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 81, ROCK RAPIDS, IA 51246-0081
PO BOX 82, ROCK RAPIDS, IA 51246-0082
PO BOX 83, ROCK RAPIDS, IA 51246-0083
PO BOX 84, ROCK RAPIDS, IA 51246-0084
PO BOX 85, ROCK RAPIDS, IA 51246-0085
PO BOX 86, ROCK RAPIDS, IA 51246-0086
PO BOX 87, ROCK RAPIDS, IA 51246-0087
PO BOX 88, ROCK RAPIDS, IA 51246-0088
PO BOX 89, ROCK RAPIDS, IA 51246-0089
PO BOX 90, ROCK RAPIDS, IA 51246-0090
PO BOX 91, ROCK RAPIDS, IA 51246-0091
PO BOX 92, ROCK RAPIDS, IA 51246-0092
PO BOX 93, ROCK RAPIDS, IA 51246-0093
PO BOX 94, ROCK RAPIDS, IA 51246-0094
PO BOX 95, ROCK RAPIDS, IA 51246-0095
PO BOX 96, ROCK RAPIDS, IA 51246-0096
PO BOX 97, ROCK RAPIDS, IA 51246-0097
PO BOX 98, ROCK RAPIDS, IA 51246-0098
PO BOX 99, ROCK RAPIDS, IA 51246-0099
PO BOX 100, ROCK RAPIDS, IA 51246-0100
PO BOX 101, ROCK RAPIDS, IA 51246-0101
PO BOX 102, ROCK RAPIDS, IA 51246-0102
PO BOX 103, ROCK RAPIDS, IA 51246-0103
PO BOX 104, ROCK RAPIDS, IA 51246-0104
PO BOX 105, ROCK RAPIDS, IA 51246-0105
PO BOX 106, ROCK RAPIDS, IA 51246-0106
PO BOX 107, ROCK RAPIDS, IA 51246-0107
PO BOX 108, ROCK RAPIDS, IA 51246-0108
PO BOX 109, ROCK RAPIDS, IA 51246-0109
PO BOX 110, ROCK RAPIDS, IA 51246-0110
PO BOX 111, ROCK RAPIDS, IA 51246-0111
PO BOX 112, ROCK RAPIDS, IA 51246-0112
PO BOX 113, ROCK RAPIDS, IA 51246-0113
PO BOX 114, ROCK RAPIDS, IA 51246-0114
PO BOX 115, ROCK RAPIDS, IA 51246-0115
PO BOX 116, ROCK RAPIDS, IA 51246-0116
PO BOX 117, ROCK RAPIDS, IA 51246-0117
PO BOX 118, ROCK RAPIDS, IA 51246-0118
PO BOX 119, ROCK RAPIDS, IA 51246-0119
PO BOX 120, ROCK RAPIDS, IA 51246-0120
PO BOX 121, ROCK RAPIDS, IA 51246-0121
PO BOX 122, ROCK RAPIDS, IA 51246-0122
PO BOX 123, ROCK RAPIDS, IA 51246-0123
PO BOX 124, ROCK RAPIDS, IA 51246-0124
PO BOX 125, ROCK RAPIDS, IA 51246-0125
PO BOX 126, ROCK RAPIDS, IA 51246-0126
PO BOX 127, ROCK RAPIDS, IA 51246-0127
PO BOX 128, ROCK RAPIDS, IA 51246-0128
PO BOX 129, ROCK RAPIDS, IA 51246-0129
PO BOX 130, ROCK RAPIDS, IA 51246-0130
PO BOX 131, ROCK RAPIDS, IA 51246-0131
PO BOX 132, ROCK RAPIDS, IA 51246-0132
PO BOX 133, ROCK RAPIDS, IA 51246-0133
PO BOX 134, ROCK RAPIDS, IA 51246-0134
PO BOX 135, ROCK RAPIDS, IA 51246-0135
PO BOX 136, ROCK RAPIDS, IA 51246-0136
PO BOX 137, ROCK RAPIDS, IA 51246-0137
PO BOX 138, ROCK RAPIDS, IA 51246-0138
PO BOX 139, ROCK RAPIDS, IA 51246-0139
PO BOX 140, ROCK RAPIDS, IA 51246-0140
PO BOX 141, ROCK RAPIDS, IA 51246-0141
PO BOX 142, ROCK RAPIDS, IA 51246-0142
PO BOX 143, ROCK RAPIDS, IA 51246-0143
PO BOX 144, ROCK RAPIDS, IA 51246-0144
PO BOX 145, ROCK RAPIDS, IA 51246-0145
PO BOX 146, ROCK RAPIDS, IA 51246-0146
PO BOX 147, ROCK RAPIDS, IA 51246-0147
PO BOX 148, ROCK RAPIDS, IA 51246-0148
PO BOX 149, ROCK RAPIDS, IA 51246-0149
PO BOX 150, ROCK RAPIDS, IA 51246-0150
PO BOX 151, ROCK RAPIDS, IA 51246-0151
PO BOX 152, ROCK RAPIDS, IA 51246-0152
PO BOX 153, ROCK RAPIDS, IA 51246-0153
PO BOX 154, ROCK RAPIDS, IA 51246-0154
PO BOX 155, ROCK RAPIDS, IA 51246-0155
PO BOX 156, ROCK RAPIDS, IA 51246-0156
PO BOX 157, ROCK RAPIDS, IA 51246-0157
PO BOX 158, ROCK RAPIDS, IA 51246-0158
PO BOX 159, ROCK RAPIDS, IA 51246-0159
PO BOX 160, ROCK RAPIDS, IA 51246-0160
PO BOX 161, ROCK RAPIDS, IA 51246-0161
PO BOX 162, ROCK RAPIDS, IA 51246-0162
PO BOX 163, ROCK RAPIDS, IA 51246-0163
PO BOX 164, ROCK RAPIDS, IA 51246-0164
PO BOX 165, ROCK RAPIDS, IA 51246-0165
PO BOX 166, ROCK RAPIDS, IA 51246-0166
PO BOX 167, ROCK RAPIDS, IA 51246-0167
PO BOX 168, ROCK RAPIDS, IA 51246-0168
PO BOX 169, ROCK RAPIDS, IA 51246-0169
PO BOX 170, ROCK RAPIDS, IA 51246-0170
PO BOX 171, ROCK RAPIDS, IA 51246-0171
PO BOX 172, ROCK RAPIDS, IA 51246-0172
PO BOX 173, ROCK RAPIDS, IA 51246-0173
PO BOX 174, ROCK RAPIDS, IA 51246-0174
PO BOX 175, ROCK RAPIDS, IA 51246-0175
PO BOX 176, ROCK RAPIDS, IA 51246-0176
PO BOX 177, ROCK RAPIDS, IA 51246-0177
PO BOX 178, ROCK RAPIDS, IA 51246-0178
PO BOX 179, ROCK RAPIDS, IA 51246-0179
PO BOX 180, ROCK RAPIDS, IA 51246-0180
PO BOX 181, ROCK RAPIDS, IA 51246-0181
PO BOX 182, ROCK RAPIDS, IA 51246-0182
PO BOX 183, ROCK RAPIDS, IA 51246-0183
PO BOX 184, ROCK RAPIDS, IA 51246-0184
PO BOX 185, ROCK RAPIDS, IA 51246-0185
PO BOX 186, ROCK RAPIDS, IA 51246-0186
PO BOX 187, ROCK RAPIDS, IA 51246-0187
PO BOX 188, ROCK RAPIDS, IA 51246-0188
PO BOX 189, ROCK RAPIDS, IA 51246-0189
PO BOX 190, ROCK RAPIDS, IA 51246-0190
PO BOX 191, ROCK RAPIDS, IA 51246-0191
PO BOX 192, ROCK RAPIDS, IA 51246-0192
PO BOX 193, ROCK RAPIDS, IA 51246-0193
PO BOX 194, ROCK RAPIDS, IA 51246-0194
PO BOX 195, ROCK RAPIDS, IA 51246-0195
PO BOX 196, ROCK RAPIDS, IA 51246-0196
PO BOX 197, ROCK RAPIDS, IA 51246-0197
PO BOX 198, ROCK RAPIDS, IA 51246-0198
PO BOX 199, ROCK RAPIDS, IA 51246-0199
PO BOX 200, ROCK RAPIDS, IA 51246-0200
PO BOX 201, ROCK RAPIDS, IA 51246-0201
PO BOX 202, ROCK RAPIDS, IA 51246-0202
PO BOX 203, ROCK RAPIDS, IA 51246-0203
PO BOX 204, ROCK RAPIDS, IA 51246-0204
PO BOX 205, ROCK RAPIDS, IA 51246-0205
PO BOX 206, ROCK RAPIDS, IA 51246-0206
PO BOX 207, ROCK RAPIDS, IA 51246-0207
PO BOX 208, ROCK RAPIDS, IA 51246-0208
PO BOX 209, ROCK RAPIDS, IA 51246-0209
PO BOX 210, ROCK RAPIDS, IA 51246-0210
PO BOX 211, ROCK RAPIDS, IA 51246-0211
PO BOX 212, ROCK RAPIDS, IA 51246-0212
PO BOX 213, ROCK RAPIDS, IA 51246-0213
PO BOX 214, ROCK RAPIDS, IA 51246-0214
PO BOX 215, ROCK RAPIDS, IA 51246-0215
PO BOX 216, ROCK RAPIDS, IA 51246-0216
PO BOX 217, ROCK RAPIDS, IA 51246-0217
PO BOX 218, ROCK RAPIDS, IA 51246-0218
PO BOX 219, ROCK RAPIDS, IA 51246-0219
PO BOX 220, ROCK RAPIDS, IA 51246-0220
PO BOX 221, ROCK RAPIDS, IA 51246-0221
PO BOX 222, ROCK RAPIDS, IA 51246-0222
PO BOX 223, ROCK RAPIDS, IA 51246-0223
PO BOX 224, ROCK RAPIDS, IA 51246-0224
PO BOX 225, ROCK RAPIDS, IA 51246-0225
PO BOX 226, ROCK RAPIDS, IA 51246-0226
PO BOX 227, ROCK RAPIDS, IA 51246-0227
PO BOX 228, ROCK RAPIDS, IA 51246-0228
PO BOX 229, ROCK RAPIDS, IA 51246-0229
PO BOX 230, ROCK RAPIDS, IA 51246-0230
PO BOX 231, ROCK RAPIDS, IA 51246-0231
PO BOX 232, ROCK RAPIDS, IA 51246-0232
PO BOX 233, ROCK RAPIDS, IA 51246-0233
PO BOX 234, ROCK RAPIDS, IA 51246-0234
PO BOX 235, ROCK RAPIDS, IA 51246-0235
PO BOX 236, ROCK RAPIDS, IA 51246-0236
PO BOX 237, ROCK RAPIDS, IA 51246-0237
PO BOX 238, ROCK RAPIDS, IA 51246-0238
PO BOX 239, ROCK RAPIDS, IA 51246-0239
PO BOX 240, ROCK RAPIDS, IA 51246-0240
PO BOX 241, ROCK RAPIDS, IA 51246-0241
PO BOX 242, ROCK RAPIDS, IA 51246-0242
PO BOX 243, ROCK RAPIDS, IA 51246-0243
PO BOX 244, ROCK RAPIDS, IA 51246-0244
PO BOX 245, ROCK RAPIDS, IA 51246-0245
PO BOX 246, ROCK RAPIDS, IA 51246-0246
PO BOX 247, ROCK RAPIDS, IA 51246-0247
PO BOX 248, ROCK RAPIDS, IA 51246-0248
PO BOX 249, ROCK RAPIDS, IA 51246-0249
PO BOX 250, ROCK RAPIDS, IA 51246-0250
PO BOX 251, ROCK RAPIDS, IA 51246-0251
PO BOX 252, ROCK RAPIDS, IA 51246-0252
PO BOX 253, ROCK RAPIDS, IA 51246-0253
PO BOX 254, ROCK RAPIDS, IA 51246-0254
PO BOX 255, ROCK RAPIDS, IA 51246-0255
PO BOX 256, ROCK RAPIDS, IA 51246-0256
PO BOX 257, ROCK RAPIDS, IA 51246-0257
PO BOX 258, ROCK RAPIDS, IA 51246-0258
PO BOX 259, ROCK RAPIDS, IA 51246-0259
PO BOX 260, ROCK RAPIDS, IA 51246-0260
PO BOX 261, ROCK RAPIDS, IA 51246-0261
PO BOX 262, ROCK RAPIDS, IA 51246-0262
PO BOX 263, ROCK RAPIDS, IA 51246-0263
PO BOX 264, ROCK RAPIDS, IA 51246-0264
PO BOX 265, ROCK RAPIDS, IA 51246-0265
PO BOX 266, ROCK RAPIDS, IA 51246-0266
PO BOX 267, ROCK RAPIDS, IA 51246-0267
PO BOX 268, ROCK RAPIDS, IA 51246-0268
PO BOX 269, ROCK RAPIDS, IA 51246-0269
PO BOX 270, ROCK RAPIDS, IA 51246-0270
PO BOX 271, ROCK RAPIDS, IA 51246-0271
PO BOX 272, ROCK RAPIDS, IA 51246-0272
PO BOX 273, ROCK RAPIDS, IA 51246-0273
PO BOX 274, ROCK RAPIDS, IA 51246-0274
PO BOX 275, ROCK RAPIDS, IA 51246-0275
PO BOX 276, ROCK RAPIDS, IA 51246-0276
PO BOX 277, ROCK RAPIDS, IA 51246-0277
PO BOX 278, ROCK RAPIDS, IA 51246-0278
PO BOX 279, ROCK RAPIDS, IA 51246-0279
PO BOX 280, ROCK RAPIDS, IA 51246-0280
PO BOX 281, ROCK RAPIDS, IA 51246-0281
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