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 221, BOUND BROOK, NJ 08805-0221
PO BOX 222, BOUND BROOK, NJ 08805-0222
PO BOX 223, BOUND BROOK, NJ 08805-0223
PO BOX 224, BOUND BROOK, NJ 08805-0224
PO BOX 225, BOUND BROOK, NJ 08805-0225
PO BOX 226, BOUND BROOK, NJ 08805-0226
PO BOX 227, BOUND BROOK, NJ 08805-0227
PO BOX 228, BOUND BROOK, NJ 08805-0228
PO BOX 229, BOUND BROOK, NJ 08805-0229
PO BOX 230, BOUND BROOK, NJ 08805-0230
PO BOX 231, BOUND BROOK, NJ 08805-0231
PO BOX 232, BOUND BROOK, NJ 08805-0232
PO BOX 233, BOUND BROOK, NJ 08805-0233
PO BOX 234, BOUND BROOK, NJ 08805-0234
PO BOX 235, BOUND BROOK, NJ 08805-0235
PO BOX 236, BOUND BROOK, NJ 08805-0236
PO BOX 237, BOUND BROOK, NJ 08805-0237
PO BOX 238, BOUND BROOK, NJ 08805-0238
PO BOX 239, BOUND BROOK, NJ 08805-0239
PO BOX 240, BOUND BROOK, NJ 08805-0240
PO BOX 241, BOUND BROOK, NJ 08805-0241
PO BOX 242, BOUND BROOK, NJ 08805-0242
PO BOX 243, BOUND BROOK, NJ 08805-0243
PO BOX 244, BOUND BROOK, NJ 08805-0244
PO BOX 245, BOUND BROOK, NJ 08805-0245
PO BOX 246, BOUND BROOK, NJ 08805-0246
PO BOX 247, BOUND BROOK, NJ 08805-0247
PO BOX 248, BOUND BROOK, NJ 08805-0248
PO BOX 249, BOUND BROOK, NJ 08805-0249
PO BOX 250, BOUND BROOK, NJ 08805-0250
PO BOX 251, BOUND BROOK, NJ 08805-0251
PO BOX 252, BOUND BROOK, NJ 08805-0252
PO BOX 253, BOUND BROOK, NJ 08805-0253
PO BOX 254, BOUND BROOK, NJ 08805-0254
PO BOX 255, BOUND BROOK, NJ 08805-0255
PO BOX 256, BOUND BROOK, NJ 08805-0256
PO BOX 257, BOUND BROOK, NJ 08805-0257
PO BOX 258, BOUND BROOK, NJ 08805-0258
PO BOX 259, BOUND BROOK, NJ 08805-0259
PO BOX 260, BOUND BROOK, NJ 08805-0260
PO BOX 261, BOUND BROOK, NJ 08805-0261
PO BOX 262, BOUND BROOK, NJ 08805-0262
PO BOX 263, BOUND BROOK, NJ 08805-0263
PO BOX 264, BOUND BROOK, NJ 08805-0264
PO BOX 265, BOUND BROOK, NJ 08805-0265
PO BOX 266, BOUND BROOK, NJ 08805-0266
PO BOX 267, BOUND BROOK, NJ 08805-0267
PO BOX 268, BOUND BROOK, NJ 08805-0268
PO BOX 269, BOUND BROOK, NJ 08805-0269
PO BOX 270, BOUND BROOK, NJ 08805-0270
PO BOX 271, BOUND BROOK, NJ 08805-0271
PO BOX 272, BOUND BROOK, NJ 08805-0272
PO BOX 273, BOUND BROOK, NJ 08805-0273
PO BOX 274, BOUND BROOK, NJ 08805-0274
PO BOX 275, BOUND BROOK, NJ 08805-0275
PO BOX 276, BOUND BROOK, NJ 08805-0276
PO BOX 277, BOUND BROOK, NJ 08805-0277
PO BOX 278, BOUND BROOK, NJ 08805-0278
PO BOX 279, BOUND BROOK, NJ 08805-0279
PO BOX 280, BOUND BROOK, NJ 08805-0280
PO BOX 281, BOUND BROOK, NJ 08805-0281
PO BOX 282, BOUND BROOK, NJ 08805-0282
PO BOX 283, BOUND BROOK, NJ 08805-0283
PO BOX 284, BOUND BROOK, NJ 08805-0284
PO BOX 285, BOUND BROOK, NJ 08805-0285
PO BOX 286, BOUND BROOK, NJ 08805-0286
PO BOX 287, BOUND BROOK, NJ 08805-0287
PO BOX 288, BOUND BROOK, NJ 08805-0288
PO BOX 289, BOUND BROOK, NJ 08805-0289
PO BOX 290, BOUND BROOK, NJ 08805-0290
PO BOX 291, BOUND BROOK, NJ 08805-0291
PO BOX 292, BOUND BROOK, NJ 08805-0292
PO BOX 293, BOUND BROOK, NJ 08805-0293
PO BOX 294, BOUND BROOK, NJ 08805-0294
PO BOX 295, BOUND BROOK, NJ 08805-0295
PO BOX 296, BOUND BROOK, NJ 08805-0296
PO BOX 297, BOUND BROOK, NJ 08805-0297
PO BOX 298, BOUND BROOK, NJ 08805-0298
PO BOX 299, BOUND BROOK, NJ 08805-0299
PO BOX 300, BOUND BROOK, NJ 08805-0300
PO BOX 301, BOUND BROOK, NJ 08805-0301
PO BOX 302, BOUND BROOK, NJ 08805-0302
PO BOX 303, BOUND BROOK, NJ 08805-0303
PO BOX 304, BOUND BROOK, NJ 08805-0304
PO BOX 305, BOUND BROOK, NJ 08805-0305
PO BOX 306, BOUND BROOK, NJ 08805-0306
PO BOX 307, BOUND BROOK, NJ 08805-0307
PO BOX 308, BOUND BROOK, NJ 08805-0308
PO BOX 309, BOUND BROOK, NJ 08805-0309
PO BOX 310, BOUND BROOK, NJ 08805-0310
PO BOX 311, BOUND BROOK, NJ 08805-0311
PO BOX 312, BOUND BROOK, NJ 08805-0312
PO BOX 313, BOUND BROOK, NJ 08805-0313
PO BOX 314, BOUND BROOK, NJ 08805-0314
PO BOX 315, BOUND BROOK, NJ 08805-0315
PO BOX 316, BOUND BROOK, NJ 08805-0316
PO BOX 317, BOUND BROOK, NJ 08805-0317
PO BOX 318, BOUND BROOK, NJ 08805-0318
PO BOX 319, BOUND BROOK, NJ 08805-0319
PO BOX 320, BOUND BROOK, NJ 08805-0320
PO BOX 321, BOUND BROOK, NJ 08805-0321
PO BOX 322, BOUND BROOK, NJ 08805-0322
PO BOX 323, BOUND BROOK, NJ 08805-0323
PO BOX 324, BOUND BROOK, NJ 08805-0324
PO BOX 325, BOUND BROOK, NJ 08805-0325
PO BOX 326, BOUND BROOK, NJ 08805-0326
PO BOX 327, BOUND BROOK, NJ 08805-0327
PO BOX 328, BOUND BROOK, NJ 08805-0328
PO BOX 329, BOUND BROOK, NJ 08805-0329
PO BOX 330, BOUND BROOK, NJ 08805-0330
PO BOX 331, BOUND BROOK, NJ 08805-0331
PO BOX 332, BOUND BROOK, NJ 08805-0332
PO BOX 333, BOUND BROOK, NJ 08805-0333
PO BOX 334, BOUND BROOK, NJ 08805-0334
PO BOX 335, BOUND BROOK, NJ 08805-0335
PO BOX 336, BOUND BROOK, NJ 08805-0336
PO BOX 337, BOUND BROOK, NJ 08805-0337
PO BOX 338, BOUND BROOK, NJ 08805-0338
PO BOX 339, BOUND BROOK, NJ 08805-0339
PO BOX 340, BOUND BROOK, NJ 08805-0340
PO BOX 341, BOUND BROOK, NJ 08805-0341
PO BOX 342, BOUND BROOK, NJ 08805-0342
PO BOX 343, BOUND BROOK, NJ 08805-0343
PO BOX 344, BOUND BROOK, NJ 08805-0344
PO BOX 345, BOUND BROOK, NJ 08805-0345
PO BOX 346, BOUND BROOK, NJ 08805-0346
PO BOX 347, BOUND BROOK, NJ 08805-0347
PO BOX 348, BOUND BROOK, NJ 08805-0348
PO BOX 349, BOUND BROOK, NJ 08805-0349
PO BOX 350, BOUND BROOK, NJ 08805-0350
PO BOX 351, BOUND BROOK, NJ 08805-0351
PO BOX 352, BOUND BROOK, NJ 08805-0352
PO BOX 353, BOUND BROOK, NJ 08805-0353
PO BOX 354, BOUND BROOK, NJ 08805-0354
PO BOX 355, BOUND BROOK, NJ 08805-0355
PO BOX 356, BOUND BROOK, NJ 08805-0356
PO BOX 357, BOUND BROOK, NJ 08805-0357
PO BOX 358, BOUND BROOK, NJ 08805-0358
PO BOX 359, BOUND BROOK, NJ 08805-0359
PO BOX 360, BOUND BROOK, NJ 08805-0360
PO BOX 361, BOUND BROOK, NJ 08805-0361
PO BOX 362, BOUND BROOK, NJ 08805-0362
PO BOX 363, BOUND BROOK, NJ 08805-0363
PO BOX 364, BOUND BROOK, NJ 08805-0364
PO BOX 365, BOUND BROOK, NJ 08805-0365
PO BOX 366, BOUND BROOK, NJ 08805-0366
PO BOX 367, BOUND BROOK, NJ 08805-0367
PO BOX 368, BOUND BROOK, NJ 08805-0368
PO BOX 369, BOUND BROOK, NJ 08805-0369
PO BOX 370, BOUND BROOK, NJ 08805-0370
PO BOX 371, BOUND BROOK, NJ 08805-0371
PO BOX 372, BOUND BROOK, NJ 08805-0372
PO BOX 373, BOUND BROOK, NJ 08805-0373
PO BOX 374, BOUND BROOK, NJ 08805-0374
PO BOX 375, BOUND BROOK, NJ 08805-0375
PO BOX 376, BOUND BROOK, NJ 08805-0376
PO BOX 377, BOUND BROOK, NJ 08805-0377
PO BOX 378, BOUND BROOK, NJ 08805-0378
PO BOX 379, BOUND BROOK, NJ 08805-0379
PO BOX 380, BOUND BROOK, NJ 08805-0380
PO BOX 381, BOUND BROOK, NJ 08805-0381
PO BOX 382, BOUND BROOK, NJ 08805-0382
PO BOX 383, BOUND BROOK, NJ 08805-0383
PO BOX 384, BOUND BROOK, NJ 08805-0384
PO BOX 385, BOUND BROOK, NJ 08805-0385
PO BOX 386, BOUND BROOK, NJ 08805-0386
PO BOX 387, BOUND BROOK, NJ 08805-0387
PO BOX 388, BOUND BROOK, NJ 08805-0388
PO BOX 389, BOUND BROOK, NJ 08805-0389
PO BOX 390, BOUND BROOK, NJ 08805-0390
PO BOX 391, BOUND BROOK, NJ 08805-0391
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