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, MOUNT MORRIS, IL 61054-0001
PO BOX 2, MOUNT MORRIS, IL 61054-0002
PO BOX 3, MOUNT MORRIS, IL 61054-0003
PO BOX 4, MOUNT MORRIS, IL 61054-0004
PO BOX 5, MOUNT MORRIS, IL 61054-0005
PO BOX 6, MOUNT MORRIS, IL 61054-0006
PO BOX 7, MOUNT MORRIS, IL 61054-0007
PO BOX 8, MOUNT MORRIS, IL 61054-0008
PO BOX 9, MOUNT MORRIS, IL 61054-0009
PO BOX 10, MOUNT MORRIS, IL 61054-0010
PO BOX 11, MOUNT MORRIS, IL 61054-0011
PO BOX 12, MOUNT MORRIS, IL 61054-0012
PO BOX 13, MOUNT MORRIS, IL 61054-0013
PO BOX 14, MOUNT MORRIS, IL 61054-0014
PO BOX 15, MOUNT MORRIS, IL 61054-0015
PO BOX 16, MOUNT MORRIS, IL 61054-0016
PO BOX 17, MOUNT MORRIS, IL 61054-0017
PO BOX 18, MOUNT MORRIS, IL 61054-0018
PO BOX 19, MOUNT MORRIS, IL 61054-0019
PO BOX 20, MOUNT MORRIS, IL 61054-0020
PO BOX 21, MOUNT MORRIS, IL 61054-0021
PO BOX 22, MOUNT MORRIS, IL 61054-0022
PO BOX 23, MOUNT MORRIS, IL 61054-0023
PO BOX 24, MOUNT MORRIS, IL 61054-0024
PO BOX 25, MOUNT MORRIS, IL 61054-0025
PO BOX 26, MOUNT MORRIS, IL 61054-0026
PO BOX 27, MOUNT MORRIS, IL 61054-0027
PO BOX 28, MOUNT MORRIS, IL 61054-0028
PO BOX 29, MOUNT MORRIS, IL 61054-0029
PO BOX 30, MOUNT MORRIS, IL 61054-0030
PO BOX 31, MOUNT MORRIS, IL 61054-0031
PO BOX 32, MOUNT MORRIS, IL 61054-0032
PO BOX 33, MOUNT MORRIS, IL 61054-0033
PO BOX 34, MOUNT MORRIS, IL 61054-0034
PO BOX 35, MOUNT MORRIS, IL 61054-0035
PO BOX 36, MOUNT MORRIS, IL 61054-0036
PO BOX 37, MOUNT MORRIS, IL 61054-0037
PO BOX 38, MOUNT MORRIS, IL 61054-0038
PO BOX 39, MOUNT MORRIS, IL 61054-0039
PO BOX 40, MOUNT MORRIS, IL 61054-0040
PO BOX 41, MOUNT MORRIS, IL 61054-0041
PO BOX 42, MOUNT MORRIS, IL 61054-0042
PO BOX 43, MOUNT MORRIS, IL 61054-0043
PO BOX 44, MOUNT MORRIS, IL 61054-0044
PO BOX 45, MOUNT MORRIS, IL 61054-0045
PO BOX 46, MOUNT MORRIS, IL 61054-0046
PO BOX 47, MOUNT MORRIS, IL 61054-0047
PO BOX 48, MOUNT MORRIS, IL 61054-0048
PO BOX 49, MOUNT MORRIS, IL 61054-0049
PO BOX 50, MOUNT MORRIS, IL 61054-0050
PO BOX 51, MOUNT MORRIS, IL 61054-0051
PO BOX 52, MOUNT MORRIS, IL 61054-0052
PO BOX 53, MOUNT MORRIS, IL 61054-0053
PO BOX 54, MOUNT MORRIS, IL 61054-0054
PO BOX 55, MOUNT MORRIS, IL 61054-0055
PO BOX 56, MOUNT MORRIS, IL 61054-0056
PO BOX 57, MOUNT MORRIS, IL 61054-0057
PO BOX 58, MOUNT MORRIS, IL 61054-0058
PO BOX 59, MOUNT MORRIS, IL 61054-0059
PO BOX 60, MOUNT MORRIS, IL 61054-0060
PO BOX 61, MOUNT MORRIS, IL 61054-0061
PO BOX 62, MOUNT MORRIS, IL 61054-0062
PO BOX 63, MOUNT MORRIS, IL 61054-0063
PO BOX 64, MOUNT MORRIS, IL 61054-0064
PO BOX 65, MOUNT MORRIS, IL 61054-0065
PO BOX 66, MOUNT MORRIS, IL 61054-0066
PO BOX 67, MOUNT MORRIS, IL 61054-0067
PO BOX 68, MOUNT MORRIS, IL 61054-0068
PO BOX 69, MOUNT MORRIS, IL 61054-0069
PO BOX 70, MOUNT MORRIS, IL 61054-0070
PO BOX 71, MOUNT MORRIS, IL 61054-0071
PO BOX 72, MOUNT MORRIS, IL 61054-0072
PO BOX 73, MOUNT MORRIS, IL 61054-0073
PO BOX 74, MOUNT MORRIS, IL 61054-0074
PO BOX 75, MOUNT MORRIS, IL 61054-0075
PO BOX 76, MOUNT MORRIS, IL 61054-0076
PO BOX 77, MOUNT MORRIS, IL 61054-0077
PO BOX 78, MOUNT MORRIS, IL 61054-0078
PO BOX 79, MOUNT MORRIS, IL 61054-0079
PO BOX 80, MOUNT MORRIS, IL 61054-0080
PO BOX 81, MOUNT MORRIS, IL 61054-0081
PO BOX 82, MOUNT MORRIS, IL 61054-0082
PO BOX 83, MOUNT MORRIS, IL 61054-0083
PO BOX 84, MOUNT MORRIS, IL 61054-0084
PO BOX 85, MOUNT MORRIS, IL 61054-0085
PO BOX 86, MOUNT MORRIS, IL 61054-0086
PO BOX 87, MOUNT MORRIS, IL 61054-0087
PO BOX 88, MOUNT MORRIS, IL 61054-0088
PO BOX 89, MOUNT MORRIS, IL 61054-0089
PO BOX 90, MOUNT MORRIS, IL 61054-0090
PO BOX 91, MOUNT MORRIS, IL 61054-0091
PO BOX 92, MOUNT MORRIS, IL 61054-0092
PO BOX 93, MOUNT MORRIS, IL 61054-0093
PO BOX 94, MOUNT MORRIS, IL 61054-0094
PO BOX 95, MOUNT MORRIS, IL 61054-0095
PO BOX 96, MOUNT MORRIS, IL 61054-0096
PO BOX 97, MOUNT MORRIS, IL 61054-0097
PO BOX 98, MOUNT MORRIS, IL 61054-0098
PO BOX 99, MOUNT MORRIS, IL 61054-0099
PO BOX 100, MOUNT MORRIS, IL 61054-0100
PO BOX 101, MOUNT MORRIS, IL 61054-0101
PO BOX 102, MOUNT MORRIS, IL 61054-0102
PO BOX 103, MOUNT MORRIS, IL 61054-0103
PO BOX 104, MOUNT MORRIS, IL 61054-0104
PO BOX 105, MOUNT MORRIS, IL 61054-0105
PO BOX 106, MOUNT MORRIS, IL 61054-0106
PO BOX 107, MOUNT MORRIS, IL 61054-0107
PO BOX 108, MOUNT MORRIS, IL 61054-0108
PO BOX 109, MOUNT MORRIS, IL 61054-0109
PO BOX 110, MOUNT MORRIS, IL 61054-0110
PO BOX 111, MOUNT MORRIS, IL 61054-0111
PO BOX 112, MOUNT MORRIS, IL 61054-0112
PO BOX 113, MOUNT MORRIS, IL 61054-0113
PO BOX 114, MOUNT MORRIS, IL 61054-0114
PO BOX 115, MOUNT MORRIS, IL 61054-0115
PO BOX 116, MOUNT MORRIS, IL 61054-0116
PO BOX 117, MOUNT MORRIS, IL 61054-0117
PO BOX 118, MOUNT MORRIS, IL 61054-0118
PO BOX 119, MOUNT MORRIS, IL 61054-0119
PO BOX 120, MOUNT MORRIS, IL 61054-0120
PO BOX 121, MOUNT MORRIS, IL 61054-0121
PO BOX 122, MOUNT MORRIS, IL 61054-0122
PO BOX 123, MOUNT MORRIS, IL 61054-0123
PO BOX 124, MOUNT MORRIS, IL 61054-0124
PO BOX 125, MOUNT MORRIS, IL 61054-0125
PO BOX 126, MOUNT MORRIS, IL 61054-0126
PO BOX 127, MOUNT MORRIS, IL 61054-0127
PO BOX 128, MOUNT MORRIS, IL 61054-0128
PO BOX 129, MOUNT MORRIS, IL 61054-0129
PO BOX 130, MOUNT MORRIS, IL 61054-0130
PO BOX 131, MOUNT MORRIS, IL 61054-0131
PO BOX 132, MOUNT MORRIS, IL 61054-0132
PO BOX 133, MOUNT MORRIS, IL 61054-0133
PO BOX 134, MOUNT MORRIS, IL 61054-0134
PO BOX 135, MOUNT MORRIS, IL 61054-0135
PO BOX 136, MOUNT MORRIS, IL 61054-0136
PO BOX 137, MOUNT MORRIS, IL 61054-0137
PO BOX 138, MOUNT MORRIS, IL 61054-0138
PO BOX 139, MOUNT MORRIS, IL 61054-0139
PO BOX 140, MOUNT MORRIS, IL 61054-0140
PO BOX 141, MOUNT MORRIS, IL 61054-0141
PO BOX 142, MOUNT MORRIS, IL 61054-0142
PO BOX 143, MOUNT MORRIS, IL 61054-0143
PO BOX 144, MOUNT MORRIS, IL 61054-0144
PO BOX 145, MOUNT MORRIS, IL 61054-0145
PO BOX 146, MOUNT MORRIS, IL 61054-0146
PO BOX 147, MOUNT MORRIS, IL 61054-0147
PO BOX 148, MOUNT MORRIS, IL 61054-0148
PO BOX 149, MOUNT MORRIS, IL 61054-0149
PO BOX 150, MOUNT MORRIS, IL 61054-0150
PO BOX 151, MOUNT MORRIS, IL 61054-0151
PO BOX 152, MOUNT MORRIS, IL 61054-0152
PO BOX 153, MOUNT MORRIS, IL 61054-0153
PO BOX 154, MOUNT MORRIS, IL 61054-0154
PO BOX 155, MOUNT MORRIS, IL 61054-0155
PO BOX 156, MOUNT MORRIS, IL 61054-0156
PO BOX 157, MOUNT MORRIS, IL 61054-0157
PO BOX 158, MOUNT MORRIS, IL 61054-0158
PO BOX 159, MOUNT MORRIS, IL 61054-0159
PO BOX 160, MOUNT MORRIS, IL 61054-0160
PO BOX 161, MOUNT MORRIS, IL 61054-0161
PO BOX 162, MOUNT MORRIS, IL 61054-0162
PO BOX 163, MOUNT MORRIS, IL 61054-0163
PO BOX 164, MOUNT MORRIS, IL 61054-0164
PO BOX 165, MOUNT MORRIS, IL 61054-0165
PO BOX 166, MOUNT MORRIS, IL 61054-0166
PO BOX 167, MOUNT MORRIS, IL 61054-0167
PO BOX 168, MOUNT MORRIS, IL 61054-0168
PO BOX 169, MOUNT MORRIS, IL 61054-0169
PO BOX 170, MOUNT MORRIS, IL 61054-0170
PO BOX 171, MOUNT MORRIS, IL 61054-0171
PO BOX 172, MOUNT MORRIS, IL 61054-0172
PO BOX 173, MOUNT MORRIS, IL 61054-0173
PO BOX 174, MOUNT MORRIS, IL 61054-0174
PO BOX 175, MOUNT MORRIS, IL 61054-0175
PO BOX 176, MOUNT MORRIS, IL 61054-0176
PO BOX 177, MOUNT MORRIS, IL 61054-0177
PO BOX 178, MOUNT MORRIS, IL 61054-0178
PO BOX 179, MOUNT MORRIS, IL 61054-0179
PO BOX 180, MOUNT MORRIS, IL 61054-0180
PO BOX 181, MOUNT MORRIS, IL 61054-0181
PO BOX 182, MOUNT MORRIS, IL 61054-0182
PO BOX 183, MOUNT MORRIS, IL 61054-0183
PO BOX 184, MOUNT MORRIS, IL 61054-0184
PO BOX 185, MOUNT MORRIS, IL 61054-0185
PO BOX 186, MOUNT MORRIS, IL 61054-0186
PO BOX 187, MOUNT MORRIS, IL 61054-0187
PO BOX 188, MOUNT MORRIS, IL 61054-0188
PO BOX 189, MOUNT MORRIS, IL 61054-0189
PO BOX 190, MOUNT MORRIS, IL 61054-0190
PO BOX 191, MOUNT MORRIS, IL 61054-0191
PO BOX 192, MOUNT MORRIS, IL 61054-0192
PO BOX 193, MOUNT MORRIS, IL 61054-0193
PO BOX 194, MOUNT MORRIS, IL 61054-0194
PO BOX 195, MOUNT MORRIS, IL 61054-0195
PO BOX 196, MOUNT MORRIS, IL 61054-0196
PO BOX 197, MOUNT MORRIS, IL 61054-0197
PO BOX 198, MOUNT MORRIS, IL 61054-0198
PO BOX 199, MOUNT MORRIS, IL 61054-0199
PO BOX 200, MOUNT MORRIS, IL 61054-0200
PO BOX 201, MOUNT MORRIS, IL 61054-0201
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