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, HUMPTULIPS, WA 98552-0001
PO BOX 2, HUMPTULIPS, WA 98552-0002
PO BOX 3, HUMPTULIPS, WA 98552-0003
PO BOX 4, HUMPTULIPS, WA 98552-0004
PO BOX 5, HUMPTULIPS, WA 98552-0005
PO BOX 6, HUMPTULIPS, WA 98552-0006
PO BOX 7, HUMPTULIPS, WA 98552-0007
PO BOX 8, HUMPTULIPS, WA 98552-0008
PO BOX 9, HUMPTULIPS, WA 98552-0009
PO BOX 10, HUMPTULIPS, WA 98552-0010
PO BOX 11, HUMPTULIPS, WA 98552-0011
PO BOX 12, HUMPTULIPS, WA 98552-0012
PO BOX 13, HUMPTULIPS, WA 98552-0013
PO BOX 14, HUMPTULIPS, WA 98552-0014
PO BOX 15, HUMPTULIPS, WA 98552-0015
PO BOX 16, HUMPTULIPS, WA 98552-0016
PO BOX 17, HUMPTULIPS, WA 98552-0017
PO BOX 18, HUMPTULIPS, WA 98552-0018
PO BOX 19, HUMPTULIPS, WA 98552-0019
PO BOX 20, HUMPTULIPS, WA 98552-0020
PO BOX 21, HUMPTULIPS, WA 98552-0021
PO BOX 22, HUMPTULIPS, WA 98552-0022
PO BOX 23, HUMPTULIPS, WA 98552-0023
PO BOX 24, HUMPTULIPS, WA 98552-0024
PO BOX 25, HUMPTULIPS, WA 98552-0025
PO BOX 26, HUMPTULIPS, WA 98552-0026
PO BOX 27, HUMPTULIPS, WA 98552-0027
PO BOX 28, HUMPTULIPS, WA 98552-0028
PO BOX 29, HUMPTULIPS, WA 98552-0029
PO BOX 30, HUMPTULIPS, WA 98552-0030
PO BOX 31, HUMPTULIPS, WA 98552-0031
PO BOX 32, HUMPTULIPS, WA 98552-0032
PO BOX 33, HUMPTULIPS, WA 98552-0033
PO BOX 34, HUMPTULIPS, WA 98552-0034
PO BOX 35, HUMPTULIPS, WA 98552-0035
PO BOX 36, HUMPTULIPS, WA 98552-0036
PO BOX 37, HUMPTULIPS, WA 98552-0037
PO BOX 38, HUMPTULIPS, WA 98552-0038
PO BOX 39, HUMPTULIPS, WA 98552-0039
PO BOX 40, HUMPTULIPS, WA 98552-0040
PO BOX 41, HUMPTULIPS, WA 98552-0041
PO BOX 42, HUMPTULIPS, WA 98552-0042
PO BOX 43, HUMPTULIPS, WA 98552-0043
PO BOX 44, HUMPTULIPS, WA 98552-0044
PO BOX 45, HUMPTULIPS, WA 98552-0045
PO BOX 46, HUMPTULIPS, WA 98552-0046
PO BOX 47, HUMPTULIPS, WA 98552-0047
PO BOX 48, HUMPTULIPS, WA 98552-0048
PO BOX 49, HUMPTULIPS, WA 98552-0049
PO BOX 50, HUMPTULIPS, WA 98552-0050
PO BOX 51, HUMPTULIPS, WA 98552-0051
PO BOX 52, HUMPTULIPS, WA 98552-0052
PO BOX 53, HUMPTULIPS, WA 98552-0053
PO BOX 54, HUMPTULIPS, WA 98552-0054
PO BOX 55, HUMPTULIPS, WA 98552-0055
PO BOX 56, HUMPTULIPS, WA 98552-0056
PO BOX 57, HUMPTULIPS, WA 98552-0057
PO BOX 58, HUMPTULIPS, WA 98552-0058
PO BOX 59, HUMPTULIPS, WA 98552-0059
PO BOX 60, HUMPTULIPS, WA 98552-0060
PO BOX 61, HUMPTULIPS, WA 98552-0061
PO BOX 62, HUMPTULIPS, WA 98552-0062
PO BOX 63, HUMPTULIPS, WA 98552-0063
PO BOX 64, HUMPTULIPS, WA 98552-0064
PO BOX 65, HUMPTULIPS, WA 98552-0065
PO BOX 66, HUMPTULIPS, WA 98552-0066
PO BOX 67, HUMPTULIPS, WA 98552-0067
PO BOX 68, HUMPTULIPS, WA 98552-0068
PO BOX 69, HUMPTULIPS, WA 98552-0069
PO BOX 70, HUMPTULIPS, WA 98552-0070
PO BOX 71, HUMPTULIPS, WA 98552-0071
PO BOX 72, HUMPTULIPS, WA 98552-0072
PO BOX 73, HUMPTULIPS, WA 98552-0073
PO BOX 74, HUMPTULIPS, WA 98552-0074
PO BOX 75, HUMPTULIPS, WA 98552-0075
PO BOX 76, HUMPTULIPS, WA 98552-0076
PO BOX 77, HUMPTULIPS, WA 98552-0077
PO BOX 78, HUMPTULIPS, WA 98552-0078
PO BOX 79, HUMPTULIPS, WA 98552-0079
PO BOX 80, HUMPTULIPS, WA 98552-0080
PO BOX 81, HUMPTULIPS, WA 98552-0081
PO BOX 82, HUMPTULIPS, WA 98552-0082
PO BOX 83, HUMPTULIPS, WA 98552-0083
PO BOX 84, HUMPTULIPS, WA 98552-0084
PO BOX 85, HUMPTULIPS, WA 98552-0085
PO BOX 86, HUMPTULIPS, WA 98552-0086
PO BOX 87, HUMPTULIPS, WA 98552-0087
PO BOX 88, HUMPTULIPS, WA 98552-0088
PO BOX 89, HUMPTULIPS, WA 98552-0089
PO BOX 90, HUMPTULIPS, WA 98552-0090
PO BOX 91, HUMPTULIPS, WA 98552-0091
PO BOX 92, HUMPTULIPS, WA 98552-0092
PO BOX 93, HUMPTULIPS, WA 98552-0093
PO BOX 94, HUMPTULIPS, WA 98552-0094
PO BOX 95, HUMPTULIPS, WA 98552-0095
PO BOX 96, HUMPTULIPS, WA 98552-0096
PO BOX 97, HUMPTULIPS, WA 98552-0097
PO BOX 98, HUMPTULIPS, WA 98552-0098
PO BOX 99, HUMPTULIPS, WA 98552-0099
PO BOX 100, HUMPTULIPS, WA 98552-0100
PO BOX 101, HUMPTULIPS, WA 98552-0101
PO BOX 102, HUMPTULIPS, WA 98552-0102
PO BOX 103, HUMPTULIPS, WA 98552-0103
PO BOX 104, HUMPTULIPS, WA 98552-0104
PO BOX 105, HUMPTULIPS, WA 98552-0105
PO BOX 106, HUMPTULIPS, WA 98552-0106
PO BOX 107, HUMPTULIPS, WA 98552-0107
PO BOX 108, HUMPTULIPS, WA 98552-0108
PO BOX 109, HUMPTULIPS, WA 98552-0109
PO BOX 110, HUMPTULIPS, WA 98552-0110
PO BOX 111, HUMPTULIPS, WA 98552-0111
PO BOX 112, HUMPTULIPS, WA 98552-0112
PO BOX 113, HUMPTULIPS, WA 98552-0113
PO BOX 114, HUMPTULIPS, WA 98552-0114
PO BOX 115, HUMPTULIPS, WA 98552-0115
PO BOX 116, HUMPTULIPS, WA 98552-0116
PO BOX 117, HUMPTULIPS, WA 98552-0117
PO BOX 118, HUMPTULIPS, WA 98552-0118
PO BOX 119, HUMPTULIPS, WA 98552-0119
PO BOX 120, HUMPTULIPS, WA 98552-0120
PO BOX 121, HUMPTULIPS, WA 98552-0121
PO BOX 122, HUMPTULIPS, WA 98552-0122
PO BOX 123, HUMPTULIPS, WA 98552-0123
PO BOX 124, HUMPTULIPS, WA 98552-0124
PO BOX 125, HUMPTULIPS, WA 98552-0125
PO BOX 126, HUMPTULIPS, WA 98552-0126
PO BOX 127, HUMPTULIPS, WA 98552-0127
PO BOX 128, HUMPTULIPS, WA 98552-0128
PO BOX 129, HUMPTULIPS, WA 98552-0129
PO BOX 130, HUMPTULIPS, WA 98552-0130
PO BOX 131, HUMPTULIPS, WA 98552-0131
PO BOX 132, HUMPTULIPS, WA 98552-0132
PO BOX 133, HUMPTULIPS, WA 98552-0133
PO BOX 134, HUMPTULIPS, WA 98552-0134
PO BOX 135, HUMPTULIPS, WA 98552-0135
PO BOX 136, HUMPTULIPS, WA 98552-0136
PO BOX 137, HUMPTULIPS, WA 98552-0137
PO BOX 138, HUMPTULIPS, WA 98552-0138
PO BOX 139, HUMPTULIPS, WA 98552-0139
PO BOX 140, HUMPTULIPS, WA 98552-0140
PO BOX 141, HUMPTULIPS, WA 98552-0141
PO BOX 142, HUMPTULIPS, WA 98552-0142
PO BOX 143, HUMPTULIPS, WA 98552-0143
PO BOX 144, HUMPTULIPS, WA 98552-0144
PO BOX 145, HUMPTULIPS, WA 98552-0145
PO BOX 146, HUMPTULIPS, WA 98552-0146
PO BOX 147, HUMPTULIPS, WA 98552-0147
PO BOX 148, HUMPTULIPS, WA 98552-0148
PO BOX 149, HUMPTULIPS, WA 98552-0149
PO BOX 150, HUMPTULIPS, WA 98552-0150
PO BOX 151, HUMPTULIPS, WA 98552-0151
PO BOX 152, HUMPTULIPS, WA 98552-0152
PO BOX 153, HUMPTULIPS, WA 98552-0153
PO BOX 154, HUMPTULIPS, WA 98552-0154
PO BOX 155, HUMPTULIPS, WA 98552-0155
PO BOX 156, HUMPTULIPS, WA 98552-0156
PO BOX 157, HUMPTULIPS, WA 98552-0157
PO BOX 158, HUMPTULIPS, WA 98552-0158
PO BOX 159, HUMPTULIPS, WA 98552-0159
PO BOX 160, HUMPTULIPS, WA 98552-0160
PO BOX 161, HUMPTULIPS, WA 98552-0161
PO BOX 162, HUMPTULIPS, WA 98552-0162
PO BOX 163, HUMPTULIPS, WA 98552-0163
PO BOX 164, HUMPTULIPS, WA 98552-0164
PO BOX 165, HUMPTULIPS, WA 98552-0165
PO BOX 166, HUMPTULIPS, WA 98552-0166
PO BOX 167, HUMPTULIPS, WA 98552-0167
PO BOX 168, HUMPTULIPS, WA 98552-0168
PO BOX 169, HUMPTULIPS, WA 98552-0169
PO BOX 170, HUMPTULIPS, WA 98552-0170
PO BOX 171, HUMPTULIPS, WA 98552-0171
PO BOX 172, HUMPTULIPS, WA 98552-0172
PO BOX 173, HUMPTULIPS, WA 98552-0173
PO BOX 174, HUMPTULIPS, WA 98552-0174
PO BOX 175, HUMPTULIPS, WA 98552-0175
PO BOX 176, HUMPTULIPS, WA 98552-0176
PO BOX 177, HUMPTULIPS, WA 98552-0177
PO BOX 178, HUMPTULIPS, WA 98552-0178
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