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 181, HIGHLAND PARK, IL 60035-0181
PO BOX 182, HIGHLAND PARK, IL 60035-0182
PO BOX 183, HIGHLAND PARK, IL 60035-0183
PO BOX 184, HIGHLAND PARK, IL 60035-0184
PO BOX 185, HIGHLAND PARK, IL 60035-0185
PO BOX 186, HIGHLAND PARK, IL 60035-0186
PO BOX 187, HIGHLAND PARK, IL 60035-0187
PO BOX 188, HIGHLAND PARK, IL 60035-0188
PO BOX 189, HIGHLAND PARK, IL 60035-0189
PO BOX 190, HIGHLAND PARK, IL 60035-0190
PO BOX 191, HIGHLAND PARK, IL 60035-0191
PO BOX 192, HIGHLAND PARK, IL 60035-0192
PO BOX 193, HIGHLAND PARK, IL 60035-0193
PO BOX 194, HIGHLAND PARK, IL 60035-0194
PO BOX 195, HIGHLAND PARK, IL 60035-0195
PO BOX 196, HIGHLAND PARK, IL 60035-0196
PO BOX 197, HIGHLAND PARK, IL 60035-0197
PO BOX 198, HIGHLAND PARK, IL 60035-0198
PO BOX 199, HIGHLAND PARK, IL 60035-0199
PO BOX 200, HIGHLAND PARK, IL 60035-0200
PO BOX 201, HIGHLAND PARK, IL 60035-0201
PO BOX 202, HIGHLAND PARK, IL 60035-0202
PO BOX 203, HIGHLAND PARK, IL 60035-0203
PO BOX 204, HIGHLAND PARK, IL 60035-0204
PO BOX 205, HIGHLAND PARK, IL 60035-0205
PO BOX 206, HIGHLAND PARK, IL 60035-0206
PO BOX 207, HIGHLAND PARK, IL 60035-0207
PO BOX 208, HIGHLAND PARK, IL 60035-0208
PO BOX 209, HIGHLAND PARK, IL 60035-0209
PO BOX 210, HIGHLAND PARK, IL 60035-0210
PO BOX 211, HIGHLAND PARK, IL 60035-0211
PO BOX 212, HIGHLAND PARK, IL 60035-0212
PO BOX 213, HIGHLAND PARK, IL 60035-0213
PO BOX 214, HIGHLAND PARK, IL 60035-0214
PO BOX 215, HIGHLAND PARK, IL 60035-0215
PO BOX 216, HIGHLAND PARK, IL 60035-0216
PO BOX 217, HIGHLAND PARK, IL 60035-0217
PO BOX 218, HIGHLAND PARK, IL 60035-0218
PO BOX 219, HIGHLAND PARK, IL 60035-0219
PO BOX 220, HIGHLAND PARK, IL 60035-0220
PO BOX 221, HIGHLAND PARK, IL 60035-0221
PO BOX 222, HIGHLAND PARK, IL 60035-0222
PO BOX 223, HIGHLAND PARK, IL 60035-0223
PO BOX 224, HIGHLAND PARK, IL 60035-0224
PO BOX 225, HIGHLAND PARK, IL 60035-0225
PO BOX 226, HIGHLAND PARK, IL 60035-0226
PO BOX 227, HIGHLAND PARK, IL 60035-0227
PO BOX 228, HIGHLAND PARK, IL 60035-0228
PO BOX 229, HIGHLAND PARK, IL 60035-0229
PO BOX 230, HIGHLAND PARK, IL 60035-0230
PO BOX 231, HIGHLAND PARK, IL 60035-0231
PO BOX 232, HIGHLAND PARK, IL 60035-0232
PO BOX 233, HIGHLAND PARK, IL 60035-0233
PO BOX 234, HIGHLAND PARK, IL 60035-0234
PO BOX 235, HIGHLAND PARK, IL 60035-0235
PO BOX 236, HIGHLAND PARK, IL 60035-0236
PO BOX 237, HIGHLAND PARK, IL 60035-0237
PO BOX 238, HIGHLAND PARK, IL 60035-0238
PO BOX 239, HIGHLAND PARK, IL 60035-0239
PO BOX 240, HIGHLAND PARK, IL 60035-0240
PO BOX 241, HIGHLAND PARK, IL 60035-0241
PO BOX 242, HIGHLAND PARK, IL 60035-0242
PO BOX 243, HIGHLAND PARK, IL 60035-0243
PO BOX 244, HIGHLAND PARK, IL 60035-0244
PO BOX 245, HIGHLAND PARK, IL 60035-0245
PO BOX 246, HIGHLAND PARK, IL 60035-0246
PO BOX 247, HIGHLAND PARK, IL 60035-0247
PO BOX 248, HIGHLAND PARK, IL 60035-0248
PO BOX 249, HIGHLAND PARK, IL 60035-0249
PO BOX 250, HIGHLAND PARK, IL 60035-0250
PO BOX 251, HIGHLAND PARK, IL 60035-0251
PO BOX 252, HIGHLAND PARK, IL 60035-0252
PO BOX 253, HIGHLAND PARK, IL 60035-0253
PO BOX 254, HIGHLAND PARK, IL 60035-0254
PO BOX 255, HIGHLAND PARK, IL 60035-0255
PO BOX 256, HIGHLAND PARK, IL 60035-0256
PO BOX 257, HIGHLAND PARK, IL 60035-0257
PO BOX 258, HIGHLAND PARK, IL 60035-0258
PO BOX 259, HIGHLAND PARK, IL 60035-0259
PO BOX 260, HIGHLAND PARK, IL 60035-0260
PO BOX 261, HIGHLAND PARK, IL 60035-0261
PO BOX 262, HIGHLAND PARK, IL 60035-0262
PO BOX 263, HIGHLAND PARK, IL 60035-0263
PO BOX 264, HIGHLAND PARK, IL 60035-0264
PO BOX 265, HIGHLAND PARK, IL 60035-0265
PO BOX 266, HIGHLAND PARK, IL 60035-0266
PO BOX 267, HIGHLAND PARK, IL 60035-0267
PO BOX 268, HIGHLAND PARK, IL 60035-0268
PO BOX 269, HIGHLAND PARK, IL 60035-0269
PO BOX 270, HIGHLAND PARK, IL 60035-0270
PO BOX 271, HIGHLAND PARK, IL 60035-0271
PO BOX 272, HIGHLAND PARK, IL 60035-0272
PO BOX 273, HIGHLAND PARK, IL 60035-0273
PO BOX 274, HIGHLAND PARK, IL 60035-0274
PO BOX 275, HIGHLAND PARK, IL 60035-0275
PO BOX 276, HIGHLAND PARK, IL 60035-0276
PO BOX 277, HIGHLAND PARK, IL 60035-0277
PO BOX 278, HIGHLAND PARK, IL 60035-0278
PO BOX 279, HIGHLAND PARK, IL 60035-0279
PO BOX 280, HIGHLAND PARK, IL 60035-0280
PO BOX 281, HIGHLAND PARK, IL 60035-0281
PO BOX 282, HIGHLAND PARK, IL 60035-0282
PO BOX 283, HIGHLAND PARK, IL 60035-0283
PO BOX 284, HIGHLAND PARK, IL 60035-0284
PO BOX 285, HIGHLAND PARK, IL 60035-0285
PO BOX 286, HIGHLAND PARK, IL 60035-0286
PO BOX 287, HIGHLAND PARK, IL 60035-0287
PO BOX 288, HIGHLAND PARK, IL 60035-0288
PO BOX 289, HIGHLAND PARK, IL 60035-0289
PO BOX 290, HIGHLAND PARK, IL 60035-0290
PO BOX 291, HIGHLAND PARK, IL 60035-0291
PO BOX 292, HIGHLAND PARK, IL 60035-0292
PO BOX 293, HIGHLAND PARK, IL 60035-0293
PO BOX 294, HIGHLAND PARK, IL 60035-0294
PO BOX 295, HIGHLAND PARK, IL 60035-0295
PO BOX 296, HIGHLAND PARK, IL 60035-0296
PO BOX 297, HIGHLAND PARK, IL 60035-0297
PO BOX 298, HIGHLAND PARK, IL 60035-0298
PO BOX 299, HIGHLAND PARK, IL 60035-0299
PO BOX 300, HIGHLAND PARK, IL 60035-0300
PO BOX 301, HIGHLAND PARK, IL 60035-0301
PO BOX 302, HIGHLAND PARK, IL 60035-0302
PO BOX 303, HIGHLAND PARK, IL 60035-0303
PO BOX 304, HIGHLAND PARK, IL 60035-0304
PO BOX 305, HIGHLAND PARK, IL 60035-0305
PO BOX 306, HIGHLAND PARK, IL 60035-0306
PO BOX 307, HIGHLAND PARK, IL 60035-0307
PO BOX 308, HIGHLAND PARK, IL 60035-0308
PO BOX 309, HIGHLAND PARK, IL 60035-0309
PO BOX 310, HIGHLAND PARK, IL 60035-0310
PO BOX 311, HIGHLAND PARK, IL 60035-0311
PO BOX 312, HIGHLAND PARK, IL 60035-0312
PO BOX 313, HIGHLAND PARK, IL 60035-0313
PO BOX 314, HIGHLAND PARK, IL 60035-0314
PO BOX 315, HIGHLAND PARK, IL 60035-0315
PO BOX 316, HIGHLAND PARK, IL 60035-0316
PO BOX 317, HIGHLAND PARK, IL 60035-0317
PO BOX 318, HIGHLAND PARK, IL 60035-0318
PO BOX 319, HIGHLAND PARK, IL 60035-0319
PO BOX 320, HIGHLAND PARK, IL 60035-0320
PO BOX 321, HIGHLAND PARK, IL 60035-0321
PO BOX 322, HIGHLAND PARK, IL 60035-0322
PO BOX 323, HIGHLAND PARK, IL 60035-0323
PO BOX 324, HIGHLAND PARK, IL 60035-0324
PO BOX 325, HIGHLAND PARK, IL 60035-0325
PO BOX 326, HIGHLAND PARK, IL 60035-0326
PO BOX 327, HIGHLAND PARK, IL 60035-0327
PO BOX 328, HIGHLAND PARK, IL 60035-0328
PO BOX 329, HIGHLAND PARK, IL 60035-0329
PO BOX 330, HIGHLAND PARK, IL 60035-0330
PO BOX 331, HIGHLAND PARK, IL 60035-0331
PO BOX 332, HIGHLAND PARK, IL 60035-0332
PO BOX 333, HIGHLAND PARK, IL 60035-0333
PO BOX 334, HIGHLAND PARK, IL 60035-0334
PO BOX 335, HIGHLAND PARK, IL 60035-0335
PO BOX 336, HIGHLAND PARK, IL 60035-0336
PO BOX 337, HIGHLAND PARK, IL 60035-0337
PO BOX 338, HIGHLAND PARK, IL 60035-0338
PO BOX 339, HIGHLAND PARK, IL 60035-0339
PO BOX 340, HIGHLAND PARK, IL 60035-0340
PO BOX 341, HIGHLAND PARK, IL 60035-0341
PO BOX 342, HIGHLAND PARK, IL 60035-0342
PO BOX 343, HIGHLAND PARK, IL 60035-0343
PO BOX 344, HIGHLAND PARK, IL 60035-0344
PO BOX 345, HIGHLAND PARK, IL 60035-0345
PO BOX 346, HIGHLAND PARK, IL 60035-0346
PO BOX 347, HIGHLAND PARK, IL 60035-0347
PO BOX 348, HIGHLAND PARK, IL 60035-0348
PO BOX 349, HIGHLAND PARK, IL 60035-0349
PO BOX 350, HIGHLAND PARK, IL 60035-0350
PO BOX 351, HIGHLAND PARK, IL 60035-0351
PO BOX 352, HIGHLAND PARK, IL 60035-0352
PO BOX 353, HIGHLAND PARK, IL 60035-0353
PO BOX 354, HIGHLAND PARK, IL 60035-0354
PO BOX 355, HIGHLAND PARK, IL 60035-0355
PO BOX 356, HIGHLAND PARK, IL 60035-0356
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