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 21, NORTH BEND, OH 45052-0021
PO BOX 22, NORTH BEND, OH 45052-0022
PO BOX 23, NORTH BEND, OH 45052-0023
PO BOX 24, NORTH BEND, OH 45052-0024
PO BOX 25, NORTH BEND, OH 45052-0025
PO BOX 26, NORTH BEND, OH 45052-0026
PO BOX 27, NORTH BEND, OH 45052-0027
PO BOX 28, NORTH BEND, OH 45052-0028
PO BOX 29, NORTH BEND, OH 45052-0029
PO BOX 30, NORTH BEND, OH 45052-0030
PO BOX 31, NORTH BEND, OH 45052-0031
PO BOX 32, NORTH BEND, OH 45052-0032
PO BOX 33, NORTH BEND, OH 45052-0033
PO BOX 34, NORTH BEND, OH 45052-0034
PO BOX 35, NORTH BEND, OH 45052-0035
PO BOX 36, NORTH BEND, OH 45052-0036
PO BOX 37, NORTH BEND, OH 45052-0037
PO BOX 38, NORTH BEND, OH 45052-0038
PO BOX 39, NORTH BEND, OH 45052-0039
PO BOX 40, NORTH BEND, OH 45052-0040
PO BOX 41, NORTH BEND, OH 45052-0041
PO BOX 42, NORTH BEND, OH 45052-0042
PO BOX 43, NORTH BEND, OH 45052-0043
PO BOX 44, NORTH BEND, OH 45052-0044
PO BOX 45, NORTH BEND, OH 45052-0045
PO BOX 46, NORTH BEND, OH 45052-0046
PO BOX 47, NORTH BEND, OH 45052-0047
PO BOX 48, NORTH BEND, OH 45052-0048
PO BOX 49, NORTH BEND, OH 45052-0049
PO BOX 50, NORTH BEND, OH 45052-0050
PO BOX 51, NORTH BEND, OH 45052-0051
PO BOX 52, NORTH BEND, OH 45052-0052
PO BOX 53, NORTH BEND, OH 45052-0053
PO BOX 54, NORTH BEND, OH 45052-0054
PO BOX 55, NORTH BEND, OH 45052-0055
PO BOX 56, NORTH BEND, OH 45052-0056
PO BOX 57, NORTH BEND, OH 45052-0057
PO BOX 58, NORTH BEND, OH 45052-0058
PO BOX 59, NORTH BEND, OH 45052-0059
PO BOX 60, NORTH BEND, OH 45052-0060
PO BOX 61, NORTH BEND, OH 45052-0061
PO BOX 62, NORTH BEND, OH 45052-0062
PO BOX 63, NORTH BEND, OH 45052-0063
PO BOX 64, NORTH BEND, OH 45052-0064
PO BOX 65, NORTH BEND, OH 45052-0065
PO BOX 66, NORTH BEND, OH 45052-0066
PO BOX 67, NORTH BEND, OH 45052-0067
PO BOX 68, NORTH BEND, OH 45052-0068
PO BOX 69, NORTH BEND, OH 45052-0069
PO BOX 70, NORTH BEND, OH 45052-0070
PO BOX 71, NORTH BEND, OH 45052-0071
PO BOX 72, NORTH BEND, OH 45052-0072
PO BOX 73, NORTH BEND, OH 45052-0073
PO BOX 74, NORTH BEND, OH 45052-0074
PO BOX 75, NORTH BEND, OH 45052-0075
PO BOX 76, NORTH BEND, OH 45052-0076
PO BOX 77, NORTH BEND, OH 45052-0077
PO BOX 78, NORTH BEND, OH 45052-0078
PO BOX 79, NORTH BEND, OH 45052-0079
PO BOX 80, NORTH BEND, OH 45052-0080
PO BOX 81, NORTH BEND, OH 45052-0081
PO BOX 82, NORTH BEND, OH 45052-0082
PO BOX 83, NORTH BEND, OH 45052-0083
PO BOX 84, NORTH BEND, OH 45052-0084
PO BOX 85, NORTH BEND, OH 45052-0085
PO BOX 86, NORTH BEND, OH 45052-0086
PO BOX 87, NORTH BEND, OH 45052-0087
PO BOX 88, NORTH BEND, OH 45052-0088
PO BOX 89, NORTH BEND, OH 45052-0089
PO BOX 90, NORTH BEND, OH 45052-0090
PO BOX 91, NORTH BEND, OH 45052-0091
PO BOX 92, NORTH BEND, OH 45052-0092
PO BOX 93, NORTH BEND, OH 45052-0093
PO BOX 94, NORTH BEND, OH 45052-0094
PO BOX 95, NORTH BEND, OH 45052-0095
PO BOX 96, NORTH BEND, OH 45052-0096
PO BOX 97, NORTH BEND, OH 45052-0097
PO BOX 98, NORTH BEND, OH 45052-0098
PO BOX 99, NORTH BEND, OH 45052-0099
PO BOX 100, NORTH BEND, OH 45052-0100
PO BOX 101, NORTH BEND, OH 45052-0101
PO BOX 102, NORTH BEND, OH 45052-0102
PO BOX 103, NORTH BEND, OH 45052-0103
PO BOX 104, NORTH BEND, OH 45052-0104
PO BOX 105, NORTH BEND, OH 45052-0105
PO BOX 106, NORTH BEND, OH 45052-0106
PO BOX 107, NORTH BEND, OH 45052-0107
PO BOX 108, NORTH BEND, OH 45052-0108
PO BOX 109, NORTH BEND, OH 45052-0109
PO BOX 110, NORTH BEND, OH 45052-0110
PO BOX 111, NORTH BEND, OH 45052-0111
PO BOX 112, NORTH BEND, OH 45052-0112
PO BOX 113, NORTH BEND, OH 45052-0113
PO BOX 114, NORTH BEND, OH 45052-0114
PO BOX 115, NORTH BEND, OH 45052-0115
PO BOX 116, NORTH BEND, OH 45052-0116
PO BOX 117, NORTH BEND, OH 45052-0117
PO BOX 118, NORTH BEND, OH 45052-0118
PO BOX 119, NORTH BEND, OH 45052-0119
PO BOX 120, NORTH BEND, OH 45052-0120
PO BOX 121, NORTH BEND, OH 45052-0121
PO BOX 122, NORTH BEND, OH 45052-0122
PO BOX 123, NORTH BEND, OH 45052-0123
PO BOX 124, NORTH BEND, OH 45052-0124
PO BOX 125, NORTH BEND, OH 45052-0125
PO BOX 126, NORTH BEND, OH 45052-0126
PO BOX 127, NORTH BEND, OH 45052-0127
PO BOX 128, NORTH BEND, OH 45052-0128
PO BOX 129, NORTH BEND, OH 45052-0129
PO BOX 130, NORTH BEND, OH 45052-0130
PO BOX 131, NORTH BEND, OH 45052-0131
PO BOX 132, NORTH BEND, OH 45052-0132
PO BOX 133, NORTH BEND, OH 45052-0133
PO BOX 134, NORTH BEND, OH 45052-0134
PO BOX 135, NORTH BEND, OH 45052-0135
PO BOX 136, NORTH BEND, OH 45052-0136
PO BOX 137, NORTH BEND, OH 45052-0137
PO BOX 138, NORTH BEND, OH 45052-0138
PO BOX 139, NORTH BEND, OH 45052-0139
PO BOX 140, NORTH BEND, OH 45052-0140
PO BOX 141, NORTH BEND, OH 45052-0141
PO BOX 142, NORTH BEND, OH 45052-0142
PO BOX 143, NORTH BEND, OH 45052-0143
PO BOX 144, NORTH BEND, OH 45052-0144
PO BOX 145, NORTH BEND, OH 45052-0145
PO BOX 146, NORTH BEND, OH 45052-0146
PO BOX 147, NORTH BEND, OH 45052-0147
PO BOX 148, NORTH BEND, OH 45052-0148
PO BOX 149, NORTH BEND, OH 45052-0149
PO BOX 150, NORTH BEND, OH 45052-0150
PO BOX 151, NORTH BEND, OH 45052-0151
PO BOX 152, NORTH BEND, OH 45052-0152
PO BOX 153, NORTH BEND, OH 45052-0153
PO BOX 154, NORTH BEND, OH 45052-0154
PO BOX 155, NORTH BEND, OH 45052-0155
PO BOX 156, NORTH BEND, OH 45052-0156
PO BOX 157, NORTH BEND, OH 45052-0157
PO BOX 158, NORTH BEND, OH 45052-0158
PO BOX 159, NORTH BEND, OH 45052-0159
PO BOX 160, NORTH BEND, OH 45052-0160
PO BOX 161, NORTH BEND, OH 45052-0161
PO BOX 162, NORTH BEND, OH 45052-0162
PO BOX 163, NORTH BEND, OH 45052-0163
PO BOX 164, NORTH BEND, OH 45052-0164
PO BOX 165, NORTH BEND, OH 45052-0165
PO BOX 166, NORTH BEND, OH 45052-0166
PO BOX 167, NORTH BEND, OH 45052-0167
PO BOX 168, NORTH BEND, OH 45052-0168
PO BOX 169, NORTH BEND, OH 45052-0169
PO BOX 170, NORTH BEND, OH 45052-0170
PO BOX 171, NORTH BEND, OH 45052-0171
PO BOX 172, NORTH BEND, OH 45052-0172
PO BOX 173, NORTH BEND, OH 45052-0173
PO BOX 174, NORTH BEND, OH 45052-0174
PO BOX 175, NORTH BEND, OH 45052-0175
PO BOX 176, NORTH BEND, OH 45052-0176
PO BOX 177, NORTH BEND, OH 45052-0177
PO BOX 178, NORTH BEND, OH 45052-0178
PO BOX 179, NORTH BEND, OH 45052-0179
PO BOX 180, NORTH BEND, OH 45052-0180
PO BOX 181, NORTH BEND, OH 45052-0181
PO BOX 182, NORTH BEND, OH 45052-0182
PO BOX 183, NORTH BEND, OH 45052-0183
PO BOX 184, NORTH BEND, OH 45052-0184
PO BOX 185, NORTH BEND, OH 45052-0185
PO BOX 186, NORTH BEND, OH 45052-0186
PO BOX 187, NORTH BEND, OH 45052-0187
PO BOX 188, NORTH BEND, OH 45052-0188
PO BOX 189, NORTH BEND, OH 45052-0189
PO BOX 190, NORTH BEND, OH 45052-0190
PO BOX 191, NORTH BEND, OH 45052-0191
PO BOX 192, NORTH BEND, OH 45052-0192
PO BOX 193, NORTH BEND, OH 45052-0193
PO BOX 194, NORTH BEND, OH 45052-0194
PO BOX 195, NORTH BEND, OH 45052-0195
PO BOX 196, NORTH BEND, OH 45052-0196
PO BOX 197, NORTH BEND, OH 45052-0197
PO BOX 198, NORTH BEND, OH 45052-0198
PO BOX 199, NORTH BEND, OH 45052-0199
PO BOX 200, NORTH BEND, OH 45052-0200
PO BOX 201, NORTH BEND, OH 45052-0201
PO BOX 202, NORTH BEND, OH 45052-0202
PO BOX 203, NORTH BEND, OH 45052-0203
PO BOX 204, NORTH BEND, OH 45052-0204
PO BOX 205, NORTH BEND, OH 45052-0205
PO BOX 206, NORTH BEND, OH 45052-0206
PO BOX 207, NORTH BEND, OH 45052-0207
PO BOX 208, NORTH BEND, OH 45052-0208
PO BOX 209, NORTH BEND, OH 45052-0209
PO BOX 210, NORTH BEND, OH 45052-0210
PO BOX 211, NORTH BEND, OH 45052-0211
PO BOX 212, NORTH BEND, OH 45052-0212
PO BOX 213, NORTH BEND, OH 45052-0213
PO BOX 214, NORTH BEND, OH 45052-0214
PO BOX 215, NORTH BEND, OH 45052-0215
PO BOX 216, NORTH BEND, OH 45052-0216
PO BOX 217, NORTH BEND, OH 45052-0217
PO BOX 218, NORTH BEND, OH 45052-0218
PO BOX 219, NORTH BEND, OH 45052-0219
PO BOX 220, NORTH BEND, OH 45052-0220
PO BOX 221, NORTH BEND, OH 45052-0221