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 11, PRINCETON, IA 52768-0011
PO BOX 12, PRINCETON, IA 52768-0012
PO BOX 13, PRINCETON, IA 52768-0013
PO BOX 14, PRINCETON, IA 52768-0014
PO BOX 15, PRINCETON, IA 52768-0015
PO BOX 16, PRINCETON, IA 52768-0016
PO BOX 17, PRINCETON, IA 52768-0017
PO BOX 18, PRINCETON, IA 52768-0018
PO BOX 19, PRINCETON, IA 52768-0019
PO BOX 20, PRINCETON, IA 52768-0020
PO BOX 21, PRINCETON, IA 52768-0021
PO BOX 22, PRINCETON, IA 52768-0022
PO BOX 23, PRINCETON, IA 52768-0023
PO BOX 24, PRINCETON, IA 52768-0024
PO BOX 25, PRINCETON, IA 52768-0025
PO BOX 26, PRINCETON, IA 52768-0026
PO BOX 27, PRINCETON, IA 52768-0027
PO BOX 28, PRINCETON, IA 52768-0028
PO BOX 29, PRINCETON, IA 52768-0029
PO BOX 30, PRINCETON, IA 52768-0030
PO BOX 31, PRINCETON, IA 52768-0031
PO BOX 32, PRINCETON, IA 52768-0032
PO BOX 33, PRINCETON, IA 52768-0033
PO BOX 34, PRINCETON, IA 52768-0034
PO BOX 35, PRINCETON, IA 52768-0035
PO BOX 36, PRINCETON, IA 52768-0036
PO BOX 37, PRINCETON, IA 52768-0037
PO BOX 38, PRINCETON, IA 52768-0038
PO BOX 39, PRINCETON, IA 52768-0039
PO BOX 40, PRINCETON, IA 52768-0040
PO BOX 41, PRINCETON, IA 52768-0041
PO BOX 42, PRINCETON, IA 52768-0042
PO BOX 43, PRINCETON, IA 52768-0043
PO BOX 44, PRINCETON, IA 52768-0044
PO BOX 45, PRINCETON, IA 52768-0045
PO BOX 46, PRINCETON, IA 52768-0046
PO BOX 47, PRINCETON, IA 52768-0047
PO BOX 48, PRINCETON, IA 52768-0048
PO BOX 49, PRINCETON, IA 52768-0049
PO BOX 50, PRINCETON, IA 52768-0050
PO BOX 51, PRINCETON, IA 52768-0051
PO BOX 52, PRINCETON, IA 52768-0052
PO BOX 53, PRINCETON, IA 52768-0053
PO BOX 54, PRINCETON, IA 52768-0054
PO BOX 55, PRINCETON, IA 52768-0055
PO BOX 56, PRINCETON, IA 52768-0056
PO BOX 57, PRINCETON, IA 52768-0057
PO BOX 58, PRINCETON, IA 52768-0058
PO BOX 59, PRINCETON, IA 52768-0059
PO BOX 60, PRINCETON, IA 52768-0060
PO BOX 61, PRINCETON, IA 52768-0061
PO BOX 62, PRINCETON, IA 52768-0062
PO BOX 63, PRINCETON, IA 52768-0063
PO BOX 64, PRINCETON, IA 52768-0064
PO BOX 65, PRINCETON, IA 52768-0065
PO BOX 66, PRINCETON, IA 52768-0066
PO BOX 67, PRINCETON, IA 52768-0067
PO BOX 68, PRINCETON, IA 52768-0068
PO BOX 69, PRINCETON, IA 52768-0069
PO BOX 70, PRINCETON, IA 52768-0070
PO BOX 71, PRINCETON, IA 52768-0071
PO BOX 72, PRINCETON, IA 52768-0072
PO BOX 73, PRINCETON, IA 52768-0073
PO BOX 74, PRINCETON, IA 52768-0074
PO BOX 75, PRINCETON, IA 52768-0075
PO BOX 76, PRINCETON, IA 52768-0076
PO BOX 77, PRINCETON, IA 52768-0077
PO BOX 78, PRINCETON, IA 52768-0078
PO BOX 79, PRINCETON, IA 52768-0079
PO BOX 80, PRINCETON, IA 52768-0080
PO BOX 81, PRINCETON, IA 52768-0081
PO BOX 82, PRINCETON, IA 52768-0082
PO BOX 83, PRINCETON, IA 52768-0083
PO BOX 84, PRINCETON, IA 52768-0084
PO BOX 85, PRINCETON, IA 52768-0085
PO BOX 86, PRINCETON, IA 52768-0086
PO BOX 87, PRINCETON, IA 52768-0087
PO BOX 88, PRINCETON, IA 52768-0088
PO BOX 89, PRINCETON, IA 52768-0089
PO BOX 90, PRINCETON, IA 52768-0090
PO BOX 91, PRINCETON, IA 52768-0091
PO BOX 92, PRINCETON, IA 52768-0092
PO BOX 93, PRINCETON, IA 52768-0093
PO BOX 94, PRINCETON, IA 52768-0094
PO BOX 95, PRINCETON, IA 52768-0095
PO BOX 96, PRINCETON, IA 52768-0096
PO BOX 97, PRINCETON, IA 52768-0097
PO BOX 98, PRINCETON, IA 52768-0098
PO BOX 99, PRINCETON, IA 52768-0099
PO BOX 100, PRINCETON, IA 52768-0100
PO BOX 101, PRINCETON, IA 52768-0101
PO BOX 102, PRINCETON, IA 52768-0102
PO BOX 103, PRINCETON, IA 52768-0103
PO BOX 104, PRINCETON, IA 52768-0104
PO BOX 105, PRINCETON, IA 52768-0105
PO BOX 106, PRINCETON, IA 52768-0106
PO BOX 107, PRINCETON, IA 52768-0107
PO BOX 108, PRINCETON, IA 52768-0108
PO BOX 109, PRINCETON, IA 52768-0109
PO BOX 110, PRINCETON, IA 52768-0110
PO BOX 111, PRINCETON, IA 52768-0111
PO BOX 112, PRINCETON, IA 52768-0112
PO BOX 113, PRINCETON, IA 52768-0113
PO BOX 114, PRINCETON, IA 52768-0114
PO BOX 115, PRINCETON, IA 52768-0115
PO BOX 116, PRINCETON, IA 52768-0116
PO BOX 117, PRINCETON, IA 52768-0117
PO BOX 118, PRINCETON, IA 52768-0118
PO BOX 119, PRINCETON, IA 52768-0119
PO BOX 120, PRINCETON, IA 52768-0120
PO BOX 121, PRINCETON, IA 52768-0121
PO BOX 122, PRINCETON, IA 52768-0122
PO BOX 123, PRINCETON, IA 52768-0123
PO BOX 124, PRINCETON, IA 52768-0124
PO BOX 125, PRINCETON, IA 52768-0125
PO BOX 126, PRINCETON, IA 52768-0126
PO BOX 127, PRINCETON, IA 52768-0127
PO BOX 128, PRINCETON, IA 52768-0128
PO BOX 129, PRINCETON, IA 52768-0129
PO BOX 130, PRINCETON, IA 52768-0130
PO BOX 131, PRINCETON, IA 52768-0131
PO BOX 132, PRINCETON, IA 52768-0132
PO BOX 133, PRINCETON, IA 52768-0133
PO BOX 134, PRINCETON, IA 52768-0134
PO BOX 135, PRINCETON, IA 52768-0135
PO BOX 136, PRINCETON, IA 52768-0136
PO BOX 137, PRINCETON, IA 52768-0137
PO BOX 138, PRINCETON, IA 52768-0138
PO BOX 139, PRINCETON, IA 52768-0139
PO BOX 140, PRINCETON, IA 52768-0140
PO BOX 141, PRINCETON, IA 52768-0141
PO BOX 142, PRINCETON, IA 52768-0142
PO BOX 143, PRINCETON, IA 52768-0143
PO BOX 144, PRINCETON, IA 52768-0144
PO BOX 145, PRINCETON, IA 52768-0145
PO BOX 146, PRINCETON, IA 52768-0146
PO BOX 147, PRINCETON, IA 52768-0147
PO BOX 148, PRINCETON, IA 52768-0148
PO BOX 149, PRINCETON, IA 52768-0149
PO BOX 150, PRINCETON, IA 52768-0150
PO BOX 151, PRINCETON, IA 52768-0151
PO BOX 152, PRINCETON, IA 52768-0152
PO BOX 153, PRINCETON, IA 52768-0153
PO BOX 154, PRINCETON, IA 52768-0154
PO BOX 155, PRINCETON, IA 52768-0155
PO BOX 156, PRINCETON, IA 52768-0156
PO BOX 157, PRINCETON, IA 52768-0157
PO BOX 158, PRINCETON, IA 52768-0158
PO BOX 159, PRINCETON, IA 52768-0159
PO BOX 160, PRINCETON, IA 52768-0160
PO BOX 161, PRINCETON, IA 52768-0161
PO BOX 162, PRINCETON, IA 52768-0162
PO BOX 163, PRINCETON, IA 52768-0163
PO BOX 164, PRINCETON, IA 52768-0164
PO BOX 165, PRINCETON, IA 52768-0165
PO BOX 166, PRINCETON, IA 52768-0166
PO BOX 167, PRINCETON, IA 52768-0167
PO BOX 168, PRINCETON, IA 52768-0168
PO BOX 169, PRINCETON, IA 52768-0169
PO BOX 170, PRINCETON, IA 52768-0170
PO BOX 171, PRINCETON, IA 52768-0171
PO BOX 172, PRINCETON, IA 52768-0172
PO BOX 173, PRINCETON, IA 52768-0173
PO BOX 174, PRINCETON, IA 52768-0174
PO BOX 175, PRINCETON, IA 52768-0175
PO BOX 176, PRINCETON, IA 52768-0176
PO BOX 177, PRINCETON, IA 52768-0177
PO BOX 178, PRINCETON, IA 52768-0178
PO BOX 179, PRINCETON, IA 52768-0179
PO BOX 180, PRINCETON, IA 52768-0180
PO BOX 181, PRINCETON, IA 52768-0181
PO BOX 182, PRINCETON, IA 52768-0182
PO BOX 183, PRINCETON, IA 52768-0183
PO BOX 184, PRINCETON, IA 52768-0184
PO BOX 185, PRINCETON, IA 52768-0185
PO BOX 186, PRINCETON, IA 52768-0186
PO BOX 187, PRINCETON, IA 52768-0187
PO BOX 188, PRINCETON, IA 52768-0188
PO BOX 189, PRINCETON, IA 52768-0189
PO BOX 190, PRINCETON, IA 52768-0190
PO BOX 191, PRINCETON, IA 52768-0191
PO BOX 192, PRINCETON, IA 52768-0192
PO BOX 193, PRINCETON, IA 52768-0193
PO BOX 194, PRINCETON, IA 52768-0194
PO BOX 195, PRINCETON, IA 52768-0195
PO BOX 196, PRINCETON, IA 52768-0196
PO BOX 197, PRINCETON, IA 52768-0197
PO BOX 198, PRINCETON, IA 52768-0198
PO BOX 199, PRINCETON, IA 52768-0199
PO BOX 200, PRINCETON, IA 52768-0200
PO BOX 201, PRINCETON, IA 52768-0201
PO BOX 202, PRINCETON, IA 52768-0202
PO BOX 203, PRINCETON, IA 52768-0203
PO BOX 204, PRINCETON, IA 52768-0204
PO BOX 205, PRINCETON, IA 52768-0205
PO BOX 206, PRINCETON, IA 52768-0206
PO BOX 207, PRINCETON, IA 52768-0207
PO BOX 208, PRINCETON, IA 52768-0208
PO BOX 209, PRINCETON, IA 52768-0209
PO BOX 210, PRINCETON, IA 52768-0210
PO BOX 211, PRINCETON, IA 52768-0211
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