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, SHEFFIELD, IA 50475-0001
PO BOX 2, SHEFFIELD, IA 50475-0002
PO BOX 3, SHEFFIELD, IA 50475-0003
PO BOX 4, SHEFFIELD, IA 50475-0004
PO BOX 5, SHEFFIELD, IA 50475-0005
PO BOX 6, SHEFFIELD, IA 50475-0006
PO BOX 7, SHEFFIELD, IA 50475-0007
PO BOX 8, SHEFFIELD, IA 50475-0008
PO BOX 9, SHEFFIELD, IA 50475-0009
PO BOX 10, SHEFFIELD, IA 50475-0010
PO BOX 11, SHEFFIELD, IA 50475-0011
PO BOX 12, SHEFFIELD, IA 50475-0012
PO BOX 13, SHEFFIELD, IA 50475-0013
PO BOX 14, SHEFFIELD, IA 50475-0014
PO BOX 15, SHEFFIELD, IA 50475-0015
PO BOX 16, SHEFFIELD, IA 50475-0016
PO BOX 17, SHEFFIELD, IA 50475-0017
PO BOX 18, SHEFFIELD, IA 50475-0018
PO BOX 19, SHEFFIELD, IA 50475-0019
PO BOX 20, SHEFFIELD, IA 50475-0020
PO BOX 21, SHEFFIELD, IA 50475-0021
PO BOX 22, SHEFFIELD, IA 50475-0022
PO BOX 23, SHEFFIELD, IA 50475-0023
PO BOX 24, SHEFFIELD, IA 50475-0024
PO BOX 25, SHEFFIELD, IA 50475-0025
PO BOX 26, SHEFFIELD, IA 50475-0026
PO BOX 27, SHEFFIELD, IA 50475-0027
PO BOX 28, SHEFFIELD, IA 50475-0028
PO BOX 29, SHEFFIELD, IA 50475-0029
PO BOX 30, SHEFFIELD, IA 50475-0030
PO BOX 31, SHEFFIELD, IA 50475-0031
PO BOX 32, SHEFFIELD, IA 50475-0032
PO BOX 33, SHEFFIELD, IA 50475-0033
PO BOX 34, SHEFFIELD, IA 50475-0034
PO BOX 35, SHEFFIELD, IA 50475-0035
PO BOX 36, SHEFFIELD, IA 50475-0036
PO BOX 37, SHEFFIELD, IA 50475-0037
PO BOX 38, SHEFFIELD, IA 50475-0038
PO BOX 39, SHEFFIELD, IA 50475-0039
PO BOX 40, SHEFFIELD, IA 50475-0040
PO BOX 41, SHEFFIELD, IA 50475-0041
PO BOX 42, SHEFFIELD, IA 50475-0042
PO BOX 43, SHEFFIELD, IA 50475-0043
PO BOX 44, SHEFFIELD, IA 50475-0044
PO BOX 45, SHEFFIELD, IA 50475-0045
PO BOX 46, SHEFFIELD, IA 50475-0046
PO BOX 47, SHEFFIELD, IA 50475-0047
PO BOX 48, SHEFFIELD, IA 50475-0048
PO BOX 49, SHEFFIELD, IA 50475-0049
PO BOX 50, SHEFFIELD, IA 50475-0050
PO BOX 51, SHEFFIELD, IA 50475-0051
PO BOX 52, SHEFFIELD, IA 50475-0052
PO BOX 53, SHEFFIELD, IA 50475-0053
PO BOX 54, SHEFFIELD, IA 50475-0054
PO BOX 55, SHEFFIELD, IA 50475-0055
PO BOX 56, SHEFFIELD, IA 50475-0056
PO BOX 57, SHEFFIELD, IA 50475-0057
PO BOX 58, SHEFFIELD, IA 50475-0058
PO BOX 59, SHEFFIELD, IA 50475-0059
PO BOX 60, SHEFFIELD, IA 50475-0060
PO BOX 61, SHEFFIELD, IA 50475-0061
PO BOX 62, SHEFFIELD, IA 50475-0062
PO BOX 63, SHEFFIELD, IA 50475-0063
PO BOX 64, SHEFFIELD, IA 50475-0064
PO BOX 65, SHEFFIELD, IA 50475-0065
PO BOX 66, SHEFFIELD, IA 50475-0066
PO BOX 67, SHEFFIELD, IA 50475-0067
PO BOX 68, SHEFFIELD, IA 50475-0068
PO BOX 69, SHEFFIELD, IA 50475-0069
PO BOX 70, SHEFFIELD, IA 50475-0070
PO BOX 71, SHEFFIELD, IA 50475-0071
PO BOX 72, SHEFFIELD, IA 50475-0072
PO BOX 73, SHEFFIELD, IA 50475-0073
PO BOX 74, SHEFFIELD, IA 50475-0074
PO BOX 75, SHEFFIELD, IA 50475-0075
PO BOX 76, SHEFFIELD, IA 50475-0076
PO BOX 77, SHEFFIELD, IA 50475-0077
PO BOX 78, SHEFFIELD, IA 50475-0078
PO BOX 79, SHEFFIELD, IA 50475-0079
PO BOX 80, SHEFFIELD, IA 50475-0080
PO BOX 81, SHEFFIELD, IA 50475-0081
PO BOX 82, SHEFFIELD, IA 50475-0082
PO BOX 83, SHEFFIELD, IA 50475-0083
PO BOX 84, SHEFFIELD, IA 50475-0084
PO BOX 85, SHEFFIELD, IA 50475-0085
PO BOX 86, SHEFFIELD, IA 50475-0086
PO BOX 87, SHEFFIELD, IA 50475-0087
PO BOX 88, SHEFFIELD, IA 50475-0088
PO BOX 89, SHEFFIELD, IA 50475-0089
PO BOX 90, SHEFFIELD, IA 50475-0090
PO BOX 91, SHEFFIELD, IA 50475-0091
PO BOX 92, SHEFFIELD, IA 50475-0092
PO BOX 93, SHEFFIELD, IA 50475-0093
PO BOX 94, SHEFFIELD, IA 50475-0094
PO BOX 95, SHEFFIELD, IA 50475-0095
PO BOX 96, SHEFFIELD, IA 50475-0096
PO BOX 97, SHEFFIELD, IA 50475-0097
PO BOX 98, SHEFFIELD, IA 50475-0098
PO BOX 99, SHEFFIELD, IA 50475-0099
PO BOX 100, SHEFFIELD, IA 50475-0100
PO BOX 101, SHEFFIELD, IA 50475-0101
PO BOX 102, SHEFFIELD, IA 50475-0102
PO BOX 103, SHEFFIELD, IA 50475-0103
PO BOX 104, SHEFFIELD, IA 50475-0104
PO BOX 105, SHEFFIELD, IA 50475-0105
PO BOX 106, SHEFFIELD, IA 50475-0106
PO BOX 107, SHEFFIELD, IA 50475-0107
PO BOX 108, SHEFFIELD, IA 50475-0108
PO BOX 109, SHEFFIELD, IA 50475-0109
PO BOX 110, SHEFFIELD, IA 50475-0110
PO BOX 111, SHEFFIELD, IA 50475-0111
PO BOX 112, SHEFFIELD, IA 50475-0112
PO BOX 113, SHEFFIELD, IA 50475-0113
PO BOX 114, SHEFFIELD, IA 50475-0114
PO BOX 115, SHEFFIELD, IA 50475-0115
PO BOX 116, SHEFFIELD, IA 50475-0116
PO BOX 117, SHEFFIELD, IA 50475-0117
PO BOX 118, SHEFFIELD, IA 50475-0118
PO BOX 119, SHEFFIELD, IA 50475-0119
PO BOX 120, SHEFFIELD, IA 50475-0120
PO BOX 121, SHEFFIELD, IA 50475-0121
PO BOX 122, SHEFFIELD, IA 50475-0122
PO BOX 123, SHEFFIELD, IA 50475-0123
PO BOX 124, SHEFFIELD, IA 50475-0124
PO BOX 125, SHEFFIELD, IA 50475-0125
PO BOX 126, SHEFFIELD, IA 50475-0126
PO BOX 127, SHEFFIELD, IA 50475-0127
PO BOX 128, SHEFFIELD, IA 50475-0128
PO BOX 129, SHEFFIELD, IA 50475-0129
PO BOX 130, SHEFFIELD, IA 50475-0130
PO BOX 131, SHEFFIELD, IA 50475-0131
PO BOX 132, SHEFFIELD, IA 50475-0132
PO BOX 133, SHEFFIELD, IA 50475-0133
PO BOX 134, SHEFFIELD, IA 50475-0134
PO BOX 135, SHEFFIELD, IA 50475-0135
PO BOX 136, SHEFFIELD, IA 50475-0136
PO BOX 137, SHEFFIELD, IA 50475-0137
PO BOX 138, SHEFFIELD, IA 50475-0138
PO BOX 139, SHEFFIELD, IA 50475-0139
PO BOX 140, SHEFFIELD, IA 50475-0140
PO BOX 141, SHEFFIELD, IA 50475-0141
PO BOX 142, SHEFFIELD, IA 50475-0142
PO BOX 143, SHEFFIELD, IA 50475-0143
PO BOX 144, SHEFFIELD, IA 50475-0144
PO BOX 145, SHEFFIELD, IA 50475-0145
PO BOX 146, SHEFFIELD, IA 50475-0146
PO BOX 147, SHEFFIELD, IA 50475-0147
PO BOX 148, SHEFFIELD, IA 50475-0148
PO BOX 149, SHEFFIELD, IA 50475-0149
PO BOX 150, SHEFFIELD, IA 50475-0150
PO BOX 151, SHEFFIELD, IA 50475-0151
PO BOX 152, SHEFFIELD, IA 50475-0152
PO BOX 153, SHEFFIELD, IA 50475-0153
PO BOX 154, SHEFFIELD, IA 50475-0154
PO BOX 155, SHEFFIELD, IA 50475-0155
PO BOX 156, SHEFFIELD, IA 50475-0156
PO BOX 157, SHEFFIELD, IA 50475-0157
PO BOX 158, SHEFFIELD, IA 50475-0158
PO BOX 159, SHEFFIELD, IA 50475-0159
PO BOX 160, SHEFFIELD, IA 50475-0160
PO BOX 161, SHEFFIELD, IA 50475-0161
PO BOX 162, SHEFFIELD, IA 50475-0162
PO BOX 163, SHEFFIELD, IA 50475-0163
PO BOX 164, SHEFFIELD, IA 50475-0164
PO BOX 165, SHEFFIELD, IA 50475-0165
PO BOX 166, SHEFFIELD, IA 50475-0166
PO BOX 167, SHEFFIELD, IA 50475-0167
PO BOX 168, SHEFFIELD, IA 50475-0168
PO BOX 169, SHEFFIELD, IA 50475-0169
PO BOX 170, SHEFFIELD, IA 50475-0170
PO BOX 171, SHEFFIELD, IA 50475-0171
PO BOX 172, SHEFFIELD, IA 50475-0172
PO BOX 173, SHEFFIELD, IA 50475-0173
PO BOX 174, SHEFFIELD, IA 50475-0174
PO BOX 175, SHEFFIELD, IA 50475-0175
PO BOX 176, SHEFFIELD, IA 50475-0176
PO BOX 177, SHEFFIELD, IA 50475-0177
PO BOX 178, SHEFFIELD, IA 50475-0178
PO BOX 179, SHEFFIELD, IA 50475-0179
PO BOX 180, SHEFFIELD, IA 50475-0180
PO BOX 181, SHEFFIELD, IA 50475-0181
PO BOX 182, SHEFFIELD, IA 50475-0182
PO BOX 183, SHEFFIELD, IA 50475-0183
PO BOX 184, SHEFFIELD, IA 50475-0184
PO BOX 185, SHEFFIELD, IA 50475-0185
PO BOX 186, SHEFFIELD, IA 50475-0186
PO BOX 187, SHEFFIELD, IA 50475-0187
PO BOX 188, SHEFFIELD, IA 50475-0188
PO BOX 189, SHEFFIELD, IA 50475-0189
PO BOX 190, SHEFFIELD, IA 50475-0190
PO BOX 191, SHEFFIELD, IA 50475-0191
PO BOX 192, SHEFFIELD, IA 50475-0192
PO BOX 193, SHEFFIELD, IA 50475-0193
PO BOX 194, SHEFFIELD, IA 50475-0194
PO BOX 195, SHEFFIELD, IA 50475-0195
PO BOX 196, SHEFFIELD, IA 50475-0196
PO BOX 197, SHEFFIELD, IA 50475-0197
PO BOX 198, SHEFFIELD, IA 50475-0198
PO BOX 199, SHEFFIELD, IA 50475-0199
PO BOX 200, SHEFFIELD, IA 50475-0200
PO BOX 201, SHEFFIELD, IA 50475-0201
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