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, SOUTH PASADENA, CA 91031-0241
PO BOX 242, SOUTH PASADENA, CA 91031-0242
PO BOX 243, SOUTH PASADENA, CA 91031-0243
PO BOX 244, SOUTH PASADENA, CA 91031-0244
PO BOX 245, SOUTH PASADENA, CA 91031-0245
PO BOX 246, SOUTH PASADENA, CA 91031-0246
PO BOX 247, SOUTH PASADENA, CA 91031-0247
PO BOX 248, SOUTH PASADENA, CA 91031-0248
PO BOX 249, SOUTH PASADENA, CA 91031-0249
PO BOX 250, SOUTH PASADENA, CA 91031-0250
PO BOX 251, SOUTH PASADENA, CA 91031-0251
PO BOX 252, SOUTH PASADENA, CA 91031-0252
PO BOX 253, SOUTH PASADENA, CA 91031-0253
PO BOX 254, SOUTH PASADENA, CA 91031-0254
PO BOX 255, SOUTH PASADENA, CA 91031-0255
PO BOX 256, SOUTH PASADENA, CA 91031-0256
PO BOX 257, SOUTH PASADENA, CA 91031-0257
PO BOX 258, SOUTH PASADENA, CA 91031-0258
PO BOX 259, SOUTH PASADENA, CA 91031-0259
PO BOX 260, SOUTH PASADENA, CA 91031-0260
PO BOX 261, SOUTH PASADENA, CA 91031-0261
PO BOX 262, SOUTH PASADENA, CA 91031-0262
PO BOX 263, SOUTH PASADENA, CA 91031-0263
PO BOX 264, SOUTH PASADENA, CA 91031-0264
PO BOX 265, SOUTH PASADENA, CA 91031-0265
PO BOX 266, SOUTH PASADENA, CA 91031-0266
PO BOX 267, SOUTH PASADENA, CA 91031-0267
PO BOX 268, SOUTH PASADENA, CA 91031-0268
PO BOX 269, SOUTH PASADENA, CA 91031-0269
PO BOX 270, SOUTH PASADENA, CA 91031-0270
PO BOX 271, SOUTH PASADENA, CA 91031-0271
PO BOX 272, SOUTH PASADENA, CA 91031-0272
PO BOX 273, SOUTH PASADENA, CA 91031-0273
PO BOX 274, SOUTH PASADENA, CA 91031-0274
PO BOX 275, SOUTH PASADENA, CA 91031-0275
PO BOX 276, SOUTH PASADENA, CA 91031-0276
PO BOX 277, SOUTH PASADENA, CA 91031-0277
PO BOX 278, SOUTH PASADENA, CA 91031-0278
PO BOX 279, SOUTH PASADENA, CA 91031-0279
PO BOX 280, SOUTH PASADENA, CA 91031-0280
PO BOX 281, SOUTH PASADENA, CA 91031-0281
PO BOX 282, SOUTH PASADENA, CA 91031-0282
PO BOX 283, SOUTH PASADENA, CA 91031-0283
PO BOX 284, SOUTH PASADENA, CA 91031-0284
PO BOX 285, SOUTH PASADENA, CA 91031-0285
PO BOX 286, SOUTH PASADENA, CA 91031-0286
PO BOX 287, SOUTH PASADENA, CA 91031-0287
PO BOX 288, SOUTH PASADENA, CA 91031-0288
PO BOX 289, SOUTH PASADENA, CA 91031-0289
PO BOX 290, SOUTH PASADENA, CA 91031-0290
PO BOX 291, SOUTH PASADENA, CA 91031-0291
PO BOX 292, SOUTH PASADENA, CA 91031-0292
PO BOX 293, SOUTH PASADENA, CA 91031-0293
PO BOX 294, SOUTH PASADENA, CA 91031-0294
PO BOX 295, SOUTH PASADENA, CA 91031-0295
PO BOX 296, SOUTH PASADENA, CA 91031-0296
PO BOX 297, SOUTH PASADENA, CA 91031-0297
PO BOX 298, SOUTH PASADENA, CA 91031-0298
PO BOX 299, SOUTH PASADENA, CA 91031-0299
PO BOX 300, SOUTH PASADENA, CA 91031-0300
PO BOX 301, SOUTH PASADENA, CA 91031-0301
PO BOX 302, SOUTH PASADENA, CA 91031-0302
PO BOX 303, SOUTH PASADENA, CA 91031-0303
PO BOX 304, SOUTH PASADENA, CA 91031-0304
PO BOX 305, SOUTH PASADENA, CA 91031-0305
PO BOX 306, SOUTH PASADENA, CA 91031-0306
PO BOX 307, SOUTH PASADENA, CA 91031-0307
PO BOX 308, SOUTH PASADENA, CA 91031-0308
PO BOX 309, SOUTH PASADENA, CA 91031-0309
PO BOX 310, SOUTH PASADENA, CA 91031-0310
PO BOX 311, SOUTH PASADENA, CA 91031-0311
PO BOX 312, SOUTH PASADENA, CA 91031-0312
PO BOX 313, SOUTH PASADENA, CA 91031-0313
PO BOX 314, SOUTH PASADENA, CA 91031-0314
PO BOX 315, SOUTH PASADENA, CA 91031-0315
PO BOX 316, SOUTH PASADENA, CA 91031-0316
PO BOX 317, SOUTH PASADENA, CA 91031-0317
PO BOX 318, SOUTH PASADENA, CA 91031-0318
PO BOX 319, SOUTH PASADENA, CA 91031-0319
PO BOX 320, SOUTH PASADENA, CA 91031-0320
PO BOX 321, SOUTH PASADENA, CA 91031-0321
PO BOX 322, SOUTH PASADENA, CA 91031-0322
PO BOX 323, SOUTH PASADENA, CA 91031-0323
PO BOX 324, SOUTH PASADENA, CA 91031-0324
PO BOX 325, SOUTH PASADENA, CA 91031-0325
PO BOX 326, SOUTH PASADENA, CA 91031-0326
PO BOX 327, SOUTH PASADENA, CA 91031-0327
PO BOX 328, SOUTH PASADENA, CA 91031-0328
PO BOX 329, SOUTH PASADENA, CA 91031-0329
PO BOX 330, SOUTH PASADENA, CA 91031-0330
PO BOX 331, SOUTH PASADENA, CA 91031-0331
PO BOX 332, SOUTH PASADENA, CA 91031-0332
PO BOX 333, SOUTH PASADENA, CA 91031-0333
PO BOX 334, SOUTH PASADENA, CA 91031-0334
PO BOX 335, SOUTH PASADENA, CA 91031-0335
PO BOX 336, SOUTH PASADENA, CA 91031-0336
PO BOX 337, SOUTH PASADENA, CA 91031-0337
PO BOX 338, SOUTH PASADENA, CA 91031-0338
PO BOX 339, SOUTH PASADENA, CA 91031-0339
PO BOX 340, SOUTH PASADENA, CA 91031-0340
PO BOX 341, SOUTH PASADENA, CA 91031-0341
PO BOX 342, SOUTH PASADENA, CA 91031-0342
PO BOX 343, SOUTH PASADENA, CA 91031-0343
PO BOX 344, SOUTH PASADENA, CA 91031-0344
PO BOX 345, SOUTH PASADENA, CA 91031-0345
PO BOX 346, SOUTH PASADENA, CA 91031-0346
PO BOX 347, SOUTH PASADENA, CA 91031-0347
PO BOX 348, SOUTH PASADENA, CA 91031-0348
PO BOX 349, SOUTH PASADENA, CA 91031-0349
PO BOX 350, SOUTH PASADENA, CA 91031-0350
PO BOX 351, SOUTH PASADENA, CA 91031-0351
PO BOX 352, SOUTH PASADENA, CA 91031-0352
PO BOX 353, SOUTH PASADENA, CA 91031-0353
PO BOX 354, SOUTH PASADENA, CA 91031-0354
PO BOX 355, SOUTH PASADENA, CA 91031-0355
PO BOX 356, SOUTH PASADENA, CA 91031-0356
PO BOX 357, SOUTH PASADENA, CA 91031-0357
PO BOX 358, SOUTH PASADENA, CA 91031-0358
PO BOX 359, SOUTH PASADENA, CA 91031-0359
PO BOX 360, SOUTH PASADENA, CA 91031-0360
PO BOX 361, SOUTH PASADENA, CA 91031-0361
PO BOX 362, SOUTH PASADENA, CA 91031-0362
PO BOX 363, SOUTH PASADENA, CA 91031-0363
PO BOX 364, SOUTH PASADENA, CA 91031-0364
PO BOX 365, SOUTH PASADENA, CA 91031-0365
PO BOX 366, SOUTH PASADENA, CA 91031-0366
PO BOX 367, SOUTH PASADENA, CA 91031-0367
PO BOX 368, SOUTH PASADENA, CA 91031-0368
PO BOX 369, SOUTH PASADENA, CA 91031-0369
PO BOX 370, SOUTH PASADENA, CA 91031-0370
PO BOX 371, SOUTH PASADENA, CA 91031-0371
PO BOX 372, SOUTH PASADENA, CA 91031-0372
PO BOX 373, SOUTH PASADENA, CA 91031-0373
PO BOX 374, SOUTH PASADENA, CA 91031-0374
PO BOX 375, SOUTH PASADENA, CA 91031-0375
PO BOX 376, SOUTH PASADENA, CA 91031-0376
PO BOX 377, SOUTH PASADENA, CA 91031-0377
PO BOX 378, SOUTH PASADENA, CA 91031-0378
PO BOX 379, SOUTH PASADENA, CA 91031-0379
PO BOX 380, SOUTH PASADENA, CA 91031-0380
PO BOX 381, SOUTH PASADENA, CA 91031-0381
PO BOX 382, SOUTH PASADENA, CA 91031-0382
PO BOX 383, SOUTH PASADENA, CA 91031-0383
PO BOX 384, SOUTH PASADENA, CA 91031-0384
PO BOX 385, SOUTH PASADENA, CA 91031-0385
PO BOX 386, SOUTH PASADENA, CA 91031-0386
PO BOX 387, SOUTH PASADENA, CA 91031-0387
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