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, MIDDLETOWN, IA 52638-0001
PO BOX 2, MIDDLETOWN, IA 52638-0002
PO BOX 3, MIDDLETOWN, IA 52638-0003
PO BOX 4, MIDDLETOWN, IA 52638-0004
PO BOX 5, MIDDLETOWN, IA 52638-0005
PO BOX 6, MIDDLETOWN, IA 52638-0006
PO BOX 7, MIDDLETOWN, IA 52638-0007
PO BOX 8, MIDDLETOWN, IA 52638-0008
PO BOX 9, MIDDLETOWN, IA 52638-0009
PO BOX 10, MIDDLETOWN, IA 52638-0010
PO BOX 11, MIDDLETOWN, IA 52638-0011
PO BOX 12, MIDDLETOWN, IA 52638-0012
PO BOX 13, MIDDLETOWN, IA 52638-0013
PO BOX 14, MIDDLETOWN, IA 52638-0014
PO BOX 15, MIDDLETOWN, IA 52638-0015
PO BOX 16, MIDDLETOWN, IA 52638-0016
PO BOX 17, MIDDLETOWN, IA 52638-0017
PO BOX 18, MIDDLETOWN, IA 52638-0018
PO BOX 19, MIDDLETOWN, IA 52638-0019
PO BOX 20, MIDDLETOWN, IA 52638-0020
PO BOX 21, MIDDLETOWN, IA 52638-0021
PO BOX 22, MIDDLETOWN, IA 52638-0022
PO BOX 23, MIDDLETOWN, IA 52638-0023
PO BOX 24, MIDDLETOWN, IA 52638-0024
PO BOX 25, MIDDLETOWN, IA 52638-0025
PO BOX 26, MIDDLETOWN, IA 52638-0026
PO BOX 27, MIDDLETOWN, IA 52638-0027
PO BOX 28, MIDDLETOWN, IA 52638-0028
PO BOX 29, MIDDLETOWN, IA 52638-0029
PO BOX 30, MIDDLETOWN, IA 52638-0030
PO BOX 31, MIDDLETOWN, IA 52638-0031
PO BOX 32, MIDDLETOWN, IA 52638-0032
PO BOX 33, MIDDLETOWN, IA 52638-0033
PO BOX 34, MIDDLETOWN, IA 52638-0034
PO BOX 35, MIDDLETOWN, IA 52638-0035
PO BOX 36, MIDDLETOWN, IA 52638-0036
PO BOX 37, MIDDLETOWN, IA 52638-0037
PO BOX 38, MIDDLETOWN, IA 52638-0038
PO BOX 39, MIDDLETOWN, IA 52638-0039
PO BOX 40, MIDDLETOWN, IA 52638-0040
PO BOX 41, MIDDLETOWN, IA 52638-0041
PO BOX 42, MIDDLETOWN, IA 52638-0042
PO BOX 43, MIDDLETOWN, IA 52638-0043
PO BOX 44, MIDDLETOWN, IA 52638-0044
PO BOX 45, MIDDLETOWN, IA 52638-0045
PO BOX 46, MIDDLETOWN, IA 52638-0046
PO BOX 47, MIDDLETOWN, IA 52638-0047
PO BOX 48, MIDDLETOWN, IA 52638-0048
PO BOX 49, MIDDLETOWN, IA 52638-0049
PO BOX 50, MIDDLETOWN, IA 52638-0050
PO BOX 51, MIDDLETOWN, IA 52638-0051
PO BOX 52, MIDDLETOWN, IA 52638-0052
PO BOX 53, MIDDLETOWN, IA 52638-0053
PO BOX 54, MIDDLETOWN, IA 52638-0054
PO BOX 55, MIDDLETOWN, IA 52638-0055
PO BOX 56, MIDDLETOWN, IA 52638-0056
PO BOX 57, MIDDLETOWN, IA 52638-0057
PO BOX 58, MIDDLETOWN, IA 52638-0058
PO BOX 59, MIDDLETOWN, IA 52638-0059
PO BOX 60, MIDDLETOWN, IA 52638-0060
PO BOX 61, MIDDLETOWN, IA 52638-0061
PO BOX 62, MIDDLETOWN, IA 52638-0062
PO BOX 63, MIDDLETOWN, IA 52638-0063
PO BOX 64, MIDDLETOWN, IA 52638-0064
PO BOX 65, MIDDLETOWN, IA 52638-0065
PO BOX 66, MIDDLETOWN, IA 52638-0066
PO BOX 67, MIDDLETOWN, IA 52638-0067
PO BOX 68, MIDDLETOWN, IA 52638-0068
PO BOX 69, MIDDLETOWN, IA 52638-0069
PO BOX 70, MIDDLETOWN, IA 52638-0070
PO BOX 71, MIDDLETOWN, IA 52638-0071
PO BOX 72, MIDDLETOWN, IA 52638-0072
PO BOX 73, MIDDLETOWN, IA 52638-0073
PO BOX 74, MIDDLETOWN, IA 52638-0074
PO BOX 75, MIDDLETOWN, IA 52638-0075
PO BOX 76, MIDDLETOWN, IA 52638-0076
PO BOX 77, MIDDLETOWN, IA 52638-0077
PO BOX 78, MIDDLETOWN, IA 52638-0078
PO BOX 79, MIDDLETOWN, IA 52638-0079
PO BOX 80, MIDDLETOWN, IA 52638-0080
PO BOX 81, MIDDLETOWN, IA 52638-0081
PO BOX 82, MIDDLETOWN, IA 52638-0082
PO BOX 83, MIDDLETOWN, IA 52638-0083
PO BOX 84, MIDDLETOWN, IA 52638-0084
PO BOX 85, MIDDLETOWN, IA 52638-0085
PO BOX 86, MIDDLETOWN, IA 52638-0086
PO BOX 87, MIDDLETOWN, IA 52638-0087
PO BOX 88, MIDDLETOWN, IA 52638-0088
PO BOX 89, MIDDLETOWN, IA 52638-0089
PO BOX 90, MIDDLETOWN, IA 52638-0090
PO BOX 91, MIDDLETOWN, IA 52638-0091
PO BOX 92, MIDDLETOWN, IA 52638-0092
PO BOX 93, MIDDLETOWN, IA 52638-0093
PO BOX 94, MIDDLETOWN, IA 52638-0094
PO BOX 95, MIDDLETOWN, IA 52638-0095
PO BOX 96, MIDDLETOWN, IA 52638-0096
PO BOX 97, MIDDLETOWN, IA 52638-0097
PO BOX 98, MIDDLETOWN, IA 52638-0098
PO BOX 99, MIDDLETOWN, IA 52638-0099
PO BOX 100, MIDDLETOWN, IA 52638-0100
PO BOX 101, MIDDLETOWN, IA 52638-0101
PO BOX 102, MIDDLETOWN, IA 52638-0102
PO BOX 103, MIDDLETOWN, IA 52638-0103
PO BOX 104, MIDDLETOWN, IA 52638-0104
PO BOX 105, MIDDLETOWN, IA 52638-0105
PO BOX 106, MIDDLETOWN, IA 52638-0106
PO BOX 107, MIDDLETOWN, IA 52638-0107
PO BOX 108, MIDDLETOWN, IA 52638-0108
PO BOX 109, MIDDLETOWN, IA 52638-0109
PO BOX 110, MIDDLETOWN, IA 52638-0110
PO BOX 111, MIDDLETOWN, IA 52638-0111
PO BOX 112, MIDDLETOWN, IA 52638-0112
PO BOX 113, MIDDLETOWN, IA 52638-0113
PO BOX 114, MIDDLETOWN, IA 52638-0114
PO BOX 115, MIDDLETOWN, IA 52638-0115
PO BOX 116, MIDDLETOWN, IA 52638-0116
PO BOX 117, MIDDLETOWN, IA 52638-0117
PO BOX 118, MIDDLETOWN, IA 52638-0118
PO BOX 119, MIDDLETOWN, IA 52638-0119
PO BOX 120, MIDDLETOWN, IA 52638-0120
PO BOX 121, MIDDLETOWN, IA 52638-0121
PO BOX 122, MIDDLETOWN, IA 52638-0122
PO BOX 123, MIDDLETOWN, IA 52638-0123
PO BOX 124, MIDDLETOWN, IA 52638-0124
PO BOX 125, MIDDLETOWN, IA 52638-0125
PO BOX 126, MIDDLETOWN, IA 52638-0126
PO BOX 127, MIDDLETOWN, IA 52638-0127
PO BOX 128, MIDDLETOWN, IA 52638-0128
PO BOX 129, MIDDLETOWN, IA 52638-0129
PO BOX 130, MIDDLETOWN, IA 52638-0130
PO BOX 131, MIDDLETOWN, IA 52638-0131
PO BOX 132, MIDDLETOWN, IA 52638-0132
PO BOX 133, MIDDLETOWN, IA 52638-0133
PO BOX 134, MIDDLETOWN, IA 52638-0134
PO BOX 135, MIDDLETOWN, IA 52638-0135
PO BOX 136, MIDDLETOWN, IA 52638-0136
PO BOX 137, MIDDLETOWN, IA 52638-0137
PO BOX 138, MIDDLETOWN, IA 52638-0138
PO BOX 139, MIDDLETOWN, IA 52638-0139
PO BOX 140, MIDDLETOWN, IA 52638-0140
PO BOX 141, MIDDLETOWN, IA 52638-0141
PO BOX 142, MIDDLETOWN, IA 52638-0142
PO BOX 143, MIDDLETOWN, IA 52638-0143
PO BOX 144, MIDDLETOWN, IA 52638-0144
PO BOX 145, MIDDLETOWN, IA 52638-0145
PO BOX 146, MIDDLETOWN, IA 52638-0146
PO BOX 147, MIDDLETOWN, IA 52638-0147
PO BOX 148, MIDDLETOWN, IA 52638-0148
PO BOX 149, MIDDLETOWN, IA 52638-0149
PO BOX 150, MIDDLETOWN, IA 52638-0150
PO BOX 151, MIDDLETOWN, IA 52638-0151
PO BOX 152, MIDDLETOWN, IA 52638-0152
PO BOX 153, MIDDLETOWN, IA 52638-0153
PO BOX 154, MIDDLETOWN, IA 52638-0154
PO BOX 155, MIDDLETOWN, IA 52638-0155
PO BOX 156, MIDDLETOWN, IA 52638-0156
PO BOX 157, MIDDLETOWN, IA 52638-0157
PO BOX 158, MIDDLETOWN, IA 52638-0158
PO BOX 159, MIDDLETOWN, IA 52638-0159
PO BOX 160, MIDDLETOWN, IA 52638-0160
PO BOX 161, MIDDLETOWN, IA 52638-0161
PO BOX 162, MIDDLETOWN, IA 52638-0162
PO BOX 163, MIDDLETOWN, IA 52638-0163
PO BOX 164, MIDDLETOWN, IA 52638-0164
PO BOX 165, MIDDLETOWN, IA 52638-0165
PO BOX 166, MIDDLETOWN, IA 52638-0166
PO BOX 167, MIDDLETOWN, IA 52638-0167
PO BOX 168, MIDDLETOWN, IA 52638-0168
PO BOX 169, MIDDLETOWN, IA 52638-0169
PO BOX 170, MIDDLETOWN, IA 52638-0170
PO BOX 171, MIDDLETOWN, IA 52638-0171
PO BOX 172, MIDDLETOWN, IA 52638-0172
PO BOX 173, MIDDLETOWN, IA 52638-0173
PO BOX 174, MIDDLETOWN, IA 52638-0174
PO BOX 175, MIDDLETOWN, IA 52638-0175
PO BOX 176, MIDDLETOWN, IA 52638-0176
PO BOX 177, MIDDLETOWN, IA 52638-0177
PO BOX 178, MIDDLETOWN, IA 52638-0178
PO BOX 179, MIDDLETOWN, IA 52638-0179
PO BOX 180, MIDDLETOWN, IA 52638-0180
PO BOX 181, MIDDLETOWN, IA 52638-0181
PO BOX 182, MIDDLETOWN, IA 52638-0182
PO BOX 183, MIDDLETOWN, IA 52638-0183
PO BOX 184, MIDDLETOWN, IA 52638-0184
PO BOX 185, MIDDLETOWN, IA 52638-0185
PO BOX 186, MIDDLETOWN, IA 52638-0186
PO BOX 187, MIDDLETOWN, IA 52638-0187
PO BOX 188, MIDDLETOWN, IA 52638-0188
PO BOX 189, MIDDLETOWN, IA 52638-0189
PO BOX 190, MIDDLETOWN, IA 52638-0190
PO BOX 191, MIDDLETOWN, IA 52638-0191
PO BOX 192, MIDDLETOWN, IA 52638-0192
PO BOX 193, MIDDLETOWN, IA 52638-0193
PO BOX 194, MIDDLETOWN, IA 52638-0194
PO BOX 195, MIDDLETOWN, IA 52638-0195
PO BOX 196, MIDDLETOWN, IA 52638-0196
PO BOX 197, MIDDLETOWN, IA 52638-0197
PO BOX 198, MIDDLETOWN, IA 52638-0198
PO BOX 199, MIDDLETOWN, IA 52638-0199
PO BOX 200, MIDDLETOWN, IA 52638-0200
PO BOX 201, MIDDLETOWN, IA 52638-0201
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