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, SALINA, OK 74365-0241
PO BOX 242, SALINA, OK 74365-0242
PO BOX 243, SALINA, OK 74365-0243
PO BOX 244, SALINA, OK 74365-0244
PO BOX 245, SALINA, OK 74365-0245
PO BOX 246, SALINA, OK 74365-0246
PO BOX 247, SALINA, OK 74365-0247
PO BOX 248, SALINA, OK 74365-0248
PO BOX 249, SALINA, OK 74365-0249
PO BOX 250, SALINA, OK 74365-0250
PO BOX 251, SALINA, OK 74365-0251
PO BOX 252, SALINA, OK 74365-0252
PO BOX 253, SALINA, OK 74365-0253
PO BOX 254, SALINA, OK 74365-0254
PO BOX 255, SALINA, OK 74365-0255
PO BOX 256, SALINA, OK 74365-0256
PO BOX 257, SALINA, OK 74365-0257
PO BOX 258, SALINA, OK 74365-0258
PO BOX 259, SALINA, OK 74365-0259
PO BOX 260, SALINA, OK 74365-0260
PO BOX 261, SALINA, OK 74365-0261
PO BOX 262, SALINA, OK 74365-0262
PO BOX 263, SALINA, OK 74365-0263
PO BOX 264, SALINA, OK 74365-0264
PO BOX 265, SALINA, OK 74365-0265
PO BOX 266, SALINA, OK 74365-0266
PO BOX 267, SALINA, OK 74365-0267
PO BOX 268, SALINA, OK 74365-0268
PO BOX 269, SALINA, OK 74365-0269
PO BOX 270, SALINA, OK 74365-0270
PO BOX 271, SALINA, OK 74365-0271
PO BOX 272, SALINA, OK 74365-0272
PO BOX 273, SALINA, OK 74365-0273
PO BOX 274, SALINA, OK 74365-0274
PO BOX 275, SALINA, OK 74365-0275
PO BOX 276, SALINA, OK 74365-0276
PO BOX 277, SALINA, OK 74365-0277
PO BOX 278, SALINA, OK 74365-0278
PO BOX 279, SALINA, OK 74365-0279
PO BOX 280, SALINA, OK 74365-0280
PO BOX 281, SALINA, OK 74365-0281
PO BOX 282, SALINA, OK 74365-0282
PO BOX 283, SALINA, OK 74365-0283
PO BOX 284, SALINA, OK 74365-0284
PO BOX 285, SALINA, OK 74365-0285
PO BOX 286, SALINA, OK 74365-0286
PO BOX 287, SALINA, OK 74365-0287
PO BOX 288, SALINA, OK 74365-0288
PO BOX 289, SALINA, OK 74365-0289
PO BOX 290, SALINA, OK 74365-0290
PO BOX 291, SALINA, OK 74365-0291
PO BOX 292, SALINA, OK 74365-0292
PO BOX 293, SALINA, OK 74365-0293
PO BOX 294, SALINA, OK 74365-0294
PO BOX 295, SALINA, OK 74365-0295
PO BOX 296, SALINA, OK 74365-0296
PO BOX 297, SALINA, OK 74365-0297
PO BOX 298, SALINA, OK 74365-0298
PO BOX 299, SALINA, OK 74365-0299
PO BOX 300, SALINA, OK 74365-0300
PO BOX 301, SALINA, OK 74365-0301
PO BOX 302, SALINA, OK 74365-0302
PO BOX 303, SALINA, OK 74365-0303
PO BOX 304, SALINA, OK 74365-0304
PO BOX 305, SALINA, OK 74365-0305
PO BOX 306, SALINA, OK 74365-0306
PO BOX 307, SALINA, OK 74365-0307
PO BOX 308, SALINA, OK 74365-0308
PO BOX 309, SALINA, OK 74365-0309
PO BOX 310, SALINA, OK 74365-0310
PO BOX 311, SALINA, OK 74365-0311
PO BOX 312, SALINA, OK 74365-0312
PO BOX 313, SALINA, OK 74365-0313
PO BOX 314, SALINA, OK 74365-0314
PO BOX 315, SALINA, OK 74365-0315
PO BOX 316, SALINA, OK 74365-0316
PO BOX 317, SALINA, OK 74365-0317
PO BOX 318, SALINA, OK 74365-0318
PO BOX 319, SALINA, OK 74365-0319
PO BOX 320, SALINA, OK 74365-0320
PO BOX 321, SALINA, OK 74365-0321
PO BOX 322, SALINA, OK 74365-0322
PO BOX 323, SALINA, OK 74365-0323
PO BOX 324, SALINA, OK 74365-0324
PO BOX 325, SALINA, OK 74365-0325
PO BOX 326, SALINA, OK 74365-0326
PO BOX 327, SALINA, OK 74365-0327
PO BOX 328, SALINA, OK 74365-0328
PO BOX 329, SALINA, OK 74365-0329
PO BOX 330, SALINA, OK 74365-0330
PO BOX 331, SALINA, OK 74365-0331
PO BOX 332, SALINA, OK 74365-0332
PO BOX 333, SALINA, OK 74365-0333
PO BOX 334, SALINA, OK 74365-0334
PO BOX 335, SALINA, OK 74365-0335
PO BOX 336, SALINA, OK 74365-0336
PO BOX 337, SALINA, OK 74365-0337
PO BOX 338, SALINA, OK 74365-0338
PO BOX 339, SALINA, OK 74365-0339
PO BOX 340, SALINA, OK 74365-0340
PO BOX 341, SALINA, OK 74365-0341
PO BOX 342, SALINA, OK 74365-0342
PO BOX 343, SALINA, OK 74365-0343
PO BOX 344, SALINA, OK 74365-0344
PO BOX 345, SALINA, OK 74365-0345
PO BOX 346, SALINA, OK 74365-0346
PO BOX 347, SALINA, OK 74365-0347
PO BOX 348, SALINA, OK 74365-0348
PO BOX 349, SALINA, OK 74365-0349
PO BOX 350, SALINA, OK 74365-0350
PO BOX 351, SALINA, OK 74365-0351
PO BOX 352, SALINA, OK 74365-0352
PO BOX 353, SALINA, OK 74365-0353
PO BOX 354, SALINA, OK 74365-0354
PO BOX 355, SALINA, OK 74365-0355
PO BOX 356, SALINA, OK 74365-0356
PO BOX 357, SALINA, OK 74365-0357
PO BOX 358, SALINA, OK 74365-0358
PO BOX 359, SALINA, OK 74365-0359
PO BOX 360, SALINA, OK 74365-0360
PO BOX 361, SALINA, OK 74365-0361
PO BOX 362, SALINA, OK 74365-0362
PO BOX 363, SALINA, OK 74365-0363
PO BOX 364, SALINA, OK 74365-0364
PO BOX 365, SALINA, OK 74365-0365
PO BOX 366, SALINA, OK 74365-0366
PO BOX 367, SALINA, OK 74365-0367
PO BOX 368, SALINA, OK 74365-0368
PO BOX 369, SALINA, OK 74365-0369
PO BOX 370, SALINA, OK 74365-0370
PO BOX 371, SALINA, OK 74365-0371
PO BOX 372, SALINA, OK 74365-0372
PO BOX 373, SALINA, OK 74365-0373
PO BOX 374, SALINA, OK 74365-0374
PO BOX 375, SALINA, OK 74365-0375
PO BOX 376, SALINA, OK 74365-0376
PO BOX 377, SALINA, OK 74365-0377
PO BOX 378, SALINA, OK 74365-0378
PO BOX 379, SALINA, OK 74365-0379
PO BOX 380, SALINA, OK 74365-0380
PO BOX 381, SALINA, OK 74365-0381
PO BOX 382, SALINA, OK 74365-0382
PO BOX 383, SALINA, OK 74365-0383
PO BOX 384, SALINA, OK 74365-0384
PO BOX 385, SALINA, OK 74365-0385
PO BOX 386, SALINA, OK 74365-0386
PO BOX 387, SALINA, OK 74365-0387
PO BOX 388, SALINA, OK 74365-0388
PO BOX 389, SALINA, OK 74365-0389
PO BOX 390, SALINA, OK 74365-0390
PO BOX 391, SALINA, OK 74365-0391
PO BOX 392, SALINA, OK 74365-0392
PO BOX 393, SALINA, OK 74365-0393
PO BOX 394, SALINA, OK 74365-0394
PO BOX 395, SALINA, OK 74365-0395
PO BOX 396, SALINA, OK 74365-0396
PO BOX 397, SALINA, OK 74365-0397
PO BOX 398, SALINA, OK 74365-0398
PO BOX 399, SALINA, OK 74365-0399
PO BOX 400, SALINA, OK 74365-0400
PO BOX 401, SALINA, OK 74365-0401
PO BOX 402, SALINA, OK 74365-0402
PO BOX 403, SALINA, OK 74365-0403
PO BOX 404, SALINA, OK 74365-0404
PO BOX 405, SALINA, OK 74365-0405
PO BOX 406, SALINA, OK 74365-0406
PO BOX 407, SALINA, OK 74365-0407
PO BOX 408, SALINA, OK 74365-0408
PO BOX 409, SALINA, OK 74365-0409
PO BOX 410, SALINA, OK 74365-0410
PO BOX 411, SALINA, OK 74365-0411
PO BOX 412, SALINA, OK 74365-0412
PO BOX 413, SALINA, OK 74365-0413
PO BOX 414, SALINA, OK 74365-0414
PO BOX 415, SALINA, OK 74365-0415
PO BOX 416, SALINA, OK 74365-0416
PO BOX 417, SALINA, OK 74365-0417
PO BOX 418, SALINA, OK 74365-0418
PO BOX 419, SALINA, OK 74365-0419
PO BOX 420, SALINA, OK 74365-0420
PO BOX 421, SALINA, OK 74365-0421
PO BOX 422, SALINA, OK 74365-0422
PO BOX 423, SALINA, OK 74365-0423
PO BOX 424, SALINA, OK 74365-0424
PO BOX 425, SALINA, OK 74365-0425
PO BOX 426, SALINA, OK 74365-0426
PO BOX 427, SALINA, OK 74365-0427
PO BOX 428, SALINA, OK 74365-0428
PO BOX 429, SALINA, OK 74365-0429
PO BOX 430, SALINA, OK 74365-0430
PO BOX 431, SALINA, OK 74365-0431
PO BOX 432, SALINA, OK 74365-0432
PO BOX 433, SALINA, OK 74365-0433
PO BOX 434, SALINA, OK 74365-0434
PO BOX 435, SALINA, OK 74365-0435
PO BOX 436, SALINA, OK 74365-0436
PO BOX 437, SALINA, OK 74365-0437
PO BOX 438, SALINA, OK 74365-0438
PO BOX 439, SALINA, OK 74365-0439
PO BOX 440, SALINA, OK 74365-0440
PO BOX 441, SALINA, OK 74365-0441
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