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 21, EAGLE GROVE, IA 50533-0021
PO BOX 22, EAGLE GROVE, IA 50533-0022
PO BOX 23, EAGLE GROVE, IA 50533-0023
PO BOX 24, EAGLE GROVE, IA 50533-0024
PO BOX 25, EAGLE GROVE, IA 50533-0025
PO BOX 26, EAGLE GROVE, IA 50533-0026
PO BOX 27, EAGLE GROVE, IA 50533-0027
PO BOX 28, EAGLE GROVE, IA 50533-0028
PO BOX 29, EAGLE GROVE, IA 50533-0029
PO BOX 30, EAGLE GROVE, IA 50533-0030
PO BOX 31, EAGLE GROVE, IA 50533-0031
PO BOX 32, EAGLE GROVE, IA 50533-0032
PO BOX 33, EAGLE GROVE, IA 50533-0033
PO BOX 34, EAGLE GROVE, IA 50533-0034
PO BOX 35, EAGLE GROVE, IA 50533-0035
PO BOX 36, EAGLE GROVE, IA 50533-0036
PO BOX 37, EAGLE GROVE, IA 50533-0037
PO BOX 38, EAGLE GROVE, IA 50533-0038
PO BOX 39, EAGLE GROVE, IA 50533-0039
PO BOX 40, EAGLE GROVE, IA 50533-0040
PO BOX 41, EAGLE GROVE, IA 50533-0041
PO BOX 42, EAGLE GROVE, IA 50533-0042
PO BOX 43, EAGLE GROVE, IA 50533-0043
PO BOX 44, EAGLE GROVE, IA 50533-0044
PO BOX 45, EAGLE GROVE, IA 50533-0045
PO BOX 46, EAGLE GROVE, IA 50533-0046
PO BOX 47, EAGLE GROVE, IA 50533-0047
PO BOX 48, EAGLE GROVE, IA 50533-0048
PO BOX 49, EAGLE GROVE, IA 50533-0049
PO BOX 50, EAGLE GROVE, IA 50533-0050
PO BOX 51, EAGLE GROVE, IA 50533-0051
PO BOX 52, EAGLE GROVE, IA 50533-0052
PO BOX 53, EAGLE GROVE, IA 50533-0053
PO BOX 54, EAGLE GROVE, IA 50533-0054
PO BOX 55, EAGLE GROVE, IA 50533-0055
PO BOX 56, EAGLE GROVE, IA 50533-0056
PO BOX 57, EAGLE GROVE, IA 50533-0057
PO BOX 58, EAGLE GROVE, IA 50533-0058
PO BOX 59, EAGLE GROVE, IA 50533-0059
PO BOX 60, EAGLE GROVE, IA 50533-0060
PO BOX 61, EAGLE GROVE, IA 50533-0061
PO BOX 62, EAGLE GROVE, IA 50533-0062
PO BOX 63, EAGLE GROVE, IA 50533-0063
PO BOX 64, EAGLE GROVE, IA 50533-0064
PO BOX 65, EAGLE GROVE, IA 50533-0065
PO BOX 66, EAGLE GROVE, IA 50533-0066
PO BOX 67, EAGLE GROVE, IA 50533-0067
PO BOX 68, EAGLE GROVE, IA 50533-0068
PO BOX 69, EAGLE GROVE, IA 50533-0069
PO BOX 70, EAGLE GROVE, IA 50533-0070
PO BOX 71, EAGLE GROVE, IA 50533-0071
PO BOX 72, EAGLE GROVE, IA 50533-0072
PO BOX 73, EAGLE GROVE, IA 50533-0073
PO BOX 74, EAGLE GROVE, IA 50533-0074
PO BOX 75, EAGLE GROVE, IA 50533-0075
PO BOX 76, EAGLE GROVE, IA 50533-0076
PO BOX 77, EAGLE GROVE, IA 50533-0077
PO BOX 78, EAGLE GROVE, IA 50533-0078
PO BOX 79, EAGLE GROVE, IA 50533-0079
PO BOX 80, EAGLE GROVE, IA 50533-0080
PO BOX 81, EAGLE GROVE, IA 50533-0081
PO BOX 82, EAGLE GROVE, IA 50533-0082
PO BOX 83, EAGLE GROVE, IA 50533-0083
PO BOX 84, EAGLE GROVE, IA 50533-0084
PO BOX 85, EAGLE GROVE, IA 50533-0085
PO BOX 86, EAGLE GROVE, IA 50533-0086
PO BOX 87, EAGLE GROVE, IA 50533-0087
PO BOX 88, EAGLE GROVE, IA 50533-0088
PO BOX 89, EAGLE GROVE, IA 50533-0089
PO BOX 90, EAGLE GROVE, IA 50533-0090
PO BOX 91, EAGLE GROVE, IA 50533-0091
PO BOX 92, EAGLE GROVE, IA 50533-0092
PO BOX 93, EAGLE GROVE, IA 50533-0093
PO BOX 94, EAGLE GROVE, IA 50533-0094
PO BOX 95, EAGLE GROVE, IA 50533-0095
PO BOX 96, EAGLE GROVE, IA 50533-0096
PO BOX 97, EAGLE GROVE, IA 50533-0097
PO BOX 98, EAGLE GROVE, IA 50533-0098
PO BOX 99, EAGLE GROVE, IA 50533-0099
PO BOX 100, EAGLE GROVE, IA 50533-0100
PO BOX 101, EAGLE GROVE, IA 50533-0101
PO BOX 102, EAGLE GROVE, IA 50533-0102
PO BOX 103, EAGLE GROVE, IA 50533-0103
PO BOX 104, EAGLE GROVE, IA 50533-0104
PO BOX 105, EAGLE GROVE, IA 50533-0105
PO BOX 106, EAGLE GROVE, IA 50533-0106
PO BOX 107, EAGLE GROVE, IA 50533-0107
PO BOX 108, EAGLE GROVE, IA 50533-0108
PO BOX 109, EAGLE GROVE, IA 50533-0109
PO BOX 110, EAGLE GROVE, IA 50533-0110
PO BOX 111, EAGLE GROVE, IA 50533-0111
PO BOX 112, EAGLE GROVE, IA 50533-0112
PO BOX 113, EAGLE GROVE, IA 50533-0113
PO BOX 114, EAGLE GROVE, IA 50533-0114
PO BOX 115, EAGLE GROVE, IA 50533-0115
PO BOX 116, EAGLE GROVE, IA 50533-0116
PO BOX 117, EAGLE GROVE, IA 50533-0117
PO BOX 118, EAGLE GROVE, IA 50533-0118
PO BOX 119, EAGLE GROVE, IA 50533-0119
PO BOX 120, EAGLE GROVE, IA 50533-0120
PO BOX 121, EAGLE GROVE, IA 50533-0121
PO BOX 122, EAGLE GROVE, IA 50533-0122
PO BOX 123, EAGLE GROVE, IA 50533-0123
PO BOX 124, EAGLE GROVE, IA 50533-0124
PO BOX 125, EAGLE GROVE, IA 50533-0125
PO BOX 126, EAGLE GROVE, IA 50533-0126
PO BOX 127, EAGLE GROVE, IA 50533-0127
PO BOX 128, EAGLE GROVE, IA 50533-0128
PO BOX 129, EAGLE GROVE, IA 50533-0129
PO BOX 130, EAGLE GROVE, IA 50533-0130
PO BOX 131, EAGLE GROVE, IA 50533-0131
PO BOX 132, EAGLE GROVE, IA 50533-0132
PO BOX 133, EAGLE GROVE, IA 50533-0133
PO BOX 134, EAGLE GROVE, IA 50533-0134
PO BOX 135, EAGLE GROVE, IA 50533-0135
PO BOX 136, EAGLE GROVE, IA 50533-0136
PO BOX 137, EAGLE GROVE, IA 50533-0137
PO BOX 138, EAGLE GROVE, IA 50533-0138
PO BOX 139, EAGLE GROVE, IA 50533-0139
PO BOX 140, EAGLE GROVE, IA 50533-0140
PO BOX 141, EAGLE GROVE, IA 50533-0141
PO BOX 142, EAGLE GROVE, IA 50533-0142
PO BOX 143, EAGLE GROVE, IA 50533-0143
PO BOX 144, EAGLE GROVE, IA 50533-0144
PO BOX 145, EAGLE GROVE, IA 50533-0145
PO BOX 146, EAGLE GROVE, IA 50533-0146
PO BOX 147, EAGLE GROVE, IA 50533-0147
PO BOX 148, EAGLE GROVE, IA 50533-0148
PO BOX 149, EAGLE GROVE, IA 50533-0149
PO BOX 150, EAGLE GROVE, IA 50533-0150
PO BOX 151, EAGLE GROVE, IA 50533-0151
PO BOX 152, EAGLE GROVE, IA 50533-0152
PO BOX 153, EAGLE GROVE, IA 50533-0153
PO BOX 154, EAGLE GROVE, IA 50533-0154
PO BOX 155, EAGLE GROVE, IA 50533-0155
PO BOX 156, EAGLE GROVE, IA 50533-0156
PO BOX 157, EAGLE GROVE, IA 50533-0157
PO BOX 158, EAGLE GROVE, IA 50533-0158
PO BOX 159, EAGLE GROVE, IA 50533-0159
PO BOX 160, EAGLE GROVE, IA 50533-0160
PO BOX 161, EAGLE GROVE, IA 50533-0161
PO BOX 162, EAGLE GROVE, IA 50533-0162
PO BOX 163, EAGLE GROVE, IA 50533-0163
PO BOX 164, EAGLE GROVE, IA 50533-0164
PO BOX 165, EAGLE GROVE, IA 50533-0165
PO BOX 166, EAGLE GROVE, IA 50533-0166
PO BOX 167, EAGLE GROVE, IA 50533-0167
PO BOX 168, EAGLE GROVE, IA 50533-0168
PO BOX 169, EAGLE GROVE, IA 50533-0169
PO BOX 170, EAGLE GROVE, IA 50533-0170
PO BOX 171, EAGLE GROVE, IA 50533-0171
PO BOX 172, EAGLE GROVE, IA 50533-0172
PO BOX 173, EAGLE GROVE, IA 50533-0173
PO BOX 174, EAGLE GROVE, IA 50533-0174
PO BOX 175, EAGLE GROVE, IA 50533-0175
PO BOX 176, EAGLE GROVE, IA 50533-0176
PO BOX 177, EAGLE GROVE, IA 50533-0177
PO BOX 178, EAGLE GROVE, IA 50533-0178
PO BOX 179, EAGLE GROVE, IA 50533-0179
PO BOX 180, EAGLE GROVE, IA 50533-0180
PO BOX 181, EAGLE GROVE, IA 50533-0181
PO BOX 182, EAGLE GROVE, IA 50533-0182
PO BOX 183, EAGLE GROVE, IA 50533-0183
PO BOX 184, EAGLE GROVE, IA 50533-0184
PO BOX 185, EAGLE GROVE, IA 50533-0185
PO BOX 186, EAGLE GROVE, IA 50533-0186
PO BOX 187, EAGLE GROVE, IA 50533-0187
PO BOX 188, EAGLE GROVE, IA 50533-0188
PO BOX 189, EAGLE GROVE, IA 50533-0189
PO BOX 190, EAGLE GROVE, IA 50533-0190
PO BOX 191, EAGLE GROVE, IA 50533-0191
PO BOX 192, EAGLE GROVE, IA 50533-0192
PO BOX 193, EAGLE GROVE, IA 50533-0193
PO BOX 194, EAGLE GROVE, IA 50533-0194
PO BOX 195, EAGLE GROVE, IA 50533-0195
PO BOX 196, EAGLE GROVE, IA 50533-0196
PO BOX 197, EAGLE GROVE, IA 50533-0197
PO BOX 198, EAGLE GROVE, IA 50533-0198
PO BOX 199, EAGLE GROVE, IA 50533-0199
PO BOX 200, EAGLE GROVE, IA 50533-0200
PO BOX 201, EAGLE GROVE, IA 50533-0201
PO BOX 202, EAGLE GROVE, IA 50533-0202
PO BOX 203, EAGLE GROVE, IA 50533-0203
PO BOX 204, EAGLE GROVE, IA 50533-0204
PO BOX 205, EAGLE GROVE, IA 50533-0205
PO BOX 206, EAGLE GROVE, IA 50533-0206
PO BOX 207, EAGLE GROVE, IA 50533-0207
PO BOX 208, EAGLE GROVE, IA 50533-0208
PO BOX 209, EAGLE GROVE, IA 50533-0209
PO BOX 210, EAGLE GROVE, IA 50533-0210
PO BOX 211, EAGLE GROVE, IA 50533-0211
PO BOX 212, EAGLE GROVE, IA 50533-0212
PO BOX 213, EAGLE GROVE, IA 50533-0213
PO BOX 214, EAGLE GROVE, IA 50533-0214
PO BOX 215, EAGLE GROVE, IA 50533-0215
PO BOX 216, EAGLE GROVE, IA 50533-0216
PO BOX 217, EAGLE GROVE, IA 50533-0217
PO BOX 218, EAGLE GROVE, IA 50533-0218
PO BOX 219, EAGLE GROVE, IA 50533-0219
PO BOX 220, EAGLE GROVE, IA 50533-0220
PO BOX 221, EAGLE GROVE, IA 50533-0221
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