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 169, IOWA CITY, IA 52244-0169
PO BOX 170, IOWA CITY, IA 52244-0170
PO BOX 171, IOWA CITY, IA 52244-0171
PO BOX 172, IOWA CITY, IA 52244-0172
PO BOX 173, IOWA CITY, IA 52244-0173
PO BOX 174, IOWA CITY, IA 52244-0174
PO BOX 175, IOWA CITY, IA 52244-0175
PO BOX 176, IOWA CITY, IA 52244-0176
PO BOX 177, IOWA CITY, IA 52244-0177
PO BOX 178, IOWA CITY, IA 52244-0178
PO BOX 179, IOWA CITY, IA 52244-0179
PO BOX 180, IOWA CITY, IA 52244-0180
PO BOX 181, IOWA CITY, IA 52244-0181
PO BOX 182, IOWA CITY, IA 52244-0182
PO BOX 183, IOWA CITY, IA 52244-0183
PO BOX 184, IOWA CITY, IA 52244-0184
PO BOX 185, IOWA CITY, IA 52244-0185
PO BOX 186, IOWA CITY, IA 52244-0186
PO BOX 187, IOWA CITY, IA 52244-0187
PO BOX 188, IOWA CITY, IA 52244-0188
PO BOX 189, IOWA CITY, IA 52244-0189
PO BOX 190, IOWA CITY, IA 52244-0190
PO BOX 191, IOWA CITY, IA 52244-0191
PO BOX 192, IOWA CITY, IA 52244-0192
PO BOX 193, IOWA CITY, IA 52244-0193
PO BOX 194, IOWA CITY, IA 52244-0194
PO BOX 195, IOWA CITY, IA 52244-0195
PO BOX 196, IOWA CITY, IA 52244-0196
PO BOX 197, IOWA CITY, IA 52244-0197
PO BOX 198, IOWA CITY, IA 52244-0198
PO BOX 199, IOWA CITY, IA 52244-0199
PO BOX 200, IOWA CITY, IA 52244-0200
PO BOX 201, IOWA CITY, IA 52244-0201
PO BOX 202, IOWA CITY, IA 52244-0202
PO BOX 203, IOWA CITY, IA 52244-0203
PO BOX 204, IOWA CITY, IA 52244-0204
PO BOX 205, IOWA CITY, IA 52244-0205
PO BOX 206, IOWA CITY, IA 52244-0206
PO BOX 207, IOWA CITY, IA 52244-0207
PO BOX 208, IOWA CITY, IA 52244-0208
PO BOX 209, IOWA CITY, IA 52244-0209
PO BOX 210, IOWA CITY, IA 52244-0210
PO BOX 211, IOWA CITY, IA 52244-0211
PO BOX 212, IOWA CITY, IA 52244-0212
PO BOX 213, IOWA CITY, IA 52244-0213
PO BOX 214, IOWA CITY, IA 52244-0214
PO BOX 215, IOWA CITY, IA 52244-0215
PO BOX 216, IOWA CITY, IA 52244-0216
PO BOX 217, IOWA CITY, IA 52244-0217
PO BOX 218, IOWA CITY, IA 52244-0218
PO BOX 219, IOWA CITY, IA 52244-0219
PO BOX 220, IOWA CITY, IA 52244-0220
PO BOX 221, IOWA CITY, IA 52244-0221
PO BOX 222, IOWA CITY, IA 52244-0222
PO BOX 223, IOWA CITY, IA 52244-0223
PO BOX 224, IOWA CITY, IA 52244-0224
PO BOX 225, IOWA CITY, IA 52244-0225
PO BOX 226, IOWA CITY, IA 52244-0226
PO BOX 227, IOWA CITY, IA 52244-0227
PO BOX 228, IOWA CITY, IA 52244-0228
PO BOX 229, IOWA CITY, IA 52244-0229
PO BOX 230, IOWA CITY, IA 52244-0230
PO BOX 231, IOWA CITY, IA 52244-0231
PO BOX 232, IOWA CITY, IA 52244-0232
PO BOX 233, IOWA CITY, IA 52244-0233
PO BOX 234, IOWA CITY, IA 52244-0234
PO BOX 235, IOWA CITY, IA 52244-0235
PO BOX 236, IOWA CITY, IA 52244-0236
PO BOX 237, IOWA CITY, IA 52244-0237
PO BOX 238, IOWA CITY, IA 52244-0238
PO BOX 239, IOWA CITY, IA 52244-0239
PO BOX 240, IOWA CITY, IA 52244-0240
PO BOX 241, IOWA CITY, IA 52244-0241
PO BOX 242, IOWA CITY, IA 52244-0242
PO BOX 243, IOWA CITY, IA 52244-0243
PO BOX 244, IOWA CITY, IA 52244-0244
PO BOX 245, IOWA CITY, IA 52244-0245
PO BOX 246, IOWA CITY, IA 52244-0246
PO BOX 247, IOWA CITY, IA 52244-0247
PO BOX 248, IOWA CITY, IA 52244-0248
PO BOX 249, IOWA CITY, IA 52244-0249
PO BOX 250, IOWA CITY, IA 52244-0250
PO BOX 251, IOWA CITY, IA 52244-0251
PO BOX 252, IOWA CITY, IA 52244-0252
PO BOX 253, IOWA CITY, IA 52244-0253
PO BOX 254, IOWA CITY, IA 52244-0254
PO BOX 255, IOWA CITY, IA 52244-0255
PO BOX 256, IOWA CITY, IA 52244-0256
PO BOX 257, IOWA CITY, IA 52244-0257
PO BOX 258, IOWA CITY, IA 52244-0258
PO BOX 259, IOWA CITY, IA 52244-0259
PO BOX 260, IOWA CITY, IA 52244-0260
PO BOX 261, IOWA CITY, IA 52244-0261
PO BOX 262, IOWA CITY, IA 52244-0262
PO BOX 263, IOWA CITY, IA 52244-0263
PO BOX 264, IOWA CITY, IA 52244-0264
PO BOX 265, IOWA CITY, IA 52244-0265
PO BOX 266, IOWA CITY, IA 52244-0266
PO BOX 267, IOWA CITY, IA 52244-0267
PO BOX 268, IOWA CITY, IA 52244-0268
PO BOX 269, IOWA CITY, IA 52244-0269
PO BOX 270, IOWA CITY, IA 52244-0270
PO BOX 271, IOWA CITY, IA 52244-0271
PO BOX 272, IOWA CITY, IA 52244-0272
PO BOX 273, IOWA CITY, IA 52244-0273
PO BOX 274, IOWA CITY, IA 52244-0274
PO BOX 275, IOWA CITY, IA 52244-0275
PO BOX 276, IOWA CITY, IA 52244-0276
PO BOX 277, IOWA CITY, IA 52244-0277
PO BOX 278, IOWA CITY, IA 52244-0278
PO BOX 279, IOWA CITY, IA 52244-0279
PO BOX 280, IOWA CITY, IA 52244-0280
PO BOX 281, IOWA CITY, IA 52244-0281
PO BOX 282, IOWA CITY, IA 52244-0282
PO BOX 283, IOWA CITY, IA 52244-0283
PO BOX 284, IOWA CITY, IA 52244-0284
PO BOX 285, IOWA CITY, IA 52244-0285
PO BOX 286, IOWA CITY, IA 52244-0286
PO BOX 287, IOWA CITY, IA 52244-0287
PO BOX 288, IOWA CITY, IA 52244-0288
PO BOX 289, IOWA CITY, IA 52244-0289
PO BOX 290, IOWA CITY, IA 52244-0290
PO BOX 291, IOWA CITY, IA 52244-0291
PO BOX 292, IOWA CITY, IA 52244-0292
PO BOX 293, IOWA CITY, IA 52244-0293
PO BOX 294, IOWA CITY, IA 52244-0294
PO BOX 295, IOWA CITY, IA 52244-0295
PO BOX 296, IOWA CITY, IA 52244-0296
PO BOX 297, IOWA CITY, IA 52244-0297
PO BOX 298, IOWA CITY, IA 52244-0298
PO BOX 299, IOWA CITY, IA 52244-0299
PO BOX 300, IOWA CITY, IA 52244-0300
PO BOX 301, IOWA CITY, IA 52244-0301
PO BOX 302, IOWA CITY, IA 52244-0302
PO BOX 303, IOWA CITY, IA 52244-0303
PO BOX 304, IOWA CITY, IA 52244-0304
PO BOX 305, IOWA CITY, IA 52244-0305
PO BOX 306, IOWA CITY, IA 52244-0306
PO BOX 307, IOWA CITY, IA 52244-0307
PO BOX 308, IOWA CITY, IA 52244-0308
PO BOX 309, IOWA CITY, IA 52244-0309
PO BOX 310, IOWA CITY, IA 52244-0310
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