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, PHILIPSBURG, MT 59858-0181
PO BOX 182, PHILIPSBURG, MT 59858-0182
PO BOX 183, PHILIPSBURG, MT 59858-0183
PO BOX 184, PHILIPSBURG, MT 59858-0184
PO BOX 185, PHILIPSBURG, MT 59858-0185
PO BOX 186, PHILIPSBURG, MT 59858-0186
PO BOX 187, PHILIPSBURG, MT 59858-0187
PO BOX 188, PHILIPSBURG, MT 59858-0188
PO BOX 189, PHILIPSBURG, MT 59858-0189
PO BOX 190, PHILIPSBURG, MT 59858-0190
PO BOX 191, PHILIPSBURG, MT 59858-0191
PO BOX 192, PHILIPSBURG, MT 59858-0192
PO BOX 193, PHILIPSBURG, MT 59858-0193
PO BOX 194, PHILIPSBURG, MT 59858-0194
PO BOX 195, PHILIPSBURG, MT 59858-0195
PO BOX 196, PHILIPSBURG, MT 59858-0196
PO BOX 197, PHILIPSBURG, MT 59858-0197
PO BOX 198, PHILIPSBURG, MT 59858-0198
PO BOX 199, PHILIPSBURG, MT 59858-0199
PO BOX 200, PHILIPSBURG, MT 59858-0200
PO BOX 201, PHILIPSBURG, MT 59858-0201
PO BOX 202, PHILIPSBURG, MT 59858-0202
PO BOX 203, PHILIPSBURG, MT 59858-0203
PO BOX 204, PHILIPSBURG, MT 59858-0204
PO BOX 205, PHILIPSBURG, MT 59858-0205
PO BOX 206, PHILIPSBURG, MT 59858-0206
PO BOX 207, PHILIPSBURG, MT 59858-0207
PO BOX 208, PHILIPSBURG, MT 59858-0208
PO BOX 209, PHILIPSBURG, MT 59858-0209
PO BOX 210, PHILIPSBURG, MT 59858-0210
PO BOX 211, PHILIPSBURG, MT 59858-0211
PO BOX 212, PHILIPSBURG, MT 59858-0212
PO BOX 213, PHILIPSBURG, MT 59858-0213
PO BOX 214, PHILIPSBURG, MT 59858-0214
PO BOX 215, PHILIPSBURG, MT 59858-0215
PO BOX 216, PHILIPSBURG, MT 59858-0216
PO BOX 217, PHILIPSBURG, MT 59858-0217
PO BOX 218, PHILIPSBURG, MT 59858-0218
PO BOX 219, PHILIPSBURG, MT 59858-0219
PO BOX 220, PHILIPSBURG, MT 59858-0220
PO BOX 221, PHILIPSBURG, MT 59858-0221
PO BOX 222, PHILIPSBURG, MT 59858-0222
PO BOX 223, PHILIPSBURG, MT 59858-0223
PO BOX 224, PHILIPSBURG, MT 59858-0224
PO BOX 225, PHILIPSBURG, MT 59858-0225
PO BOX 226, PHILIPSBURG, MT 59858-0226
PO BOX 227, PHILIPSBURG, MT 59858-0227
PO BOX 228, PHILIPSBURG, MT 59858-0228
PO BOX 229, PHILIPSBURG, MT 59858-0229
PO BOX 230, PHILIPSBURG, MT 59858-0230
PO BOX 231, PHILIPSBURG, MT 59858-0231
PO BOX 232, PHILIPSBURG, MT 59858-0232
PO BOX 233, PHILIPSBURG, MT 59858-0233
PO BOX 234, PHILIPSBURG, MT 59858-0234
PO BOX 235, PHILIPSBURG, MT 59858-0235
PO BOX 236, PHILIPSBURG, MT 59858-0236
PO BOX 237, PHILIPSBURG, MT 59858-0237
PO BOX 238, PHILIPSBURG, MT 59858-0238
PO BOX 239, PHILIPSBURG, MT 59858-0239
PO BOX 240, PHILIPSBURG, MT 59858-0240
PO BOX 241, PHILIPSBURG, MT 59858-0241
PO BOX 242, PHILIPSBURG, MT 59858-0242
PO BOX 243, PHILIPSBURG, MT 59858-0243
PO BOX 244, PHILIPSBURG, MT 59858-0244
PO BOX 245, PHILIPSBURG, MT 59858-0245
PO BOX 246, PHILIPSBURG, MT 59858-0246
PO BOX 247, PHILIPSBURG, MT 59858-0247
PO BOX 248, PHILIPSBURG, MT 59858-0248
PO BOX 249, PHILIPSBURG, MT 59858-0249
PO BOX 250, PHILIPSBURG, MT 59858-0250
PO BOX 251, PHILIPSBURG, MT 59858-0251
PO BOX 252, PHILIPSBURG, MT 59858-0252
PO BOX 253, PHILIPSBURG, MT 59858-0253
PO BOX 254, PHILIPSBURG, MT 59858-0254
PO BOX 255, PHILIPSBURG, MT 59858-0255
PO BOX 256, PHILIPSBURG, MT 59858-0256
PO BOX 257, PHILIPSBURG, MT 59858-0257
PO BOX 258, PHILIPSBURG, MT 59858-0258
PO BOX 259, PHILIPSBURG, MT 59858-0259
PO BOX 260, PHILIPSBURG, MT 59858-0260
PO BOX 261, PHILIPSBURG, MT 59858-0261
PO BOX 262, PHILIPSBURG, MT 59858-0262
PO BOX 263, PHILIPSBURG, MT 59858-0263
PO BOX 264, PHILIPSBURG, MT 59858-0264
PO BOX 265, PHILIPSBURG, MT 59858-0265
PO BOX 266, PHILIPSBURG, MT 59858-0266
PO BOX 267, PHILIPSBURG, MT 59858-0267
PO BOX 268, PHILIPSBURG, MT 59858-0268
PO BOX 269, PHILIPSBURG, MT 59858-0269
PO BOX 270, PHILIPSBURG, MT 59858-0270
PO BOX 271, PHILIPSBURG, MT 59858-0271
PO BOX 272, PHILIPSBURG, MT 59858-0272
PO BOX 273, PHILIPSBURG, MT 59858-0273
PO BOX 274, PHILIPSBURG, MT 59858-0274
PO BOX 275, PHILIPSBURG, MT 59858-0275
PO BOX 276, PHILIPSBURG, MT 59858-0276
PO BOX 277, PHILIPSBURG, MT 59858-0277
PO BOX 278, PHILIPSBURG, MT 59858-0278
PO BOX 279, PHILIPSBURG, MT 59858-0279
PO BOX 280, PHILIPSBURG, MT 59858-0280
PO BOX 281, PHILIPSBURG, MT 59858-0281
PO BOX 282, PHILIPSBURG, MT 59858-0282
PO BOX 283, PHILIPSBURG, MT 59858-0283
PO BOX 284, PHILIPSBURG, MT 59858-0284
PO BOX 285, PHILIPSBURG, MT 59858-0285
PO BOX 286, PHILIPSBURG, MT 59858-0286
PO BOX 287, PHILIPSBURG, MT 59858-0287
PO BOX 288, PHILIPSBURG, MT 59858-0288
PO BOX 289, PHILIPSBURG, MT 59858-0289
PO BOX 290, PHILIPSBURG, MT 59858-0290
PO BOX 291, PHILIPSBURG, MT 59858-0291
PO BOX 292, PHILIPSBURG, MT 59858-0292
PO BOX 293, PHILIPSBURG, MT 59858-0293
PO BOX 294, PHILIPSBURG, MT 59858-0294
PO BOX 295, PHILIPSBURG, MT 59858-0295
PO BOX 296, PHILIPSBURG, MT 59858-0296
PO BOX 297, PHILIPSBURG, MT 59858-0297
PO BOX 298, PHILIPSBURG, MT 59858-0298
PO BOX 299, PHILIPSBURG, MT 59858-0299
PO BOX 300, PHILIPSBURG, MT 59858-0300
PO BOX 301, PHILIPSBURG, MT 59858-0301
PO BOX 302, PHILIPSBURG, MT 59858-0302
PO BOX 303, PHILIPSBURG, MT 59858-0303
PO BOX 304, PHILIPSBURG, MT 59858-0304
PO BOX 305, PHILIPSBURG, MT 59858-0305
PO BOX 306, PHILIPSBURG, MT 59858-0306
PO BOX 307, PHILIPSBURG, MT 59858-0307
PO BOX 308, PHILIPSBURG, MT 59858-0308
PO BOX 309, PHILIPSBURG, MT 59858-0309
PO BOX 310, PHILIPSBURG, MT 59858-0310
PO BOX 311, PHILIPSBURG, MT 59858-0311
PO BOX 312, PHILIPSBURG, MT 59858-0312
PO BOX 313, PHILIPSBURG, MT 59858-0313
PO BOX 314, PHILIPSBURG, MT 59858-0314
PO BOX 315, PHILIPSBURG, MT 59858-0315
PO BOX 316, PHILIPSBURG, MT 59858-0316
PO BOX 317, PHILIPSBURG, MT 59858-0317
PO BOX 318, PHILIPSBURG, MT 59858-0318
PO BOX 319, PHILIPSBURG, MT 59858-0319
PO BOX 320, PHILIPSBURG, MT 59858-0320
PO BOX 321, PHILIPSBURG, MT 59858-0321
PO BOX 322, PHILIPSBURG, MT 59858-0322
PO BOX 323, PHILIPSBURG, MT 59858-0323
PO BOX 324, PHILIPSBURG, MT 59858-0324
PO BOX 325, PHILIPSBURG, MT 59858-0325
PO BOX 326, PHILIPSBURG, MT 59858-0326
PO BOX 327, PHILIPSBURG, MT 59858-0327
PO BOX 328, PHILIPSBURG, MT 59858-0328
PO BOX 329, PHILIPSBURG, MT 59858-0329
PO BOX 330, PHILIPSBURG, MT 59858-0330
PO BOX 331, PHILIPSBURG, MT 59858-0331
PO BOX 332, PHILIPSBURG, MT 59858-0332
PO BOX 333, PHILIPSBURG, MT 59858-0333
PO BOX 334, PHILIPSBURG, MT 59858-0334
PO BOX 335, PHILIPSBURG, MT 59858-0335
PO BOX 336, PHILIPSBURG, MT 59858-0336
PO BOX 337, PHILIPSBURG, MT 59858-0337
PO BOX 338, PHILIPSBURG, MT 59858-0338
PO BOX 339, PHILIPSBURG, MT 59858-0339
PO BOX 340, PHILIPSBURG, MT 59858-0340
PO BOX 341, PHILIPSBURG, MT 59858-0341
PO BOX 342, PHILIPSBURG, MT 59858-0342
PO BOX 343, PHILIPSBURG, MT 59858-0343
PO BOX 344, PHILIPSBURG, MT 59858-0344
PO BOX 345, PHILIPSBURG, MT 59858-0345
PO BOX 346, PHILIPSBURG, MT 59858-0346
PO BOX 347, PHILIPSBURG, MT 59858-0347
PO BOX 348, PHILIPSBURG, MT 59858-0348
PO BOX 349, PHILIPSBURG, MT 59858-0349
PO BOX 350, PHILIPSBURG, MT 59858-0350
PO BOX 351, PHILIPSBURG, MT 59858-0351
PO BOX 352, PHILIPSBURG, MT 59858-0352
PO BOX 353, PHILIPSBURG, MT 59858-0353
PO BOX 354, PHILIPSBURG, MT 59858-0354
PO BOX 355, PHILIPSBURG, MT 59858-0355
PO BOX 356, PHILIPSBURG, MT 59858-0356
PO BOX 357, PHILIPSBURG, MT 59858-0357
PO BOX 358, PHILIPSBURG, MT 59858-0358
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