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, WORTHINGTON, IA 52078-0001
PO BOX 2, WORTHINGTON, IA 52078-0002
PO BOX 3, WORTHINGTON, IA 52078-0003
PO BOX 4, WORTHINGTON, IA 52078-0004
PO BOX 5, WORTHINGTON, IA 52078-0005
PO BOX 6, WORTHINGTON, IA 52078-0006
PO BOX 7, WORTHINGTON, IA 52078-0007
PO BOX 8, WORTHINGTON, IA 52078-0008
PO BOX 9, WORTHINGTON, IA 52078-0009
PO BOX 10, WORTHINGTON, IA 52078-0010
PO BOX 11, WORTHINGTON, IA 52078-0011
PO BOX 12, WORTHINGTON, IA 52078-0012
PO BOX 13, WORTHINGTON, IA 52078-0013
PO BOX 14, WORTHINGTON, IA 52078-0014
PO BOX 15, WORTHINGTON, IA 52078-0015
PO BOX 16, WORTHINGTON, IA 52078-0016
PO BOX 17, WORTHINGTON, IA 52078-0017
PO BOX 18, WORTHINGTON, IA 52078-0018
PO BOX 19, WORTHINGTON, IA 52078-0019
PO BOX 20, WORTHINGTON, IA 52078-0020
PO BOX 21, WORTHINGTON, IA 52078-0021
PO BOX 22, WORTHINGTON, IA 52078-0022
PO BOX 23, WORTHINGTON, IA 52078-0023
PO BOX 24, WORTHINGTON, IA 52078-0024
PO BOX 25, WORTHINGTON, IA 52078-0025
PO BOX 26, WORTHINGTON, IA 52078-0026
PO BOX 27, WORTHINGTON, IA 52078-0027
PO BOX 28, WORTHINGTON, IA 52078-0028
PO BOX 29, WORTHINGTON, IA 52078-0029
PO BOX 30, WORTHINGTON, IA 52078-0030
PO BOX 31, WORTHINGTON, IA 52078-0031
PO BOX 32, WORTHINGTON, IA 52078-0032
PO BOX 33, WORTHINGTON, IA 52078-0033
PO BOX 34, WORTHINGTON, IA 52078-0034
PO BOX 35, WORTHINGTON, IA 52078-0035
PO BOX 36, WORTHINGTON, IA 52078-0036
PO BOX 37, WORTHINGTON, IA 52078-0037
PO BOX 38, WORTHINGTON, IA 52078-0038
PO BOX 39, WORTHINGTON, IA 52078-0039
PO BOX 40, WORTHINGTON, IA 52078-0040
PO BOX 41, WORTHINGTON, IA 52078-0041
PO BOX 42, WORTHINGTON, IA 52078-0042
PO BOX 43, WORTHINGTON, IA 52078-0043
PO BOX 44, WORTHINGTON, IA 52078-0044
PO BOX 45, WORTHINGTON, IA 52078-0045
PO BOX 46, WORTHINGTON, IA 52078-0046
PO BOX 47, WORTHINGTON, IA 52078-0047
PO BOX 48, WORTHINGTON, IA 52078-0048
PO BOX 49, WORTHINGTON, IA 52078-0049
PO BOX 50, WORTHINGTON, IA 52078-0050
PO BOX 51, WORTHINGTON, IA 52078-0051
PO BOX 52, WORTHINGTON, IA 52078-0052
PO BOX 53, WORTHINGTON, IA 52078-0053
PO BOX 54, WORTHINGTON, IA 52078-0054
PO BOX 55, WORTHINGTON, IA 52078-0055
PO BOX 56, WORTHINGTON, IA 52078-0056
PO BOX 57, WORTHINGTON, IA 52078-0057
PO BOX 58, WORTHINGTON, IA 52078-0058
PO BOX 59, WORTHINGTON, IA 52078-0059
PO BOX 60, WORTHINGTON, IA 52078-0060
PO BOX 61, WORTHINGTON, IA 52078-0061
PO BOX 62, WORTHINGTON, IA 52078-0062
PO BOX 63, WORTHINGTON, IA 52078-0063
PO BOX 64, WORTHINGTON, IA 52078-0064
PO BOX 65, WORTHINGTON, IA 52078-0065
PO BOX 66, WORTHINGTON, IA 52078-0066
PO BOX 67, WORTHINGTON, IA 52078-0067
PO BOX 68, WORTHINGTON, IA 52078-0068
PO BOX 69, WORTHINGTON, IA 52078-0069
PO BOX 70, WORTHINGTON, IA 52078-0070
PO BOX 71, WORTHINGTON, IA 52078-0071
PO BOX 72, WORTHINGTON, IA 52078-0072
PO BOX 73, WORTHINGTON, IA 52078-0073
PO BOX 74, WORTHINGTON, IA 52078-0074
PO BOX 75, WORTHINGTON, IA 52078-0075
PO BOX 76, WORTHINGTON, IA 52078-0076
PO BOX 77, WORTHINGTON, IA 52078-0077
PO BOX 78, WORTHINGTON, IA 52078-0078
PO BOX 79, WORTHINGTON, IA 52078-0079
PO BOX 80, WORTHINGTON, IA 52078-0080
PO BOX 81, WORTHINGTON, IA 52078-0081
PO BOX 82, WORTHINGTON, IA 52078-0082
PO BOX 83, WORTHINGTON, IA 52078-0083
PO BOX 84, WORTHINGTON, IA 52078-0084
PO BOX 85, WORTHINGTON, IA 52078-0085
PO BOX 86, WORTHINGTON, IA 52078-0086
PO BOX 87, WORTHINGTON, IA 52078-0087
PO BOX 88, WORTHINGTON, IA 52078-0088
PO BOX 89, WORTHINGTON, IA 52078-0089
PO BOX 90, WORTHINGTON, IA 52078-0090
PO BOX 91, WORTHINGTON, IA 52078-0091
PO BOX 92, WORTHINGTON, IA 52078-0092
PO BOX 93, WORTHINGTON, IA 52078-0093
PO BOX 94, WORTHINGTON, IA 52078-0094
PO BOX 95, WORTHINGTON, IA 52078-0095
PO BOX 96, WORTHINGTON, IA 52078-0096
PO BOX 97, WORTHINGTON, IA 52078-0097
PO BOX 98, WORTHINGTON, IA 52078-0098
PO BOX 99, WORTHINGTON, IA 52078-0099
PO BOX 100, WORTHINGTON, IA 52078-0100
PO BOX 101, WORTHINGTON, IA 52078-0101
PO BOX 102, WORTHINGTON, IA 52078-0102
PO BOX 103, WORTHINGTON, IA 52078-0103
PO BOX 104, WORTHINGTON, IA 52078-0104
PO BOX 105, WORTHINGTON, IA 52078-0105
PO BOX 106, WORTHINGTON, IA 52078-0106
PO BOX 107, WORTHINGTON, IA 52078-0107
PO BOX 108, WORTHINGTON, IA 52078-0108
PO BOX 109, WORTHINGTON, IA 52078-0109
PO BOX 110, WORTHINGTON, IA 52078-0110
PO BOX 111, WORTHINGTON, IA 52078-0111
PO BOX 112, WORTHINGTON, IA 52078-0112
PO BOX 113, WORTHINGTON, IA 52078-0113
PO BOX 114, WORTHINGTON, IA 52078-0114
PO BOX 115, WORTHINGTON, IA 52078-0115
PO BOX 116, WORTHINGTON, IA 52078-0116
PO BOX 117, WORTHINGTON, IA 52078-0117
PO BOX 118, WORTHINGTON, IA 52078-0118
PO BOX 119, WORTHINGTON, IA 52078-0119
PO BOX 120, WORTHINGTON, IA 52078-0120
PO BOX 121, WORTHINGTON, IA 52078-0121
PO BOX 122, WORTHINGTON, IA 52078-0122
PO BOX 123, WORTHINGTON, IA 52078-0123
PO BOX 124, WORTHINGTON, IA 52078-0124
PO BOX 125, WORTHINGTON, IA 52078-0125
PO BOX 126, WORTHINGTON, IA 52078-0126
PO BOX 127, WORTHINGTON, IA 52078-0127
PO BOX 128, WORTHINGTON, IA 52078-0128
PO BOX 129, WORTHINGTON, IA 52078-0129
PO BOX 130, WORTHINGTON, IA 52078-0130
PO BOX 131, WORTHINGTON, IA 52078-0131
PO BOX 132, WORTHINGTON, IA 52078-0132
PO BOX 133, WORTHINGTON, IA 52078-0133
PO BOX 134, WORTHINGTON, IA 52078-0134
PO BOX 135, WORTHINGTON, IA 52078-0135
PO BOX 136, WORTHINGTON, IA 52078-0136
PO BOX 137, WORTHINGTON, IA 52078-0137
PO BOX 138, WORTHINGTON, IA 52078-0138
PO BOX 139, WORTHINGTON, IA 52078-0139
PO BOX 140, WORTHINGTON, IA 52078-0140
PO BOX 141, WORTHINGTON, IA 52078-0141
PO BOX 142, WORTHINGTON, IA 52078-0142
PO BOX 143, WORTHINGTON, IA 52078-0143
PO BOX 144, WORTHINGTON, IA 52078-0144
PO BOX 145, WORTHINGTON, IA 52078-0145
PO BOX 146, WORTHINGTON, IA 52078-0146
PO BOX 147, WORTHINGTON, IA 52078-0147
PO BOX 148, WORTHINGTON, IA 52078-0148
PO BOX 149, WORTHINGTON, IA 52078-0149
PO BOX 150, WORTHINGTON, IA 52078-0150
PO BOX 151, WORTHINGTON, IA 52078-0151
PO BOX 152, WORTHINGTON, IA 52078-0152
PO BOX 153, WORTHINGTON, IA 52078-0153
PO BOX 154, WORTHINGTON, IA 52078-0154
PO BOX 155, WORTHINGTON, IA 52078-0155
PO BOX 156, WORTHINGTON, IA 52078-0156
PO BOX 157, WORTHINGTON, IA 52078-0157
PO BOX 158, WORTHINGTON, IA 52078-0158
PO BOX 159, WORTHINGTON, IA 52078-0159
PO BOX 160, WORTHINGTON, IA 52078-0160
PO BOX 161, WORTHINGTON, IA 52078-0161
PO BOX 162, WORTHINGTON, IA 52078-0162
PO BOX 163, WORTHINGTON, IA 52078-0163
PO BOX 164, WORTHINGTON, IA 52078-0164
PO BOX 165, WORTHINGTON, IA 52078-0165
PO BOX 166, WORTHINGTON, IA 52078-0166
PO BOX 167, WORTHINGTON, IA 52078-0167
PO BOX 168, WORTHINGTON, IA 52078-0168
PO BOX 169, WORTHINGTON, IA 52078-0169
PO BOX 170, WORTHINGTON, IA 52078-0170
PO BOX 171, WORTHINGTON, IA 52078-0171
PO BOX 172, WORTHINGTON, IA 52078-0172
PO BOX 173, WORTHINGTON, IA 52078-0173
PO BOX 174, WORTHINGTON, IA 52078-0174
PO BOX 175, WORTHINGTON, IA 52078-0175
PO BOX 176, WORTHINGTON, IA 52078-0176
PO BOX 177, WORTHINGTON, IA 52078-0177
PO BOX 178, WORTHINGTON, IA 52078-0178
PO BOX 179, WORTHINGTON, IA 52078-0179
PO BOX 180, WORTHINGTON, IA 52078-0180
PO BOX 181, WORTHINGTON, IA 52078-0181
PO BOX 182, WORTHINGTON, IA 52078-0182
PO BOX 183, WORTHINGTON, IA 52078-0183
PO BOX 184, WORTHINGTON, IA 52078-0184
PO BOX 185, WORTHINGTON, IA 52078-0185
PO BOX 186, WORTHINGTON, IA 52078-0186
PO BOX 187, WORTHINGTON, IA 52078-0187
PO BOX 188, WORTHINGTON, IA 52078-0188
PO BOX 189, WORTHINGTON, IA 52078-0189
PO BOX 190, WORTHINGTON, IA 52078-0190
PO BOX 191, WORTHINGTON, IA 52078-0191
PO BOX 192, WORTHINGTON, IA 52078-0192
PO BOX 193, WORTHINGTON, IA 52078-0193
PO BOX 194, WORTHINGTON, IA 52078-0194
PO BOX 195, WORTHINGTON, IA 52078-0195
PO BOX 196, WORTHINGTON, IA 52078-0196
PO BOX 197, WORTHINGTON, IA 52078-0197
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