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, ELGIN, IA 52141-0001
PO BOX 2, ELGIN, IA 52141-0002
PO BOX 3, ELGIN, IA 52141-0003
PO BOX 4, ELGIN, IA 52141-0004
PO BOX 5, ELGIN, IA 52141-0005
PO BOX 6, ELGIN, IA 52141-0006
PO BOX 7, ELGIN, IA 52141-0007
PO BOX 8, ELGIN, IA 52141-0008
PO BOX 9, ELGIN, IA 52141-0009
PO BOX 10, ELGIN, IA 52141-0010
PO BOX 11, ELGIN, IA 52141-0011
PO BOX 12, ELGIN, IA 52141-0012
PO BOX 13, ELGIN, IA 52141-0013
PO BOX 14, ELGIN, IA 52141-0014
PO BOX 15, ELGIN, IA 52141-0015
PO BOX 16, ELGIN, IA 52141-0016
PO BOX 17, ELGIN, IA 52141-0017
PO BOX 18, ELGIN, IA 52141-0018
PO BOX 19, ELGIN, IA 52141-0019
PO BOX 20, ELGIN, IA 52141-0020
PO BOX 21, ELGIN, IA 52141-0021
PO BOX 22, ELGIN, IA 52141-0022
PO BOX 23, ELGIN, IA 52141-0023
PO BOX 24, ELGIN, IA 52141-0024
PO BOX 25, ELGIN, IA 52141-0025
PO BOX 26, ELGIN, IA 52141-0026
PO BOX 27, ELGIN, IA 52141-0027
PO BOX 28, ELGIN, IA 52141-0028
PO BOX 29, ELGIN, IA 52141-0029
PO BOX 30, ELGIN, IA 52141-0030
PO BOX 31, ELGIN, IA 52141-0031
PO BOX 32, ELGIN, IA 52141-0032
PO BOX 33, ELGIN, IA 52141-0033
PO BOX 34, ELGIN, IA 52141-0034
PO BOX 35, ELGIN, IA 52141-0035
PO BOX 36, ELGIN, IA 52141-0036
PO BOX 37, ELGIN, IA 52141-0037
PO BOX 38, ELGIN, IA 52141-0038
PO BOX 39, ELGIN, IA 52141-0039
PO BOX 40, ELGIN, IA 52141-0040
PO BOX 41, ELGIN, IA 52141-0041
PO BOX 42, ELGIN, IA 52141-0042
PO BOX 43, ELGIN, IA 52141-0043
PO BOX 44, ELGIN, IA 52141-0044
PO BOX 45, ELGIN, IA 52141-0045
PO BOX 46, ELGIN, IA 52141-0046
PO BOX 47, ELGIN, IA 52141-0047
PO BOX 48, ELGIN, IA 52141-0048
PO BOX 49, ELGIN, IA 52141-0049
PO BOX 50, ELGIN, IA 52141-0050
PO BOX 51, ELGIN, IA 52141-0051
PO BOX 52, ELGIN, IA 52141-0052
PO BOX 53, ELGIN, IA 52141-0053
PO BOX 54, ELGIN, IA 52141-0054
PO BOX 55, ELGIN, IA 52141-0055
PO BOX 56, ELGIN, IA 52141-0056
PO BOX 57, ELGIN, IA 52141-0057
PO BOX 58, ELGIN, IA 52141-0058
PO BOX 59, ELGIN, IA 52141-0059
PO BOX 60, ELGIN, IA 52141-0060
PO BOX 61, ELGIN, IA 52141-0061
PO BOX 62, ELGIN, IA 52141-0062
PO BOX 63, ELGIN, IA 52141-0063
PO BOX 64, ELGIN, IA 52141-0064
PO BOX 65, ELGIN, IA 52141-0065
PO BOX 66, ELGIN, IA 52141-0066
PO BOX 67, ELGIN, IA 52141-0067
PO BOX 68, ELGIN, IA 52141-0068
PO BOX 69, ELGIN, IA 52141-0069
PO BOX 70, ELGIN, IA 52141-0070
PO BOX 71, ELGIN, IA 52141-0071
PO BOX 72, ELGIN, IA 52141-0072
PO BOX 73, ELGIN, IA 52141-0073
PO BOX 74, ELGIN, IA 52141-0074
PO BOX 75, ELGIN, IA 52141-0075
PO BOX 76, ELGIN, IA 52141-0076
PO BOX 77, ELGIN, IA 52141-0077
PO BOX 78, ELGIN, IA 52141-0078
PO BOX 79, ELGIN, IA 52141-0079
PO BOX 80, ELGIN, IA 52141-0080
PO BOX 81, ELGIN, IA 52141-0081
PO BOX 82, ELGIN, IA 52141-0082
PO BOX 83, ELGIN, IA 52141-0083
PO BOX 84, ELGIN, IA 52141-0084
PO BOX 85, ELGIN, IA 52141-0085
PO BOX 86, ELGIN, IA 52141-0086
PO BOX 87, ELGIN, IA 52141-0087
PO BOX 88, ELGIN, IA 52141-0088
PO BOX 89, ELGIN, IA 52141-0089
PO BOX 90, ELGIN, IA 52141-0090
PO BOX 91, ELGIN, IA 52141-0091
PO BOX 92, ELGIN, IA 52141-0092
PO BOX 93, ELGIN, IA 52141-0093
PO BOX 94, ELGIN, IA 52141-0094
PO BOX 95, ELGIN, IA 52141-0095
PO BOX 96, ELGIN, IA 52141-0096
PO BOX 97, ELGIN, IA 52141-0097
PO BOX 98, ELGIN, IA 52141-0098
PO BOX 99, ELGIN, IA 52141-0099
PO BOX 100, ELGIN, IA 52141-0100
PO BOX 101, ELGIN, IA 52141-0101
PO BOX 102, ELGIN, IA 52141-0102
PO BOX 103, ELGIN, IA 52141-0103
PO BOX 104, ELGIN, IA 52141-0104
PO BOX 105, ELGIN, IA 52141-0105
PO BOX 106, ELGIN, IA 52141-0106
PO BOX 107, ELGIN, IA 52141-0107
PO BOX 108, ELGIN, IA 52141-0108
PO BOX 109, ELGIN, IA 52141-0109
PO BOX 110, ELGIN, IA 52141-0110
PO BOX 111, ELGIN, IA 52141-0111
PO BOX 112, ELGIN, IA 52141-0112
PO BOX 113, ELGIN, IA 52141-0113
PO BOX 114, ELGIN, IA 52141-0114
PO BOX 115, ELGIN, IA 52141-0115
PO BOX 116, ELGIN, IA 52141-0116
PO BOX 117, ELGIN, IA 52141-0117
PO BOX 118, ELGIN, IA 52141-0118
PO BOX 119, ELGIN, IA 52141-0119
PO BOX 120, ELGIN, IA 52141-0120
PO BOX 121, ELGIN, IA 52141-0121
PO BOX 122, ELGIN, IA 52141-0122
PO BOX 123, ELGIN, IA 52141-0123
PO BOX 124, ELGIN, IA 52141-0124
PO BOX 125, ELGIN, IA 52141-0125
PO BOX 126, ELGIN, IA 52141-0126
PO BOX 127, ELGIN, IA 52141-0127
PO BOX 128, ELGIN, IA 52141-0128
PO BOX 129, ELGIN, IA 52141-0129
PO BOX 130, ELGIN, IA 52141-0130
PO BOX 131, ELGIN, IA 52141-0131
PO BOX 132, ELGIN, IA 52141-0132
PO BOX 133, ELGIN, IA 52141-0133
PO BOX 134, ELGIN, IA 52141-0134
PO BOX 135, ELGIN, IA 52141-0135
PO BOX 136, ELGIN, IA 52141-0136
PO BOX 137, ELGIN, IA 52141-0137
PO BOX 138, ELGIN, IA 52141-0138
PO BOX 139, ELGIN, IA 52141-0139
PO BOX 140, ELGIN, IA 52141-0140
PO BOX 141, ELGIN, IA 52141-0141
PO BOX 142, ELGIN, IA 52141-0142
PO BOX 143, ELGIN, IA 52141-0143
PO BOX 144, ELGIN, IA 52141-0144
PO BOX 145, ELGIN, IA 52141-0145
PO BOX 146, ELGIN, IA 52141-0146
PO BOX 147, ELGIN, IA 52141-0147
PO BOX 148, ELGIN, IA 52141-0148
PO BOX 149, ELGIN, IA 52141-0149
PO BOX 150, ELGIN, IA 52141-0150
PO BOX 151, ELGIN, IA 52141-0151
PO BOX 152, ELGIN, IA 52141-0152
PO BOX 153, ELGIN, IA 52141-0153
PO BOX 154, ELGIN, IA 52141-0154
PO BOX 155, ELGIN, IA 52141-0155
PO BOX 156, ELGIN, IA 52141-0156
PO BOX 157, ELGIN, IA 52141-0157
PO BOX 158, ELGIN, IA 52141-0158
PO BOX 159, ELGIN, IA 52141-0159
PO BOX 160, ELGIN, IA 52141-0160
PO BOX 161, ELGIN, IA 52141-0161
PO BOX 162, ELGIN, IA 52141-0162
PO BOX 163, ELGIN, IA 52141-0163
PO BOX 164, ELGIN, IA 52141-0164
PO BOX 165, ELGIN, IA 52141-0165
PO BOX 166, ELGIN, IA 52141-0166
PO BOX 167, ELGIN, IA 52141-0167
PO BOX 168, ELGIN, IA 52141-0168
PO BOX 169, ELGIN, IA 52141-0169
PO BOX 170, ELGIN, IA 52141-0170
PO BOX 171, ELGIN, IA 52141-0171
PO BOX 172, ELGIN, IA 52141-0172
PO BOX 173, ELGIN, IA 52141-0173
PO BOX 174, ELGIN, IA 52141-0174
PO BOX 175, ELGIN, IA 52141-0175
PO BOX 176, ELGIN, IA 52141-0176
PO BOX 177, ELGIN, IA 52141-0177
PO BOX 178, ELGIN, IA 52141-0178
PO BOX 179, ELGIN, IA 52141-0179
PO BOX 180, ELGIN, IA 52141-0180
PO BOX 181, ELGIN, IA 52141-0181
PO BOX 182, ELGIN, IA 52141-0182
PO BOX 183, ELGIN, IA 52141-0183
PO BOX 184, ELGIN, IA 52141-0184
PO BOX 185, ELGIN, IA 52141-0185
PO BOX 186, ELGIN, IA 52141-0186
PO BOX 187, ELGIN, IA 52141-0187
PO BOX 188, ELGIN, IA 52141-0188
PO BOX 189, ELGIN, IA 52141-0189
PO BOX 190, ELGIN, IA 52141-0190
PO BOX 191, ELGIN, IA 52141-0191
PO BOX 192, ELGIN, IA 52141-0192
PO BOX 193, ELGIN, IA 52141-0193
PO BOX 194, ELGIN, IA 52141-0194
PO BOX 195, ELGIN, IA 52141-0195
PO BOX 196, ELGIN, IA 52141-0196
PO BOX 197, ELGIN, IA 52141-0197
PO BOX 198, ELGIN, IA 52141-0198
PO BOX 199, ELGIN, IA 52141-0199
PO BOX 200, ELGIN, IA 52141-0200
PO BOX 201, ELGIN, IA 52141-0201
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