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, DALLAS CENTER, IA 50063-0001
PO BOX 2, DALLAS CENTER, IA 50063-0002
PO BOX 3, DALLAS CENTER, IA 50063-0003
PO BOX 4, DALLAS CENTER, IA 50063-0004
PO BOX 5, DALLAS CENTER, IA 50063-0005
PO BOX 6, DALLAS CENTER, IA 50063-0006
PO BOX 7, DALLAS CENTER, IA 50063-0007
PO BOX 8, DALLAS CENTER, IA 50063-0008
PO BOX 9, DALLAS CENTER, IA 50063-0009
PO BOX 10, DALLAS CENTER, IA 50063-0010
PO BOX 11, DALLAS CENTER, IA 50063-0011
PO BOX 12, DALLAS CENTER, IA 50063-0012
PO BOX 13, DALLAS CENTER, IA 50063-0013
PO BOX 14, DALLAS CENTER, IA 50063-0014
PO BOX 15, DALLAS CENTER, IA 50063-0015
PO BOX 16, DALLAS CENTER, IA 50063-0016
PO BOX 17, DALLAS CENTER, IA 50063-0017
PO BOX 18, DALLAS CENTER, IA 50063-0018
PO BOX 19, DALLAS CENTER, IA 50063-0019
PO BOX 20, DALLAS CENTER, IA 50063-0020
PO BOX 21, DALLAS CENTER, IA 50063-0021
PO BOX 22, DALLAS CENTER, IA 50063-0022
PO BOX 23, DALLAS CENTER, IA 50063-0023
PO BOX 24, DALLAS CENTER, IA 50063-0024
PO BOX 25, DALLAS CENTER, IA 50063-0025
PO BOX 26, DALLAS CENTER, IA 50063-0026
PO BOX 27, DALLAS CENTER, IA 50063-0027
PO BOX 28, DALLAS CENTER, IA 50063-0028
PO BOX 29, DALLAS CENTER, IA 50063-0029
PO BOX 30, DALLAS CENTER, IA 50063-0030
PO BOX 31, DALLAS CENTER, IA 50063-0031
PO BOX 32, DALLAS CENTER, IA 50063-0032
PO BOX 33, DALLAS CENTER, IA 50063-0033
PO BOX 34, DALLAS CENTER, IA 50063-0034
PO BOX 35, DALLAS CENTER, IA 50063-0035
PO BOX 36, DALLAS CENTER, IA 50063-0036
PO BOX 37, DALLAS CENTER, IA 50063-0037
PO BOX 38, DALLAS CENTER, IA 50063-0038
PO BOX 39, DALLAS CENTER, IA 50063-0039
PO BOX 40, DALLAS CENTER, IA 50063-0040
PO BOX 41, DALLAS CENTER, IA 50063-0041
PO BOX 42, DALLAS CENTER, IA 50063-0042
PO BOX 43, DALLAS CENTER, IA 50063-0043
PO BOX 44, DALLAS CENTER, IA 50063-0044
PO BOX 45, DALLAS CENTER, IA 50063-0045
PO BOX 46, DALLAS CENTER, IA 50063-0046
PO BOX 47, DALLAS CENTER, IA 50063-0047
PO BOX 48, DALLAS CENTER, IA 50063-0048
PO BOX 49, DALLAS CENTER, IA 50063-0049
PO BOX 50, DALLAS CENTER, IA 50063-0050
PO BOX 51, DALLAS CENTER, IA 50063-0051
PO BOX 52, DALLAS CENTER, IA 50063-0052
PO BOX 53, DALLAS CENTER, IA 50063-0053
PO BOX 54, DALLAS CENTER, IA 50063-0054
PO BOX 55, DALLAS CENTER, IA 50063-0055
PO BOX 56, DALLAS CENTER, IA 50063-0056
PO BOX 57, DALLAS CENTER, IA 50063-0057
PO BOX 58, DALLAS CENTER, IA 50063-0058
PO BOX 59, DALLAS CENTER, IA 50063-0059
PO BOX 60, DALLAS CENTER, IA 50063-0060
PO BOX 61, DALLAS CENTER, IA 50063-0061
PO BOX 62, DALLAS CENTER, IA 50063-0062
PO BOX 63, DALLAS CENTER, IA 50063-0063
PO BOX 64, DALLAS CENTER, IA 50063-0064
PO BOX 65, DALLAS CENTER, IA 50063-0065
PO BOX 66, DALLAS CENTER, IA 50063-0066
PO BOX 67, DALLAS CENTER, IA 50063-0067
PO BOX 68, DALLAS CENTER, IA 50063-0068
PO BOX 69, DALLAS CENTER, IA 50063-0069
PO BOX 70, DALLAS CENTER, IA 50063-0070
PO BOX 71, DALLAS CENTER, IA 50063-0071
PO BOX 72, DALLAS CENTER, IA 50063-0072
PO BOX 73, DALLAS CENTER, IA 50063-0073
PO BOX 74, DALLAS CENTER, IA 50063-0074
PO BOX 75, DALLAS CENTER, IA 50063-0075
PO BOX 76, DALLAS CENTER, IA 50063-0076
PO BOX 77, DALLAS CENTER, IA 50063-0077
PO BOX 78, DALLAS CENTER, IA 50063-0078
PO BOX 79, DALLAS CENTER, IA 50063-0079
PO BOX 80, DALLAS CENTER, IA 50063-0080
PO BOX 81, DALLAS CENTER, IA 50063-0081
PO BOX 82, DALLAS CENTER, IA 50063-0082
PO BOX 83, DALLAS CENTER, IA 50063-0083
PO BOX 84, DALLAS CENTER, IA 50063-0084
PO BOX 85, DALLAS CENTER, IA 50063-0085
PO BOX 86, DALLAS CENTER, IA 50063-0086
PO BOX 87, DALLAS CENTER, IA 50063-0087
PO BOX 88, DALLAS CENTER, IA 50063-0088
PO BOX 89, DALLAS CENTER, IA 50063-0089
PO BOX 90, DALLAS CENTER, IA 50063-0090
PO BOX 91, DALLAS CENTER, IA 50063-0091
PO BOX 92, DALLAS CENTER, IA 50063-0092
PO BOX 93, DALLAS CENTER, IA 50063-0093
PO BOX 94, DALLAS CENTER, IA 50063-0094
PO BOX 95, DALLAS CENTER, IA 50063-0095
PO BOX 96, DALLAS CENTER, IA 50063-0096
PO BOX 97, DALLAS CENTER, IA 50063-0097
PO BOX 98, DALLAS CENTER, IA 50063-0098
PO BOX 99, DALLAS CENTER, IA 50063-0099
PO BOX 100, DALLAS CENTER, IA 50063-0100
PO BOX 101, DALLAS CENTER, IA 50063-0101
PO BOX 102, DALLAS CENTER, IA 50063-0102
PO BOX 103, DALLAS CENTER, IA 50063-0103
PO BOX 104, DALLAS CENTER, IA 50063-0104
PO BOX 105, DALLAS CENTER, IA 50063-0105
PO BOX 106, DALLAS CENTER, IA 50063-0106
PO BOX 107, DALLAS CENTER, IA 50063-0107
PO BOX 108, DALLAS CENTER, IA 50063-0108
PO BOX 109, DALLAS CENTER, IA 50063-0109
PO BOX 110, DALLAS CENTER, IA 50063-0110
PO BOX 111, DALLAS CENTER, IA 50063-0111
PO BOX 112, DALLAS CENTER, IA 50063-0112
PO BOX 113, DALLAS CENTER, IA 50063-0113
PO BOX 114, DALLAS CENTER, IA 50063-0114
PO BOX 115, DALLAS CENTER, IA 50063-0115
PO BOX 116, DALLAS CENTER, IA 50063-0116
PO BOX 117, DALLAS CENTER, IA 50063-0117
PO BOX 118, DALLAS CENTER, IA 50063-0118
PO BOX 119, DALLAS CENTER, IA 50063-0119
PO BOX 120, DALLAS CENTER, IA 50063-0120
PO BOX 121, DALLAS CENTER, IA 50063-0121
PO BOX 122, DALLAS CENTER, IA 50063-0122
PO BOX 123, DALLAS CENTER, IA 50063-0123
PO BOX 124, DALLAS CENTER, IA 50063-0124
PO BOX 125, DALLAS CENTER, IA 50063-0125
PO BOX 126, DALLAS CENTER, IA 50063-0126
PO BOX 127, DALLAS CENTER, IA 50063-0127
PO BOX 128, DALLAS CENTER, IA 50063-0128
PO BOX 129, DALLAS CENTER, IA 50063-0129
PO BOX 130, DALLAS CENTER, IA 50063-0130
PO BOX 131, DALLAS CENTER, IA 50063-0131
PO BOX 132, DALLAS CENTER, IA 50063-0132
PO BOX 133, DALLAS CENTER, IA 50063-0133
PO BOX 134, DALLAS CENTER, IA 50063-0134
PO BOX 135, DALLAS CENTER, IA 50063-0135
PO BOX 136, DALLAS CENTER, IA 50063-0136
PO BOX 137, DALLAS CENTER, IA 50063-0137
PO BOX 138, DALLAS CENTER, IA 50063-0138
PO BOX 139, DALLAS CENTER, IA 50063-0139
PO BOX 140, DALLAS CENTER, IA 50063-0140
PO BOX 141, DALLAS CENTER, IA 50063-0141
PO BOX 142, DALLAS CENTER, IA 50063-0142
PO BOX 143, DALLAS CENTER, IA 50063-0143
PO BOX 144, DALLAS CENTER, IA 50063-0144
PO BOX 145, DALLAS CENTER, IA 50063-0145
PO BOX 146, DALLAS CENTER, IA 50063-0146
PO BOX 147, DALLAS CENTER, IA 50063-0147
PO BOX 148, DALLAS CENTER, IA 50063-0148
PO BOX 149, DALLAS CENTER, IA 50063-0149
PO BOX 150, DALLAS CENTER, IA 50063-0150
PO BOX 151, DALLAS CENTER, IA 50063-0151
PO BOX 152, DALLAS CENTER, IA 50063-0152
PO BOX 153, DALLAS CENTER, IA 50063-0153
PO BOX 154, DALLAS CENTER, IA 50063-0154
PO BOX 155, DALLAS CENTER, IA 50063-0155
PO BOX 156, DALLAS CENTER, IA 50063-0156
PO BOX 157, DALLAS CENTER, IA 50063-0157
PO BOX 158, DALLAS CENTER, IA 50063-0158
PO BOX 159, DALLAS CENTER, IA 50063-0159
PO BOX 160, DALLAS CENTER, IA 50063-0160
PO BOX 161, DALLAS CENTER, IA 50063-0161
PO BOX 162, DALLAS CENTER, IA 50063-0162
PO BOX 163, DALLAS CENTER, IA 50063-0163
PO BOX 164, DALLAS CENTER, IA 50063-0164
PO BOX 165, DALLAS CENTER, IA 50063-0165
PO BOX 166, DALLAS CENTER, IA 50063-0166
PO BOX 167, DALLAS CENTER, IA 50063-0167
PO BOX 168, DALLAS CENTER, IA 50063-0168
PO BOX 169, DALLAS CENTER, IA 50063-0169
PO BOX 170, DALLAS CENTER, IA 50063-0170
PO BOX 171, DALLAS CENTER, IA 50063-0171
PO BOX 172, DALLAS CENTER, IA 50063-0172
PO BOX 173, DALLAS CENTER, IA 50063-0173
PO BOX 174, DALLAS CENTER, IA 50063-0174
PO BOX 175, DALLAS CENTER, IA 50063-0175
PO BOX 176, DALLAS CENTER, IA 50063-0176
PO BOX 177, DALLAS CENTER, IA 50063-0177
PO BOX 178, DALLAS CENTER, IA 50063-0178
PO BOX 179, DALLAS CENTER, IA 50063-0179
PO BOX 180, DALLAS CENTER, IA 50063-0180
PO BOX 181, DALLAS CENTER, IA 50063-0181
PO BOX 182, DALLAS CENTER, IA 50063-0182
PO BOX 183, DALLAS CENTER, IA 50063-0183
PO BOX 184, DALLAS CENTER, IA 50063-0184
PO BOX 185, DALLAS CENTER, IA 50063-0185
PO BOX 186, DALLAS CENTER, IA 50063-0186
PO BOX 187, DALLAS CENTER, IA 50063-0187
PO BOX 188, DALLAS CENTER, IA 50063-0188
PO BOX 189, DALLAS CENTER, IA 50063-0189
PO BOX 190, DALLAS CENTER, IA 50063-0190
PO BOX 191, DALLAS CENTER, IA 50063-0191
PO BOX 192, DALLAS CENTER, IA 50063-0192
PO BOX 193, DALLAS CENTER, IA 50063-0193
PO BOX 194, DALLAS CENTER, IA 50063-0194
PO BOX 195, DALLAS CENTER, IA 50063-0195
PO BOX 196, DALLAS CENTER, IA 50063-0196
PO BOX 197, DALLAS CENTER, IA 50063-0197
PO BOX 198, DALLAS CENTER, IA 50063-0198
PO BOX 199, DALLAS CENTER, IA 50063-0199
PO BOX 200, DALLAS CENTER, IA 50063-0200
PO BOX 201, DALLAS CENTER, IA 50063-0201
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