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, GLADBROOK, IA 50635-0001
PO BOX 2, GLADBROOK, IA 50635-0002
PO BOX 3, GLADBROOK, IA 50635-0003
PO BOX 4, GLADBROOK, IA 50635-0004
PO BOX 5, GLADBROOK, IA 50635-0005
PO BOX 6, GLADBROOK, IA 50635-0006
PO BOX 7, GLADBROOK, IA 50635-0007
PO BOX 8, GLADBROOK, IA 50635-0008
PO BOX 9, GLADBROOK, IA 50635-0009
PO BOX 10, GLADBROOK, IA 50635-0010
PO BOX 11, GLADBROOK, IA 50635-0011
PO BOX 12, GLADBROOK, IA 50635-0012
PO BOX 13, GLADBROOK, IA 50635-0013
PO BOX 14, GLADBROOK, IA 50635-0014
PO BOX 15, GLADBROOK, IA 50635-0015
PO BOX 16, GLADBROOK, IA 50635-0016
PO BOX 17, GLADBROOK, IA 50635-0017
PO BOX 18, GLADBROOK, IA 50635-0018
PO BOX 19, GLADBROOK, IA 50635-0019
PO BOX 20, GLADBROOK, IA 50635-0020
PO BOX 21, GLADBROOK, IA 50635-0021
PO BOX 22, GLADBROOK, IA 50635-0022
PO BOX 23, GLADBROOK, IA 50635-0023
PO BOX 24, GLADBROOK, IA 50635-0024
PO BOX 25, GLADBROOK, IA 50635-0025
PO BOX 26, GLADBROOK, IA 50635-0026
PO BOX 27, GLADBROOK, IA 50635-0027
PO BOX 28, GLADBROOK, IA 50635-0028
PO BOX 29, GLADBROOK, IA 50635-0029
PO BOX 30, GLADBROOK, IA 50635-0030
PO BOX 31, GLADBROOK, IA 50635-0031
PO BOX 32, GLADBROOK, IA 50635-0032
PO BOX 33, GLADBROOK, IA 50635-0033
PO BOX 34, GLADBROOK, IA 50635-0034
PO BOX 35, GLADBROOK, IA 50635-0035
PO BOX 36, GLADBROOK, IA 50635-0036
PO BOX 37, GLADBROOK, IA 50635-0037
PO BOX 38, GLADBROOK, IA 50635-0038
PO BOX 39, GLADBROOK, IA 50635-0039
PO BOX 40, GLADBROOK, IA 50635-0040
PO BOX 41, GLADBROOK, IA 50635-0041
PO BOX 42, GLADBROOK, IA 50635-0042
PO BOX 43, GLADBROOK, IA 50635-0043
PO BOX 44, GLADBROOK, IA 50635-0044
PO BOX 45, GLADBROOK, IA 50635-0045
PO BOX 46, GLADBROOK, IA 50635-0046
PO BOX 47, GLADBROOK, IA 50635-0047
PO BOX 48, GLADBROOK, IA 50635-0048
PO BOX 49, GLADBROOK, IA 50635-0049
PO BOX 50, GLADBROOK, IA 50635-0050
PO BOX 51, GLADBROOK, IA 50635-0051
PO BOX 52, GLADBROOK, IA 50635-0052
PO BOX 53, GLADBROOK, IA 50635-0053
PO BOX 54, GLADBROOK, IA 50635-0054
PO BOX 55, GLADBROOK, IA 50635-0055
PO BOX 56, GLADBROOK, IA 50635-0056
PO BOX 57, GLADBROOK, IA 50635-0057
PO BOX 58, GLADBROOK, IA 50635-0058
PO BOX 59, GLADBROOK, IA 50635-0059
PO BOX 60, GLADBROOK, IA 50635-0060
PO BOX 61, GLADBROOK, IA 50635-0061
PO BOX 62, GLADBROOK, IA 50635-0062
PO BOX 63, GLADBROOK, IA 50635-0063
PO BOX 64, GLADBROOK, IA 50635-0064
PO BOX 65, GLADBROOK, IA 50635-0065
PO BOX 66, GLADBROOK, IA 50635-0066
PO BOX 67, GLADBROOK, IA 50635-0067
PO BOX 68, GLADBROOK, IA 50635-0068
PO BOX 69, GLADBROOK, IA 50635-0069
PO BOX 70, GLADBROOK, IA 50635-0070
PO BOX 71, GLADBROOK, IA 50635-0071
PO BOX 72, GLADBROOK, IA 50635-0072
PO BOX 73, GLADBROOK, IA 50635-0073
PO BOX 74, GLADBROOK, IA 50635-0074
PO BOX 75, GLADBROOK, IA 50635-0075
PO BOX 76, GLADBROOK, IA 50635-0076
PO BOX 77, GLADBROOK, IA 50635-0077
PO BOX 78, GLADBROOK, IA 50635-0078
PO BOX 79, GLADBROOK, IA 50635-0079
PO BOX 80, GLADBROOK, IA 50635-0080
PO BOX 81, GLADBROOK, IA 50635-0081
PO BOX 82, GLADBROOK, IA 50635-0082
PO BOX 83, GLADBROOK, IA 50635-0083
PO BOX 84, GLADBROOK, IA 50635-0084
PO BOX 85, GLADBROOK, IA 50635-0085
PO BOX 86, GLADBROOK, IA 50635-0086
PO BOX 87, GLADBROOK, IA 50635-0087
PO BOX 88, GLADBROOK, IA 50635-0088
PO BOX 89, GLADBROOK, IA 50635-0089
PO BOX 90, GLADBROOK, IA 50635-0090
PO BOX 91, GLADBROOK, IA 50635-0091
PO BOX 92, GLADBROOK, IA 50635-0092
PO BOX 93, GLADBROOK, IA 50635-0093
PO BOX 94, GLADBROOK, IA 50635-0094
PO BOX 95, GLADBROOK, IA 50635-0095
PO BOX 96, GLADBROOK, IA 50635-0096
PO BOX 97, GLADBROOK, IA 50635-0097
PO BOX 98, GLADBROOK, IA 50635-0098
PO BOX 99, GLADBROOK, IA 50635-0099
PO BOX 100, GLADBROOK, IA 50635-0100
PO BOX 101, GLADBROOK, IA 50635-0101
PO BOX 102, GLADBROOK, IA 50635-0102
PO BOX 103, GLADBROOK, IA 50635-0103
PO BOX 104, GLADBROOK, IA 50635-0104
PO BOX 105, GLADBROOK, IA 50635-0105
PO BOX 106, GLADBROOK, IA 50635-0106
PO BOX 107, GLADBROOK, IA 50635-0107
PO BOX 108, GLADBROOK, IA 50635-0108
PO BOX 109, GLADBROOK, IA 50635-0109
PO BOX 110, GLADBROOK, IA 50635-0110
PO BOX 111, GLADBROOK, IA 50635-0111
PO BOX 112, GLADBROOK, IA 50635-0112
PO BOX 113, GLADBROOK, IA 50635-0113
PO BOX 114, GLADBROOK, IA 50635-0114
PO BOX 115, GLADBROOK, IA 50635-0115
PO BOX 116, GLADBROOK, IA 50635-0116
PO BOX 117, GLADBROOK, IA 50635-0117
PO BOX 118, GLADBROOK, IA 50635-0118
PO BOX 119, GLADBROOK, IA 50635-0119
PO BOX 120, GLADBROOK, IA 50635-0120
PO BOX 121, GLADBROOK, IA 50635-0121
PO BOX 122, GLADBROOK, IA 50635-0122
PO BOX 123, GLADBROOK, IA 50635-0123
PO BOX 124, GLADBROOK, IA 50635-0124
PO BOX 125, GLADBROOK, IA 50635-0125
PO BOX 126, GLADBROOK, IA 50635-0126
PO BOX 127, GLADBROOK, IA 50635-0127
PO BOX 128, GLADBROOK, IA 50635-0128
PO BOX 129, GLADBROOK, IA 50635-0129
PO BOX 130, GLADBROOK, IA 50635-0130
PO BOX 131, GLADBROOK, IA 50635-0131
PO BOX 132, GLADBROOK, IA 50635-0132
PO BOX 133, GLADBROOK, IA 50635-0133
PO BOX 134, GLADBROOK, IA 50635-0134
PO BOX 135, GLADBROOK, IA 50635-0135
PO BOX 136, GLADBROOK, IA 50635-0136
PO BOX 137, GLADBROOK, IA 50635-0137
PO BOX 138, GLADBROOK, IA 50635-0138
PO BOX 139, GLADBROOK, IA 50635-0139
PO BOX 140, GLADBROOK, IA 50635-0140
PO BOX 141, GLADBROOK, IA 50635-0141
PO BOX 142, GLADBROOK, IA 50635-0142
PO BOX 143, GLADBROOK, IA 50635-0143
PO BOX 144, GLADBROOK, IA 50635-0144
PO BOX 145, GLADBROOK, IA 50635-0145
PO BOX 146, GLADBROOK, IA 50635-0146
PO BOX 147, GLADBROOK, IA 50635-0147
PO BOX 148, GLADBROOK, IA 50635-0148
PO BOX 149, GLADBROOK, IA 50635-0149
PO BOX 150, GLADBROOK, IA 50635-0150
PO BOX 151, GLADBROOK, IA 50635-0151
PO BOX 152, GLADBROOK, IA 50635-0152
PO BOX 153, GLADBROOK, IA 50635-0153
PO BOX 154, GLADBROOK, IA 50635-0154
PO BOX 155, GLADBROOK, IA 50635-0155
PO BOX 156, GLADBROOK, IA 50635-0156
PO BOX 157, GLADBROOK, IA 50635-0157
PO BOX 158, GLADBROOK, IA 50635-0158
PO BOX 159, GLADBROOK, IA 50635-0159
PO BOX 160, GLADBROOK, IA 50635-0160
PO BOX 161, GLADBROOK, IA 50635-0161
PO BOX 162, GLADBROOK, IA 50635-0162
PO BOX 163, GLADBROOK, IA 50635-0163
PO BOX 164, GLADBROOK, IA 50635-0164
PO BOX 165, GLADBROOK, IA 50635-0165
PO BOX 166, GLADBROOK, IA 50635-0166
PO BOX 167, GLADBROOK, IA 50635-0167
PO BOX 168, GLADBROOK, IA 50635-0168
PO BOX 169, GLADBROOK, IA 50635-0169
PO BOX 170, GLADBROOK, IA 50635-0170
PO BOX 171, GLADBROOK, IA 50635-0171
PO BOX 172, GLADBROOK, IA 50635-0172
PO BOX 173, GLADBROOK, IA 50635-0173
PO BOX 174, GLADBROOK, IA 50635-0174
PO BOX 175, GLADBROOK, IA 50635-0175
PO BOX 176, GLADBROOK, IA 50635-0176
PO BOX 177, GLADBROOK, IA 50635-0177
PO BOX 178, GLADBROOK, IA 50635-0178
PO BOX 179, GLADBROOK, IA 50635-0179
PO BOX 180, GLADBROOK, IA 50635-0180
PO BOX 181, GLADBROOK, IA 50635-0181
PO BOX 182, GLADBROOK, IA 50635-0182
PO BOX 183, GLADBROOK, IA 50635-0183
PO BOX 184, GLADBROOK, IA 50635-0184
PO BOX 185, GLADBROOK, IA 50635-0185
PO BOX 186, GLADBROOK, IA 50635-0186
PO BOX 187, GLADBROOK, IA 50635-0187
PO BOX 188, GLADBROOK, IA 50635-0188
PO BOX 189, GLADBROOK, IA 50635-0189
PO BOX 190, GLADBROOK, IA 50635-0190
PO BOX 191, GLADBROOK, IA 50635-0191
PO BOX 192, GLADBROOK, IA 50635-0192
PO BOX 193, GLADBROOK, IA 50635-0193
PO BOX 194, GLADBROOK, IA 50635-0194
PO BOX 195, GLADBROOK, IA 50635-0195
PO BOX 196, GLADBROOK, IA 50635-0196
PO BOX 197, GLADBROOK, IA 50635-0197
PO BOX 198, GLADBROOK, IA 50635-0198
PO BOX 199, GLADBROOK, IA 50635-0199
PO BOX 200, GLADBROOK, IA 50635-0200
PO BOX 201, GLADBROOK, IA 50635-0201
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