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, PORTER, OK 74454-0181
PO BOX 182, PORTER, OK 74454-0182
PO BOX 183, PORTER, OK 74454-0183
PO BOX 184, PORTER, OK 74454-0184
PO BOX 185, PORTER, OK 74454-0185
PO BOX 186, PORTER, OK 74454-0186
PO BOX 187, PORTER, OK 74454-0187
PO BOX 188, PORTER, OK 74454-0188
PO BOX 189, PORTER, OK 74454-0189
PO BOX 190, PORTER, OK 74454-0190
PO BOX 191, PORTER, OK 74454-0191
PO BOX 192, PORTER, OK 74454-0192
PO BOX 193, PORTER, OK 74454-0193
PO BOX 194, PORTER, OK 74454-0194
PO BOX 195, PORTER, OK 74454-0195
PO BOX 196, PORTER, OK 74454-0196
PO BOX 197, PORTER, OK 74454-0197
PO BOX 198, PORTER, OK 74454-0198
PO BOX 199, PORTER, OK 74454-0199
PO BOX 200, PORTER, OK 74454-0200
PO BOX 201, PORTER, OK 74454-0201
PO BOX 202, PORTER, OK 74454-0202
PO BOX 203, PORTER, OK 74454-0203
PO BOX 204, PORTER, OK 74454-0204
PO BOX 205, PORTER, OK 74454-0205
PO BOX 206, PORTER, OK 74454-0206
PO BOX 207, PORTER, OK 74454-0207
PO BOX 208, PORTER, OK 74454-0208
PO BOX 209, PORTER, OK 74454-0209
PO BOX 210, PORTER, OK 74454-0210
PO BOX 211, PORTER, OK 74454-0211
PO BOX 212, PORTER, OK 74454-0212
PO BOX 213, PORTER, OK 74454-0213
PO BOX 214, PORTER, OK 74454-0214
PO BOX 215, PORTER, OK 74454-0215
PO BOX 216, PORTER, OK 74454-0216
PO BOX 217, PORTER, OK 74454-0217
PO BOX 218, PORTER, OK 74454-0218
PO BOX 219, PORTER, OK 74454-0219
PO BOX 220, PORTER, OK 74454-0220
PO BOX 221, PORTER, OK 74454-0221
PO BOX 222, PORTER, OK 74454-0222
PO BOX 223, PORTER, OK 74454-0223
PO BOX 224, PORTER, OK 74454-0224
PO BOX 225, PORTER, OK 74454-0225
PO BOX 226, PORTER, OK 74454-0226
PO BOX 227, PORTER, OK 74454-0227
PO BOX 228, PORTER, OK 74454-0228
PO BOX 229, PORTER, OK 74454-0229
PO BOX 230, PORTER, OK 74454-0230
PO BOX 231, PORTER, OK 74454-0231
PO BOX 232, PORTER, OK 74454-0232
PO BOX 233, PORTER, OK 74454-0233
PO BOX 234, PORTER, OK 74454-0234
PO BOX 235, PORTER, OK 74454-0235
PO BOX 236, PORTER, OK 74454-0236
PO BOX 237, PORTER, OK 74454-0237
PO BOX 238, PORTER, OK 74454-0238
PO BOX 239, PORTER, OK 74454-0239
PO BOX 240, PORTER, OK 74454-0240
PO BOX 241, PORTER, OK 74454-0241
PO BOX 242, PORTER, OK 74454-0242
PO BOX 243, PORTER, OK 74454-0243
PO BOX 244, PORTER, OK 74454-0244
PO BOX 245, PORTER, OK 74454-0245
PO BOX 246, PORTER, OK 74454-0246
PO BOX 247, PORTER, OK 74454-0247
PO BOX 248, PORTER, OK 74454-0248
PO BOX 249, PORTER, OK 74454-0249
PO BOX 250, PORTER, OK 74454-0250
PO BOX 251, PORTER, OK 74454-0251
PO BOX 252, PORTER, OK 74454-0252
PO BOX 253, PORTER, OK 74454-0253
PO BOX 254, PORTER, OK 74454-0254
PO BOX 255, PORTER, OK 74454-0255
PO BOX 256, PORTER, OK 74454-0256
PO BOX 257, PORTER, OK 74454-0257
PO BOX 258, PORTER, OK 74454-0258
PO BOX 259, PORTER, OK 74454-0259
PO BOX 260, PORTER, OK 74454-0260
PO BOX 261, PORTER, OK 74454-0261
PO BOX 262, PORTER, OK 74454-0262
PO BOX 263, PORTER, OK 74454-0263
PO BOX 264, PORTER, OK 74454-0264
PO BOX 265, PORTER, OK 74454-0265
PO BOX 266, PORTER, OK 74454-0266
PO BOX 267, PORTER, OK 74454-0267
PO BOX 268, PORTER, OK 74454-0268
PO BOX 269, PORTER, OK 74454-0269
PO BOX 270, PORTER, OK 74454-0270
PO BOX 271, PORTER, OK 74454-0271
PO BOX 272, PORTER, OK 74454-0272
PO BOX 273, PORTER, OK 74454-0273
PO BOX 274, PORTER, OK 74454-0274
PO BOX 275, PORTER, OK 74454-0275
PO BOX 276, PORTER, OK 74454-0276
PO BOX 277, PORTER, OK 74454-0277
PO BOX 278, PORTER, OK 74454-0278
PO BOX 279, PORTER, OK 74454-0279
PO BOX 280, PORTER, OK 74454-0280
PO BOX 281, PORTER, OK 74454-0281
PO BOX 282, PORTER, OK 74454-0282
PO BOX 283, PORTER, OK 74454-0283
PO BOX 284, PORTER, OK 74454-0284
PO BOX 285, PORTER, OK 74454-0285
PO BOX 286, PORTER, OK 74454-0286
PO BOX 287, PORTER, OK 74454-0287
PO BOX 288, PORTER, OK 74454-0288
PO BOX 289, PORTER, OK 74454-0289
PO BOX 290, PORTER, OK 74454-0290
PO BOX 291, PORTER, OK 74454-0291
PO BOX 292, PORTER, OK 74454-0292
PO BOX 293, PORTER, OK 74454-0293
PO BOX 294, PORTER, OK 74454-0294
PO BOX 295, PORTER, OK 74454-0295
PO BOX 296, PORTER, OK 74454-0296
PO BOX 297, PORTER, OK 74454-0297
PO BOX 298, PORTER, OK 74454-0298
PO BOX 299, PORTER, OK 74454-0299
PO BOX 300, PORTER, OK 74454-0300
PO BOX 301, PORTER, OK 74454-0301
PO BOX 302, PORTER, OK 74454-0302
PO BOX 303, PORTER, OK 74454-0303
PO BOX 304, PORTER, OK 74454-0304
PO BOX 305, PORTER, OK 74454-0305
PO BOX 306, PORTER, OK 74454-0306
PO BOX 307, PORTER, OK 74454-0307
PO BOX 308, PORTER, OK 74454-0308
PO BOX 309, PORTER, OK 74454-0309
PO BOX 310, PORTER, OK 74454-0310
PO BOX 311, PORTER, OK 74454-0311
PO BOX 312, PORTER, OK 74454-0312
PO BOX 313, PORTER, OK 74454-0313
PO BOX 314, PORTER, OK 74454-0314
PO BOX 315, PORTER, OK 74454-0315
PO BOX 316, PORTER, OK 74454-0316
PO BOX 317, PORTER, OK 74454-0317
PO BOX 318, PORTER, OK 74454-0318
PO BOX 319, PORTER, OK 74454-0319
PO BOX 320, PORTER, OK 74454-0320
PO BOX 321, PORTER, OK 74454-0321
PO BOX 322, PORTER, OK 74454-0322
PO BOX 323, PORTER, OK 74454-0323
PO BOX 324, PORTER, OK 74454-0324
PO BOX 325, PORTER, OK 74454-0325
PO BOX 326, PORTER, OK 74454-0326
PO BOX 327, PORTER, OK 74454-0327
PO BOX 328, PORTER, OK 74454-0328
PO BOX 329, PORTER, OK 74454-0329
PO BOX 330, PORTER, OK 74454-0330
PO BOX 331, PORTER, OK 74454-0331
PO BOX 332, PORTER, OK 74454-0332
PO BOX 333, PORTER, OK 74454-0333
PO BOX 334, PORTER, OK 74454-0334
PO BOX 335, PORTER, OK 74454-0335
PO BOX 336, PORTER, OK 74454-0336
PO BOX 337, PORTER, OK 74454-0337
PO BOX 338, PORTER, OK 74454-0338
PO BOX 339, PORTER, OK 74454-0339
PO BOX 340, PORTER, OK 74454-0340
PO BOX 341, PORTER, OK 74454-0341
PO BOX 342, PORTER, OK 74454-0342
PO BOX 343, PORTER, OK 74454-0343
PO BOX 344, PORTER, OK 74454-0344
PO BOX 345, PORTER, OK 74454-0345
PO BOX 346, PORTER, OK 74454-0346
PO BOX 347, PORTER, OK 74454-0347
PO BOX 348, PORTER, OK 74454-0348
PO BOX 349, PORTER, OK 74454-0349
PO BOX 350, PORTER, OK 74454-0350
PO BOX 351, PORTER, OK 74454-0351
PO BOX 352, PORTER, OK 74454-0352
PO BOX 353, PORTER, OK 74454-0353
PO BOX 354, PORTER, OK 74454-0354
PO BOX 355, PORTER, OK 74454-0355
PO BOX 356, PORTER, OK 74454-0356
PO BOX 357, PORTER, OK 74454-0357
PO BOX 358, PORTER, OK 74454-0358
PO BOX 359, PORTER, OK 74454-0359
PO BOX 360, PORTER, OK 74454-0360
PO BOX 361, PORTER, OK 74454-0361
PO BOX 362, PORTER, OK 74454-0362
PO BOX 363, PORTER, OK 74454-0363
PO BOX 364, PORTER, OK 74454-0364
PO BOX 365, PORTER, OK 74454-0365
PO BOX 366, PORTER, OK 74454-0366
PO BOX 367, PORTER, OK 74454-0367
PO BOX 368, PORTER, OK 74454-0368
PO BOX 369, PORTER, OK 74454-0369
PO BOX 370, PORTER, OK 74454-0370
PO BOX 371, PORTER, OK 74454-0371
PO BOX 372, PORTER, OK 74454-0372
PO BOX 373, PORTER, OK 74454-0373
PO BOX 374, PORTER, OK 74454-0374
PO BOX 375, PORTER, OK 74454-0375
PO BOX 376, PORTER, OK 74454-0376
PO BOX 377, PORTER, OK 74454-0377
PO BOX 378, PORTER, OK 74454-0378
PO BOX 379, PORTER, OK 74454-0379
PO BOX 380, PORTER, OK 74454-0380
PO BOX 381, PORTER, OK 74454-0381
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