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, WHITE RIVER JUNCTION, VT 05001-0181
PO BOX 182, WHITE RIVER JUNCTION, VT 05001-0182
PO BOX 183, WHITE RIVER JUNCTION, VT 05001-0183
PO BOX 184, WHITE RIVER JUNCTION, VT 05001-0184
PO BOX 185, WHITE RIVER JUNCTION, VT 05001-0185
PO BOX 186, WHITE RIVER JUNCTION, VT 05001-0186
PO BOX 187, WHITE RIVER JUNCTION, VT 05001-0187
PO BOX 188, WHITE RIVER JUNCTION, VT 05001-0188
PO BOX 189, WHITE RIVER JUNCTION, VT 05001-0189
PO BOX 190, WHITE RIVER JUNCTION, VT 05001-0190
PO BOX 191, WHITE RIVER JUNCTION, VT 05001-0191
PO BOX 192, WHITE RIVER JUNCTION, VT 05001-0192
PO BOX 193, WHITE RIVER JUNCTION, VT 05001-0193
PO BOX 194, WHITE RIVER JUNCTION, VT 05001-0194
PO BOX 195, WHITE RIVER JUNCTION, VT 05001-0195
PO BOX 196, WHITE RIVER JUNCTION, VT 05001-0196
PO BOX 197, WHITE RIVER JUNCTION, VT 05001-0197
PO BOX 198, WHITE RIVER JUNCTION, VT 05001-0198
PO BOX 199, WHITE RIVER JUNCTION, VT 05001-0199
PO BOX 200, WHITE RIVER JUNCTION, VT 05001-0200
PO BOX 201, WHITE RIVER JUNCTION, VT 05001-0201
PO BOX 202, WHITE RIVER JUNCTION, VT 05001-0202
PO BOX 203, WHITE RIVER JUNCTION, VT 05001-0203
PO BOX 204, WHITE RIVER JUNCTION, VT 05001-0204
PO BOX 205, WHITE RIVER JUNCTION, VT 05001-0205
PO BOX 206, WHITE RIVER JUNCTION, VT 05001-0206
PO BOX 207, WHITE RIVER JUNCTION, VT 05001-0207
PO BOX 208, WHITE RIVER JUNCTION, VT 05001-0208
PO BOX 209, WHITE RIVER JUNCTION, VT 05001-0209
PO BOX 210, WHITE RIVER JUNCTION, VT 05001-0210
PO BOX 211, WHITE RIVER JUNCTION, VT 05001-0211
PO BOX 212, WHITE RIVER JUNCTION, VT 05001-0212
PO BOX 213, WHITE RIVER JUNCTION, VT 05001-0213
PO BOX 214, WHITE RIVER JUNCTION, VT 05001-0214
PO BOX 215, WHITE RIVER JUNCTION, VT 05001-0215
PO BOX 216, WHITE RIVER JUNCTION, VT 05001-0216
PO BOX 217, WHITE RIVER JUNCTION, VT 05001-0217
PO BOX 218, WHITE RIVER JUNCTION, VT 05001-0218
PO BOX 219, WHITE RIVER JUNCTION, VT 05001-0219
PO BOX 220, WHITE RIVER JUNCTION, VT 05001-0220
PO BOX 221, WHITE RIVER JUNCTION, VT 05001-0221
PO BOX 222, WHITE RIVER JUNCTION, VT 05001-0222
PO BOX 223, WHITE RIVER JUNCTION, VT 05001-0223
PO BOX 224, WHITE RIVER JUNCTION, VT 05001-0224
PO BOX 225, WHITE RIVER JUNCTION, VT 05001-0225
PO BOX 226, WHITE RIVER JUNCTION, VT 05001-0226
PO BOX 227, WHITE RIVER JUNCTION, VT 05001-0227
PO BOX 228, WHITE RIVER JUNCTION, VT 05001-0228
PO BOX 229, WHITE RIVER JUNCTION, VT 05001-0229
PO BOX 230, WHITE RIVER JUNCTION, VT 05001-0230
PO BOX 231, WHITE RIVER JUNCTION, VT 05001-0231
PO BOX 232, WHITE RIVER JUNCTION, VT 05001-0232
PO BOX 233, WHITE RIVER JUNCTION, VT 05001-0233
PO BOX 234, WHITE RIVER JUNCTION, VT 05001-0234
PO BOX 235, WHITE RIVER JUNCTION, VT 05001-0235
PO BOX 236, WHITE RIVER JUNCTION, VT 05001-0236
PO BOX 237, WHITE RIVER JUNCTION, VT 05001-0237
PO BOX 238, WHITE RIVER JUNCTION, VT 05001-0238
PO BOX 239, WHITE RIVER JUNCTION, VT 05001-0239
PO BOX 240, WHITE RIVER JUNCTION, VT 05001-0240
PO BOX 241, WHITE RIVER JUNCTION, VT 05001-0241
PO BOX 242, WHITE RIVER JUNCTION, VT 05001-0242
PO BOX 243, WHITE RIVER JUNCTION, VT 05001-0243
PO BOX 244, WHITE RIVER JUNCTION, VT 05001-0244
PO BOX 245, WHITE RIVER JUNCTION, VT 05001-0245
PO BOX 246, WHITE RIVER JUNCTION, VT 05001-0246
PO BOX 247, WHITE RIVER JUNCTION, VT 05001-0247
PO BOX 248, WHITE RIVER JUNCTION, VT 05001-0248
PO BOX 249, WHITE RIVER JUNCTION, VT 05001-0249
PO BOX 250, WHITE RIVER JUNCTION, VT 05001-0250
PO BOX 251, WHITE RIVER JUNCTION, VT 05001-0251
PO BOX 252, WHITE RIVER JUNCTION, VT 05001-0252
PO BOX 253, WHITE RIVER JUNCTION, VT 05001-0253
PO BOX 254, WHITE RIVER JUNCTION, VT 05001-0254
PO BOX 255, WHITE RIVER JUNCTION, VT 05001-0255
PO BOX 256, WHITE RIVER JUNCTION, VT 05001-0256
PO BOX 257, WHITE RIVER JUNCTION, VT 05001-0257
PO BOX 258, WHITE RIVER JUNCTION, VT 05001-0258
PO BOX 259, WHITE RIVER JUNCTION, VT 05001-0259
PO BOX 260, WHITE RIVER JUNCTION, VT 05001-0260
PO BOX 261, WHITE RIVER JUNCTION, VT 05001-0261
PO BOX 262, WHITE RIVER JUNCTION, VT 05001-0262
PO BOX 263, WHITE RIVER JUNCTION, VT 05001-0263
PO BOX 264, WHITE RIVER JUNCTION, VT 05001-0264
PO BOX 265, WHITE RIVER JUNCTION, VT 05001-0265
PO BOX 266, WHITE RIVER JUNCTION, VT 05001-0266
PO BOX 267, WHITE RIVER JUNCTION, VT 05001-0267
PO BOX 268, WHITE RIVER JUNCTION, VT 05001-0268
PO BOX 269, WHITE RIVER JUNCTION, VT 05001-0269
PO BOX 270, WHITE RIVER JUNCTION, VT 05001-0270
PO BOX 271, WHITE RIVER JUNCTION, VT 05001-0271
PO BOX 272, WHITE RIVER JUNCTION, VT 05001-0272
PO BOX 273, WHITE RIVER JUNCTION, VT 05001-0273
PO BOX 274, WHITE RIVER JUNCTION, VT 05001-0274
PO BOX 275, WHITE RIVER JUNCTION, VT 05001-0275
PO BOX 276, WHITE RIVER JUNCTION, VT 05001-0276
PO BOX 277, WHITE RIVER JUNCTION, VT 05001-0277
PO BOX 278, WHITE RIVER JUNCTION, VT 05001-0278
PO BOX 279, WHITE RIVER JUNCTION, VT 05001-0279
PO BOX 280, WHITE RIVER JUNCTION, VT 05001-0280
PO BOX 281, WHITE RIVER JUNCTION, VT 05001-0281
PO BOX 282, WHITE RIVER JUNCTION, VT 05001-0282
PO BOX 283, WHITE RIVER JUNCTION, VT 05001-0283
PO BOX 284, WHITE RIVER JUNCTION, VT 05001-0284
PO BOX 285, WHITE RIVER JUNCTION, VT 05001-0285
PO BOX 286, WHITE RIVER JUNCTION, VT 05001-0286
PO BOX 287, WHITE RIVER JUNCTION, VT 05001-0287
PO BOX 288, WHITE RIVER JUNCTION, VT 05001-0288
PO BOX 289, WHITE RIVER JUNCTION, VT 05001-0289
PO BOX 290, WHITE RIVER JUNCTION, VT 05001-0290
PO BOX 291, WHITE RIVER JUNCTION, VT 05001-0291
PO BOX 292, WHITE RIVER JUNCTION, VT 05001-0292
PO BOX 293, WHITE RIVER JUNCTION, VT 05001-0293
PO BOX 294, WHITE RIVER JUNCTION, VT 05001-0294
PO BOX 295, WHITE RIVER JUNCTION, VT 05001-0295
PO BOX 296, WHITE RIVER JUNCTION, VT 05001-0296
PO BOX 297, WHITE RIVER JUNCTION, VT 05001-0297
PO BOX 298, WHITE RIVER JUNCTION, VT 05001-0298
PO BOX 299, WHITE RIVER JUNCTION, VT 05001-0299
PO BOX 300, WHITE RIVER JUNCTION, VT 05001-0300
PO BOX 301, WHITE RIVER JUNCTION, VT 05001-0301
PO BOX 302, WHITE RIVER JUNCTION, VT 05001-0302
PO BOX 303, WHITE RIVER JUNCTION, VT 05001-0303
PO BOX 304, WHITE RIVER JUNCTION, VT 05001-0304
PO BOX 305, WHITE RIVER JUNCTION, VT 05001-0305
PO BOX 306, WHITE RIVER JUNCTION, VT 05001-0306
PO BOX 307, WHITE RIVER JUNCTION, VT 05001-0307
PO BOX 308, WHITE RIVER JUNCTION, VT 05001-0308
PO BOX 309, WHITE RIVER JUNCTION, VT 05001-0309
PO BOX 310, WHITE RIVER JUNCTION, VT 05001-0310
PO BOX 311, WHITE RIVER JUNCTION, VT 05001-0311
PO BOX 312, WHITE RIVER JUNCTION, VT 05001-0312
PO BOX 313, WHITE RIVER JUNCTION, VT 05001-0313
PO BOX 314, WHITE RIVER JUNCTION, VT 05001-0314
PO BOX 315, WHITE RIVER JUNCTION, VT 05001-0315
PO BOX 316, WHITE RIVER JUNCTION, VT 05001-0316
PO BOX 317, WHITE RIVER JUNCTION, VT 05001-0317
PO BOX 318, WHITE RIVER JUNCTION, VT 05001-0318
PO BOX 319, WHITE RIVER JUNCTION, VT 05001-0319
PO BOX 320, WHITE RIVER JUNCTION, VT 05001-0320
PO BOX 321, WHITE RIVER JUNCTION, VT 05001-0321
PO BOX 322, WHITE RIVER JUNCTION, VT 05001-0322
PO BOX 323, WHITE RIVER JUNCTION, VT 05001-0323
PO BOX 324, WHITE RIVER JUNCTION, VT 05001-0324
PO BOX 325, WHITE RIVER JUNCTION, VT 05001-0325
PO BOX 326, WHITE RIVER JUNCTION, VT 05001-0326
PO BOX 327, WHITE RIVER JUNCTION, VT 05001-0327
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