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 161, ROCKWELL CITY, IA 50579-0161
PO BOX 162, ROCKWELL CITY, IA 50579-0162
PO BOX 163, ROCKWELL CITY, IA 50579-0163
PO BOX 164, ROCKWELL CITY, IA 50579-0164
PO BOX 165, ROCKWELL CITY, IA 50579-0165
PO BOX 166, ROCKWELL CITY, IA 50579-0166
PO BOX 167, ROCKWELL CITY, IA 50579-0167
PO BOX 168, ROCKWELL CITY, IA 50579-0168
PO BOX 169, ROCKWELL CITY, IA 50579-0169
PO BOX 170, ROCKWELL CITY, IA 50579-0170
PO BOX 171, ROCKWELL CITY, IA 50579-0171
PO BOX 172, ROCKWELL CITY, IA 50579-0172
PO BOX 173, ROCKWELL CITY, IA 50579-0173
PO BOX 174, ROCKWELL CITY, IA 50579-0174
PO BOX 175, ROCKWELL CITY, IA 50579-0175
PO BOX 176, ROCKWELL CITY, IA 50579-0176
PO BOX 177, ROCKWELL CITY, IA 50579-0177
PO BOX 178, ROCKWELL CITY, IA 50579-0178
PO BOX 179, ROCKWELL CITY, IA 50579-0179
PO BOX 180, ROCKWELL CITY, IA 50579-0180
PO BOX 181, ROCKWELL CITY, IA 50579-0181
PO BOX 182, ROCKWELL CITY, IA 50579-0182
PO BOX 183, ROCKWELL CITY, IA 50579-0183
PO BOX 184, ROCKWELL CITY, IA 50579-0184
PO BOX 185, ROCKWELL CITY, IA 50579-0185
PO BOX 186, ROCKWELL CITY, IA 50579-0186
PO BOX 187, ROCKWELL CITY, IA 50579-0187
PO BOX 188, ROCKWELL CITY, IA 50579-0188
PO BOX 189, ROCKWELL CITY, IA 50579-0189
PO BOX 190, ROCKWELL CITY, IA 50579-0190
PO BOX 191, ROCKWELL CITY, IA 50579-0191
PO BOX 192, ROCKWELL CITY, IA 50579-0192
PO BOX 193, ROCKWELL CITY, IA 50579-0193
PO BOX 194, ROCKWELL CITY, IA 50579-0194
PO BOX 195, ROCKWELL CITY, IA 50579-0195
PO BOX 196, ROCKWELL CITY, IA 50579-0196
PO BOX 197, ROCKWELL CITY, IA 50579-0197
PO BOX 198, ROCKWELL CITY, IA 50579-0198
PO BOX 199, ROCKWELL CITY, IA 50579-0199
PO BOX 200, ROCKWELL CITY, IA 50579-0200
PO BOX 201, ROCKWELL CITY, IA 50579-0201
PO BOX 202, ROCKWELL CITY, IA 50579-0202
PO BOX 203, ROCKWELL CITY, IA 50579-0203
PO BOX 204, ROCKWELL CITY, IA 50579-0204
PO BOX 205, ROCKWELL CITY, IA 50579-0205
PO BOX 206, ROCKWELL CITY, IA 50579-0206
PO BOX 207, ROCKWELL CITY, IA 50579-0207
PO BOX 208, ROCKWELL CITY, IA 50579-0208
PO BOX 209, ROCKWELL CITY, IA 50579-0209
PO BOX 210, ROCKWELL CITY, IA 50579-0210
PO BOX 211, ROCKWELL CITY, IA 50579-0211
PO BOX 212, ROCKWELL CITY, IA 50579-0212
PO BOX 213, ROCKWELL CITY, IA 50579-0213
PO BOX 214, ROCKWELL CITY, IA 50579-0214
PO BOX 215, ROCKWELL CITY, IA 50579-0215
PO BOX 216, ROCKWELL CITY, IA 50579-0216
PO BOX 217, ROCKWELL CITY, IA 50579-0217
PO BOX 218, ROCKWELL CITY, IA 50579-0218
PO BOX 219, ROCKWELL CITY, IA 50579-0219
PO BOX 220, ROCKWELL CITY, IA 50579-0220
PO BOX 221, ROCKWELL CITY, IA 50579-0221
PO BOX 222, ROCKWELL CITY, IA 50579-0222
PO BOX 223, ROCKWELL CITY, IA 50579-0223
PO BOX 224, ROCKWELL CITY, IA 50579-0224
PO BOX 225, ROCKWELL CITY, IA 50579-0225
PO BOX 226, ROCKWELL CITY, IA 50579-0226
PO BOX 227, ROCKWELL CITY, IA 50579-0227
PO BOX 228, ROCKWELL CITY, IA 50579-0228
PO BOX 229, ROCKWELL CITY, IA 50579-0229
PO BOX 230, ROCKWELL CITY, IA 50579-0230
PO BOX 231, ROCKWELL CITY, IA 50579-0231
PO BOX 232, ROCKWELL CITY, IA 50579-0232
PO BOX 233, ROCKWELL CITY, IA 50579-0233
PO BOX 234, ROCKWELL CITY, IA 50579-0234
PO BOX 235, ROCKWELL CITY, IA 50579-0235
PO BOX 236, ROCKWELL CITY, IA 50579-0236
PO BOX 237, ROCKWELL CITY, IA 50579-0237
PO BOX 238, ROCKWELL CITY, IA 50579-0238
PO BOX 239, ROCKWELL CITY, IA 50579-0239
PO BOX 240, ROCKWELL CITY, IA 50579-0240
PO BOX 241, ROCKWELL CITY, IA 50579-0241
PO BOX 242, ROCKWELL CITY, IA 50579-0242
PO BOX 243, ROCKWELL CITY, IA 50579-0243
PO BOX 244, ROCKWELL CITY, IA 50579-0244
PO BOX 245, ROCKWELL CITY, IA 50579-0245
PO BOX 246, ROCKWELL CITY, IA 50579-0246
PO BOX 247, ROCKWELL CITY, IA 50579-0247
PO BOX 248, ROCKWELL CITY, IA 50579-0248
PO BOX 249, ROCKWELL CITY, IA 50579-0249
PO BOX 250, ROCKWELL CITY, IA 50579-0250
PO BOX 251, ROCKWELL CITY, IA 50579-0251
PO BOX 252, ROCKWELL CITY, IA 50579-0252
PO BOX 253, ROCKWELL CITY, IA 50579-0253
PO BOX 254, ROCKWELL CITY, IA 50579-0254
PO BOX 255, ROCKWELL CITY, IA 50579-0255
PO BOX 256, ROCKWELL CITY, IA 50579-0256
PO BOX 257, ROCKWELL CITY, IA 50579-0257
PO BOX 258, ROCKWELL CITY, IA 50579-0258
PO BOX 259, ROCKWELL CITY, IA 50579-0259
PO BOX 260, ROCKWELL CITY, IA 50579-0260
PO BOX 261, ROCKWELL CITY, IA 50579-0261
PO BOX 262, ROCKWELL CITY, IA 50579-0262
PO BOX 263, ROCKWELL CITY, IA 50579-0263
PO BOX 264, ROCKWELL CITY, IA 50579-0264
PO BOX 265, ROCKWELL CITY, IA 50579-0265
PO BOX 266, ROCKWELL CITY, IA 50579-0266
PO BOX 267, ROCKWELL CITY, IA 50579-0267
PO BOX 268, ROCKWELL CITY, IA 50579-0268
PO BOX 269, ROCKWELL CITY, IA 50579-0269
PO BOX 270, ROCKWELL CITY, IA 50579-0270
PO BOX 271, ROCKWELL CITY, IA 50579-0271
PO BOX 272, ROCKWELL CITY, IA 50579-0272
PO BOX 273, ROCKWELL CITY, IA 50579-0273
PO BOX 274, ROCKWELL CITY, IA 50579-0274
PO BOX 275, ROCKWELL CITY, IA 50579-0275
PO BOX 276, ROCKWELL CITY, IA 50579-0276
PO BOX 277, ROCKWELL CITY, IA 50579-0277
PO BOX 278, ROCKWELL CITY, IA 50579-0278
PO BOX 279, ROCKWELL CITY, IA 50579-0279
PO BOX 280, ROCKWELL CITY, IA 50579-0280
PO BOX 281, ROCKWELL CITY, IA 50579-0281
PO BOX 282, ROCKWELL CITY, IA 50579-0282
PO BOX 283, ROCKWELL CITY, IA 50579-0283
PO BOX 284, ROCKWELL CITY, IA 50579-0284
PO BOX 285, ROCKWELL CITY, IA 50579-0285
PO BOX 286, ROCKWELL CITY, IA 50579-0286
PO BOX 287, ROCKWELL CITY, IA 50579-0287
PO BOX 288, ROCKWELL CITY, IA 50579-0288
PO BOX 289, ROCKWELL CITY, IA 50579-0289
PO BOX 290, ROCKWELL CITY, IA 50579-0290
PO BOX 291, ROCKWELL CITY, IA 50579-0291
PO BOX 292, ROCKWELL CITY, IA 50579-0292
PO BOX 293, ROCKWELL CITY, IA 50579-0293
PO BOX 294, ROCKWELL CITY, IA 50579-0294
PO BOX 295, ROCKWELL CITY, IA 50579-0295
PO BOX 296, ROCKWELL CITY, IA 50579-0296
PO BOX 297, ROCKWELL CITY, IA 50579-0297
PO BOX 298, ROCKWELL CITY, IA 50579-0298
PO BOX 299, ROCKWELL CITY, IA 50579-0299
PO BOX 300, ROCKWELL CITY, IA 50579-0300
PO BOX 301, ROCKWELL CITY, IA 50579-0301
PO BOX 302, ROCKWELL CITY, IA 50579-0302
PO BOX 303, ROCKWELL CITY, IA 50579-0303
PO BOX 304, ROCKWELL CITY, IA 50579-0304
PO BOX 305, ROCKWELL CITY, IA 50579-0305
PO BOX 306, ROCKWELL CITY, IA 50579-0306
PO BOX 307, ROCKWELL CITY, IA 50579-0307
PO BOX 308, ROCKWELL CITY, IA 50579-0308
PO BOX 309, ROCKWELL CITY, IA 50579-0309
PO BOX 310, ROCKWELL CITY, IA 50579-0310
PO BOX 311, ROCKWELL CITY, IA 50579-0311
PO BOX 312, ROCKWELL CITY, IA 50579-0312
PO BOX 313, ROCKWELL CITY, IA 50579-0313
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