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 221, EL CENTRO, CA 92244-0221
PO BOX 222, EL CENTRO, CA 92244-0222
PO BOX 223, EL CENTRO, CA 92244-0223
PO BOX 224, EL CENTRO, CA 92244-0224
PO BOX 225, EL CENTRO, CA 92244-0225
PO BOX 226, EL CENTRO, CA 92244-0226
PO BOX 227, EL CENTRO, CA 92244-0227
PO BOX 228, EL CENTRO, CA 92244-0228
PO BOX 229, EL CENTRO, CA 92244-0229
PO BOX 230, EL CENTRO, CA 92244-0230
PO BOX 231, EL CENTRO, CA 92244-0231
PO BOX 232, EL CENTRO, CA 92244-0232
PO BOX 233, EL CENTRO, CA 92244-0233
PO BOX 234, EL CENTRO, CA 92244-0234
PO BOX 235, EL CENTRO, CA 92244-0235
PO BOX 236, EL CENTRO, CA 92244-0236
PO BOX 237, EL CENTRO, CA 92244-0237
PO BOX 238, EL CENTRO, CA 92244-0238
PO BOX 239, EL CENTRO, CA 92244-0239
PO BOX 240, EL CENTRO, CA 92244-0240
PO BOX 241, EL CENTRO, CA 92244-0241
PO BOX 242, EL CENTRO, CA 92244-0242
PO BOX 243, EL CENTRO, CA 92244-0243
PO BOX 244, EL CENTRO, CA 92244-0244
PO BOX 245, EL CENTRO, CA 92244-0245
PO BOX 246, EL CENTRO, CA 92244-0246
PO BOX 247, EL CENTRO, CA 92244-0247
PO BOX 248, EL CENTRO, CA 92244-0248
PO BOX 249, EL CENTRO, CA 92244-0249
PO BOX 250, EL CENTRO, CA 92244-0250
PO BOX 251, EL CENTRO, CA 92244-0251
PO BOX 252, EL CENTRO, CA 92244-0252
PO BOX 253, EL CENTRO, CA 92244-0253
PO BOX 254, EL CENTRO, CA 92244-0254
PO BOX 255, EL CENTRO, CA 92244-0255
PO BOX 256, EL CENTRO, CA 92244-0256
PO BOX 257, EL CENTRO, CA 92244-0257
PO BOX 258, EL CENTRO, CA 92244-0258
PO BOX 259, EL CENTRO, CA 92244-0259
PO BOX 260, EL CENTRO, CA 92244-0260
PO BOX 261, EL CENTRO, CA 92244-0261
PO BOX 262, EL CENTRO, CA 92244-0262
PO BOX 263, EL CENTRO, CA 92244-0263
PO BOX 264, EL CENTRO, CA 92244-0264
PO BOX 265, EL CENTRO, CA 92244-0265
PO BOX 266, EL CENTRO, CA 92244-0266
PO BOX 267, EL CENTRO, CA 92244-0267
PO BOX 268, EL CENTRO, CA 92244-0268
PO BOX 269, EL CENTRO, CA 92244-0269
PO BOX 270, EL CENTRO, CA 92244-0270
PO BOX 271, EL CENTRO, CA 92244-0271
PO BOX 272, EL CENTRO, CA 92244-0272
PO BOX 273, EL CENTRO, CA 92244-0273
PO BOX 274, EL CENTRO, CA 92244-0274
PO BOX 275, EL CENTRO, CA 92244-0275
PO BOX 276, EL CENTRO, CA 92244-0276
PO BOX 277, EL CENTRO, CA 92244-0277
PO BOX 278, EL CENTRO, CA 92244-0278
PO BOX 279, EL CENTRO, CA 92244-0279
PO BOX 280, EL CENTRO, CA 92244-0280
PO BOX 281, EL CENTRO, CA 92244-0281
PO BOX 282, EL CENTRO, CA 92244-0282
PO BOX 283, EL CENTRO, CA 92244-0283
PO BOX 284, EL CENTRO, CA 92244-0284
PO BOX 285, EL CENTRO, CA 92244-0285
PO BOX 286, EL CENTRO, CA 92244-0286
PO BOX 287, EL CENTRO, CA 92244-0287
PO BOX 288, EL CENTRO, CA 92244-0288
PO BOX 289, EL CENTRO, CA 92244-0289
PO BOX 290, EL CENTRO, CA 92244-0290
PO BOX 291, EL CENTRO, CA 92244-0291
PO BOX 292, EL CENTRO, CA 92244-0292
PO BOX 293, EL CENTRO, CA 92244-0293
PO BOX 294, EL CENTRO, CA 92244-0294
PO BOX 295, EL CENTRO, CA 92244-0295
PO BOX 296, EL CENTRO, CA 92244-0296
PO BOX 297, EL CENTRO, CA 92244-0297
PO BOX 298, EL CENTRO, CA 92244-0298
PO BOX 299, EL CENTRO, CA 92244-0299
PO BOX 300, EL CENTRO, CA 92244-0300
PO BOX 301, EL CENTRO, CA 92244-0301
PO BOX 302, EL CENTRO, CA 92244-0302
PO BOX 303, EL CENTRO, CA 92244-0303
PO BOX 304, EL CENTRO, CA 92244-0304
PO BOX 305, EL CENTRO, CA 92244-0305
PO BOX 306, EL CENTRO, CA 92244-0306
PO BOX 307, EL CENTRO, CA 92244-0307
PO BOX 308, EL CENTRO, CA 92244-0308
PO BOX 309, EL CENTRO, CA 92244-0309
PO BOX 310, EL CENTRO, CA 92244-0310
PO BOX 311, EL CENTRO, CA 92244-0311
PO BOX 312, EL CENTRO, CA 92244-0312
PO BOX 313, EL CENTRO, CA 92244-0313
PO BOX 314, EL CENTRO, CA 92244-0314
PO BOX 315, EL CENTRO, CA 92244-0315
PO BOX 316, EL CENTRO, CA 92244-0316
PO BOX 317, EL CENTRO, CA 92244-0317
PO BOX 318, EL CENTRO, CA 92244-0318
PO BOX 319, EL CENTRO, CA 92244-0319
PO BOX 320, EL CENTRO, CA 92244-0320
PO BOX 321, EL CENTRO, CA 92244-0321
PO BOX 322, EL CENTRO, CA 92244-0322
PO BOX 323, EL CENTRO, CA 92244-0323
PO BOX 324, EL CENTRO, CA 92244-0324
PO BOX 325, EL CENTRO, CA 92244-0325
PO BOX 326, EL CENTRO, CA 92244-0326
PO BOX 327, EL CENTRO, CA 92244-0327
PO BOX 328, EL CENTRO, CA 92244-0328
PO BOX 329, EL CENTRO, CA 92244-0329
PO BOX 330, EL CENTRO, CA 92244-0330
PO BOX 331, EL CENTRO, CA 92244-0331
PO BOX 332, EL CENTRO, CA 92244-0332
PO BOX 333, EL CENTRO, CA 92244-0333
PO BOX 334, EL CENTRO, CA 92244-0334
PO BOX 335, EL CENTRO, CA 92244-0335
PO BOX 336, EL CENTRO, CA 92244-0336
PO BOX 337, EL CENTRO, CA 92244-0337
PO BOX 338, EL CENTRO, CA 92244-0338
PO BOX 339, EL CENTRO, CA 92244-0339
PO BOX 340, EL CENTRO, CA 92244-0340
PO BOX 341, EL CENTRO, CA 92244-0341
PO BOX 342, EL CENTRO, CA 92244-0342
PO BOX 343, EL CENTRO, CA 92244-0343
PO BOX 344, EL CENTRO, CA 92244-0344
PO BOX 345, EL CENTRO, CA 92244-0345
PO BOX 346, EL CENTRO, CA 92244-0346
PO BOX 347, EL CENTRO, CA 92244-0347
PO BOX 348, EL CENTRO, CA 92244-0348
PO BOX 349, EL CENTRO, CA 92244-0349
PO BOX 350, EL CENTRO, CA 92244-0350
PO BOX 351, EL CENTRO, CA 92244-0351
PO BOX 352, EL CENTRO, CA 92244-0352
PO BOX 353, EL CENTRO, CA 92244-0353
PO BOX 354, EL CENTRO, CA 92244-0354
PO BOX 355, EL CENTRO, CA 92244-0355
PO BOX 356, EL CENTRO, CA 92244-0356
PO BOX 357, EL CENTRO, CA 92244-0357
PO BOX 358, EL CENTRO, CA 92244-0358
PO BOX 359, EL CENTRO, CA 92244-0359
PO BOX 360, EL CENTRO, CA 92244-0360
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