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, GRINNELL, KS 67738-0001
PO BOX 2, GRINNELL, KS 67738-0002
PO BOX 3, GRINNELL, KS 67738-0003
PO BOX 4, GRINNELL, KS 67738-0004
PO BOX 5, GRINNELL, KS 67738-0005
PO BOX 6, GRINNELL, KS 67738-0006
PO BOX 7, GRINNELL, KS 67738-0007
PO BOX 8, GRINNELL, KS 67738-0008
PO BOX 9, GRINNELL, KS 67738-0009
PO BOX 10, GRINNELL, KS 67738-0010
PO BOX 11, GRINNELL, KS 67738-0011
PO BOX 12, GRINNELL, KS 67738-0012
PO BOX 13, GRINNELL, KS 67738-0013
PO BOX 14, GRINNELL, KS 67738-0014
PO BOX 15, GRINNELL, KS 67738-0015
PO BOX 16, GRINNELL, KS 67738-0016
PO BOX 17, GRINNELL, KS 67738-0017
PO BOX 18, GRINNELL, KS 67738-0018
PO BOX 19, GRINNELL, KS 67738-0019
PO BOX 20, GRINNELL, KS 67738-0020
PO BOX 21, GRINNELL, KS 67738-0021
PO BOX 22, GRINNELL, KS 67738-0022
PO BOX 23, GRINNELL, KS 67738-0023
PO BOX 24, GRINNELL, KS 67738-0024
PO BOX 25, GRINNELL, KS 67738-0025
PO BOX 26, GRINNELL, KS 67738-0026
PO BOX 27, GRINNELL, KS 67738-0027
PO BOX 28, GRINNELL, KS 67738-0028
PO BOX 29, GRINNELL, KS 67738-0029
PO BOX 30, GRINNELL, KS 67738-0030
PO BOX 31, GRINNELL, KS 67738-0031
PO BOX 32, GRINNELL, KS 67738-0032
PO BOX 33, GRINNELL, KS 67738-0033
PO BOX 34, GRINNELL, KS 67738-0034
PO BOX 35, GRINNELL, KS 67738-0035
PO BOX 36, GRINNELL, KS 67738-0036
PO BOX 37, GRINNELL, KS 67738-0037
PO BOX 38, GRINNELL, KS 67738-0038
PO BOX 39, GRINNELL, KS 67738-0039
PO BOX 40, GRINNELL, KS 67738-0040
PO BOX 41, GRINNELL, KS 67738-0041
PO BOX 42, GRINNELL, KS 67738-0042
PO BOX 43, GRINNELL, KS 67738-0043
PO BOX 44, GRINNELL, KS 67738-0044
PO BOX 45, GRINNELL, KS 67738-0045
PO BOX 46, GRINNELL, KS 67738-0046
PO BOX 47, GRINNELL, KS 67738-0047
PO BOX 48, GRINNELL, KS 67738-0048
PO BOX 49, GRINNELL, KS 67738-0049
PO BOX 50, GRINNELL, KS 67738-0050
PO BOX 51, GRINNELL, KS 67738-0051
PO BOX 52, GRINNELL, KS 67738-0052
PO BOX 53, GRINNELL, KS 67738-0053
PO BOX 54, GRINNELL, KS 67738-0054
PO BOX 55, GRINNELL, KS 67738-0055
PO BOX 56, GRINNELL, KS 67738-0056
PO BOX 57, GRINNELL, KS 67738-0057
PO BOX 58, GRINNELL, KS 67738-0058
PO BOX 59, GRINNELL, KS 67738-0059
PO BOX 60, GRINNELL, KS 67738-0060
PO BOX 61, GRINNELL, KS 67738-0061
PO BOX 62, GRINNELL, KS 67738-0062
PO BOX 63, GRINNELL, KS 67738-0063
PO BOX 64, GRINNELL, KS 67738-0064
PO BOX 65, GRINNELL, KS 67738-0065
PO BOX 66, GRINNELL, KS 67738-0066
PO BOX 67, GRINNELL, KS 67738-0067
PO BOX 68, GRINNELL, KS 67738-0068
PO BOX 69, GRINNELL, KS 67738-0069
PO BOX 70, GRINNELL, KS 67738-0070
PO BOX 71, GRINNELL, KS 67738-0071
PO BOX 72, GRINNELL, KS 67738-0072
PO BOX 73, GRINNELL, KS 67738-0073
PO BOX 74, GRINNELL, KS 67738-0074
PO BOX 75, GRINNELL, KS 67738-0075
PO BOX 76, GRINNELL, KS 67738-0076
PO BOX 77, GRINNELL, KS 67738-0077
PO BOX 78, GRINNELL, KS 67738-0078
PO BOX 79, GRINNELL, KS 67738-0079
PO BOX 80, GRINNELL, KS 67738-0080
PO BOX 81, GRINNELL, KS 67738-0081
PO BOX 82, GRINNELL, KS 67738-0082
PO BOX 83, GRINNELL, KS 67738-0083
PO BOX 84, GRINNELL, KS 67738-0084
PO BOX 85, GRINNELL, KS 67738-0085
PO BOX 86, GRINNELL, KS 67738-0086
PO BOX 87, GRINNELL, KS 67738-0087
PO BOX 88, GRINNELL, KS 67738-0088
PO BOX 89, GRINNELL, KS 67738-0089
PO BOX 90, GRINNELL, KS 67738-0090
PO BOX 91, GRINNELL, KS 67738-0091
PO BOX 92, GRINNELL, KS 67738-0092
PO BOX 93, GRINNELL, KS 67738-0093
PO BOX 94, GRINNELL, KS 67738-0094
PO BOX 95, GRINNELL, KS 67738-0095
PO BOX 96, GRINNELL, KS 67738-0096
PO BOX 97, GRINNELL, KS 67738-0097
PO BOX 98, GRINNELL, KS 67738-0098
PO BOX 99, GRINNELL, KS 67738-0099
PO BOX 100, GRINNELL, KS 67738-0100
PO BOX 101, GRINNELL, KS 67738-0101
PO BOX 102, GRINNELL, KS 67738-0102
PO BOX 103, GRINNELL, KS 67738-0103
PO BOX 104, GRINNELL, KS 67738-0104
PO BOX 105, GRINNELL, KS 67738-0105
PO BOX 106, GRINNELL, KS 67738-0106
PO BOX 107, GRINNELL, KS 67738-0107
PO BOX 108, GRINNELL, KS 67738-0108
PO BOX 109, GRINNELL, KS 67738-0109
PO BOX 110, GRINNELL, KS 67738-0110
PO BOX 111, GRINNELL, KS 67738-0111
PO BOX 112, GRINNELL, KS 67738-0112
PO BOX 113, GRINNELL, KS 67738-0113
PO BOX 114, GRINNELL, KS 67738-0114
PO BOX 115, GRINNELL, KS 67738-0115
PO BOX 116, GRINNELL, KS 67738-0116
PO BOX 117, GRINNELL, KS 67738-0117
PO BOX 118, GRINNELL, KS 67738-0118
PO BOX 119, GRINNELL, KS 67738-0119
PO BOX 120, GRINNELL, KS 67738-0120
PO BOX 121, GRINNELL, KS 67738-0121
PO BOX 122, GRINNELL, KS 67738-0122
PO BOX 123, GRINNELL, KS 67738-0123
PO BOX 124, GRINNELL, KS 67738-0124
PO BOX 125, GRINNELL, KS 67738-0125
PO BOX 126, GRINNELL, KS 67738-0126
PO BOX 127, GRINNELL, KS 67738-0127
PO BOX 128, GRINNELL, KS 67738-0128
PO BOX 129, GRINNELL, KS 67738-0129
PO BOX 130, GRINNELL, KS 67738-0130
PO BOX 131, GRINNELL, KS 67738-0131
PO BOX 132, GRINNELL, KS 67738-0132
PO BOX 133, GRINNELL, KS 67738-0133
PO BOX 134, GRINNELL, KS 67738-0134
PO BOX 135, GRINNELL, KS 67738-0135
PO BOX 136, GRINNELL, KS 67738-0136
PO BOX 137, GRINNELL, KS 67738-0137
PO BOX 138, GRINNELL, KS 67738-0138
PO BOX 139, GRINNELL, KS 67738-0139
PO BOX 140, GRINNELL, KS 67738-0140
PO BOX 141, GRINNELL, KS 67738-0141
PO BOX 142, GRINNELL, KS 67738-0142
PO BOX 143, GRINNELL, KS 67738-0143
PO BOX 144, GRINNELL, KS 67738-0144
PO BOX 145, GRINNELL, KS 67738-0145
PO BOX 146, GRINNELL, KS 67738-0146
PO BOX 147, GRINNELL, KS 67738-0147
PO BOX 148, GRINNELL, KS 67738-0148
PO BOX 149, GRINNELL, KS 67738-0149
PO BOX 150, GRINNELL, KS 67738-0150
PO BOX 151, GRINNELL, KS 67738-0151
PO BOX 152, GRINNELL, KS 67738-0152
PO BOX 153, GRINNELL, KS 67738-0153
PO BOX 154, GRINNELL, KS 67738-0154
PO BOX 155, GRINNELL, KS 67738-0155
PO BOX 156, GRINNELL, KS 67738-0156
PO BOX 157, GRINNELL, KS 67738-0157
PO BOX 158, GRINNELL, KS 67738-0158
PO BOX 159, GRINNELL, KS 67738-0159
PO BOX 160, GRINNELL, KS 67738-0160
PO BOX 161, GRINNELL, KS 67738-0161
PO BOX 162, GRINNELL, KS 67738-0162
PO BOX 163, GRINNELL, KS 67738-0163
PO BOX 164, GRINNELL, KS 67738-0164
PO BOX 165, GRINNELL, KS 67738-0165
PO BOX 166, GRINNELL, KS 67738-0166
PO BOX 167, GRINNELL, KS 67738-0167
PO BOX 168, GRINNELL, KS 67738-0168
PO BOX 169, GRINNELL, KS 67738-0169
PO BOX 170, GRINNELL, KS 67738-0170
PO BOX 171, GRINNELL, KS 67738-0171
PO BOX 172, GRINNELL, KS 67738-0172
PO BOX 173, GRINNELL, KS 67738-0173
PO BOX 174, GRINNELL, KS 67738-0174
PO BOX 175, GRINNELL, KS 67738-0175
PO BOX 176, GRINNELL, KS 67738-0176
PO BOX 177, GRINNELL, KS 67738-0177
PO BOX 178, GRINNELL, KS 67738-0178
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