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, IMPERIAL BEACH, CA 91933-0241
PO BOX 242, IMPERIAL BEACH, CA 91933-0242
PO BOX 243, IMPERIAL BEACH, CA 91933-0243
PO BOX 244, IMPERIAL BEACH, CA 91933-0244
PO BOX 245, IMPERIAL BEACH, CA 91933-0245
PO BOX 246, IMPERIAL BEACH, CA 91933-0246
PO BOX 247, IMPERIAL BEACH, CA 91933-0247
PO BOX 248, IMPERIAL BEACH, CA 91933-0248
PO BOX 249, IMPERIAL BEACH, CA 91933-0249
PO BOX 250, IMPERIAL BEACH, CA 91933-0250
PO BOX 251, IMPERIAL BEACH, CA 91933-0251
PO BOX 252, IMPERIAL BEACH, CA 91933-0252
PO BOX 253, IMPERIAL BEACH, CA 91933-0253
PO BOX 254, IMPERIAL BEACH, CA 91933-0254
PO BOX 255, IMPERIAL BEACH, CA 91933-0255
PO BOX 256, IMPERIAL BEACH, CA 91933-0256
PO BOX 257, IMPERIAL BEACH, CA 91933-0257
PO BOX 258, IMPERIAL BEACH, CA 91933-0258
PO BOX 259, IMPERIAL BEACH, CA 91933-0259
PO BOX 260, IMPERIAL BEACH, CA 91933-0260
PO BOX 261, IMPERIAL BEACH, CA 91933-0261
PO BOX 262, IMPERIAL BEACH, CA 91933-0262
PO BOX 263, IMPERIAL BEACH, CA 91933-0263
PO BOX 264, IMPERIAL BEACH, CA 91933-0264
PO BOX 265, IMPERIAL BEACH, CA 91933-0265
PO BOX 266, IMPERIAL BEACH, CA 91933-0266
PO BOX 267, IMPERIAL BEACH, CA 91933-0267
PO BOX 268, IMPERIAL BEACH, CA 91933-0268
PO BOX 269, IMPERIAL BEACH, CA 91933-0269
PO BOX 270, IMPERIAL BEACH, CA 91933-0270
PO BOX 271, IMPERIAL BEACH, CA 91933-0271
PO BOX 272, IMPERIAL BEACH, CA 91933-0272
PO BOX 273, IMPERIAL BEACH, CA 91933-0273
PO BOX 274, IMPERIAL BEACH, CA 91933-0274
PO BOX 275, IMPERIAL BEACH, CA 91933-0275
PO BOX 276, IMPERIAL BEACH, CA 91933-0276
PO BOX 277, IMPERIAL BEACH, CA 91933-0277
PO BOX 278, IMPERIAL BEACH, CA 91933-0278
PO BOX 279, IMPERIAL BEACH, CA 91933-0279
PO BOX 280, IMPERIAL BEACH, CA 91933-0280
PO BOX 281, IMPERIAL BEACH, CA 91933-0281
PO BOX 282, IMPERIAL BEACH, CA 91933-0282
PO BOX 283, IMPERIAL BEACH, CA 91933-0283
PO BOX 284, IMPERIAL BEACH, CA 91933-0284
PO BOX 285, IMPERIAL BEACH, CA 91933-0285
PO BOX 286, IMPERIAL BEACH, CA 91933-0286
PO BOX 287, IMPERIAL BEACH, CA 91933-0287
PO BOX 288, IMPERIAL BEACH, CA 91933-0288
PO BOX 289, IMPERIAL BEACH, CA 91933-0289
PO BOX 290, IMPERIAL BEACH, CA 91933-0290
PO BOX 291, IMPERIAL BEACH, CA 91933-0291
PO BOX 292, IMPERIAL BEACH, CA 91933-0292
PO BOX 293, IMPERIAL BEACH, CA 91933-0293
PO BOX 294, IMPERIAL BEACH, CA 91933-0294
PO BOX 295, IMPERIAL BEACH, CA 91933-0295
PO BOX 296, IMPERIAL BEACH, CA 91933-0296
PO BOX 297, IMPERIAL BEACH, CA 91933-0297
PO BOX 298, IMPERIAL BEACH, CA 91933-0298
PO BOX 299, IMPERIAL BEACH, CA 91933-0299
PO BOX 300, IMPERIAL BEACH, CA 91933-0300
PO BOX 301, IMPERIAL BEACH, CA 91933-0301
PO BOX 302, IMPERIAL BEACH, CA 91933-0302
PO BOX 303, IMPERIAL BEACH, CA 91933-0303
PO BOX 304, IMPERIAL BEACH, CA 91933-0304
PO BOX 305, IMPERIAL BEACH, CA 91933-0305
PO BOX 306, IMPERIAL BEACH, CA 91933-0306
PO BOX 307, IMPERIAL BEACH, CA 91933-0307
PO BOX 308, IMPERIAL BEACH, CA 91933-0308
PO BOX 309, IMPERIAL BEACH, CA 91933-0309
PO BOX 310, IMPERIAL BEACH, CA 91933-0310
PO BOX 311, IMPERIAL BEACH, CA 91933-0311
PO BOX 312, IMPERIAL BEACH, CA 91933-0312
PO BOX 313, IMPERIAL BEACH, CA 91933-0313
PO BOX 314, IMPERIAL BEACH, CA 91933-0314
PO BOX 315, IMPERIAL BEACH, CA 91933-0315
PO BOX 316, IMPERIAL BEACH, CA 91933-0316
PO BOX 317, IMPERIAL BEACH, CA 91933-0317
PO BOX 318, IMPERIAL BEACH, CA 91933-0318
PO BOX 319, IMPERIAL BEACH, CA 91933-0319
PO BOX 320, IMPERIAL BEACH, CA 91933-0320
PO BOX 321, IMPERIAL BEACH, CA 91933-0321
PO BOX 322, IMPERIAL BEACH, CA 91933-0322
PO BOX 323, IMPERIAL BEACH, CA 91933-0323
PO BOX 324, IMPERIAL BEACH, CA 91933-0324
PO BOX 325, IMPERIAL BEACH, CA 91933-0325
PO BOX 326, IMPERIAL BEACH, CA 91933-0326
PO BOX 327, IMPERIAL BEACH, CA 91933-0327
PO BOX 328, IMPERIAL BEACH, CA 91933-0328
PO BOX 329, IMPERIAL BEACH, CA 91933-0329
PO BOX 330, IMPERIAL BEACH, CA 91933-0330
PO BOX 331, IMPERIAL BEACH, CA 91933-0331
PO BOX 332, IMPERIAL BEACH, CA 91933-0332
PO BOX 333, IMPERIAL BEACH, CA 91933-0333
PO BOX 334, IMPERIAL BEACH, CA 91933-0334
PO BOX 335, IMPERIAL BEACH, CA 91933-0335
PO BOX 336, IMPERIAL BEACH, CA 91933-0336
PO BOX 337, IMPERIAL BEACH, CA 91933-0337
PO BOX 338, IMPERIAL BEACH, CA 91933-0338
PO BOX 339, IMPERIAL BEACH, CA 91933-0339
PO BOX 340, IMPERIAL BEACH, CA 91933-0340
PO BOX 341, IMPERIAL BEACH, CA 91933-0341
PO BOX 342, IMPERIAL BEACH, CA 91933-0342
PO BOX 343, IMPERIAL BEACH, CA 91933-0343
PO BOX 344, IMPERIAL BEACH, CA 91933-0344
PO BOX 345, IMPERIAL BEACH, CA 91933-0345
PO BOX 346, IMPERIAL BEACH, CA 91933-0346
PO BOX 347, IMPERIAL BEACH, CA 91933-0347
PO BOX 348, IMPERIAL BEACH, CA 91933-0348
PO BOX 349, IMPERIAL BEACH, CA 91933-0349
PO BOX 350, IMPERIAL BEACH, CA 91933-0350
PO BOX 351, IMPERIAL BEACH, CA 91933-0351
PO BOX 352, IMPERIAL BEACH, CA 91933-0352
PO BOX 353, IMPERIAL BEACH, CA 91933-0353
PO BOX 354, IMPERIAL BEACH, CA 91933-0354
PO BOX 355, IMPERIAL BEACH, CA 91933-0355
PO BOX 356, IMPERIAL BEACH, CA 91933-0356
PO BOX 357, IMPERIAL BEACH, CA 91933-0357
PO BOX 358, IMPERIAL BEACH, CA 91933-0358
PO BOX 359, IMPERIAL BEACH, CA 91933-0359
PO BOX 360, IMPERIAL BEACH, CA 91933-0360
PO BOX 361, IMPERIAL BEACH, CA 91933-0361
PO BOX 362, IMPERIAL BEACH, CA 91933-0362
PO BOX 363, IMPERIAL BEACH, CA 91933-0363
PO BOX 364, IMPERIAL BEACH, CA 91933-0364
PO BOX 365, IMPERIAL BEACH, CA 91933-0365
PO BOX 366, IMPERIAL BEACH, CA 91933-0366
PO BOX 367, IMPERIAL BEACH, CA 91933-0367
PO BOX 368, IMPERIAL BEACH, CA 91933-0368
PO BOX 369, IMPERIAL BEACH, CA 91933-0369
PO BOX 370, IMPERIAL BEACH, CA 91933-0370
PO BOX 371, IMPERIAL BEACH, CA 91933-0371
PO BOX 372, IMPERIAL BEACH, CA 91933-0372
PO BOX 373, IMPERIAL BEACH, CA 91933-0373
PO BOX 374, IMPERIAL BEACH, CA 91933-0374
PO BOX 375, IMPERIAL BEACH, CA 91933-0375
PO BOX 376, IMPERIAL BEACH, CA 91933-0376
PO BOX 377, IMPERIAL BEACH, CA 91933-0377
PO BOX 378, IMPERIAL BEACH, CA 91933-0378
PO BOX 379, IMPERIAL BEACH, CA 91933-0379
PO BOX 380, IMPERIAL BEACH, CA 91933-0380
PO BOX 381, IMPERIAL BEACH, CA 91933-0381
PO BOX 382, IMPERIAL BEACH, CA 91933-0382
PO BOX 383, IMPERIAL BEACH, CA 91933-0383
PO BOX 384, IMPERIAL BEACH, CA 91933-0384
PO BOX 385, IMPERIAL BEACH, CA 91933-0385
PO BOX 386, IMPERIAL BEACH, CA 91933-0386
PO BOX 387, IMPERIAL BEACH, CA 91933-0387
PO BOX 388, IMPERIAL BEACH, CA 91933-0388
PO BOX 389, IMPERIAL BEACH, CA 91933-0389
PO BOX 390, IMPERIAL BEACH, CA 91933-0390
PO BOX 391, IMPERIAL BEACH, CA 91933-0391
PO BOX 392, IMPERIAL BEACH, CA 91933-0392
PO BOX 393, IMPERIAL BEACH, CA 91933-0393
PO BOX 394, IMPERIAL BEACH, CA 91933-0394
PO BOX 395, IMPERIAL BEACH, CA 91933-0395
PO BOX 396, IMPERIAL BEACH, CA 91933-0396
PO BOX 397, IMPERIAL BEACH, CA 91933-0397
PO BOX 398, IMPERIAL BEACH, CA 91933-0398
PO BOX 399, IMPERIAL BEACH, CA 91933-0399
PO BOX 400, IMPERIAL BEACH, CA 91933-0400
PO BOX 401, IMPERIAL BEACH, CA 91933-0401
PO BOX 402, IMPERIAL BEACH, CA 91933-0402
PO BOX 403, IMPERIAL BEACH, CA 91933-0403
PO BOX 404, IMPERIAL BEACH, CA 91933-0404
PO BOX 405, IMPERIAL BEACH, CA 91933-0405
PO BOX 406, IMPERIAL BEACH, CA 91933-0406
PO BOX 407, IMPERIAL BEACH, CA 91933-0407
PO BOX 408, IMPERIAL BEACH, CA 91933-0408
PO BOX 409, IMPERIAL BEACH, CA 91933-0409
PO BOX 410, IMPERIAL BEACH, CA 91933-0410
PO BOX 411, IMPERIAL BEACH, CA 91933-0411
PO BOX 412, IMPERIAL BEACH, CA 91933-0412
PO BOX 413, IMPERIAL BEACH, CA 91933-0413
PO BOX 414, IMPERIAL BEACH, CA 91933-0414
PO BOX 415, IMPERIAL BEACH, CA 91933-0415
PO BOX 416, IMPERIAL BEACH, CA 91933-0416
PO BOX 417, IMPERIAL BEACH, CA 91933-0417
PO BOX 418, IMPERIAL BEACH, CA 91933-0418
PO BOX 419, IMPERIAL BEACH, CA 91933-0419
PO BOX 420, IMPERIAL BEACH, CA 91933-0420
PO BOX 421, IMPERIAL BEACH, CA 91933-0421
PO BOX 422, IMPERIAL BEACH, CA 91933-0422
PO BOX 423, IMPERIAL BEACH, CA 91933-0423
PO BOX 424, IMPERIAL BEACH, CA 91933-0424
PO BOX 425, IMPERIAL BEACH, CA 91933-0425
PO BOX 426, IMPERIAL BEACH, CA 91933-0426
PO BOX 427, IMPERIAL BEACH, CA 91933-0427
PO BOX 428, IMPERIAL BEACH, CA 91933-0428
PO BOX 429, IMPERIAL BEACH, CA 91933-0429
PO BOX 430, IMPERIAL BEACH, CA 91933-0430
PO BOX 431, IMPERIAL BEACH, CA 91933-0431
PO BOX 432, IMPERIAL BEACH, CA 91933-0432
PO BOX 433, IMPERIAL BEACH, CA 91933-0433
PO BOX 434, IMPERIAL BEACH, CA 91933-0434
PO BOX 435, IMPERIAL BEACH, CA 91933-0435
PO BOX 436, IMPERIAL BEACH, CA 91933-0436
PO BOX 437, IMPERIAL BEACH, CA 91933-0437
PO BOX 438, IMPERIAL BEACH, CA 91933-0438
PO BOX 439, IMPERIAL BEACH, CA 91933-0439
PO BOX 440, IMPERIAL BEACH, CA 91933-0440
PO BOX 441, IMPERIAL BEACH, CA 91933-0441
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