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 301, BRIDGEPORT, CA 93517-0301
PO BOX 302, BRIDGEPORT, CA 93517-0302
PO BOX 303, BRIDGEPORT, CA 93517-0303
PO BOX 304, BRIDGEPORT, CA 93517-0304
PO BOX 305, BRIDGEPORT, CA 93517-0305
PO BOX 306, BRIDGEPORT, CA 93517-0306
PO BOX 307, BRIDGEPORT, CA 93517-0307
PO BOX 308, BRIDGEPORT, CA 93517-0308
PO BOX 309, BRIDGEPORT, CA 93517-0309
PO BOX 310, BRIDGEPORT, CA 93517-0310
PO BOX 311, BRIDGEPORT, CA 93517-0311
PO BOX 312, BRIDGEPORT, CA 93517-0312
PO BOX 313, BRIDGEPORT, CA 93517-0313
PO BOX 314, BRIDGEPORT, CA 93517-0314
PO BOX 315, BRIDGEPORT, CA 93517-0315
PO BOX 316, BRIDGEPORT, CA 93517-0316
PO BOX 317, BRIDGEPORT, CA 93517-0317
PO BOX 318, BRIDGEPORT, CA 93517-0318
PO BOX 319, BRIDGEPORT, CA 93517-0319
PO BOX 320, BRIDGEPORT, CA 93517-0320
PO BOX 321, BRIDGEPORT, CA 93517-0321
PO BOX 322, BRIDGEPORT, CA 93517-0322
PO BOX 323, BRIDGEPORT, CA 93517-0323
PO BOX 324, BRIDGEPORT, CA 93517-0324
PO BOX 325, BRIDGEPORT, CA 93517-0325
PO BOX 326, BRIDGEPORT, CA 93517-0326
PO BOX 327, BRIDGEPORT, CA 93517-0327
PO BOX 328, BRIDGEPORT, CA 93517-0328
PO BOX 329, BRIDGEPORT, CA 93517-0329
PO BOX 330, BRIDGEPORT, CA 93517-0330
PO BOX 331, BRIDGEPORT, CA 93517-0331
PO BOX 332, BRIDGEPORT, CA 93517-0332
PO BOX 333, BRIDGEPORT, CA 93517-0333
PO BOX 334, BRIDGEPORT, CA 93517-0334
PO BOX 335, BRIDGEPORT, CA 93517-0335
PO BOX 336, BRIDGEPORT, CA 93517-0336
PO BOX 337, BRIDGEPORT, CA 93517-0337
PO BOX 338, BRIDGEPORT, CA 93517-0338
PO BOX 339, BRIDGEPORT, CA 93517-0339
PO BOX 340, BRIDGEPORT, CA 93517-0340
PO BOX 341, BRIDGEPORT, CA 93517-0341
PO BOX 342, BRIDGEPORT, CA 93517-0342
PO BOX 343, BRIDGEPORT, CA 93517-0343
PO BOX 344, BRIDGEPORT, CA 93517-0344
PO BOX 345, BRIDGEPORT, CA 93517-0345
PO BOX 346, BRIDGEPORT, CA 93517-0346
PO BOX 347, BRIDGEPORT, CA 93517-0347
PO BOX 348, BRIDGEPORT, CA 93517-0348
PO BOX 349, BRIDGEPORT, CA 93517-0349
PO BOX 350, BRIDGEPORT, CA 93517-0350
PO BOX 351, BRIDGEPORT, CA 93517-0351
PO BOX 352, BRIDGEPORT, CA 93517-0352
PO BOX 353, BRIDGEPORT, CA 93517-0353
PO BOX 354, BRIDGEPORT, CA 93517-0354
PO BOX 355, BRIDGEPORT, CA 93517-0355
PO BOX 356, BRIDGEPORT, CA 93517-0356
PO BOX 357, BRIDGEPORT, CA 93517-0357
PO BOX 358, BRIDGEPORT, CA 93517-0358
PO BOX 359, BRIDGEPORT, CA 93517-0359
PO BOX 360, BRIDGEPORT, CA 93517-0360
PO BOX 361, BRIDGEPORT, CA 93517-0361
PO BOX 362, BRIDGEPORT, CA 93517-0362
PO BOX 363, BRIDGEPORT, CA 93517-0363
PO BOX 364, BRIDGEPORT, CA 93517-0364
PO BOX 365, BRIDGEPORT, CA 93517-0365
PO BOX 366, BRIDGEPORT, CA 93517-0366
PO BOX 367, BRIDGEPORT, CA 93517-0367
PO BOX 368, BRIDGEPORT, CA 93517-0368
PO BOX 369, BRIDGEPORT, CA 93517-0369
PO BOX 370, BRIDGEPORT, CA 93517-0370
PO BOX 371, BRIDGEPORT, CA 93517-0371
PO BOX 372, BRIDGEPORT, CA 93517-0372
PO BOX 373, BRIDGEPORT, CA 93517-0373
PO BOX 374, BRIDGEPORT, CA 93517-0374
PO BOX 375, BRIDGEPORT, CA 93517-0375
PO BOX 376, BRIDGEPORT, CA 93517-0376
PO BOX 377, BRIDGEPORT, CA 93517-0377
PO BOX 378, BRIDGEPORT, CA 93517-0378
PO BOX 379, BRIDGEPORT, CA 93517-0379
PO BOX 380, BRIDGEPORT, CA 93517-0380
PO BOX 381, BRIDGEPORT, CA 93517-0381
PO BOX 382, BRIDGEPORT, CA 93517-0382
PO BOX 383, BRIDGEPORT, CA 93517-0383
PO BOX 384, BRIDGEPORT, CA 93517-0384
PO BOX 385, BRIDGEPORT, CA 93517-0385
PO BOX 386, BRIDGEPORT, CA 93517-0386
PO BOX 387, BRIDGEPORT, CA 93517-0387
PO BOX 388, BRIDGEPORT, CA 93517-0388
PO BOX 389, BRIDGEPORT, CA 93517-0389
PO BOX 390, BRIDGEPORT, CA 93517-0390
PO BOX 391, BRIDGEPORT, CA 93517-0391
PO BOX 392, BRIDGEPORT, CA 93517-0392
PO BOX 393, BRIDGEPORT, CA 93517-0393
PO BOX 394, BRIDGEPORT, CA 93517-0394
PO BOX 395, BRIDGEPORT, CA 93517-0395
PO BOX 396, BRIDGEPORT, CA 93517-0396
PO BOX 397, BRIDGEPORT, CA 93517-0397
PO BOX 398, BRIDGEPORT, CA 93517-0398
PO BOX 399, BRIDGEPORT, CA 93517-0399
PO BOX 400, BRIDGEPORT, CA 93517-0400
PO BOX 401, BRIDGEPORT, CA 93517-0401
PO BOX 402, BRIDGEPORT, CA 93517-0402
PO BOX 403, BRIDGEPORT, CA 93517-0403
PO BOX 404, BRIDGEPORT, CA 93517-0404
PO BOX 405, BRIDGEPORT, CA 93517-0405
PO BOX 406, BRIDGEPORT, CA 93517-0406
PO BOX 407, BRIDGEPORT, CA 93517-0407
PO BOX 408, BRIDGEPORT, CA 93517-0408
PO BOX 409, BRIDGEPORT, CA 93517-0409
PO BOX 410, BRIDGEPORT, CA 93517-0410
PO BOX 411, BRIDGEPORT, CA 93517-0411
PO BOX 412, BRIDGEPORT, CA 93517-0412
PO BOX 413, BRIDGEPORT, CA 93517-0413
PO BOX 414, BRIDGEPORT, CA 93517-0414
PO BOX 415, BRIDGEPORT, CA 93517-0415
PO BOX 416, BRIDGEPORT, CA 93517-0416
PO BOX 417, BRIDGEPORT, CA 93517-0417
PO BOX 418, BRIDGEPORT, CA 93517-0418
PO BOX 419, BRIDGEPORT, CA 93517-0419
PO BOX 420, BRIDGEPORT, CA 93517-0420
PO BOX 421, BRIDGEPORT, CA 93517-0421
PO BOX 422, BRIDGEPORT, CA 93517-0422
PO BOX 423, BRIDGEPORT, CA 93517-0423
PO BOX 424, BRIDGEPORT, CA 93517-0424
PO BOX 425, BRIDGEPORT, CA 93517-0425
PO BOX 426, BRIDGEPORT, CA 93517-0426
PO BOX 427, BRIDGEPORT, CA 93517-0427
PO BOX 428, BRIDGEPORT, CA 93517-0428
PO BOX 429, BRIDGEPORT, CA 93517-0429
PO BOX 430, BRIDGEPORT, CA 93517-0430
PO BOX 431, BRIDGEPORT, CA 93517-0431
PO BOX 432, BRIDGEPORT, CA 93517-0432
PO BOX 433, BRIDGEPORT, CA 93517-0433
PO BOX 434, BRIDGEPORT, CA 93517-0434
PO BOX 435, BRIDGEPORT, CA 93517-0435
PO BOX 436, BRIDGEPORT, CA 93517-0436
PO BOX 437, BRIDGEPORT, CA 93517-0437
PO BOX 438, BRIDGEPORT, CA 93517-0438
PO BOX 439, BRIDGEPORT, CA 93517-0439
PO BOX 440, BRIDGEPORT, CA 93517-0440
PO BOX 441, BRIDGEPORT, CA 93517-0441
PO BOX 442, BRIDGEPORT, CA 93517-0442
PO BOX 443, BRIDGEPORT, CA 93517-0443
PO BOX 444, BRIDGEPORT, CA 93517-0444
PO BOX 445, BRIDGEPORT, CA 93517-0445
PO BOX 446, BRIDGEPORT, CA 93517-0446
PO BOX 447, BRIDGEPORT, CA 93517-0447
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