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 55, ROCKFORD, IA 50468-0055
PO BOX 56, ROCKFORD, IA 50468-0056
PO BOX 57, ROCKFORD, IA 50468-0057
PO BOX 58, ROCKFORD, IA 50468-0058
PO BOX 59, ROCKFORD, IA 50468-0059
PO BOX 60, ROCKFORD, IA 50468-0060
PO BOX 61, ROCKFORD, IA 50468-0061
PO BOX 62, ROCKFORD, IA 50468-0062
PO BOX 63, ROCKFORD, IA 50468-0063
PO BOX 64, ROCKFORD, IA 50468-0064
PO BOX 65, ROCKFORD, IA 50468-0065
PO BOX 66, ROCKFORD, IA 50468-0066
PO BOX 67, ROCKFORD, IA 50468-0067
PO BOX 68, ROCKFORD, IA 50468-0068
PO BOX 69, ROCKFORD, IA 50468-0069
PO BOX 70, ROCKFORD, IA 50468-0070
PO BOX 71, ROCKFORD, IA 50468-0071
PO BOX 72, ROCKFORD, IA 50468-0072
PO BOX 73, ROCKFORD, IA 50468-0073
PO BOX 74, ROCKFORD, IA 50468-0074
PO BOX 75, ROCKFORD, IA 50468-0075
PO BOX 76, ROCKFORD, IA 50468-0076
PO BOX 77, ROCKFORD, IA 50468-0077
PO BOX 78, ROCKFORD, IA 50468-0078
PO BOX 79, ROCKFORD, IA 50468-0079
PO BOX 80, ROCKFORD, IA 50468-0080
PO BOX 81, ROCKFORD, IA 50468-0081
PO BOX 82, ROCKFORD, IA 50468-0082
PO BOX 83, ROCKFORD, IA 50468-0083
PO BOX 84, ROCKFORD, IA 50468-0084
PO BOX 85, ROCKFORD, IA 50468-0085
PO BOX 86, ROCKFORD, IA 50468-0086
PO BOX 87, ROCKFORD, IA 50468-0087
PO BOX 88, ROCKFORD, IA 50468-0088
PO BOX 89, ROCKFORD, IA 50468-0089
PO BOX 90, ROCKFORD, IA 50468-0090
PO BOX 91, ROCKFORD, IA 50468-0091
PO BOX 92, ROCKFORD, IA 50468-0092
PO BOX 93, ROCKFORD, IA 50468-0093
PO BOX 94, ROCKFORD, IA 50468-0094
PO BOX 95, ROCKFORD, IA 50468-0095
PO BOX 96, ROCKFORD, IA 50468-0096
PO BOX 97, ROCKFORD, IA 50468-0097
PO BOX 98, ROCKFORD, IA 50468-0098
PO BOX 99, ROCKFORD, IA 50468-0099
PO BOX 100, ROCKFORD, IA 50468-0100
PO BOX 101, ROCKFORD, IA 50468-0101
PO BOX 102, ROCKFORD, IA 50468-0102
PO BOX 103, ROCKFORD, IA 50468-0103
PO BOX 104, ROCKFORD, IA 50468-0104
PO BOX 105, ROCKFORD, IA 50468-0105
PO BOX 106, ROCKFORD, IA 50468-0106
PO BOX 107, ROCKFORD, IA 50468-0107
PO BOX 108, ROCKFORD, IA 50468-0108
PO BOX 109, ROCKFORD, IA 50468-0109
PO BOX 110, ROCKFORD, IA 50468-0110
PO BOX 111, ROCKFORD, IA 50468-0111
PO BOX 112, ROCKFORD, IA 50468-0112
PO BOX 113, ROCKFORD, IA 50468-0113
PO BOX 114, ROCKFORD, IA 50468-0114
PO BOX 115, ROCKFORD, IA 50468-0115
PO BOX 116, ROCKFORD, IA 50468-0116
PO BOX 117, ROCKFORD, IA 50468-0117
PO BOX 118, ROCKFORD, IA 50468-0118
PO BOX 119, ROCKFORD, IA 50468-0119
PO BOX 120, ROCKFORD, IA 50468-0120
PO BOX 121, ROCKFORD, IA 50468-0121
PO BOX 122, ROCKFORD, IA 50468-0122
PO BOX 123, ROCKFORD, IA 50468-0123
PO BOX 124, ROCKFORD, IA 50468-0124
PO BOX 125, ROCKFORD, IA 50468-0125
PO BOX 126, ROCKFORD, IA 50468-0126
PO BOX 127, ROCKFORD, IA 50468-0127
PO BOX 128, ROCKFORD, IA 50468-0128
PO BOX 129, ROCKFORD, IA 50468-0129
PO BOX 130, ROCKFORD, IA 50468-0130
PO BOX 131, ROCKFORD, IA 50468-0131
PO BOX 132, ROCKFORD, IA 50468-0132
PO BOX 133, ROCKFORD, IA 50468-0133
PO BOX 134, ROCKFORD, IA 50468-0134
PO BOX 135, ROCKFORD, IA 50468-0135
PO BOX 136, ROCKFORD, IA 50468-0136
PO BOX 137, ROCKFORD, IA 50468-0137
PO BOX 138, ROCKFORD, IA 50468-0138
PO BOX 139, ROCKFORD, IA 50468-0139
PO BOX 140, ROCKFORD, IA 50468-0140
PO BOX 141, ROCKFORD, IA 50468-0141
PO BOX 142, ROCKFORD, IA 50468-0142
PO BOX 143, ROCKFORD, IA 50468-0143
PO BOX 144, ROCKFORD, IA 50468-0144
PO BOX 145, ROCKFORD, IA 50468-0145
PO BOX 146, ROCKFORD, IA 50468-0146
PO BOX 147, ROCKFORD, IA 50468-0147
PO BOX 148, ROCKFORD, IA 50468-0148
PO BOX 149, ROCKFORD, IA 50468-0149
PO BOX 150, ROCKFORD, IA 50468-0150
PO BOX 151, ROCKFORD, IA 50468-0151
PO BOX 152, ROCKFORD, IA 50468-0152
PO BOX 153, ROCKFORD, IA 50468-0153
PO BOX 154, ROCKFORD, IA 50468-0154
PO BOX 155, ROCKFORD, IA 50468-0155
PO BOX 156, ROCKFORD, IA 50468-0156
PO BOX 157, ROCKFORD, IA 50468-0157
PO BOX 158, ROCKFORD, IA 50468-0158
PO BOX 159, ROCKFORD, IA 50468-0159
PO BOX 160, ROCKFORD, IA 50468-0160
PO BOX 161, ROCKFORD, IA 50468-0161
PO BOX 162, ROCKFORD, IA 50468-0162
PO BOX 163, ROCKFORD, IA 50468-0163
PO BOX 164, ROCKFORD, IA 50468-0164
PO BOX 165, ROCKFORD, IA 50468-0165
PO BOX 166, ROCKFORD, IA 50468-0166
PO BOX 167, ROCKFORD, IA 50468-0167
PO BOX 168, ROCKFORD, IA 50468-0168
PO BOX 169, ROCKFORD, IA 50468-0169
PO BOX 170, ROCKFORD, IA 50468-0170
PO BOX 171, ROCKFORD, IA 50468-0171
PO BOX 172, ROCKFORD, IA 50468-0172
PO BOX 173, ROCKFORD, IA 50468-0173
PO BOX 174, ROCKFORD, IA 50468-0174
PO BOX 175, ROCKFORD, IA 50468-0175
PO BOX 176, ROCKFORD, IA 50468-0176
PO BOX 177, ROCKFORD, IA 50468-0177
PO BOX 178, ROCKFORD, IA 50468-0178
PO BOX 179, ROCKFORD, IA 50468-0179
PO BOX 180, ROCKFORD, IA 50468-0180
PO BOX 181, ROCKFORD, IA 50468-0181
PO BOX 182, ROCKFORD, IA 50468-0182
PO BOX 183, ROCKFORD, IA 50468-0183
PO BOX 184, ROCKFORD, IA 50468-0184
PO BOX 185, ROCKFORD, IA 50468-0185
PO BOX 186, ROCKFORD, IA 50468-0186
PO BOX 187, ROCKFORD, IA 50468-0187
PO BOX 188, ROCKFORD, IA 50468-0188
PO BOX 189, ROCKFORD, IA 50468-0189
PO BOX 190, ROCKFORD, IA 50468-0190
PO BOX 191, ROCKFORD, IA 50468-0191
PO BOX 192, ROCKFORD, IA 50468-0192
PO BOX 193, ROCKFORD, IA 50468-0193
PO BOX 194, ROCKFORD, IA 50468-0194
PO BOX 195, ROCKFORD, IA 50468-0195
PO BOX 196, ROCKFORD, IA 50468-0196
PO BOX 197, ROCKFORD, IA 50468-0197
PO BOX 198, ROCKFORD, IA 50468-0198
PO BOX 199, ROCKFORD, IA 50468-0199
PO BOX 200, ROCKFORD, IA 50468-0200
PO BOX 201, ROCKFORD, IA 50468-0201
PO BOX 202, ROCKFORD, IA 50468-0202
PO BOX 203, ROCKFORD, IA 50468-0203
PO BOX 204, ROCKFORD, IA 50468-0204
PO BOX 205, ROCKFORD, IA 50468-0205
PO BOX 206, ROCKFORD, IA 50468-0206
PO BOX 207, ROCKFORD, IA 50468-0207
PO BOX 208, ROCKFORD, IA 50468-0208
PO BOX 209, ROCKFORD, IA 50468-0209
PO BOX 210, ROCKFORD, IA 50468-0210
PO BOX 211, ROCKFORD, IA 50468-0211
PO BOX 212, ROCKFORD, IA 50468-0212
PO BOX 213, ROCKFORD, IA 50468-0213
PO BOX 214, ROCKFORD, IA 50468-0214
PO BOX 215, ROCKFORD, IA 50468-0215
PO BOX 216, ROCKFORD, IA 50468-0216
PO BOX 217, ROCKFORD, IA 50468-0217
PO BOX 218, ROCKFORD, IA 50468-0218
PO BOX 219, ROCKFORD, IA 50468-0219
PO BOX 220, ROCKFORD, IA 50468-0220
PO BOX 221, ROCKFORD, IA 50468-0221
PO BOX 222, ROCKFORD, IA 50468-0222
PO BOX 223, ROCKFORD, IA 50468-0223
PO BOX 224, ROCKFORD, IA 50468-0224
PO BOX 225, ROCKFORD, IA 50468-0225
PO BOX 226, ROCKFORD, IA 50468-0226
PO BOX 227, ROCKFORD, IA 50468-0227
PO BOX 228, ROCKFORD, IA 50468-0228
PO BOX 229, ROCKFORD, IA 50468-0229
PO BOX 230, ROCKFORD, IA 50468-0230
PO BOX 231, ROCKFORD, IA 50468-0231
PO BOX 232, ROCKFORD, IA 50468-0232
PO BOX 233, ROCKFORD, IA 50468-0233
PO BOX 234, ROCKFORD, IA 50468-0234
PO BOX 235, ROCKFORD, IA 50468-0235
PO BOX 236, ROCKFORD, IA 50468-0236
PO BOX 237, ROCKFORD, IA 50468-0237
PO BOX 238, ROCKFORD, IA 50468-0238
PO BOX 239, ROCKFORD, IA 50468-0239
PO BOX 240, ROCKFORD, IA 50468-0240
PO BOX 241, ROCKFORD, IA 50468-0241
PO BOX 242, ROCKFORD, IA 50468-0242
PO BOX 243, ROCKFORD, IA 50468-0243
PO BOX 244, ROCKFORD, IA 50468-0244
PO BOX 245, ROCKFORD, IA 50468-0245
PO BOX 246, ROCKFORD, IA 50468-0246
PO BOX 247, ROCKFORD, IA 50468-0247
PO BOX 248, ROCKFORD, IA 50468-0248
PO BOX 249, ROCKFORD, IA 50468-0249
PO BOX 250, ROCKFORD, IA 50468-0250
PO BOX 251, ROCKFORD, IA 50468-0251
PO BOX 252, ROCKFORD, IA 50468-0252
PO BOX 253, ROCKFORD, IA 50468-0253
PO BOX 254, ROCKFORD, IA 50468-0254
PO BOX 255, ROCKFORD, IA 50468-0255
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