 57, SWEA CITY, IA 50590-0057
PO BOX 58, SWEA CITY, IA 50590-0058
PO BOX 59, SWEA CITY, IA 50590-0059
PO BOX 60, SWEA CITY, IA 50590-0060
PO BOX 61, SWEA CITY, IA 50590-0061
PO BOX 62, SWEA CITY, IA 50590-0062
PO BOX 63, SWEA CITY, IA 50590-0063
PO BOX 64, SWEA CITY, IA 50590-0064
PO BOX 65, SWEA CITY, IA 50590-0065
PO BOX 66, SWEA CITY, IA 50590-0066
PO BOX 67, SWEA CITY, IA 50590-0067
PO BOX 68, SWEA CITY, IA 50590-0068
PO BOX 69, SWEA CITY, IA 50590-0069
PO BOX 70, SWEA CITY, IA 50590-0070
PO BOX 71, SWEA CITY, IA 50590-0071
PO BOX 72, SWEA CITY, IA 50590-0072
PO BOX 73, SWEA CITY, IA 50590-0073
PO BOX 74, SWEA CITY, IA 50590-0074
PO BOX 75, SWEA CITY, IA 50590-0075
PO BOX 76, SWEA CITY, IA 50590-0076
PO BOX 77, SWEA CITY, IA 50590-0077
PO BOX 78, SWEA CITY, IA 50590-0078
PO BOX 79, SWEA CITY, IA 50590-0079
PO BOX 80, SWEA CITY, IA 50590-0080
PO BOX 81, SWEA CITY, IA 50590-0081
PO BOX 82, SWEA CITY, IA 50590-0082
PO BOX 83, SWEA CITY, IA 50590-0083
PO BOX 84, SWEA CITY, IA 50590-0084
PO BOX 85, SWEA CITY, IA 50590-0085
PO BOX 86, SWEA CITY, IA 50590-0086
PO BOX 87, SWEA CITY, IA 50590-0087
PO BOX 88, SWEA CITY, IA 50590-0088
PO BOX 89, SWEA CITY, IA 50590-0089
PO BOX 90, SWEA CITY, IA 50590-0090
PO BOX 91, SWEA CITY, IA 50590-0091
PO BOX 92, SWEA CITY, IA 50590-0092
PO BOX 93, SWEA CITY, IA 50590-0093
PO BOX 94, SWEA CITY, IA 50590-0094
PO BOX 95, SWEA CITY, IA 50590-0095
PO BOX 96, SWEA CITY, IA 50590-0096
PO BOX 97, SWEA CITY, IA 50590-0097
PO BOX 98, SWEA CITY, IA 50590-0098
PO BOX 99, SWEA CITY, IA 50590-0099
PO BOX 100, SWEA CITY, IA 50590-0100
PO BOX 101, SWEA CITY, IA 50590-0101
PO BOX 102, SWEA CITY, IA 50590-0102
PO BOX 103, SWEA CITY, IA 50590-0103
PO BOX 104, SWEA CITY, IA 50590-0104
PO BOX 105, SWEA CITY, IA 50590-0105
PO BOX 106, SWEA CITY, IA 50590-0106
PO BOX 107, SWEA CITY, IA 50590-0107
PO BOX 108, SWEA CITY, IA 50590-0108
PO BOX 109, SWEA CITY, IA 50590-0109
PO BOX 110, SWEA CITY, IA 50590-0110
PO BOX 111, SWEA CITY, IA 50590-0111
PO BOX 112, SWEA CITY, IA 50590-0112
PO BOX 113, SWEA CITY, IA 50590-0113
PO BOX 114, SWEA CITY, IA 50590-0114
PO BOX 115, SWEA CITY, IA 50590-0115
PO BOX 116, SWEA CITY, IA 50590-0116
PO BOX 117, SWEA CITY, IA 50590-0117
PO BOX 118, SWEA CITY, IA 50590-0118
PO BOX 119, SWEA CITY, IA 50590-0119
PO BOX 120, SWEA CITY, IA 50590-0120
PO BOX 121, SWEA CITY, IA 50590-0121
PO BOX 122, SWEA CITY, IA 50590-0122
PO BOX 123, SWEA CITY, IA 50590-0123
PO BOX 124, SWEA CITY, IA 50590-0124
PO BOX 125, SWEA CITY, IA 50590-0125
PO BOX 126, SWEA CITY, IA 50590-0126
PO BOX 127, SWEA CITY, IA 50590-0127
PO BOX 128, SWEA CITY, IA 50590-0128
PO BOX 129, SWEA CITY, IA 50590-0129
PO BOX 130, SWEA CITY, IA 50590-0130
PO BOX 131, SWEA CITY, IA 50590-0131
PO BOX 132, SWEA CITY, IA 50590-0132
PO BOX 133, SWEA CITY, IA 50590-0133
PO BOX 134, SWEA CITY, IA 50590-0134
PO BOX 135, SWEA CITY, IA 50590-0135
PO BOX 136, SWEA CITY, IA 50590-0136
PO BOX 137, SWEA CITY, IA 50590-0137
PO BOX 138, SWEA CITY, IA 50590-0138
PO BOX 139, SWEA CITY, IA 50590-0139
PO BOX 140, SWEA CITY, IA 50590-0140
PO BOX 141, SWEA CITY, IA 50590-0141
PO BOX 142, SWEA CITY, IA 50590-0142
PO BOX 143, SWEA CITY, IA 50590-0143
PO BOX 144, SWEA CITY, IA 50590-0144
PO BOX 145, SWEA CITY, IA 50590-0145
PO BOX 146, SWEA CITY, IA 50590-0146
PO BOX 147, SWEA CITY, IA 50590-0147
PO BOX 148, SWEA CITY, IA 50590-0148
PO BOX 149, SWEA CITY, IA 50590-0149
PO BOX 150, SWEA CITY, IA 50590-0150
PO BOX 151, SWEA CITY, IA 50590-0151
PO BOX 152, SWEA CITY, IA 50590-0152
PO BOX 153, SWEA CITY, IA 50590-0153
PO BOX 154, SWEA CITY, IA 50590-0154
PO BOX 155, SWEA CITY, IA 50590-0155
PO BOX 156, SWEA CITY, IA 50590-0156
PO BOX 157, SWEA CITY, IA 50590-0157
PO BOX 158, SWEA CITY, IA 50590-0158
PO BOX 159, SWEA CITY, IA 50590-0159
PO BOX 160, SWEA CITY, IA 50590-0160
PO BOX 161, SWEA CITY, IA 50590-0161
PO BOX 162, SWEA CITY, IA 50590-0162
PO BOX 163, SWEA CITY, IA 50590-0163
PO BOX 164, SWEA CITY, IA 50590-0164
PO BOX 165, SWEA CITY, IA 50590-0165
PO BOX 166, SWEA CITY, IA 50590-0166
PO BOX 167, SWEA CITY, IA 50590-0167
PO BOX 168, SWEA CITY, IA 50590-0168
PO BOX 169, SWEA CITY, IA 50590-0169
PO BOX 170, SWEA CITY, IA 50590-0170
PO BOX 171, SWEA CITY, IA 50590-0171
PO BOX 172, SWEA CITY, IA 50590-0172
PO BOX 173, SWEA CITY, IA 50590-0173
PO BOX 174, SWEA CITY, IA 50590-0174
PO BOX 175, SWEA CITY, IA 50590-0175
PO BOX 176, SWEA CITY, IA 50590-0176
PO BOX 177, SWEA CITY, IA 50590-0177
PO BOX 178, SWEA CITY, IA 50590-0178
PO BOX 179, SWEA CITY, IA 50590-0179
PO BOX 180, SWEA CITY, IA 50590-0180
PO BOX 181, SWEA CITY, IA 50590-0181
PO BOX 182, SWEA CITY, IA 50590-0182
PO BOX 183, SWEA CITY, IA 50590-0183
PO BOX 184, SWEA CITY, IA 50590-0184
PO BOX 185, SWEA CITY, IA 50590-0185
PO BOX 186, SWEA CITY, IA 50590-0186
PO BOX 187, SWEA CITY, IA 50590-0187
PO BOX 188, SWEA CITY, IA 50590-0188
PO BOX 189, SWEA CITY, IA 50590-0189
PO BOX 190, SWEA CITY, IA 50590-0190
PO BOX 191, SWEA CITY, IA 50590-0191
PO BOX 192, SWEA CITY, IA 50590-0192
PO BOX 193, SWEA CITY, IA 50590-0193
PO BOX 194, SWEA CITY, IA 50590-0194
PO BOX 195, SWEA CITY, IA 50590-0195
PO BOX 196, SWEA CITY, IA 50590-0196
PO BOX 197, SWEA CITY, IA 50590-0197
PO BOX 198, SWEA CITY, IA 50590-0198
PO BOX 199, SWEA CITY, IA 50590-0199
PO BOX 200, SWEA CITY, IA 50590-0200
PO BOX 201, SWEA CITY, IA 50590-0201
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