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 241, NORTHPORT, WA 99157-0241
PO BOX 242, NORTHPORT, WA 99157-0242
PO BOX 243, NORTHPORT, WA 99157-0243
PO BOX 244, NORTHPORT, WA 99157-0244
PO BOX 245, NORTHPORT, WA 99157-0245
PO BOX 246, NORTHPORT, WA 99157-0246
PO BOX 247, NORTHPORT, WA 99157-0247
PO BOX 248, NORTHPORT, WA 99157-0248
PO BOX 249, NORTHPORT, WA 99157-0249
PO BOX 250, NORTHPORT, WA 99157-0250
PO BOX 251, NORTHPORT, WA 99157-0251
PO BOX 252, NORTHPORT, WA 99157-0252
PO BOX 253, NORTHPORT, WA 99157-0253
PO BOX 254, NORTHPORT, WA 99157-0254
PO BOX 255, NORTHPORT, WA 99157-0255
PO BOX 256, NORTHPORT, WA 99157-0256
PO BOX 257, NORTHPORT, WA 99157-0257
PO BOX 258, NORTHPORT, WA 99157-0258
PO BOX 259, NORTHPORT, WA 99157-0259
PO BOX 260, NORTHPORT, WA 99157-0260
PO BOX 261, NORTHPORT, WA 99157-0261
PO BOX 262, NORTHPORT, WA 99157-0262
PO BOX 263, NORTHPORT, WA 99157-0263
PO BOX 264, NORTHPORT, WA 99157-0264
PO BOX 265, NORTHPORT, WA 99157-0265
PO BOX 266, NORTHPORT, WA 99157-0266
PO BOX 267, NORTHPORT, WA 99157-0267
PO BOX 268, NORTHPORT, WA 99157-0268
PO BOX 269, NORTHPORT, WA 99157-0269
PO BOX 270, NORTHPORT, WA 99157-0270
PO BOX 271, NORTHPORT, WA 99157-0271
PO BOX 272, NORTHPORT, WA 99157-0272
PO BOX 273, NORTHPORT, WA 99157-0273
PO BOX 274, NORTHPORT, WA 99157-0274
PO BOX 275, NORTHPORT, WA 99157-0275
PO BOX 276, NORTHPORT, WA 99157-0276
PO BOX 277, NORTHPORT, WA 99157-0277
PO BOX 278, NORTHPORT, WA 99157-0278
PO BOX 279, NORTHPORT, WA 99157-0279
PO BOX 280, NORTHPORT, WA 99157-0280
PO BOX 281, NORTHPORT, WA 99157-0281
PO BOX 282, NORTHPORT, WA 99157-0282
PO BOX 283, NORTHPORT, WA 99157-0283
PO BOX 284, NORTHPORT, WA 99157-0284
PO BOX 285, NORTHPORT, WA 99157-0285
PO BOX 286, NORTHPORT, WA 99157-0286
PO BOX 287, NORTHPORT, WA 99157-0287
PO BOX 288, NORTHPORT, WA 99157-0288
PO BOX 289, NORTHPORT, WA 99157-0289
PO BOX 290, NORTHPORT, WA 99157-0290
PO BOX 291, NORTHPORT, WA 99157-0291
PO BOX 292, NORTHPORT, WA 99157-0292
PO BOX 293, NORTHPORT, WA 99157-0293
PO BOX 294, NORTHPORT, WA 99157-0294
PO BOX 295, NORTHPORT, WA 99157-0295
PO BOX 296, NORTHPORT, WA 99157-0296
PO BOX 297, NORTHPORT, WA 99157-0297
PO BOX 298, NORTHPORT, WA 99157-0298
PO BOX 299, NORTHPORT, WA 99157-0299
PO BOX 300, NORTHPORT, WA 99157-0300
PO BOX 301, NORTHPORT, WA 99157-0301
PO BOX 302, NORTHPORT, WA 99157-0302
PO BOX 303, NORTHPORT, WA 99157-0303
PO BOX 304, NORTHPORT, WA 99157-0304
PO BOX 305, NORTHPORT, WA 99157-0305
PO BOX 306, NORTHPORT, WA 99157-0306
PO BOX 307, NORTHPORT, WA 99157-0307
PO BOX 308, NORTHPORT, WA 99157-0308
PO BOX 309, NORTHPORT, WA 99157-0309
PO BOX 310, NORTHPORT, WA 99157-0310
PO BOX 311, NORTHPORT, WA 99157-0311
PO BOX 312, NORTHPORT, WA 99157-0312
PO BOX 313, NORTHPORT, WA 99157-0313
PO BOX 314, NORTHPORT, WA 99157-0314
PO BOX 315, NORTHPORT, WA 99157-0315
PO BOX 316, NORTHPORT, WA 99157-0316
PO BOX 317, NORTHPORT, WA 99157-0317
PO BOX 318, NORTHPORT, WA 99157-0318
PO BOX 319, NORTHPORT, WA 99157-0319
PO BOX 320, NORTHPORT, WA 99157-0320
PO BOX 321, NORTHPORT, WA 99157-0321
PO BOX 322, NORTHPORT, WA 99157-0322
PO BOX 323, NORTHPORT, WA 99157-0323
PO BOX 324, NORTHPORT, WA 99157-0324
PO BOX 325, NORTHPORT, WA 99157-0325
PO BOX 326, NORTHPORT, WA 99157-0326
PO BOX 327, NORTHPORT, WA 99157-0327
PO BOX 328, NORTHPORT, WA 99157-0328
PO BOX 329, NORTHPORT, WA 99157-0329
PO BOX 330, NORTHPORT, WA 99157-0330
PO BOX 331, NORTHPORT, WA 99157-0331
PO BOX 332, NORTHPORT, WA 99157-0332
PO BOX 333, NORTHPORT, WA 99157-0333
PO BOX 334, NORTHPORT, WA 99157-0334
PO BOX 335, NORTHPORT, WA 99157-0335
PO BOX 336, NORTHPORT, WA 99157-0336
PO BOX 337, NORTHPORT, WA 99157-0337
PO BOX 338, NORTHPORT, WA 99157-0338
PO BOX 339, NORTHPORT, WA 99157-0339
PO BOX 340, NORTHPORT, WA 99157-0340
PO BOX 341, NORTHPORT, WA 99157-0341
PO BOX 342, NORTHPORT, WA 99157-0342
PO BOX 343, NORTHPORT, WA 99157-0343
PO BOX 344, NORTHPORT, WA 99157-0344
PO BOX 345, NORTHPORT, WA 99157-0345
PO BOX 346, NORTHPORT, WA 99157-0346
PO BOX 347, NORTHPORT, WA 99157-0347
PO BOX 348, NORTHPORT, WA 99157-0348
PO BOX 349, NORTHPORT, WA 99157-0349
PO BOX 350, NORTHPORT, WA 99157-0350
PO BOX 351, NORTHPORT, WA 99157-0351
PO BOX 352, NORTHPORT, WA 99157-0352
PO BOX 353, NORTHPORT, WA 99157-0353
PO BOX 354, NORTHPORT, WA 99157-0354
PO BOX 355, NORTHPORT, WA 99157-0355
PO BOX 356, NORTHPORT, WA 99157-0356
PO BOX 357, NORTHPORT, WA 99157-0357
PO BOX 358, NORTHPORT, WA 99157-0358
PO BOX 359, NORTHPORT, WA 99157-0359
PO BOX 360, NORTHPORT, WA 99157-0360
PO BOX 361, NORTHPORT, WA 99157-0361
PO BOX 362, NORTHPORT, WA 99157-0362
PO BOX 363, NORTHPORT, WA 99157-0363
PO BOX 364, NORTHPORT, WA 99157-0364
PO BOX 365, NORTHPORT, WA 99157-0365
PO BOX 366, NORTHPORT, WA 99157-0366
PO BOX 367, NORTHPORT, WA 99157-0367
PO BOX 368, NORTHPORT, WA 99157-0368
PO BOX 369, NORTHPORT, WA 99157-0369
PO BOX 370, NORTHPORT, WA 99157-0370
PO BOX 371, NORTHPORT, WA 99157-0371
PO BOX 372, NORTHPORT, WA 99157-0372
PO BOX 373, NORTHPORT, WA 99157-0373
PO BOX 374, NORTHPORT, WA 99157-0374
PO BOX 375, NORTHPORT, WA 99157-0375
PO BOX 376, NORTHPORT, WA 99157-0376
PO BOX 377, NORTHPORT, WA 99157-0377
PO BOX 378, NORTHPORT, WA 99157-0378
PO BOX 379, NORTHPORT, WA 99157-0379
PO BOX 380, NORTHPORT, WA 99157-0380
PO BOX 381, NORTHPORT, WA 99157-0381
PO BOX 382, NORTHPORT, WA 99157-0382
PO BOX 383, NORTHPORT, WA 99157-0383
PO BOX 384, NORTHPORT, WA 99157-0384
PO BOX 385, NORTHPORT, WA 99157-0385
PO BOX 386, NORTHPORT, WA 99157-0386
PO BOX 387, NORTHPORT, WA 99157-0387
PO BOX 388, NORTHPORT, WA 99157-0388
PO BOX 389, NORTHPORT, WA 99157-0389
PO BOX 390, NORTHPORT, WA 99157-0390
PO BOX 391, NORTHPORT, WA 99157-0391
PO BOX 392, NORTHPORT, WA 99157-0392
PO BOX 393, NORTHPORT, WA 99157-0393
PO BOX 394, NORTHPORT, WA 99157-0394
PO BOX 395, NORTHPORT, WA 99157-0395
PO BOX 396, NORTHPORT, WA 99157-0396
PO BOX 397, NORTHPORT, WA 99157-0397
PO BOX 398, NORTHPORT, WA 99157-0398
PO BOX 399, NORTHPORT, WA 99157-0399
PO BOX 400, NORTHPORT, WA 99157-0400
PO BOX 401, NORTHPORT, WA 99157-0401
PO BOX 402, NORTHPORT, WA 99157-0402
PO BOX 403, NORTHPORT, WA 99157-0403
PO BOX 404, NORTHPORT, WA 99157-0404
PO BOX 405, NORTHPORT, WA 99157-0405
PO BOX 406, NORTHPORT, WA 99157-0406
PO BOX 407, NORTHPORT, WA 99157-0407
PO BOX 408, NORTHPORT, WA 99157-0408
PO BOX 409, NORTHPORT, WA 99157-0409
PO BOX 410, NORTHPORT, WA 99157-0410
PO BOX 411, NORTHPORT, WA 99157-0411
PO BOX 412, NORTHPORT, WA 99157-0412
PO BOX 413, NORTHPORT, WA 99157-0413
PO BOX 414, NORTHPORT, WA 99157-0414
PO BOX 415, NORTHPORT, WA 99157-0415
PO BOX 416, NORTHPORT, WA 99157-0416
PO BOX 417, NORTHPORT, WA 99157-0417
PO BOX 418, NORTHPORT, WA 99157-0418
PO BOX 419, NORTHPORT, WA 99157-0419
PO BOX 420, NORTHPORT, WA 99157-0420
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