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, ASHLAND, WI 54806-0001
PO BOX 2, ASHLAND, WI 54806-0002
PO BOX 3, ASHLAND, WI 54806-0003
PO BOX 4, ASHLAND, WI 54806-0004
PO BOX 5, ASHLAND, WI 54806-0005
PO BOX 6, ASHLAND, WI 54806-0006
PO BOX 7, ASHLAND, WI 54806-0007
PO BOX 8, ASHLAND, WI 54806-0008
PO BOX 9, ASHLAND, WI 54806-0009
PO BOX 10, ASHLAND, WI 54806-0010
PO BOX 11, ASHLAND, WI 54806-0011
PO BOX 12, ASHLAND, WI 54806-0012
PO BOX 13, ASHLAND, WI 54806-0013
PO BOX 14, ASHLAND, WI 54806-0014
PO BOX 15, ASHLAND, WI 54806-0015
PO BOX 16, ASHLAND, WI 54806-0016
PO BOX 17, ASHLAND, WI 54806-0017
PO BOX 18, ASHLAND, WI 54806-0018
PO BOX 19, ASHLAND, WI 54806-0019
PO BOX 20, ASHLAND, WI 54806-0020
PO BOX 21, ASHLAND, WI 54806-0021
PO BOX 22, ASHLAND, WI 54806-0022
PO BOX 23, ASHLAND, WI 54806-0023
PO BOX 24, ASHLAND, WI 54806-0024
PO BOX 25, ASHLAND, WI 54806-0025
PO BOX 26, ASHLAND, WI 54806-0026
PO BOX 27, ASHLAND, WI 54806-0027
PO BOX 28, ASHLAND, WI 54806-0028
PO BOX 29, ASHLAND, WI 54806-0029
PO BOX 30, ASHLAND, WI 54806-0030
PO BOX 31, ASHLAND, WI 54806-0031
PO BOX 32, ASHLAND, WI 54806-0032
PO BOX 33, ASHLAND, WI 54806-0033
PO BOX 34, ASHLAND, WI 54806-0034
PO BOX 35, ASHLAND, WI 54806-0035
PO BOX 36, ASHLAND, WI 54806-0036
PO BOX 37, ASHLAND, WI 54806-0037
PO BOX 38, ASHLAND, WI 54806-0038
PO BOX 39, ASHLAND, WI 54806-0039
PO BOX 40, ASHLAND, WI 54806-0040
PO BOX 41, ASHLAND, WI 54806-0041
PO BOX 42, ASHLAND, WI 54806-0042
PO BOX 43, ASHLAND, WI 54806-0043
PO BOX 44, ASHLAND, WI 54806-0044
PO BOX 45, ASHLAND, WI 54806-0045
PO BOX 46, ASHLAND, WI 54806-0046
PO BOX 47, ASHLAND, WI 54806-0047
PO BOX 48, ASHLAND, WI 54806-0048
PO BOX 49, ASHLAND, WI 54806-0049
PO BOX 50, ASHLAND, WI 54806-0050
PO BOX 51, ASHLAND, WI 54806-0051
PO BOX 52, ASHLAND, WI 54806-0052
PO BOX 53, ASHLAND, WI 54806-0053
PO BOX 54, ASHLAND, WI 54806-0054
PO BOX 55, ASHLAND, WI 54806-0055
PO BOX 56, ASHLAND, WI 54806-0056
PO BOX 57, ASHLAND, WI 54806-0057
PO BOX 58, ASHLAND, WI 54806-0058
PO BOX 59, ASHLAND, WI 54806-0059
PO BOX 60, ASHLAND, WI 54806-0060
PO BOX 61, ASHLAND, WI 54806-0061
PO BOX 62, ASHLAND, WI 54806-0062
PO BOX 63, ASHLAND, WI 54806-0063
PO BOX 64, ASHLAND, WI 54806-0064
PO BOX 65, ASHLAND, WI 54806-0065
PO BOX 66, ASHLAND, WI 54806-0066
PO BOX 67, ASHLAND, WI 54806-0067
PO BOX 68, ASHLAND, WI 54806-0068
PO BOX 69, ASHLAND, WI 54806-0069
PO BOX 70, ASHLAND, WI 54806-0070
PO BOX 71, ASHLAND, WI 54806-0071
PO BOX 72, ASHLAND, WI 54806-0072
PO BOX 73, ASHLAND, WI 54806-0073
PO BOX 74, ASHLAND, WI 54806-0074
PO BOX 75, ASHLAND, WI 54806-0075
PO BOX 76, ASHLAND, WI 54806-0076
PO BOX 77, ASHLAND, WI 54806-0077
PO BOX 78, ASHLAND, WI 54806-0078
PO BOX 79, ASHLAND, WI 54806-0079
PO BOX 80, ASHLAND, WI 54806-0080
PO BOX 81, ASHLAND, WI 54806-0081
PO BOX 82, ASHLAND, WI 54806-0082
PO BOX 83, ASHLAND, WI 54806-0083
PO BOX 84, ASHLAND, WI 54806-0084
PO BOX 85, ASHLAND, WI 54806-0085
PO BOX 86, ASHLAND, WI 54806-0086
PO BOX 87, ASHLAND, WI 54806-0087
PO BOX 88, ASHLAND, WI 54806-0088
PO BOX 89, ASHLAND, WI 54806-0089
PO BOX 90, ASHLAND, WI 54806-0090
PO BOX 91, ASHLAND, WI 54806-0091
PO BOX 92, ASHLAND, WI 54806-0092
PO BOX 93, ASHLAND, WI 54806-0093
PO BOX 94, ASHLAND, WI 54806-0094
PO BOX 95, ASHLAND, WI 54806-0095
PO BOX 96, ASHLAND, WI 54806-0096
PO BOX 97, ASHLAND, WI 54806-0097
PO BOX 98, ASHLAND, WI 54806-0098
PO BOX 99, ASHLAND, WI 54806-0099
PO BOX 100, ASHLAND, WI 54806-0100
PO BOX 101, ASHLAND, WI 54806-0101
PO BOX 102, ASHLAND, WI 54806-0102
PO BOX 103, ASHLAND, WI 54806-0103
PO BOX 104, ASHLAND, WI 54806-0104
PO BOX 105, ASHLAND, WI 54806-0105
PO BOX 106, ASHLAND, WI 54806-0106
PO BOX 107, ASHLAND, WI 54806-0107
PO BOX 108, ASHLAND, WI 54806-0108
PO BOX 109, ASHLAND, WI 54806-0109
PO BOX 110, ASHLAND, WI 54806-0110
PO BOX 111, ASHLAND, WI 54806-0111
PO BOX 112, ASHLAND, WI 54806-0112
PO BOX 113, ASHLAND, WI 54806-0113
PO BOX 114, ASHLAND, WI 54806-0114
PO BOX 115, ASHLAND, WI 54806-0115
PO BOX 116, ASHLAND, WI 54806-0116
PO BOX 117, ASHLAND, WI 54806-0117
PO BOX 118, ASHLAND, WI 54806-0118
PO BOX 119, ASHLAND, WI 54806-0119
PO BOX 120, ASHLAND, WI 54806-0120
PO BOX 121, ASHLAND, WI 54806-0121
PO BOX 122, ASHLAND, WI 54806-0122
PO BOX 123, ASHLAND, WI 54806-0123
PO BOX 124, ASHLAND, WI 54806-0124
PO BOX 125, ASHLAND, WI 54806-0125
PO BOX 126, ASHLAND, WI 54806-0126
PO BOX 127, ASHLAND, WI 54806-0127
PO BOX 128, ASHLAND, WI 54806-0128
PO BOX 129, ASHLAND, WI 54806-0129
PO BOX 130, ASHLAND, WI 54806-0130
PO BOX 131, ASHLAND, WI 54806-0131
PO BOX 132, ASHLAND, WI 54806-0132
PO BOX 133, ASHLAND, WI 54806-0133
PO BOX 134, ASHLAND, WI 54806-0134
PO BOX 135, ASHLAND, WI 54806-0135
PO BOX 136, ASHLAND, WI 54806-0136
PO BOX 137, ASHLAND, WI 54806-0137
PO BOX 138, ASHLAND, WI 54806-0138
PO BOX 139, ASHLAND, WI 54806-0139
PO BOX 140, ASHLAND, WI 54806-0140
PO BOX 141, ASHLAND, WI 54806-0141
PO BOX 142, ASHLAND, WI 54806-0142
PO BOX 143, ASHLAND, WI 54806-0143
PO BOX 144, ASHLAND, WI 54806-0144
PO BOX 145, ASHLAND, WI 54806-0145
PO BOX 146, ASHLAND, WI 54806-0146
PO BOX 147, ASHLAND, WI 54806-0147
PO BOX 148, ASHLAND, WI 54806-0148
PO BOX 149, ASHLAND, WI 54806-0149
PO BOX 150, ASHLAND, WI 54806-0150
PO BOX 151, ASHLAND, WI 54806-0151
PO BOX 152, ASHLAND, WI 54806-0152
PO BOX 153, ASHLAND, WI 54806-0153
PO BOX 154, ASHLAND, WI 54806-0154
PO BOX 155, ASHLAND, WI 54806-0155
PO BOX 156, ASHLAND, WI 54806-0156
PO BOX 157, ASHLAND, WI 54806-0157
PO BOX 158, ASHLAND, WI 54806-0158
PO BOX 159, ASHLAND, WI 54806-0159
PO BOX 160, ASHLAND, WI 54806-0160
PO BOX 161, ASHLAND, WI 54806-0161
PO BOX 162, ASHLAND, WI 54806-0162
PO BOX 163, ASHLAND, WI 54806-0163
PO BOX 164, ASHLAND, WI 54806-0164
PO BOX 165, ASHLAND, WI 54806-0165
PO BOX 166, ASHLAND, WI 54806-0166
PO BOX 167, ASHLAND, WI 54806-0167
PO BOX 168, ASHLAND, WI 54806-0168
PO BOX 169, ASHLAND, WI 54806-0169
PO BOX 170, ASHLAND, WI 54806-0170
PO BOX 171, ASHLAND, WI 54806-0171
PO BOX 172, ASHLAND, WI 54806-0172
PO BOX 173, ASHLAND, WI 54806-0173
PO BOX 174, ASHLAND, WI 54806-0174
PO BOX 175, ASHLAND, WI 54806-0175
PO BOX 176, ASHLAND, WI 54806-0176
PO BOX 177, ASHLAND, WI 54806-0177
PO BOX 178, ASHLAND, WI 54806-0178
PO BOX 179, ASHLAND, WI 54806-0179
PO BOX 180, ASHLAND, WI 54806-0180
PO BOX 181, ASHLAND, WI 54806-0181
PO BOX 182, ASHLAND, WI 54806-0182
PO BOX 183, ASHLAND, WI 54806-0183
PO BOX 184, ASHLAND, WI 54806-0184
PO BOX 185, ASHLAND, WI 54806-0185
PO BOX 186, ASHLAND, WI 54806-0186
PO BOX 187, ASHLAND, WI 54806-0187
PO BOX 188, ASHLAND, WI 54806-0188
PO BOX 189, ASHLAND, WI 54806-0189
PO BOX 190, ASHLAND, WI 54806-0190
PO BOX 191, ASHLAND, WI 54806-0191
PO BOX 192, ASHLAND, WI 54806-0192
PO BOX 193, ASHLAND, WI 54806-0193
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